TY - CONF
A1 - Bäßler, Ralph
A1 - Keserović, A.
A1 - Sobetzki, J.
A1 - Sarmiento-Klapper, H.
A1 - Boduch, A.
A1 - Aristia, G.
A1 - Faes, W.
A1 - Stoljarova, A.
A1 - Zimmer, S.
T1 - Metallene Werkstoffe in Geothermieanlagen - nicht nur aus Sicht der Korrosion
N2 - Um Konstrukteuren und Nutzern geothermischer Anlagen grundlegende Informationen über die Korrosionsbeständigkeit zur Verfügung zu stellen, wurden verschiedene metallene Werkstoffe, darunter nichtrostende Duplex- und austenitische Stähle sowie eine Nickellegierung, in künstlichen Geothermalwässern, die die Bedingungen an verschiedenen Standorten mit geothermischem Potenzial simulieren, mit Hilfe von elektrochemischen und Langzeittests hinsichtlich ihrer Eignung bewertet.
In hochsalinaren Umgebungen erwies sich Spaltkorrosion als der entscheidende Mechanismus. Die Nickellegierung zeigt eine ausgezeichnete Beständigkeit gegenüber Lochkorrosion. Abgesehen von ihren hohen Kosten eignet sie sich sehr gut für den Bau von Geothermieanlagen mit stark salzhaltigen Fluiden. Rostfreie Stähle und Duplexstähle weisen eine begrenzte Korrosionsbeständigkeit gegen Loch- und Spaltkorrosion auf. Daher sind sie für stark salzhaltige Fluide nicht geeignet. Der Superaustenit zeigt ein temperaturabhängiges Verhalten. In nichtsalinaren Umgebungen könnten niedriglegierte Stähle (neben den höherlegierten Werkstoffen) als Konstruktionsmaterial für Geothermieanlagen eingesetzt werden, sofern eine ausreichende Wandstärke des Materials berücksichtigt wird.
Neben Korrosionsaspekten erwies sich auch die Ausfällung von Fluidbestandteilen als interessantes Thema. Beim Betrieb der Forschungsanlage in Groß Schönebeck wurden Kupfer- und Bleieffekte im Bohrloch festgestellt. Die auftretenden Mechanismen und Maßnahmen zur Verhinderung von Ausfällungen und Abscheidungen wurden ebenso untersucht, wie deren mögliche Einflüsse auf die Korrosionsbeständigkeit metallener Werkstoffe für Anlagenkomponenten.
Der Beitrag beschreibt die Wechselwirkungen zwischen Geothermalwässern und Ausrüstungskomponenten.
T2 - 57. Kraftwerktechnisches Kolloquium
CY - Dresden, Germany
DA - 07.10.2025
KW - Örtliche Korrosion
KW - Edelstahl
KW - Ni-Legierungen
KW - Geothermie
KW - Abscheidung
PY - 2025
SN - 978-3-00-082651-1
SN - 978-3-00-082652-8
SP - 551
EP - 568
PB - IKS-Verlag
CY - Freiberg
AN - OPUS4-64320
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Yao, Xingyu
A1 - Antunes, Margarida M.
A1 - Guilherme Buzanich, Ana
A1 - Cabanelas, Pedro
A1 - Valente, Anabela A.
A1 - Pinna, Nicola
A1 - Russo, Patrícia A.
T1 - Formation, Phase Transition, Surface, and Catalytic Properties of Cubic ZrO 2 Nanocrystals
N2 - Pseudocapacitance-type transition metal oxides have been extensively investigated as anodes for lithium-ion batteries (LIBs). Currently, they are also gaining attention for sodium-ion batteries (SIBs) due to their low volume change and safety. However, their performance in sodium storage remains limited, primarily due to the larger Na+ ion radius. Here, for the first time, an iron niobate is reported with a columbite structure as a high-Performance sodium storage anode. The presence of iron triggers the loss of long-rangeorder through disorder of the FeO6 octahedra local structure, subsequentlyallowing reversible sodium storage in an amorphous phase. Simultaneously, the formation of short-range ordered zigzag-chain structures within the NbO6 planes creates a “skeleton” that offers abundant active sites forpseudocapacitive ion storage and enhanced ion diffusion pathways. These characteristics of FeNb2O6 make it an effective intercalation host, offering high capacity along with fast Na+ kinetics, as demonstrated through operando and ex situ characterizations. It leads to an applicable reversible capacity (>300 mAh g−1) with a favorable average voltage of ≈0.6 V and excellent rate capability (180.4 mAh g−1 at a current density of 2 A g−1). This study provides insights into the development of intrinsically active transition metal oxides for Na+-ion intercalation.
KW - XAS
KW - Sodium-ion Batteries
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654955
DO - https://doi.org/10.1021/acs.chemmater.5c01483
SN - 0897-4756
VL - 37
IS - 21
SP - 8568
EP - 8580
PB - American Chemical Society (ACS)
AN - OPUS4-65495
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Faustino, Leandro A.
A1 - de Angelis, Leonardo D.
A1 - de Melo, Eduardo C.
A1 - Farias, Giliandro
A1 - dos Santos, Egon C.
A1 - Miranda, Caetano R.
A1 - Buzanich, Ana G.
A1 - Torresi, Roberto M.
A1 - de Oliveira, Paulo F.M.
A1 - Córdoba de Torresi, Susana I.
T1 - Urea synthesis by Plasmon-Assisted N2 and CO2 co-electrolysis onto heterojunctions decorated with silver nanoparticles
N2 - The N2 + CO2 co-electrolysis to urea synthesis has become a promising alternative to the energy intensive traditional processes for urea production. However, there are still challenges in this approach, especially due to the competition with HER (Hydrogen Evolution Reaction) leading to low efficiency. Electrochemistry assisted by localized surface plasmon resonance (LSPR) using metal nanoparticles has been reported to enhance different electrochemical reactions. Here we report an electrochemical LSPR assisted urea synthesis using Ag nanoparticles (NPs) supported on BiVO4/BiFeO3 catalyst mechanochemically synthesized. The electrochemical experiments were performed under dark and upon plasmon excitation at the LSPR region of Ag NPs. Our results demonstrated that exciting in the LSPR range, urea yield rate and Faradic efficiency were considerably improved with reduced overpotential, 19.2 μmol h− 1 g− 1 and FE 24.4% at +0.1 V vs RHE compared to 9.6 μmol h− 1 g− 1 and FE 9.4% at − 0.2 V vs RHE under dark conditions. Further in situ FTIR-RAS experiments for mechanism investigation revealed the presence of N-H and C-N intermediates and the real effect of Ag plasmon excitation on HER and N2 + CO2 co-electrolysis. Theoretical calculations confirm the energy of the species involved in C-N coupling as well the role of the complex catalytic sites, which agrees with XAS measurements.
KW - Plasmon-assited
KW - XAS
KW - Urea
KW - Electrocatalysis
PY - 2025
DO - https://doi.org/10.1016/j.cej.2025.163072
SN - 1385-8947
VL - 513
SP - 1
EP - 13
PB - Elsevier B.V.
AN - OPUS4-65492
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Liu, Yanchen
A1 - Guilherme Buzanich, Ana
A1 - Alippi, Paola
A1 - Montoro, Luciano A.
A1 - Lee, Kug‐Seung
A1 - Jeon, Taeyeol
A1 - Weißer, Kilian
A1 - Karlsen, Martin A.
A1 - Russo, Patrícia A.
A1 - Pinna, Nicola
T1 - FeNb 2 O 6 as a High‐Performance Anode for Sodium‐Ion Batteries Enabled by Structural Amorphization Coupled with NbO 6 Local Ordering
N2 - Pseudocapacitance-type transition metal oxides have been extensively investigated as anodes for lithium-ion batteries (LIBs). Currently, they are also gaining attention for sodium-ion batteries (SIBs) due to their low volume change and safety. However, their performance in sodium storage remains limited, primarily due to the larger Na+ ion radius. Here, for the first time, an iron niobate is reported with a columbite structure as a high-performance sodium storage anode. The presence of iron triggers the loss of long-range order through disorder of the FeO6 octahedra local structure, subsequently allowing reversible sodium storage in an amorphous phase. Simultaneously, the formation of short-range ordered zigzag-chain structures within the NbO6 planes creates a “skeleton” that offers abundant active sites for pseudocapacitive ion storage and enhanced ion diffusion pathways. These characteristics of FeNb2O6 make it an effective intercalation host, offering high capacity along with fast Na+ kinetics, as demonstrated through operando and ex situ characterizations. It leads to an applicable reversible capacity (>300 mAh g−1) with a favorable average voltage of ≈0.6 V and excellent rate capability (180.4 mAh g−1 at a current density of 2 A g−1). This study provides insights into the development of intrinsically active transition metal oxides for Na+-ion intercalation.
KW - SIB
KW - XAS
KW - Sodium-ion Batteries
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654931
DO - https://doi.org/10.1002/adma.202504100
SN - 0935-9648
VL - 37
IS - 46
SP - 1
EP - 13
PB - Wiley
AN - OPUS4-65493
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Low, Jian Liang
T1 - 理论模拟与实验协同的材料表征与机理研究
T1 - Integrating modelling and experiment for synergistic material characterization and mechanism studies
N2 - In this academic salon among Chinese-speaking researchers within Germany and EU, I presented my work on utilizing computational chemistry to support experimental characterization and mechanism studies. The discussion focused on metal- and nitrogen-doped carbon (M-N-Cs) with well-defined coordination geometry as an excellent reference material for synergistic theory-experimental research. Some key topics included the analysis of structural preferences of imprinting ions, spectroscopic characterization of specific active sites and mechanism studies pertaining oxygen reduction reaction and hydrogen peroxide chemistry at these active sites.
T2 - 21st Koushare Workshop - European Materials Science: From Molecular Design to Material Applications
CY - Berlin, Germany
DA - 25.10.2025
KW - Metal- and Nitrogen Doped Carbon (M-N-C)
KW - Active Site Characterization
KW - Electrochemical mechanisms
KW - Oxygen Reduction Reaction (ORR)
PY - 2025
AN - OPUS4-65152
LA - zho
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Habibimarkani, Heydar
A1 - Prinz, Carsten
A1 - Sahre, Mario
A1 - Hodoroaba, Vasile-Dan
A1 - Radnik, Jörg
T1 - CV, TEM, XRD and XPS/HAXPES datasets of FeNi-based nanoparticles for the oxygen evolution reaction
N2 - The datasets from Cyclic Voltammetry, Transmision Electron Microscopy, X-ray Diffraction, and (Hard Energy) X-ray Photoelectron Spectroscopy are related to the publication
H. Habibimarkani, S.-L. Abram, A. Guilherme Buzanich, C. Prinz, M. Sahre, V.-D. Hodoroaba and J. Radnik
"In-depth analysis of FeNi-based nanoparticles for the oxygen evolution reaction"
Scientific Reports (2025), https://doi.org/10.1038/s41598-025-92720-3
Details of the materials and the experimental procedures are described in this publications.
KW - Oxygen evolution reaction
KW - Fe-Ni nanopartices
KW - Comprehensive analysis
PY - 2025
DO - https://doi.org/10.5281/zenodo.14975964
PB - Zenodo
CY - Geneva
AN - OPUS4-63335
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Gong, Mengjun
A1 - Mehmood, Asad
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Fellinger, Tim-Patrick
A1 - Jackson, Colleen
A1 - Cui, Junyi
A1 - Drazic, Goran
A1 - Kucernak, Anthony
T1 - Designing Co–N/C Cathode Catalysts with Dense Atomic Cobalt Sites for Enhanced PEMFC Performance
N2 - Metal-nitrogen/carbon (M-N/C) catalysts, particularly those incorporating Fe,Co, or Mn, are among the most promising non-platinum group catalysts forthe acidic oxygen reduction reaction (ORR) in fuel cells. This study reports aCo-N/C catalyst featuring high (3 wt%) cobalt content exclusively present asatomic sites. Extended X-ray absorption fine structure analysis confirms atetrapyridinic Co-N4 coordination environment in the optimized (3.0)Co-N/C𝚫catalyst. The high cobalt loading leads to a significant density ofelectrochemically accessible active sites, 3.58 × 10 19 sites g−1 , quantified viathe nitrite stripping method. The catalyst demonstrates excellent ORR activityin a rotating ring-disk electrode setup, achieving a half-wave potential (E 1/2 ) of0.76 V at a low loading of 0.2 mg cm−2 and a mass activity of 3.5 A g−1 at 0.80VRHE . Single-cell hydrogen-oxygen PEMFC tests achieve a peak power densityexceeding 1.3 W cm−2 (iR-corrected). Under hydrogen-air condition, thecatalyst delivers 0.54 A cm−2 at 0.60 V (0.39 W cm−2 ). Despite the intrinsicallyhigher turnover frequency of Fe-based sites, the optimized(3.0)Co-N/C𝚫 catalyst achieves similar fuel cell performance to that of Fe-N/C,highlighting the critical role of site density in overall activity.
KW - Fuel cells
KW - Single atom catalysts
KW - Oxygen reduction reaction
KW - Non-precious catalysts
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-644276
DO - https://doi.org/10.1002/advs.202516060
SN - 2198-3844
SP - 1
EP - 11
PB - Wiley VHC-Verlag
AN - OPUS4-64427
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - INPR
A1 - Rieck, Arielle
A1 - Low, Jian Liang
A1 - Dietzmann, Simon
A1 - Radnik, Jörg
A1 - Teimouri, Zahra
A1 - Higgins, Drew
A1 - Hodoroaba, Vasile-Dan
A1 - Mehmood, Asad
A1 - Fellinger, Tim-Patrick
T1 - Understanding the Activity Trade-Off between Tetrapyrrolic Fe-NCs and Co-NCs in the Alkaline Oxygen Reduction Reaction
N2 - A water-free ionothermal synthesis of porous magnesium-imprinted nitrogen-doped carbon (Mg–NC) materials is introduced to prepare a platform material to investigate electrocatalytic structure-performance relations. Atomically dispersed Co- and Fe-NCs isomorphic to the pristine Mg-NCs are prepared by ion-exchange reactions. The current Mg-templating strategy enables relatively high pyrolysis product yields of up to 50 wt% and resultant Fe-NC and Co-NC catalysts contain high and comparable active metal loading of up to 2.52 wt% Fe and 2.29 wt% Co, respectively. A combination of X-ray spectroscopies with DFT studies reveals a tetrapyrrolic structure of the coordination sites, originating from a pyrolytic magnesium template ion reaction within the ionothermal synthesis. Two sets of highly active isomorphic tetrapyrrolic Fe-NCs and Co-NCs are utilized to understand the differences in intrinsic electrocatalytic performance of Co-NCs and Fe-NCs towards the alkaline oxygen reduction reaction (ORR). Despite their superior valence electronic properties to facilitate the initial outer-sphere electron transfer to O2, Co-NCs show significantly lower performance than Fe-NC with comparable loading. Although the generally discussed weaker binding of peroxide intermediates to CoN4 sites compared to FeN4 sites is evident, experimental and theoretical investigation reveal that it is the underlying peroxide oxidation activity that suppresses the oxygen reduction activity of M-NCs. The high peroxide oxidation activity of Co-NCs explains their reduced alkaline ORR relative to Fe-NCs, shedding light on the understated significance of controlling peroxide chemistry for the optimizing cathodic performance.
KW - Magnesium Imprinting
KW - Tetrapyrrolic Sites
KW - Metal- and nitrogen-doped carbon (M-N-C)
KW - Oxygen Reduction Reaction (ORR)
KW - Nitrogen doped Carbon
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-651487
DO - https://doi.org/10.26434/chemrxiv-2025-s59s5
SP - 1
EP - 24
AN - OPUS4-65148
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Böttcher, Nils
A1 - Sander, Luise
A1 - Ulbricht, Alexander
A1 - Widjaja, Martinus Putra
A1 - Fellinger, Tim-Patrick
A1 - Schmidt, Anita
A1 - Krug von Nidda, Jonas
T1 - Sodium-ion battery research @ BAM (I): investigating the thermal runaway behaviour of commercial sodium-ion battery cells
N2 - Commercially available sodium-ion battery (SIB) cells, with energy densities comparable to lithium-ion battery (LIB) cells based on LiFePO4, were investigated regarding their safety behaviour under thermal abuse conditions. Tests were carried out in an inert atmosphere. The SIB-cells went into thermal runaway (TR), intriguingly, even at a rather low state of charge of 30%. The TR-event was coupled with a pronounced jelly roll ejection, challenging the interpretation of the TR-diagrams. These findings highlight the necessity of incorporating SIB-cells into the ongoing safety classification discussions for LIB-cells.
KW - Sodium Ion Batteries
KW - Thermal Runaway
KW - Battery safety
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-647652
DO - https://doi.org/10.1039/d5se00687b
SN - 2398-4902
VL - 9
IS - 21
SP - 5832
EP - 5838
PB - Royal Society of Chemistry (RSC)
AN - OPUS4-64765
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Wu, Shu-Han
T1 - Exploring Sodium Ion Storage: Combining a MOF Derived Carbon Core with a Sieving Carbon Shell to Illuminate Adsorptive Site Influences
N2 - Unlike lithium-ion batteries (LIBs) where crystalline graphite is commonly used as the negative electrode material, disordered carbons are regarded as more promising forsodium-ion batteries (SIBs). However, further advances towards better reversibility and higher specific capacity are still needed to match or even exceed the properties of graphite in LIBs. The main challenge is the complex and unpredictable Na+ storage mechanism in disordered carbons. [1] Method: Recently, Matsukawa et al. have reported that the reversibility of (de)sodiation processes of disordered carbons is better for ultra microporous carbons.[2] Ultra micropores are accessible only to Na+ ions and not to solvent molecules. Therefore, the ultra micopores can be used for Na-storage, however, do not significantly contribute to side reactions caused by solid-electrolyte interphase (SEI) formation, which reduces the related irreversible capacity loss. Building on this concept, the origins of specific capacity and irreversible losses were further explored by modifying the chemical composition of zeolitic imidazolate framework (ZIF-8) derived carbons, while maintaining comparable porosity. This involved adjusting the nitrogen content through temperature variation. Additionally, these ZIF-8 derived carbons were enhanced with a protective ion sieving carbon shell formed by chemical vapor deposition. This shell enables effective distinction between reversible and irreversible Na+ storage. Results: The tailor-made core-shell carbons with higher nitrogen content demonstrate greater capacity in the sloping region, but lower capacity in the plateau region of the voltage profile. In addition, they show reduced specific capacities compared to materials with lower nitrogen content. Lastly, it is important to highlight that the incorporation of sieving carbons results in a significant overall increase in capacity compared to materials without sieving carbons. The highest capacities were obtained for the core shell carbon pyrolyzed at 1000°C reaching reversible capacities of 381 +/- 4 mAh g–1 . Discussion: The nitrogen active sites in the as-synthesized materials facilitate the adsorption of Na+ ions, indicating that Na+ ions preferentially adhere to these active sites during the sodiation process. Moreover, the relatively low capacity observed in materials with higher nitrogen content may be attributed to their lower electrical conductivity.
T2 - Batterieforum 2025
CY - Berlin, Germany
DA - 21.01.2025
KW - Sodium-ion batteries
KW - Hard carbon
KW - Core-shell materials
PY - 2025
AN - OPUS4-65131
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Mieller, Björn
T1 - Characterization of Beta-Alumina Solid Electrolyte by Coin Cell Testing
N2 - All solid-state batteries (ASSBs) are the subject of widespread research, one reason being their predicted increased safety [1]. Variants of beta-alumina solid electrolyte (BASE), a promising solid electrolyte for sodium ion batteries, exhibit ion conductivities up to 5 mS/cm at room temperature, which motivates targeted research and testing [2]. Dedicated measurement cells for conductivity measurements and cycling of ASSBs are available, providing even pressure and temperature control. However, these are often costly and thus unsuitable for long-term studies with many cells. In contrast, coin cells are a practical and scalable approach for such ASSB studies, despite poor pressure control and other influencing factors that may affect the reproducibility of results [3].
This study investigates the extent to which reliable measurement data can be obtained from symmetrical Na/BASE/Na coin cells. Therefore, several testing procedures and different cell architectures are considered. The experiments are supported by an electrical equivalent circuit model. The modeling approach and both measured and numerically simulated data are presented. The coin cell results are compared to data acquired using a designated ASSB setup (CompreCell and CompreFrame by RHD).
T2 - XIXth Conference of the EuropeanCeramic Society / SBS6 InternationalSodium Battery Symposium
CY - Dresden, Germany
DA - 01.09.2025
KW - Beta aluminate solid electrolyte
KW - Coin cell
PY - 2025
AN - OPUS4-64055
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Habibimarkani, Heydar
A1 - Abram, Sarah-Luise
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Prinz, Carsten
A1 - Sahre, Mario
A1 - Hodoroaba, Vasile-Dan
A1 - Radnik, Jörg
T1 - In-depth analysis of FeNi-based nanoparticles for the oxygen evolution reaction
N2 - This study investigates the effect of varying iron-to-nickel ratios on the catalytic performance of Fe-Ni oxide nanoparticles (NPs) for the oxygen evolution reaction (OER). Addressing the issue of high energy wastage due to large overpotentials in OER, we synthesized and characterized different NP catalysts with different Fe: Ni oxide ratios. Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Spectroscopy (EDS), and X-ray Diffraction (XRD) were employed to determine the morphology, elemental and phase composition of the NPs. Furthermore, in-depth profiling with X-ray Photoelectron Spectroscopy (XPS) and Hard X-ray Photoelectron Spectroscopy (HAXPES) revealed that iron predominantly exists as oxide, while nickel exhibits both metallic and oxidic forms depending on the Fe content. XPS indicated an enrichment of iron at the NP surface, whereas HAXPES and EDS data agreed on the bulk stoichiometry. The assessment of the catalytic activity via cyclic voltammetry (CV) showed that the Fe: Ni ratio of 2:3 exhibited superior performance, characterized by lower overpotential and a smaller Tafel slope.
KW - Fe-Ni oxide
KW - Nanoparticles
KW - OER
KW - Catalytic performance
KW - Cyclic voltammetry
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-626932
UR - https://www.nature.com/articles/s41598-025-92720-3
DO - https://doi.org/10.1038/s41598-025-92720-3
VL - 15
IS - 1
SP - 1
EP - 17
PB - Springer Nature
AN - OPUS4-62693
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Appel, Paul Alexander
T1 - Probing Structural Changes in Sodium-Ion Battery materials with Operando SAXS
N2 - Operando small-angle X-Ray scattering (SAXS) can provide direct insight into nanoscale structural changes occurring during electrochemical operation. This workshop will provide a general overview of the fundamentals of SAXS and highlight its potential on a range of case studies. This talk will highlight how operando SAXS complements conventional electrochemical characterization by revealing dynamic, irreversible structural processes that govern performance and stability in energy storage materials
T2 - Operando Workshop
CY - Berlin, Germany
DA - 17.09.2025
KW - Small Angle X-Ray Scattering
KW - Operando Measurments
PY - 2025
AN - OPUS4-65119
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Leonhardt, Robert
T1 - Characterization of overdischarge-related degradation in commercial sodium-ion cells
N2 - Sodium-ion batteries (SIBs) have recently gained significant attention as a cost-effective and sustainable alternative to lithium-ion batteries for large-scale energy storage applications and battery-electric vehicles. With their ability to be fully discharged to 0 V, they allow much safer handling and transport. The reversibility of such a complete discharge is, however, debated as the solid electrolyte interphase (SEI) formed by commonly used electrolytes in SIBs becomes unstable at low full-cell voltages.
In the present study, the effects of overdischarging SIBs and the implications on their long-term impedance degradation are investigated for commercial SIB-cells, comprising sodium nickel manganese iron oxide (NaNi0.33Mn0.33Fe0.33O2) as cathode active material. During the study, extensive characterization measurements (e.g., electrochemical impedance spectroscopy, open-circuit voltage analysis, etc.) were performed at various stages of degradation. This allows the monitoring of the electrochemical characteristics of the tested SIBs.
Notably, the long-term degradation behavior of the cells was significantly affected, indicating lasting changes in the passivating properties of the altered SEI. Finally, the results show that overdischarging can indeed cause irreversible changes in sodium-ion batteries, emphasizing the need to enhance their stability at low full-cell voltages to make the best possible use of their potential safety features.
T2 - SBS6 – International Sodium Battery Symposium
CY - Dresden, Germany
DA - 03.09.2025
KW - Overdischarge of sodium ion batteries
KW - Solid electrolyte interphase
KW - Impedance spectroscopy
KW - Battery degradation and aging
PY - 2025
AN - OPUS4-65066
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Cornelio, Andrea
T1 - NASICON Electrolytes for Room-Temperature Sodium-Sulfur Batteries with NaK Alloy Negative Electrode Interface
N2 - The aim of the research is to develop a novel NASICON (NA Super Ionic CONductor) electrolyte for room-temperature (RT) sodium-sulfur (Na-S) cells employing a liquid sodium-potassium (NaK) alloy at the negative-electrode interface. The NaK alloy can improve the interfacial contact between the sodium-metal electrode and the solid electrolyte. The synthesized NASICON material must be stable with the alkali-metal alloy and provide good electrochemical performance at RT.
T2 - 6th Sodium Battery Symposium
CY - Dresden, Germany
DA - 03.09.2025
KW - Solid Electrolyte
KW - NASICON
KW - Solid-state batteries
KW - Sodium conductors
KW - Material synthesis
PY - 2025
AN - OPUS4-64080
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Sander, Luise
T1 - Links Between Electrode Properties and Cell Performance in Commercial Sodium-Ion Batteries
N2 - Our latest results of commercially purchased cylindrical sodium ion battery (SIB) cells will be presented. Two different cell types were dissasembled and thouroughly characterized on electrode as well as on material level.
Both cell types comprise aluminum current collectors for anode and cathode, respectively. Furthermore, geometric electrode parameters, such as electrode size, thickness and loading, will be presented and linked to the electrical data-sheet values. Further in-depth characterization on material level revealed that both cathode active materials are composed of a cobalt free Ni-Mn-Fe-oxide. Interestingly, the cathode particles significantly differ in shape and size between the two cell types. Both anode active materials are graphite-free, and the particle structure points in both cases to a biomass-derived hard carbon material. Based on gas chromatography mesaurements coupled with mass spectrometry (GC-MS), both cell types utilize a mixture of carbonates as electrolyte, however, contain different conductive salts. Moreover, the measured, characteristic electrical features, e.g., capacity, Coulombic efficiency, and initial cycle life, will be discussed. Intriguingly, the cycling stability greatly differs between the cell types. Presumably, this behaviour can be mainly linked to the different morphology of the cathode active material.
Overall, the work can give important insights in the composition and electrical behabiour of currently available SIB-cells.
T2 - Sodium Battery Symposium (SBS-6)
CY - Dresden, Germany
DA - 03.09.2025
KW - Battery
KW - Sodium-Ion-Battery
KW - Electrochemical Energy Storage
KW - Energy Storage
PY - 2025
AN - OPUS4-64411
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Hajhariri, Aliasghar
A1 - Eberwein, Robert
T1 - Cryogenic storage system behaviour under fire
N2 - The transition from fossil fuels to low-emission alternatives is essential to mitigate carbon emissions in energy-intensive sectors. Liquid hydrogen (LH2) is a promising energy carrier due to its high gravimetric energy density, but its storage requires advanced insulation to minimize heat ingress and prevent excessive boil-off losses. Multilayer insulation (MLI), perlite, and microspheres are commonly used under vacuum conditions, yet their performance under fire exposure remains a critical concern.
This study investigates the thermal degradation of insulation materials and its impact on heat transfer in an event with extreme thermal load conditions using the Cryogenic High-Temperature Thermal Vacuum Chamber (CHTTVC). The heat flow dynamics are analyzed, and an equivalent heat transfer coefficient is proposed to quantify the impact of insulation deterioration as the outer wall temperature increases.
Additionally, a novel liquid-vapor interface monitoring method is introduced to improve real-time detection of phase changes within the tank. The results highlight that insulation failure substantially increases the heat flow, which, if not mitigated, can lead to boiling liquid expanding vapor explosions (BLEVE), jet fires, or catastrophic tank failure. The findings provide valuable insights into optimizing LH2 storage safety and improving emergency response strategies for cryogenic tanks exposed to extreme thermal conditions.
T2 - International Conference of Hydrogen Safety
CY - Seoul, Korea
DA - 23.09.2025
KW - Hydrogen Storages
KW - Liquid Hydrogen
KW - Fire safety
KW - Heat Transfer
PY - 2025
SN - 979-12-243-0274-2
SP - 1149
EP - 1160
AN - OPUS4-65546
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Sander, Luise
T1 - Linking Material and Electrode Properties to the Cell Performance of Two Types of Commercially Available SIBs
N2 - As the first commercial sodium-ion-batteries (SIBs) are available for purchase, it is possible to investigate material composition. Gaining an insight into the material composition of these SIBs is of interest not only for the classification of possible safety risks and hazards, but also in regards to recycling. Herein we report the preliminary investigations of the chemical and structural composition of first commercial SIB-cells. Two different SIB-cell types were compared in terms of electrode size, thickness, loading etc. Furthermore, the composition of the active materials and electrolyte was investigated and compared. Finally, the gained results were linked to the different data sheet performance of the two cell types.
T2 - WISPER - Women in Science Promoting Energy Research
CY - London, UK
DA - 21.05.2025
KW - Battery
KW - Sodium-Ion-Battery
KW - Electrochemical Energy Storage
KW - Energy Storage
PY - 2025
AN - OPUS4-63284
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Fellinger, Tim-Patrick
T1 - Basics, Challenges and Trends in Electrochemical Energy Storage
N2 - In this lecture the fundamental principles of batteries are briefly introduced aligned by the historical development of the technology. The introduction is continued with an overview on current challenges regarding performance, durability, sustainability, cost and safety. Lastly, research trend on approaches to tackle the challenges are discussed by selected examples.
T2 - Basics, Challenges and Trends in Electrochemical Energy Storage
CY - Cottbus, Germany
DA - 15.09.2025
KW - Batteries
KW - Electrochemistry
KW - Energy Materials
PY - 2025
AN - OPUS4-64919
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Fellinger, Tim-Patrick
T1 - Core-shell type carbon anodes for na-ion batteries
N2 - Increasing prices of the material basis for lithium-ion batteries caused by limited production capacities or resource abundance has led to a renewed interest in sodium ion batteries (SIBs). Therein, amorphous disordered carbons such as hard carbons (HCs) are promising candidates for high-capacity negative electrode materials in SIBs. Their high capacities, however, are often accompanied with high irreversible capacity losses during the initial cycles,[1] while low initial losses are mostly accompanied with moderate capacities.[2] In our research we are aiming at morphologically improved carbons to reduce irreversible losses using a core-shell concept, leading to spacial separation of the reversible storage and unfavorable side reactions.[3]
We investigated different methods to obtain core-shell structures with improved interfaces to restrict SEI formation to the external particle surface, while leveraging the Na storage potential of porous carbon core materials. With a simple and scalable chemical vapour deposition we obtained a 190-fold decrease in surface roughness, resulting in drastically reduced first cycle losses. Interestingly, the sodiation capacity at the same time increased to 400 mAh/g revealing the interference of excessive SEI formation with the storage process within the particles.
T2 - Research Seminar of the Dahn Labs at Dalhousie University
CY - Halifax, Canada
DA - 27.05.2025
KW - Natrium-Ionen-Batterien
KW - Synthetische Anoden
KW - Kohlenstoff
PY - 2025
AN - OPUS4-64912
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -