TY  - JOUR
A1  - Scharpmann, Philippa
A1  - Leonhardt, Robert
A1  - Schmidt, Anita
A1  - Kowal, Julia
A1  - Tichter, Tim
A1  - Krug von Nidda, Jonas
T1  - Exploring restrictive overdischarge cycling as a method to accelerate characteristic ageing in lithium-ion cells
JF  - Journal of Power Sources
N2  - This study presents a test protocol that greatly accelerates the ageing process of lithium-ion battery cells comprising a positive electrode of nickel manganese cobalt oxide while preserving their characteristic degradation upon cyclic ageing. Applying a repetitive restricted overdischarge, resulting in a depth of discharge larger than 100%, a capacity loss of 20% is achieved over five times faster compared to conventional cycling. The well-known overdischarge degradation phenomenon of copper current collector dissolution is deliberately prevented by setting a discharge cutoff voltage above the theoretical threshold of copper oxidation. Hence, the accelerated degradation can be primarily connected to solid electrolyte interphase growth.
A comparative assessment of the ageing dynamics using electrochemical impedance spectroscopy and differential voltage analysis hints towards similar, characteristic degradation processes during accelerated and conventional ageing. A post-ageing examination of the electrical behaviour (i.e., coulombic and energy efficiency, capacity fade) under reference conditions reveals very little to no lasting damages caused by 
overdischarging. Additionally, post-mortem analysis discloses no increased copper dissolution when comparing cells subjected to accelerated and conventional ageing. Generally, the developed ageing method appears suitable for providing cells with a defined state of health at a reasonable timescale without altering the main degradation mechanisms significantly.
KW  - Lithium-ion cell
KW  - Accelerated ageing
KW  - Overdischarge
KW  - Degradation processes
KW  - Differential voltage analysis
KW  - Electrochemical impedance spectroscopy
PY  - 2026
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:b43-650917
DO  - https://doi.org/10.1016/j.jpowsour.2025.239072
SN  - 0378-7753
VL  - 665
SP  - 1
EP  - 9
PB  - Elsevier B.V.
AN  - OPUS4-65091
LA  - eng
AD  - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER  -