TY  - JOUR
AU  - Li, Dongjiang
AU  - Li, Hu
AU  - Danilov, Dmitri
AU  - Gao, Lu
AU  - Chen, Xiaoxuan
AU  - Zhang, Zhongru
AU  - Zhou, Jiang
AU  - Eichel, Rüdiger-A.
AU  - Yang, Yong
AU  - Notten, Peter H. L.
TI  - Degradation mechanisms of C6/LiNi0.5Mn0.3Co0.2O2 Li-ion batteries unraveled by non-destructive and post-mortem methods
JO  - Journal of power sources
VL  - 416
SN  - 0378-7753
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - FZJ-2019-03150
SP  - 163 - 174
PY  - 2019
AB  - The ageing mechanisms of C6/LiNi0.5Mn0.3Co0.2O2 batteries at various discharging currents and temperatures have systematically been investigated with electrochemical and post-mortem analyses. The irreversible capacity losses () at various ageing conditions are calculated on the basis of regularly determined electromotive force (EMF) curves. Two stages can be distinguished for the degradation of the storage capacity at 30 °C. The first stage includes SEI formation, cathode dissolution, etc. The second stage is related to battery polarization. The various degradation mechanisms of the individual electrodes have been distinguished by vs and vs plots. The Solid-Electrolyte-Interface (SEI) formation as well as the electrode degradation has been experimentally confirmed by XPS analyses. Both Ni and Mn elements are detected at the anode while Co is absent, indicating that the bonding of Co atoms is more robust in the cathode host structure. A Cathode-Electrolyte-Interface (CEI) layer is also detected at the cathode surface. The composition of the CEI layer includes Li salts, such as LiF, LiCOOR, as well as transition metal compounds like NiF2. Cathode dissolution is considered to be responsible for both the NiF2 detected at the cathode and Ni at the anode.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000459839100021
DO  - DOI:10.1016/j.jpowsour.2019.01.083
UR  - https://juser.fz-juelich.de/record/863003
ER  -