TY  - JOUR
AU  - Hildebrand, S
AU  - Rheinfeld, A.
AU  - Friesen, A
AU  - Haetge, J
AU  - Schappacher, F. M
AU  - Jossen, A
AU  - Winter, Martin
TI  - Thermal analysis of LiNi0.4Co0.2Mn0.4O2/mesocarbon microbeads cells and electrodes: State-of-charge and state-of-health influences on reaction kinetics
JO  - Journal of the Electrochemical Society
VL  - 165
SN  - 0013-4651
CY  - Pennington, NJ
PB  - Electrochemical Soc.
M1  - FZJ-2018-04871
SP  - A104-A117
PY  - 2018
AB  - The thermal stability of lithium ion batteries was studied by means of Accelerating Rate Calorimetry in Heat-Wait-Search operation on both electrode and cell level. Fresh and aged samples were investigated depending on the state-of-charge (SoC) of a 5 Ah pouch cell comprising mesocarbon microbeads and LiNi0.4Co0.2Mn0.4O2 as the anode and cathode materials. 1 M LiPF6 in EC:DEC 3:7 (by weight) containing 2 wt% VC and 0.5 wt% LiBOB was chosen as the electrolyte. Measurements on the electrode level revealed a higher self-heating rate (SHR) of the cathode compared to the anode for all SoC and state-of-health (SoH) combinations in the temperature range where a self-sustaining decomposition reaction could be detected. A lower SoC showed a lower SHR of the electrode/electrolyte mixture with no reaction detected on the anode side ≤ 50% cell SoC. Cyclic aging led to a decrease in thermal stability of the cathode at lower SoC values with no significant influence on the anode implying a larger safety threat on the cell level. Avrami-Erofeev and autocatalytic reaction models were used to quantify the influences of SoC and SoH on reaction kinetics. Full cell measurements confirmed the observations at a higher SHR.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000431786800014
DO  - DOI:10.1149/2.0361802jes
UR  - https://juser.fz-juelich.de/record/851171
ER  -