TY  - JOUR
AU  - Kasnatscheew, Johannes
AU  - Placke, Tobias
AU  - Streipert, Benjamin
AU  - Rothermel, Sergej
AU  - Wagner, Ralf
AU  - Meister, Paul
AU  - Cekic-Laskovic, Isidora
AU  - Winter, Martin
TI  - A Tutorial into Practical Capacity and Mass Balancing of Lithium Ion Batteries
JO  - Journal of the Electrochemical Society
VL  - 164
IS  - 12
SN  - 1945-7111
CY  - Pennington, NJ
PB  - Electrochemical Soc.
M1  - FZJ-2018-04832
SP  - A2479 - A2486
PY  - 2017
AB  - In a lithium ion battery, balancing of active materials is an essential requirement with respect to safety and cycle life. However, capacity oversizing of negative electrodes is associated with decrease of specific energy/energy density. In this work, the required trade-off between maximized specific energy and minimized risk of lithium plating is thoroughly investigated by evaluating underlying potential/voltage curves. The adjustment of targeted state of charge (SOC) for both, positive and the negative electrode, can be achieved by intentional selection of only two parameters: negative/positive electrode active mass ratio and charge cutoff voltage. For investigation and controlling reasons, specific charge capacity reveals to be a simple but effective tool to indirectly predict electrode potentials. While cell kinetics/overvoltage are influenced by both electrodes, specific capacity losses are affected by a single electrode. The latter only correlate with negative electrode`s BET surface area as long as specific capacity losses of negative electrodes are higher compared to positive electrodes. Based on these insights, a more systematic performance and safety optimized handling of the trade-off between specific energy and safety risk can be realized.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000415283600026
DO  - DOI:10.1149/2.0961712jes
UR  - https://juser.fz-juelich.de/record/851130
ER  -