TY  - JOUR
AU  - Chen, Zhiqiang
AU  - Danilov, Dmitri
AU  - Raijmakers, Luc
AU  - Chayambuka, Kudakwashe
AU  - Jiang, Ming
AU  - Zhou, Lei
AU  - Zhou, Jiang
AU  - Eichel, Rüdiger-A.
AU  - Notten, Peter H. L.
TI  - Overpotential analysis of graphite-based Li-ion batteries seen from a porous electrode modeling perspective
JO  - Journal of power sources
VL  - 509
SN  - 0378-7753
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - FZJ-2021-05315
SP  - 230345 -
PY  - 2021
AB  - The overpotential of Li-ion batteries is one of the most relevant characteristics influencing the power and energy densities of these battery systems. However, the intrinsic complexity and multi-influencing factors make it challenging to analyze the overpotential precisely. To decompose the total overpotential of a battery into various individual components, a pseudo-two-dimensional (P2D) model has been adopted and used for electrochemical simulations of a graphite-based porous electrode/Li battery. Analytical expressions for the total overpotential have been mathematically derived and split up into four terms, associated with the electrolyte concentration overpotential, the Li concentration overpotential in the solid, the kinetic overpotential, and the ohmic overpotential. All these four terms have been separately analyzed and are found to be strongly dependent on the physical/chemical battery parameters and the reaction-rate distribution inside the porous electrode. The reaction-rate distribution of the porous electrode is generally non-uniform and shows dynamic changes during (dis)charging, resulting in fluctuations in the four overpotential components. In addition, the disappearance of the phase-change information in the voltage curve of the graphite-based porous electrode/Li battery under moderate and high C-rates is ascribed to the Li concentration overpotential among solid particles, resulting from the non-uniform reaction-rate distribution.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000691505700002
DO  - DOI:10.1016/j.jpowsour.2021.230345
UR  - https://juser.fz-juelich.de/record/903666
ER  -