Theoretical and Experimental Investigations of Fluoroethylene Carbonate Electrolyte for High Performance Ni-Rich 18650 Lithium-Ion Batteries

Abstract

Lithium-ion batteries have been used widely for portable electronic devices and electric vehicles (EVs). To date, the Ni-rich LiNi0.88Co0.09Al0.03O2 layered material is a promising cathode for next-generation and advance energy storage devices.(1) Unfortunately, the Ni-rich cathode suffers from capacity fading upon cycling and poor rate performance that limit its application. To overcome these concerns, the uses of Fluoroethylene Carbonate (FEC) can effectively improve the performance and safety of the cells. Herein, the effects of the FEC concentrations on the performance of Ni-rich NCA lithium-ion batteries were investigated. We performed the combination of theoretical molecular dynamic simulations (MD) along with experimental in 18650 scale to study the electrolyte transport properties, electrochemical performances, and large-scale battery safety. We hope that the fundamental understanding on the effect of FEC could be useful for further development of the future lithium-ion batteries. REFERENCES Li, Y.; Tan, C.; Wei, S.; Cui, L.; Fan, X.; Pan, Q.; Lai, F.; Zheng, F.; Wang, H.; Li, Q. Mater. Chem. A, 2020, 8, 21649-21660.