The electrolyte plays a critical role in the performance of lithium (Li) ion batteries (LIBs). The conventional electrolytes in LIBs contain a large amount of flammable organic solvents such as linear carbonate solvents, which are the major causes for the fires of the state-of-the-art LIBs. Adding flame retardants into the Li-ion electrolytes can reduce or even eliminate the electrolyte flammability, but it normally requires to add a high content of such flame retardants and these flame retardants actually deteriorate the electrochemical performances of the LIBs. So the low-flammability electrolytes or even nonflammable electtrolytes for LIBs are highly needed to reduce the safety converns of the LIBs. In this work, we developed nonflammable localized high concentration electrolytes (LHCEs) for LIBs with graphite and silicon/graphite composite anodes and conventional Li-ion intercalation cathodes. The nonflammable LHCEs behave very similar to or even better than the conventioal LiPF<sub>6</sub>/carboante electrolytes in graphite-based LIBs, and show much better cycling performances on silicon/graphite composite anodes than the FEC-containing LiPF<sub>6</sub>/carbonate electrolytes. The findings in this study open a new pathway of developing high performance, nonflammable electrolytes for LIBs, especially for LIBs with high capacity silicon-based anodes. The details will be discussed at the presentation.

Nonflammable localized high concentration electrolytes for lithium ion batteries

2019 Fall National Meeting

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