Novel piperidinium-based ionic liquid as electrolyte additive for high voltage lithium-ion batteries.

Conventional carbonate-based electrolyte is prone to oxidative decomposition at high voltage (over 4.5 V Li/Li), which leads to the bad oxidation stability and inferior cycling performance of lithium ion batteries (LIBs). To solve these problems, a novel ionic liquid (IL) -butyronitrile--methylpiperidinium bis(fluorosulfonyl)imide (PPFSI) was synthesized and explored as the additive to the LiPF-ethylene carbonate (EC)/dimethyl carbonate (DMC) electrolyte.