Ionic liquid incorporated nanocomposite polymer electrolytes for rechargeable lithium ion battery: A way to achieve improved electrochemical and interfacial properties

An ionic liquid incorporated nanocomposite electrolytes are prepared using solution cast technique by immobilizing a solution of lithium N,N-bis(trifluoromethanesulfonyl)imide (LiTFSI) in N-ethyl-N-methylimidazolium - bis(trifluoromethanesulfonyl) imide (EMImTFSI) ionic liquid (IL) with added mixtures of organic solvent and nanofiller such as acetonitrile and nanochitosan (32 nm) into a poly(ethylene oxide) (PEO) matrix. The achieved extreme ionic conductivity of ionic liquid based electrolyte is in the range of 10−2 S cm−1 which is one order higher than that of (PEO)8LiTFSI-10 wt% NC system. Cyclic voltammetry and linear sweep voltammetry (LSV) analyses indicates that the prepared electrolytes possesses an excellent electrochemical stability of 3.9 V. These unique properties allow the effective use of these membranes as active separators for the development of advanced lithium ion batteries.

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