Nanofiller incorporated poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) composite electrolytes for lithium batteries

摘要

Composite polymer electrolyte (CPE) membranes, comprising poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP), aluminum oxyhy-droxide (AlO0[OH]_n) of two different sizes 7 p.m/14 nm and LiN(C_2F_5SO_2)_2 as the lithium salt were prepared using a solution casting technique. The prepared membranes were subjected to XRD, impedance spectroscopy, compatibility and transport number studies. Also Li Cr_(0.01)Mn_(1.99)O_4/CPE/Li cells were assembled and their charge-discharge profiles made at 70 deg C. The incorporation of nanofiller greatly enhanced the ionic conductivity and the compatibility of the composite polymer electrolyte. The film which possesses a nanosized filler offered better electrochemical properties than a film with micron sized fillers. The results are discussed based on Lewis acid-base theory.