A sustainable and rigid-flexible coupling cellulose-supported poly(propylene carbonate) polymer electrolyte towards 5 V high voltage lithium batteries

Abstract

Inspired by their higher energy density, high voltage lithium ion batteries (LIBs) have been given great attention recently. However, decomposition of traditional liquid electrolyte hinders the development of high voltage LIBs. Herein, we explored a sustainable and rigid-flexible coupling cellulose-supported poly(propylene carbonate) (PPC) polymer electrolyte for LiNi0.5Mn1.5O4-based batteries. The incorporating of robust cellulose as skeleton effectively surmounts the drawback of poor mechanical integrity of the gel polymer electrolyte. It was demonstrated that the polymer electrolyte exhibited wider electrochemical window (up to 5.0V), higher ion transference number (0.68) and higher ionic conductivity (1.14mScm⿿1) compared to liquid electrolyte with commercial separator at 25°C. Thus, 5V high voltage batteries with this kind polymer electrolyte display excellent capacity retention and superior rate performance for at room temperature. The Above mentioned attracting characteristics would endow PPC-based polymer electrolyte a promising candidate for high energy density LIBs.