Preparation and Characteristics of Lithium Battery Separator Based on Cellulose Modification by Water-Soluble Polyimide Impregnated

Abstract In order to improve the comprehensive performance of lithium battery separator, cellulose based on separator (mCNS) was prepared by cellulose/nylon 6 with ionic liquid [Emim]Ac as solvent and enhanced polyimide (PI) impregnated solution. The properties modified were investigated. As could be discovered from experimental results that addition PI endowed separators more uniform dense micro-pores, ions can pass through better, which conducive improving electrical conductivity separator. Remarkable tensile strength (69 MPa) elongation at break (35.3%) obtained concentration 40%. Meanwhile, electrolyte absorption retention rate reached 238.7% 69.4%. value maximum thermo-shrinkage stress 1.38 N reach 1.5%, guaranteed thermal stability battery. electrochemical voltage attained 4.7 V improved 0.61×10 −3 S⋅cm −1 . mCNS preparation process simple excellent, provides a novel idea for green development