Cross-Linked Alternately Copolymerized Electrolyte Poly (styrene-a-maleic ester) Synthesized through Solvent-Free Strategy

Abstract

A solvent-free cross-linked alternating copolymer electrolyte is synthesized through photo copolymerization of comb-like poly (ethylene glycol) ester maleate and styrene. Phase transitions, thermal properties, ionic conductivities and electrochemical stabilities are investigated to characterize the alternating copolymer electrolyte. The flexible solid polymer electrolyte (spe) with lithium salt content of 15 wt.% and MA/-OH = 1 has a good ionic conductivity of 1.45×10-5 S cm-1 at 35 °C and a superior electrochemical stability to 5.2 V. The maleic anhydride on the main chain increases the rigidity of the copolymer matrix and decreases the ionic conductivity.