Zwitterionic metal covalent organic frameworks constructed from lithium salts to reinforce poly(ethylene oxide)/poly(propylene carbonate) composite polymer electrolytes

Li + was coordinated with zwitterionic part (squaric acid) of HUT4 by mechanical grinding to form metal covalent organic frameworks (HUT4Li), which was used as filler of PEO and PPC to improve the ionic conductivity of composite polymer electrolytes.