Liquid-like phase of N, N-dimethylpyrrolidinium iodide impregnated into COFs endows fast lithium ion conduction in the solid state.

A novel kind of solid-state lithium electrolyte was fabricated by impregnating organic ionic plastic crystals (OIPCs) into the pores of covalent organic frameworks (COFs). The liquid-like phase of confined N,N-dimethylpyrrolidinium iodide (P1,1 I) and the ordered nanochannels of COFs simultaneously stimulated the lithium ion conduction.