Solid polymer electrolyte including crosslinked polymer of lactone/cyclic carbonate, and method of preparing the same

Abstract

A method for preparing a film of solid polymer electrolyte, including: (i) providing a composition including, in one or more solvents, at least one (co)polymer of at least one cyclic monomer selected from lactones and cyclic carbonates with five to eight ring members; the (co)polymer or (co)polymers having free terminal hydroxyl functions; at least one crosslinking agent, at least one ionic conductive salt; and optionally, in the case of a crosslinking agent bearing at least one photosensitive reactive function, at least one photoinitiator compound; (ii) forming a dry film from the composition, in conditions unfavourable to crosslinking of the (co)polymer or (co)polymers; and (iii) bringing the film into conditions favourable to crosslinking of the (co)polymer or (co)polymers to form the film of solid polymer electrolyte. Also disclosed is a film of solid polymer electrolyte and use thereof in an electrochemical system, in particular in a lithium battery.