POLYOLEFIN COMPOSITE SEPARATOR, METHOD FOR MAKING THE SAME, AND LITHIUM ION BATTERY USING THE SAME

摘要

A method for making a polyolefin composite separator is disclosed. Methyl methacrylate and γ-(triethoxysilyl)propyl methacrylate are polymerized to form a copolymer. The copolymer is dissolved in a first solvent to form a copolymer solution. The copolymer solution is applied to a surface of a polyolefin porous film, and dried to form a gel polymer electrolyte precursor layer on the surface of the polyolefin porous film. The polyolefin porous film having the gel polymer electrolyte precursor layer applied thereon is fumigated in an atmosphere of hydrochloric acid gas. A polyolefin composite separator and a lithium ion battery are also disclosed.

主权项

1. A method for making a polyolefin composite separator comprising:
polymerizing methyl methacrylate and γ-(triethoxysilyl)propyl methacrylate to form a copolymer, the copolymer is represented by a formula:wherein m and n are integers;
dissolving the copolymer in a first solvent to form a copolymer solution; applying the copolymer solution to a surface of a polyolefin porous film; drying the copolymer solution to form a gel polymer electrolyte precursor layer on the surface of the polyolefin porous film; and fumigating the polyolefin porous film having the gel polymer electrolyte precursor layer applied thereon in an atmosphere of hydrochloric acid gas.