Method for preparing gel copolymer electrolyte through in-situ ring-opening copolymerization

• Main Authors: LI BAOHUA, CAI BIYA, LIU QI, WANG QIANG
• Format: Patent
• Language: Chinese; English
• Published: 27.11.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a method for preparing a gel copolymer electrolyte through in-situ ring-opening copolymerization. The preparation method comprises the following steps: in a high-purity argon atmosphere, mixing a five-membered cyclic ether solvent 1, 3-dioxolane DOL and tetrahydrofuran THF according to a certain volume ratio; then sequentially dissolving a lithium salt additive, an electrolyte lithium salt and an ionic liquid into the mixed solvent to obtain a copolymer precursor solution; introducing the copolymer precursor solution into a commercial diaphragm in a liquid injection form, and assembling into a button cell; placing the assembled button cell at room temperature for a long time; after the DOL and THF are fully reacted, carrying out ring-opening copolymerization curingto form a gel copolymer electrolyte, and carrying out in-situ preparation to obtain the copolymer-based gel cell. The technical method is simple and convenient, in-situ ring-opening copolymerization reaction of cyclic ether i