Film-type composite solid electrolyte, preparation method thereof, and all-solid lithium battery

• Main Authors: XIE JIANNAN, YANG GUANG, ZHANG PENG, HAN GAIGE, CHEN LIXIA, JIN MINGGANG
• Format: Patent
• Language: Chinese; English
• Published: 10.05.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a film-type composite solid electrolyte, a preparation method thereof, and an all-solid lithium battery. The film-type composite solid electrolyte provided by the invention ismade of the material formed by lithium bisimide/polyoxyethylene/tetraethylene glycol dimethyl ether@lithium ion battery separator, which takes lithium bisimide as a lithium-inducing agent, polyoxyethylene as a polymer and binder, and tetraethylene glycol dimethyl ether as a plasticizer. The preparation method comprises the following steps: under the protection of an inert atmosphere, dissolving lithium bisimide, polyoxyethylene and tetraethylene glycol dimethyl ether in a volatile acetonitrile solvent as precursors for heating and magnetic stirring to form a uniform dilute solution, uniformlycoating the dilute solution on both sides of the lithium ion battery separator, and finally drying. The film-type composite solid electrolyte provided by the invention has many advantages such as highion conductivity at room t