COMPOSITE NEGATIVE PLATE, PREPARATION METHOD THEREFOR AND APPLICATION THEREOF

• Main Authors: SHI, Lei, YAN, Jiaxiao, JIANG, Chunlei, TANG, Yongbing
• Format: Patent
• Language: Chinese; English; French
• Published: 18.06.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present application provides a composite negative plate. The composite negative plate comprises a metal foil used as both a negative current collector and a negative active material, a solid electrolyte film layer provided on one surface of the metal foil, and a diamond-like film layer provided on the surface of the solid electrolyte film layer facing away from the metal foil. The solid electrolyte layer has good lithium conductivity, improves the ion diffusion rate of a composite metal negative electrode/electrolyte interface, and improves the rate capability of the battery. Moreover, the solid electrolyte layer can effectively isolate the composite metal surface from the electrolyte to avoid contact, thereby reducing the side reaction process and improving the coulombic efficiency of the battery. Furthermore, the solid electrolyte layer can also provide effective mechanical protection for the composite metal negative electrode, and ameliorate the powdering problem of the composite metal negative electro