Double-layer coating lithium supplementing positive electrode, preparation method thereof and lithium ion battery

• Main Authors: CI LIJIE, ZHANG HONGQIANG, BAI TIANSHENG, LI DEPING, QIU YUXIANG
• Format: Patent
• Language: Chinese; English
• Published: 18.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a double-layer coating lithium supplementing positive electrode, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: coating the surface of a current collector with positive electrode active material slurry to form a first active substance layer, and coating the surface of the first active substance layer with vulcanized polyacrylonitrile slurry for the second time to form a second active substance layer; and soaking in a lithium-biphenyl chemical pre-lithiation reagent to enable the sulfurized polyacrylonitrile to react to generate lithiated sulfurized polyacrylonitrile, thereby obtaining the double-layer coating lithium supplementing positive electrode. By designing a double-layer coating process and lithiating the active substance layer of the sulfurized polyacrylonitrile, the positive electrode lithium supplement layer taking the lithiated sulfurized p