All-solid-state double-layer composite positive electrode, preparation method thereof and lithium ion battery

• Main Authors: ZHUANG ZHI, ZHU JUNCHANG, PAN XINGXING, LIU YANG
• Format: Patent
• Language: Chinese; English
• Published: 14.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses an all-solid-state double-layer composite positive electrode, a preparation method thereof and a lithium ion battery. The all-solid-state double-layer composite positive electrode is composed of a current collector, a first composite positive electrode layer and a second composite positive electrode layer, wherein the first composite positive electrode layer and the second composite positive electrode layer are sequentially overlaid on the current collector. The first composite positive electrode layer and the second composite positive electrode layer are each composed of a positive electrode active material, a solid electrolyte, a conductive agent and a binder. Wherein the ionic conductivity of the solid electrolyte of the first composite positive electrode layer is higher than that of the second composite positive electrode layer, and/or the content of the positive electrode active material of the first composite positive electrode layer is lower than that of the second composite pos