Composite negative plate, preparation method thereof and lithium ion battery comprising composite negative plate

• Main Authors: WANG YIFEI, WANG LEI, REN LIMING, SHIN YOUNG KWAN, ZHUANG HUAJIE
• Format: Patent
• Language: Chinese; English
• Published: 24.10.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a composite negative plate, a preparation method thereof and a lithium ion battery comprising the composite negative plate. The composite negative plate comprises a current collector, a first coating coated on at least one surface of the current collector and a second coating coated on the surface of the first coating, the first coating comprises a negative electrode active material, a thickening agent, a binder and a conductive agent, and the second coating comprises a lithium-containing solid electrolyte. The negative active material in the first coating can improve the specific capacity and conductivity of the battery, and the second coating can effectively improve the diffusion rate of lithium ions in the pre-lithiation process, reduce the consumption of active lithium in the pre-lithiation process, and avoid non-uniform pre-lithiation, thereby causing local lithium precipitation and further affecting the safety and cycle life of the battery; and the distribution sequence of the fir