Cathode plate and preparation method thereof and lithium ion battery

Abstract

The invention provides a cathode plate and a preparation method thereof and a lithium ion battery. The cathode plate consists of a cathode current collector and a cathode active substance layer. The cathode active substance layer consists of a cathode active material, a conductive agent; a binder; and an additive. The additive of the cathode plate disclosed by the invention can coat the surface of the cathode active material well after catalytic polymerization under voltage, so that a layer of uniformly distributed protective film is formed, and thereby the objective of improving the electrochemical properties of lithium ion batteries is achieved.

Description

technical field

[0001] The invention relates to the technical field of lithium ion batteries, in particular to a cathode pole piece, a preparation method thereof, and a lithium ion battery. Background technique

[0002] Lithium-ion batteries have become the mainstream development direction of secondary batteries due to their excellent performance. However, with the development of battery technology, the requirements for battery energy density are getting higher and higher. The battery energy density is determined by the theoretical energy density of the battery and the proportion of inactive materials (such as conductive agents, binders, etc.). Therefore, in order to continue to improve the energy density of batteries, in addition to reducing the specific gravity of inactive materials, more efforts should be made to develop active materials based on high voltage, especially cathode active materials, so as to increase the lithium intercalation and desorption potential of cat...

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