Preparation method of lithium ion conductor-coated lithium cobaltate positive electrode material

Abstract

The invention relates to a preparation method of a lithium ion conductor-coated lithium cobaltate positive electrode material. The method is simple and easy to operate and is low in cost and short inconsumed time. According to the method, Nb ions are doped into the positive electrode material, isomorphous substitution is performed on Co ion sites in positive electrode material lattices, the lattice parameter is changed, and the electrochemical performance is favorable. After an inorganic rapid-lithium ion conductor precursor solution and a lithium ion battery positive electrode material are uniformly mixed under a certain temperature, the lithium ion battery positive electrode material of which a surface is coated with rapid-lithium ion conductor colloid is obtained, a uniform coating layer is formed on a surface of a positive electrode particle after thermal processing on the lithium ion battery positive electrode material of which the surface is coated with rapid-lithium ion conductor colloid, the transmission activity of lithium ions in the electrode material can be improved, an interface between an electrolyte and a positive electrode is improved, and the battery performance is improved.

Description

Technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a lithium ion conductor-coated lithium cobalt oxide cathode material. Background technique [0002] LiCoO 2 It is the main cathode material for commercial lithium-ion batteries at present, but it has disadvantages such as expensive, not conducive to environmental protection, and low specific capacity. LiNbO 2 The positive electrode material doped with Co element also has LiNbO 2 The high discharge specific capacity of the material stabilizes the layered structure of the material and enhances the cycle stability of the material, but this material also has defects such as poor overcharge resistance, poor thermal stability, and high irreversible capacity for the first discharge. . [0003] Coating modification by solution method is a protection method that uses a material with excellent physical and chemical properties to form a layer of uniform...

AI Technical Summary

Problems solved by technology

Existing studies have applied different methods to coat and modify the cathode materials of lithium-ion batteries to address the above problems. Some researchers use atomic layer deposition, magnetron sputtering, etc. to coat cathode materials, but the operation is difficult. The cost is high, and large-scale industrial production cannot be carried out