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

A technology of coating lithium cobalt oxide and positive electrode materials, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of high cost, incapable of industrial production, and difficult operation, and achieve low cost, short time consumption, Performance-enhancing effects

Inactive Publication Date: 2018-06-15
王顺良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this embodiment, the chemical formula of niobium modified lithium cobaltate is LiCo 0.86 Fe 0.12 Nb 0.02 o 2 According to the molar weight of Li, Fe, Nb, Co in the above chemical formula, lithium carbonate, iron acetate, niobium oxide and cobalt oxide are weighed, and an appropriate amount of water and ethanol are used as the dispersion medium, and the raw materials taken symmetrically are mixed by wet ball milling , to obtain a mixed slurry; spray-dry the mixed slurry to obtain lithium cobaltate precursor powder.

[0019] Apply a plasma arc to the precursor powder in a reducing atmosphere to melt the reaction powder, the plasma arc voltage is 20kV, and the plasma arc current is 500A; the molten reaction powder is sprayed into the cooling device with a reducing gas, and the particles are pulverized after cooling Sieving, the niobium-modified lithium cobalt oxide material with a particle size of 5 microns obtained through sieving; wherein the diameter of the nozzle...

Embodiment 2

[0024] In this embodiment, the chemical formula of niobium modified lithium cobaltate is LiCo 0.82 Fe 0.15 Nb 0.03 o 2 . Weigh lithium carbonate, iron acetate, niobium oxide and cobalt oxide according to the molar weights of Li, Fe, Nb and Co in the above chemical formula, and use an appropriate amount of water and ethanol as the dispersion medium, and carry out wet ball milling of the raw materials that are taken symmetrically. The mixed slurry is obtained; the mixed slurry is spray-dried to obtain lithium cobaltate precursor powder.

[0025] Apply a plasma arc to the precursor powder in a reducing atmosphere to melt the reaction powder, the plasma arc voltage is 40kV, and the plasma arc current is 1000A; the molten reaction powder is sprayed into the cooling device with a reducing gas, and the particles are pulverized after cooling Sieving, the niobium-modified lithium cobaltate material with a particle size of 10 microns obtained through sieving; wherein the diameter of...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/366H01M4/525H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 王顺良
Owner 王顺良
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