Coating method of nickel cobalt lithium manganate positive electrode material

A technology of nickel-cobalt-lithium-manganese-manganese oxide and positive electrode materials, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of battery cycle attenuation, increased processing costs, damage, etc., to avoid irreversible loss of lithium and improve comprehensive performance , reduce the effect of premature chalking

Pending Publication Date: 2022-05-27
BATTERO TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Nickel-cobalt lithium manganese oxide cathode material is widely used in power lithium batteries because of its high energy density, long cycle life, and high voltage platform. The cathode material accounts for about 40% of the cost of a single cell, and its performance is directly related to the cell and The energy density, safety, and life of the system, etc. Surface coating is the main way to modify the cathode material of nickel-cobalt lithium manganese oxide. A uniform and dense coating layer can greatly improve the comprehensive performance of nickel-cobalt lithium manganese oxide. At present, the main coating method There are wet method, dry method, atomic deposition ALD, chemical deposition CVD, etc. Among them, the coating method of dry mixing + heat treatment with simple process and low cost is wid

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  • Coating method of nickel cobalt lithium manganate positive electrode material
  • Coating method of nickel cobalt lithium manganate positive electrode material
  • Coating method of nickel cobalt lithium manganate positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] This embodiment provides a method for coating a cathode material of nickel cobalt lithium manganate.

[0036] (1) dissolving aluminum dihydrogen phosphate in deionized water to obtain a uniform aqueous solution containing Al element, preparing a concentration of 2 mol / L, and then cross-linking to obtain an Al-containing saline gel;

[0037] (2) Coating the Al-containing saline gel obtained in step (1) on the screen, forming a thin film with the screen holes of the screen, and coating the nickel-cobalt lithium manganate cathode material particles; nickel-cobalt lithium manganate; When the positive electrode material particles are in contact with the film, the film stretches and completely wraps the nickel-cobalt lithium manganate positive electrode material particles, and the nickel-cobalt lithium manganate positive electrode material particles fall off (such as figure 1 described); obtain the nickel-cobalt lithium manganate cathode material encapsulated by the initial A...

Embodiment 2

[0042] This embodiment provides a method for coating a cathode material of nickel cobalt lithium manganate.

[0043] (1) dissolving aluminum dihydrogen phosphate in deionized water to obtain a uniform aqueous solution containing Al element, preparing a concentration of 0.5 mol / L, and then cross-linking to obtain an Al-containing hydrogel;

[0044] (2) Coating the Al-containing saline gel obtained in step (1) on the screen, forming a thin film with the screen holes of the screen, and coating the nickel-cobalt lithium manganate cathode material particles; nickel-cobalt lithium manganate; During the falling process of the positive electrode material particles, the film contacts the film, the film stretches and completely wraps the nickel-cobalt lithium manganate positive electrode material particles, and the nickel-cobalt lithium manganate positive electrode material particles fall off; the nickel-cobalt lithium manganate positive electrode wrapped by the initial Al-containing bri...

Embodiment 3

[0048] This embodiment provides a method for coating a cathode material of nickel cobalt lithium manganate.

[0049](1) dissolving aluminum dihydrogen phosphate in deionized water to obtain a uniform aqueous solution containing Al element, preparing a concentration of 5 mol / L, and then cross-linking to obtain an Al-containing saline gel;

[0050] (2) Coating the Al-containing saline gel obtained in step (1) on the screen, forming a thin film with the screen holes of the screen, and coating the nickel-cobalt lithium manganate cathode material particles; nickel-cobalt lithium manganate; During the falling process of the positive electrode material particles, the film contacts the film, the film stretches and completely wraps the nickel-cobalt lithium manganate positive electrode material particles, and the nickel-cobalt lithium manganate positive electrode material particles fall off; the nickel-cobalt lithium manganate positive electrode wrapped by the initial Al-containing brin...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a coating method of a nickel cobalt lithium manganate positive electrode material. A screen coated with metal salt gel is used for carrying out coating treatment on nickel cobalt lithium manganate positive electrode material particles, the metal salt gel forms a thin film in meshes of the screen, the coating treatment is that the nickel cobalt lithium manganate positive electrode material particles make contact with the thin film in the falling process, and the thin film is stretched and completely wraps the nickel cobalt lithium manganate positive electrode material particles. The nickel cobalt lithium manganate positive electrode material particles fall off; and forming a coating layer on the surface of the nickel cobalt lithium manganate positive electrode material particle. The defect that a uniform coating layer cannot be formed by dry physical coating is avoided, a uniform and compact'protective layer 'is formed on the surface of the nickel cobalt lithium manganate positive electrode material, and the cycle performance of a corresponding battery cell is effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for coating a positive electrode material of nickel cobalt manganate lithium. Background technique [0002] Nickel cobalt lithium manganate cathode material is widely used in power lithium batteries because of its high energy density, long cycle life and high voltage platform. The cathode material accounts for about 40% of the cost of a single cell, and its performance is directly related to the cell and The energy density, safety, lifespan of the system, etc., surface coating is the main way to modify the nickel-cobalt lithium manganate cathode material. A uniform and dense coating layer can greatly improve the comprehensive performance of nickel-cobalt lithium manganate. At present, the main coating method There are wet method, dry method, atomic deposition ALD, chemical deposition CVD, etc. Among them, the coating method of dry mixing + heat treatment wi...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/525H01M4/505Y02E60/10
Inventor 栗志涛刘阳
Owner BATTERO TECH CORP LTD
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