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Graphite oxide coated cathode material for lithium ion batteries

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of affecting the electronic conductivity of active material particles, difficulty in ensuring coating uniformity, and low adhesion of graphite oxide, so as to achieve improvement Effects of surface affinity, lifting force, and strong force

Active Publication Date: 2022-06-24
TORAY ADVANCED MATERIALS RES LAB CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are that the process is complicated, the coating uniformity is difficult to guarantee, and the coating layer affects the electronic conductivity between the active particles.
[0010] The problem to be solved based on the technical solution of using graphite oxide to coat the positive electrode material is that the adhesion of graphite oxide on the surface of the positive electrode material is low

Method used

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  • Graphite oxide coated cathode material for lithium ion batteries
  • Graphite oxide coated cathode material for lithium ion batteries
  • Graphite oxide coated cathode material for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Preparation method: step (1), surface treatment of graphite oxide: uniformly mix the aqueous dispersion of nitrotriacetic acid and graphite oxide, wherein the consumption of graphite oxide is 1 g. Stirring was maintained at 60°C for 5 hours. A surface-treated graphite oxide dispersion was obtained. The mass ratio of nitrotriacetic acid and graphite oxide is 1.5:1, and the number of layers of graphite oxide used is 7 layers.

[0046] Step (2), surface coating of the positive electrode material of the lithium ion battery: uniformly mix the surface-treated graphite oxide dispersion with the nickel cobalt manganese ternary material of the positive electrode material of the lithium ion battery. The amount of graphite oxide is 1 wt % of the mass of the positive electrode material. The solvent was removed at 150°C to obtain a graphite oxide-coated cathode material for lithium ion batteries.

[0047] The obtained product forms a coating layer of graphite oxide on the surface...

Embodiment 2

[0050] Preparation method: step (1), surface treatment of graphite oxide: evenly mix the aqueous dispersion of ethylenediaminetetraacetic acid and graphite oxide, wherein the consumption of graphite oxide is 1 g. Stirring was maintained at 60°C for 5 hours. A surface-treated graphite oxide dispersion was obtained. The mass ratio of ethylenediaminetetraacetic acid and graphite oxide is 1.5:1, and the number of layers of the graphite oxide used is 7 layers.

[0051] Step (2), surface coating of the positive electrode material of the lithium ion battery: uniformly mix the surface-treated graphite oxide dispersion with the nickel cobalt manganese ternary material of the positive electrode material of the lithium ion battery. The amount of graphite oxide is 1 wt % of the mass of the positive electrode material. The solvent was removed at 150°C to obtain a graphite oxide-coated cathode material for lithium ion batteries.

[0052] The obtained product forms a coating layer of grap...

Embodiment 3

[0055] Preparation method: step (1), surface treatment of graphite oxide: uniformly mix the disodium salt of ethylenediaminetetraacetic acid and the aqueous dispersion of graphite oxide, wherein the consumption of graphite oxide is 1 g. Stirring was maintained at 60°C for 5 hours. A surface-treated graphite oxide dispersion was obtained. The mass ratio of ethylenediaminetetraacetic acid disodium salt and graphite oxide is 1.5:1, and the number of layers of the used graphite oxide itself is 7 layers.

[0056] Step (2), surface coating of the positive electrode material of the lithium ion battery: uniformly mix the surface-treated graphite oxide dispersion with the nickel cobalt manganese ternary material of the positive electrode material of the lithium ion battery. The amount of graphite oxide is 1 wt % of the mass of the positive electrode material. The solvent was removed at 150°C to obtain a graphite oxide-coated cathode material for lithium ion batteries.

[0057] The o...

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Abstract

The invention provides a lithium ion battery cathode material coated with graphite oxide modified by a metal complexing agent. By forming a coating layer containing metal complexing agent and graphite oxide on the surface, it can bring about the effects of high coating degree and strong coating fastness, and protect the positive electrode when used in the positive electrode of lithium-ion batteries. The metal complexing agent-modified graphite oxide-coated lithium ion battery cathode material has a simple and easy preparation method, low energy consumption, and is convenient for realizing industrial scale production.

Description

technical field [0001] The invention relates to the field of lithium ion secondary batteries, in particular to a lithium ion battery positive electrode material covered with graphite oxide and a preparation method thereof. [0002] Meanwhile, the invention belongs to the field of graphene materials, and in particular relates to a graphite oxide-coated positive electrode material modified by a metal complexing agent and a preparation method thereof. Background technique [0003] In recent years, research on lithium-ion batteries is in the ascendant. Compared with traditional lead-acid and nickel-metal hydride batteries, lithium-ion batteries have the advantages of light weight, green environmental protection, long life, large capacity and high safety. Commercial cathode materials for lithium ion secondary batteries mainly include lithium cobalt oxide, lithium manganate, lithium iron phosphate and nickel manganese cobalt ternary materials. Compared with lithium cobalt oxide,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48
CPCH01M4/48H01M4/36Y02E60/10
Inventor 杜宁川崎学
Owner TORAY ADVANCED MATERIALS RES LAB CHINA