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Preparation method of composite modified graphite cathode material, composite modified graphite cathode material and application

A graphite negative electrode and composite modification technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor rate performance and cycle efficiency of graphite negative electrode materials, and reduce the irreversible capacity of graphite negative electrode materials. Effects of reducing irreversible capacity, increasing reversible capacity, and reducing effective area

Inactive Publication Date: 2017-12-29
NORTHERN ALTAIR NANOTECH CO LTD +1
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AI Technical Summary

Problems solved by technology

[0006] The first object of the present invention is to provide a kind of preparation method of composite modified graphite negative electrode material, and this preparation method is to adopt phenolic resin mixed solution to modify graphite intercalation compound, wherein, phenolic resin mixed solution is mainly composed of phenolic resin, Composed of phosphorus compounds and water, this preparation method can improve the traditional preparation method of modifying graphite by using phenolic resin aqueous solution to reduce the irreversible capacity of graphite negative electrode materials, improve the rate performance and cycle efficiency of graphite negative electrode materials.

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  • Preparation method of composite modified graphite cathode material, composite modified graphite cathode material and application
  • Preparation method of composite modified graphite cathode material, composite modified graphite cathode material and application
  • Preparation method of composite modified graphite cathode material, composite modified graphite cathode material and application

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preparation example Construction

[0044] In order to improve the above problems, according to one aspect of the present invention, a method for preparing a composite modified graphite negative electrode material is provided, comprising the following steps:

[0045] mixing the graphite intercalation compound and the phenolic resin mixed solution, drying, and sintering to obtain a composite modified graphite negative electrode material;

[0046] Wherein, the phenolic resin mixed solution mainly includes phenolic resin, phosphorus compound and water.

[0047]The invention provides a preparation method of a composite modified graphite negative electrode material, mainly using a phenolic resin mixed solution to coat and modify a graphite intercalation compound, wherein the graphite intercalation compound is mixed with graphite, an oxidant, and an intercalation agent The oxidation intercalation reaction is carried out, and the phenolic resin mixed solution is mainly composed of phenolic resin, phosphorus compound an...

Embodiment approach

[0082] As a preferred embodiment of the present invention, the preparation method of composite modified graphite negative electrode material comprises the following steps:

[0083] (a) graphite is mixed with oxidant and intercalation agent to carry out oxidative intercalation reaction, and dried to obtain graphite intercalation compound;

[0084] (b) mix and stir the mixed solution of graphite intercalation compound and phenolic resin according to the mass ratio of 1:(7-12) for 1-3h, spray dry, and sinter at 400-800°C for 1-5h to obtain a composite modified graphite negative electrode material ;

[0085] Wherein, the phenolic resin mixed solution mainly includes phenolic resin, phosphoric acid and water, and the mass ratio of phenolic resin, phosphoric acid and water is 1:(4-6):(7-11).

[0086] By limiting the specific process parameters in the preparation method, the coating of the phosphorus-doped carbon coating on the graphite surface is more complete, uniform and firm, re...

Embodiment 1

[0104] A preparation method of composite modified graphite negative electrode material, comprising the following steps:

[0105] (a) Add graphite to the mixed solution of oxidant and intercalant, add the above mixed solution into a water bath, control the temperature of the water bath to about 30°C, stir for 2 hours, and dry at a temperature of 105°C to obtain graphite Intercalation compounds;

[0106] Wherein, the oxidizing agent is formic acid, the intercalating agent is concentrated sulfuric acid, and the mass ratio of graphite, oxidizing agent and intercalating agent is 1:0.2:2.

[0107] (b) The mixed solution of graphite intercalation compound and phenolic resin was mixed and stirred for 2 hours according to the mass ratio of 1:9, spray-dried, sintered at 500°C for 3 hours under a nitrogen atmosphere, and passed through a 200-mesh sieve after grinding to obtain a composite modified graphite negative electrode material ;

[0108] Among them, the phenolic resin mixed solu...

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Abstract

The invention provides a preparation method of a composite modified graphite cathode material, the composite modified graphite cathode material and an application and relates to the technical field of graphite cathode materials. According to the method, a graphite intercalation compound is subjected to coating modification through a phenolic resin mixed solution, wherein the phenolic resin mixed solution is mainly prepared from phenolic resin, a phosphorus compound and water. Different from graphite, the graphite intercalation compound can enlarge the interplanar spacing of graphite and increase the Lithium storage capacity, so that the reversible capacity is increased; besides, a phosphorus-doped carbon coating layer can increase the compactness of the composite modified graphite cathode material and further improve the rate capability of the material; besides, the phosphorus-doped carbon coating layer can uniformly and completely coat the surface of the graphite intercalation compound, the irreversible capacity is reduced, and accordingly, the circulation efficiency is improved. The invention also provides the composite modified graphite cathode material prepared with the preparation method of the composite modified graphite cathode material.

Description

technical field [0001] The invention relates to the technical field of graphite negative electrode materials, in particular to a preparation method of a composite modified graphite negative electrode material, a composite modified graphite negative electrode material and applications. Background technique [0002] Lithium-ion batteries prepared with carbon materials as negative electrode materials have shown certain safety and stability performance, so the research on carbon materials has attracted the attention of researchers from various countries. Carbon materials mainly include graphite carbon materials, non-graphite carbon materials, doped carbon materials, and coated carbon materials. Among the many carbon anode materials, graphite has rapidly attracted widespread attention due to its rich resources, low price, high reversible capacity, low charge and discharge voltage platform, no voltage hysteresis, and excellent conductivity. There are not a few researches and appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 杨王科白岩成信刚马书良
Owner NORTHERN ALTAIR NANOTECH CO LTD
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