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Preparation method of a nitrogen-enriched hierarchical structure natural graphite composite electrode material

A natural graphite and hierarchical structure technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of poor structural stability and high preparation temperature, and achieve the effects of improving surface polarity, excellent material performance, and low energy consumption

Active Publication Date: 2017-04-19
百吉瑞(天津)新能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the common defects of poor structural stability and high preparation temperature in graphite negative electrode materials prepared by existing methods, and provide a new preparation method for lithium ion battery negative electrode materials. The obtained negative electrode materials have the advantages of low preparation temperature , good reversibility of charge and discharge reaction, excellent cycle performance, high chemical reactivity, high product cost performance, simple preparation process conditions and many other advantages

Method used

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  • Preparation method of a nitrogen-enriched hierarchical structure natural graphite composite electrode material

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Embodiment 1

[0027] A method for preparing a nitrogen-enriched hierarchical structure natural graphite composite electrode material, the steps of which are as follows:

[0028] Mix the treated natural flake graphite, emulsified pitch, and melamine in a mass ratio of 73%: 15%: 12%, add dehydrated alcohol and deionized water (the volume ratio of dehydrated alcohol and deionized water is 1:1), Mix until the volume percentage of insoluble solids is 75%, then add it into a V-shaped mixer and mix for 30 minutes, the speed is set at 50 rpm, and then spray dry. Gained product is under argon atmosphere (argon flow rate is 40cm 3 / min) from room temperature to 800°C at a rate of 5°C / min and keep at 800°C for 10 hours, after cooling, process it in a high-speed vibrating ball mill for 4 hours, the frequency of the high-speed vibrating ball mill is 45Hz, and pass through a 200-mesh sieve After that, a nitrogen-rich hierarchical structure natural graphite composite material is obtained.

Embodiment 2

[0030] A method for preparing a nitrogen-enriched hierarchical structure natural graphite composite electrode material, the steps of which are as follows:

[0031] Mix the treated natural flake graphite, emulsified pitch, and melamine in a mass ratio of 73%: 15%: 12%, add dehydrated alcohol and deionized water (the volume ratio of dehydrated alcohol and deionized water is 1:1), Mix until the volume percentage of insoluble solids is 75%, then add it into a V-shaped mixer and mix for 30 minutes, the speed is set at 50 rpm, and then spray dry. Gained product is under argon atmosphere (argon flow rate is 40cm 3 / min) From room temperature to 900°C at a rate of 5°C / min and keep at 900°C for 10 hours, after cooling, process it in a high-speed vibrating ball mill for 4 hours, the frequency of the high-speed vibrating ball mill is 45Hz, and pass through a 200-mesh sieve After that, a nitrogen-rich hierarchical structure natural graphite composite material is obtained.

Embodiment 3

[0033]A method for preparing a nitrogen-enriched hierarchical structure natural graphite composite electrode material, the steps of which are as follows:

[0034] Mix the treated natural flake graphite, emulsified pitch, and melamine in a mass ratio of 73%: 15%: 12%, add dehydrated alcohol and deionized water (the volume ratio of dehydrated alcohol and deionized water is 1:1), Mix until the volume percentage of insoluble solids is 75%, then add it into a V-shaped mixer and mix for 30 minutes, the speed is set at 50 rpm, and then spray dry. Gained product is under argon atmosphere (argon flow rate is 40cm 3 / min) From room temperature to 1000°C at a rate of 5°C / min and keep at 1000°C for 10 hours, after cooling, process it in a high-speed vibrating ball mill for 4 hours, the frequency of the high-speed vibrating ball mill is 45Hz, and pass through a 200-mesh sieve After that, a nitrogen-rich hierarchical structure natural graphite composite material is obtained.

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Abstract

The invention belongs to the technical field of preparation of lithium ion battery electrode materials and particularly discloses a preparation method for a nitrogen-enriched type graded structure natural graphite composite electrode material. The method comprises the following steps: firstly, carrying out spheroidizing on natural flake graphite; uniformly mixing the treated natural graphite, emulsified asphalt and melamine in am ethanol / water solution in a certain mass ratio; spraying and drying, and then directly carrying out heat treatment; and carrying out ball milling and sieving to obtain the nitrogen-enriched type graded structure natural graphite composite electrode material. According to the preparation method, a preparation process has the characteristics of low preparation temperature, simple process and low price; a special performance shown by nitrogen doping is utilized on the design of materials, and hard carbon and soft carbon are organically combined to generate the graded structure composite material with abundant pore channels. The prepared material has a plurality of advantages of high charging / discharging efficiency, good reversibility of charging / discharging reaction, excellent circulating performance, no toxic side effect and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery electrode materials, in particular to a preparation method of a nitrogen-rich hierarchical structure natural graphite composite electrode material. Background technique [0002] With the global energy crisis and environmental protection issues becoming increasingly prominent, the development and utilization of new energy materials has become the primary task to achieve sustainable energy development. As a new generation of green and environmentally friendly batteries, lithium-ion batteries have the characteristics of high voltage, large specific capacity, and environmental protection. They have become new energy storage materials to solve the "energy crisis" and "environmental crisis", and are of great significance to the sustainable development of energy. . With the rapid development of electric vehicles and other electronic devices, the demand for lithium-ion batterie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 薛凌云王志伟金洪伟刘浩洋丁瑜王锋肖迎波
Owner 百吉瑞(天津)新能源有限公司