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Graphite negative electrode material for power lithium ion battery and its preparation method and application

A lithium-ion battery and graphite negative electrode technology, applied in the field of materials, can solve problems such as poor electrolyte compatibility, large irreversible capacity loss, and inability to meet power lithium ions, so as to improve the first charge and discharge efficiency and compatibility , the effect of increasing capacity

Active Publication Date: 2019-03-22
溧阳紫宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, natural graphite particles are anisotropic and have poor compatibility with the electrolyte. The irreversible capacity loss is large during the first charge and discharge process, especially for microcrystalline graphite with a large specific surface area.
Compared with natural graphite, although artificial graphite can achieve isotropy, and the electrical properties such as capacity and first effect have been improved, it still cannot meet the needs of high-rate and fast charging of power lithium-ion batteries.

Method used

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  • Graphite negative electrode material for power lithium ion battery and its preparation method and application
  • Graphite negative electrode material for power lithium ion battery and its preparation method and application
  • Graphite negative electrode material for power lithium ion battery and its preparation method and application

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Embodiment 1

[0029] Embodiment 1 of the present invention provides a method for preparing a graphite negative electrode material for a power lithium-ion battery, comprising the following steps, specifically as figure 1 shown.

[0030] Step 110, uniformly mix carbon materials with an average particle size of 5-30 μm and pitch powder in a weight ratio of 100:0.1-25, use a horizontal granulation kettle to granulate, and granulate at room temperature at 2°C / min in a nitrogen atmosphere. Raise the temperature to 500-1000°C at a heating rate of ~5°C / min, keep it warm for 0.5-6 hours and then lower it to room temperature to obtain pellets;

[0031] Among them, the carbon material includes one or more of graphitized mesophase carbon microspheres, petroleum coke, pitch coke, needle coke or coke; the pitch includes one or more of low-temperature pitch, medium-temperature pitch or high-temperature pitch ; The polymer includes one or more mixtures of phenolic resin, polyvinylidene fluoride, polypyrro...

Embodiment 2

[0047] Step 1: Mix petroleum coke with an average particle size of 11 μm and medium-temperature pitch powder in a weight ratio of 100:9, and then use a horizontal granulation kettle for granulation. The heating rate of the granulation kettle is 5°C / min. Raise from room temperature to 800°C, keep warm for 2 hours, and then lower to room temperature to obtain granulated material;

[0048] Step 2: Pass the granulated material through a shaping classifier for crushing and grading treatment to obtain a granulated material with an average particle size of 14um;

[0049] Step 3: Mix the shaping material and asphalt uniformly at a ratio of 100:5. The asphalt is composed of 60% low-temperature asphalt and 40% high-temperature asphalt, and then use the ventilated graphitization process at 2000°C to obtain a purified graphitized material;

[0050] Step 4: Disperse the obtained purified graphitized material and phenolic resin powder evenly in water containing CMC-Na anti-precipitating agent...

Embodiment 3

[0054] Step 1: Mix the carbon material with an average particle size of 5 μm and the high-temperature pitch powder in a weight ratio of 100:16. The carbon material is composed of 20% petroleum coke and 80% pitch coke, and then use a horizontal granulation kettle to granulate. The heating rate of the granulation kettle was 4°C / min, and it was raised from room temperature to 1000°C in a nitrogen atmosphere, kept for 6 hours, and then lowered to room temperature to obtain granulated materials;

[0055] Step 2: Pass the granulated material through a shaping classifier for crushing and grading treatment to obtain a granulated material with an average particle size of 17um;

[0056] Step 3: Directly treat the reshaping material at 3300°C with a ventilated graphitization process to obtain a purified graphitized material;

[0057] Step 4: Disperse the obtained purified graphitized material and polyvinylidene fluoride powder evenly in water containing CMC-Na anti-precipitation agent to...

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Abstract

The invention discloses a graphite negative electrode material used for a power lithium ion battery and a preparation method and an application of the graphite negative electrode material. The preparation method comprises the steps of uniformly mixing a carbon material and asphalt powder at a weight ratio of 100 to (0.1-25), and performing pelleting to obtain a pelleting material; performing smashing and grading processing on the pelleting material to obtain a shaping material; uniformly mixing the shaping material and asphalt at a ratio of 100 to (0-10), and performing graphitization processing at a temperature of 2,000-3,300 DEG C to obtain purified graphitized material; uniformly dispersing the purified graphitized material and polymer powder in CMC-containing water, and performing spraying and drying on a formed suspension liquid, wherein the weight ratio of the purified graphitized material to polymer powder is 100 to (1-10), and the weight ratio of the purified graphitized material to CMC is 100 to (0.5-3); and performing carbonization processing at a temperature of 1,000-1,300 DEG C, and cooling and sieving to obtain the graphite negative electrode material.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a graphite negative electrode material for a power lithium ion battery, a preparation method and application thereof. Background technique [0002] Today's oil and coal resources are increasingly scarce, and environmental problems such as greenhouse gases and smog are becoming more and more serious. Governments of various countries call for energy conservation and emission reduction, and actively encourage the purchase of small-emission vehicles or pure green electric vehicles in the choice of transportation. At present, the shortcomings of electric vehicles are short driving range and slow charging, and these shortcomings mainly point to the battery performance of electric vehicles that needs to be improved. The driving range of electric vehicles is limited by the capacity of the battery, and the factors that affect the capacity of the battery include the selection of material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/62H01M4/36H01M10/0525
CPCH01M4/366H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 李春顾华清李辉古立虎张志清刘芳冯苏宁陈卫
Owner 溧阳紫宸新材料科技有限公司
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