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Graphite negative electrode material used for power lithium ion battery and preparation method and application of graphite negative electrode material

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

Active Publication Date: 2017-05-10
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 used for power lithium ion battery and preparation method and application of graphite negative electrode material
  • Graphite negative electrode material used for power lithium ion battery and preparation method and application of graphite negative electrode material
  • Graphite negative electrode material used for power lithium ion battery and preparation method and application of graphite negative electrode material

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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 follows: figure 1 shown.

[0030] Step 110: Mix the carbon material with an average particle size of 5 to 30 μm and the asphalt powder uniformly in a weight ratio of 100:0.1 to 25, and use a horizontal granulation kettle to granulate, and in a nitrogen atmosphere from room temperature at 2 °C / min The heating rate of ~5°C / min is heated to 500°C to 1000°C, and the temperature is kept for 0.5 hour to 6 hours and then lowered to room temperature to obtain granulated material;

[0031] Wherein, the carbon material includes one or more of graphitized mesocarbon microspheres, petroleum coke, pitch coke, needle coke or coke; the pitch includes one or more mixtures of low temperature pitch, medium temperature pitch or high temperature pitch ; The polymer includes one or more mixtures of phen...

Embodiment 2

[0047] Step 1: Mix petroleum coke with an average particle size of 11 μm and medium-temperature asphalt 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. Raised from room temperature to 800°C, kept for 2 hours, and then lowered to room temperature to obtain granulated material;

[0048] Step 2: The granulated material is crushed and classified by a shaping classifier to obtain a shaping material with an average particle size of 14um;

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

[0050] Step 4: Disperse the obtained purified graphitized material and phenolic resin powder evenly in water containing CMC anti-precipitant to form a stable suspens...

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 anti-precipitation agent to fo...

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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 power lithium ion batteries and a preparation method and application thereof. Background technique [0002] Today, oil and coal resources are becoming increasingly scarce, and environmental problems such as greenhouse gases and smog are becoming more and more serious. Governments around the world call for energy conservation and emission reduction, and actively encourage the purchase of small-displacement vehicles or pure green electric vehicles in the choice of means of transportation. At present, the shortcomings of electric vehicles are short driving range and slow charging, and these shortcomings mainly point to the need to improve the battery performance of electric vehicles. The driving range of an electric vehicle is limited by the capacity of the battery, and the factors affecting the capacity of the battery include the choice ...

Claims

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Application Information

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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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