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Preparation method of graphite anode material

A graphite anode, natural graphite technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of reduced vibration, rough surface morphology of graphite, unfavorable anode slurry processing, etc., to improve dynamic performance , Solve the effect of rough surface morphology, which is conducive to uniform bonding

Inactive Publication Date: 2019-05-10
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after layer expansion, the surface morphology of graphite will become rough, and the vibration will also decrease, which is not conducive to the processing of negative electrode slurry

Method used

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  • Preparation method of graphite anode material
  • Preparation method of graphite anode material
  • Preparation method of graphite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, the micro-expanded natural graphite with an average particle size of 5 μm and a volume expansion multiple of 2 times was placed in a tube furnace, and the temperature was raised to 200 °C at 3 °C / min in an air atmosphere, and the temperature was kept constant for 3 hours. After cooling, mix VC with coal tar pitch to form a uniform material. The mass ratio of coal tar pitch in the mixture is 40%. Add the mixture to the stirring / heating device, the heating temperature is 300°C-650°C, and the constant temperature time is 2-8 hours. Then the cooled sample was placed in a carbonization furnace filled with nitrogen atmosphere for carbonization, the temperature was raised to 800°C at 3°C / min, and the temperature was kept constant for 3h. After carbonization, the particles are sieved, and the undersieve is the graphite negative electrode material with a diameter of 10.8 μm.

[0031] The same method as the comparative example was used to prepare the ...

Embodiment 2

[0033] Micro-expanded natural graphite with an average particle size of 10.1 μm and a volume expansion multiple of 1.5 times was placed in a tube furnace, and in an air atmosphere, the temperature was raised to 600 °C at 2 °C / min and kept at a constant temperature for 3 hours. After cooling, mix VC with petroleum asphalt to form a uniform material, and the mass ratio of coal tar pitch in the mixture is 10%. Add the mixture to the stirring / heating device, the heating temperature is 300°C-650°C, and the constant temperature time is 2-8 hours. Then the cooled sample was placed in a carbonization furnace filled with helium atmosphere for carbonization, the temperature was raised to 950°C at 2°C / min, and the temperature was kept constant for 3h. After carbonization, the particles were sieved, and the undersieve was the graphite negative electrode material with a diameter of 17.6 μm.

[0034] The button battery was prepared by the same method as the comparative example for electroc...

Embodiment 3

[0036]Micro-expanded natural graphite with an average particle size of 8.0 μm and a volume expansion multiple of 1.5 times was placed in a tube furnace, and the temperature was raised to 1000 °C at 5 °C / min under a nitrogen atmosphere, and the temperature was kept constant for 3 hours. After cooling, carry out Y-shape mixing with phenolic resin to form a homogeneous material, and the mass ratio of phenolic resin in the mixture is 15%. Add the mixture to the stirring / heating device, the heating temperature is 300°C-650°C, and the constant temperature time is 2-8 hours. Then the cooled sample was placed in a carbonization furnace filled with argon atmosphere for carbonization, and the temperature was raised to 1200°C at 5°C / min, and the temperature was kept constant for 4h. After carbonization, the particles are sieved, and the undersieve is the graphite negative electrode material with a diameter of 10.5 μm.

[0037] The same method as the comparative example was used to prepa...

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Abstract

The invention provides a preparation method of a graphite anode material. The preparation method comprises the following steps: firstly performing heat treatment on slightly layer-expanded natural graphite, then mixing the slightly layer-expanded natural graphite subjected to the heat treatment with a binder, performing kneading and pelletizing on mixture, and then carbonizing and screening in aninert atmosphere, so that the graphite anode material is obtained. The preparation method provided by the invention solves the problems that surface morphology of graphite becomes rough after layer expansion in the prior art, tap density is reduced and processing of anode slurry is not facilitated.

Description

technical field [0001] The invention relates to the technical field of preparation and application of lithium ion battery negative electrode materials, in particular to a preparation method of graphite negative electrode materials. Background technique [0002] Carbon materials have the advantages of high capacity, good reversibility of intercalation / delithiation, low potential platform, and excellent cycle performance. They are the main negative electrode materials for 3C electronic products and have been widely used, and gradually expanded to electric vehicles (EV) and hybrids. Power supply for electric vehicles (HEV). Therefore, it is crucial to develop and apply high-performance electrode materials. At present, lithium-ion batteries mainly use graphite materials as negative electrode materials. Traditional graphite-based negative electrode materials have problems such as poor cycle and poor rate performance during their cycle. [0003] Lithium ions can only be inserted...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCY02E60/10
Inventor 张旱雨王志勇皮涛邵浩明余梦泽
Owner HUNAN SHINZOOM TECH
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