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 vi

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
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Effect test

Example Embodiment

[0029] Example 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 is placed in a tube furnace, and the temperature is raised to 200° C. at 3° C. / min at a constant temperature for 3 hours in an air atmosphere. After cooling, VC is mixed with coal tar pitch to form a homogeneous material. The mass ratio of coal tar pitch in the mixture is 40%. The mixture is added 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 a nitrogen atmosphere for carbonization, and the temperature was raised to 800°C at 3°C / min, and the temperature was kept constant for 3 hours. After carbonization, the particles are sieved, and the undersize is 10.8μm graphite anode material.

[0031] The button cell was prepared by the same method as the comparative example for ...

Example Embodiment

[0032] Example 2

[0033] The micro-expanded natural graphite with an average particle size of 10.1 μm and a volume expansion ratio of 1.5 times is placed in a tube furnace, and the temperature is raised to 600° C. at 2° C. / min at a constant temperature for 3 hours in an air atmosphere. After cooling, VC is mixed with petroleum pitch to form a homogeneous material. The mass ratio of coal pitch in the mixture is 10%. The mixture is added 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 gas for carbonization, and the temperature was raised to 950°C at 2°C / min, and the temperature was kept constant for 3h. After carbonization, the particles are sieved, and the undersize is 17.6μm graphite anode material.

[0034] The button cell was prepared by the same method as the comparative example for electrochemical performance test. The first ...

Example Embodiment

[0035] Example 3

[0036] The micro-expanded natural graphite with an average particle size of 8.0 μm and a volume expansion ratio of 1.5 times is placed in a tube furnace, and the temperature is raised to 1000° C. at 5° C. / min at a temperature of 5° C. / min for 3 hours in a nitrogen atmosphere. After cooling, it is Y-mixed with phenolic resin and mixed into a uniform material. The mass ratio of phenolic resin in the mixture is 15%. The mixture is added 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 is placed in a carbonization furnace filled with argon atmosphere for carbonization, and the temperature is raised to 1200°C at 5°C / min, and the temperature is kept constant for 4h. After carbonization, the particles are sieved, and the under-sieve is 10.5 μm graphite anode material.

[0037] The button cell was prepared by the same method as the comparative example for electrochemical perfo...

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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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