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Graphite negative electrode material and preparation method and application thereof

A graphite anode, natural graphite technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of reducing the energy density of graphite composite materials, requiring high temperature and high pressure equipment, and deteriorating battery cycle performance. Chemical stability, simple and feasible method, effect of improving gram capacity and energy density

Pending Publication Date: 2022-03-18
HUNAN SHINZOOM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is not only costly, but requires high temperature and high pressure equipment, which is not conducive to industrialization, and this method cannot achieve uniform filling in the interior of natural graphite. At the same time, this method crushes and classifies the material after heat treatment in an inert atmosphere, which is likely to cause soft carbon inclusions. The coating peels off, which leads to the exposure of natural graphite, which leads to poor cycle performance of the battery; and the gram capacity of the pitch coated inside and on the surface of natural graphite after graphitization is low, which reduces the energy density of graphite composite materials

Method used

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  • Graphite negative electrode material and preparation method and application thereof
  • Graphite negative electrode material and preparation method and application thereof
  • Graphite negative electrode material and preparation method and application thereof

Examples

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preparation example Construction

[0032] In order to solve the technical problems such as the poor cycle performance of existing graphite negative electrode materials and the capacity to be improved, the invention provides a preparation method of graphite negative electrode materials, comprising the following steps:

[0033] S1. Mix the catalyst with the binder 1, place the obtained mixture under an inert atmosphere or vacuum condition, raise the temperature to 100-300°C, keep it warm for 2-4 hours, cool to room temperature, and crush to obtain the coated binder 1 Particle A of the catalyst, the particle A is close to the particle size of the catalyst;

[0034] S2. Mix the catalyst particle A coated with the binder 1 and flake graphite to obtain a mixture X, and the mixture X is spheroidized to obtain spherical natural graphite particles B, which are filled with coated Catalyst particle A of binder 1;

[0035] S3. Mix the spherical natural graphite particles B obtained in step S2 with the binder 2 to obtain a...

Embodiment 1

[0049] A preparation method of the graphite negative electrode material of the present embodiment, its preparation process is as follows figure 1 shown, including the following steps:

[0050] (1) the average particle diameter is 3 μ m of SiC and the average particle diameter is 3 μ m of petroleum asphalt mixing, the mass percentage of petroleum pitch is 30%, the mass percentage of SiC is 70%, the mixture is packed in the container, will house The container of the mixture was placed in a carbonization furnace, and the temperature was raised to 250°C at a rate of 3°C / min under a nitrogen atmosphere, kept for 2 hours, and then the temperature was naturally lowered to crush the material. The particle size after crushing was 3.2 μm.

[0051] (2) SiC coated with petroleum pitch and flake graphite with an average particle size of 35 μm are mixed evenly. The SiC coated with graphite pitch is 20% of the total mass of SiC and graphite flakes coated with petroleum pitch. The mixture is ...

Embodiment 2

[0071] A preparation method of a graphite negative electrode material is basically the same as in Example 1, the only difference being that in the step (1) of Example 2, the mass percent of petroleum pitch is 15%, and the mass percent of SiC is 85%.

[0072] The graphite negative electrode material prepared by this method was made into a button battery and a full battery according to the method in Example 1, and the electrochemical performance results are shown in Table 1.

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Abstract

The invention provides a preparation method of a graphite negative electrode material, which comprises the following steps: S1, mixing a catalyst and a binder, heating and preserving heat in an inert atmosphere or a vacuum condition, cooling to room temperature, and crushing; s2, mixing the substance obtained in the step S1 with crystalline flake graphite, and carrying out spheroidizing treatment to obtain spherical natural graphite particles; s3, mixing the obtained spherical natural graphite particles with a binder, rotating and heating the obtained mixture at the same time, cooling and discharging; and S4, performing high-temperature graphitization demagnetization screening to obtain the graphite negative electrode material. The invention also provides the graphite negative electrode material prepared by the method and application thereof. The method is low in cost, easy to implement and suitable for large-scale production, the performance of the graphite negative electrode material product can be accurately controlled, and the prepared graphite negative electrode material is high in capacity, good in compatibility with electrolyte, good in cycle performance and high in energy density.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and relates to a graphite negative electrode material and a preparation method and application thereof. 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 anode materials for 3C electronic products and have been widely used, and gradually expanded to electric vehicles (EV) and hybrid 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] Natural graphite is widely used because of its hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 张旱雨徐帅王玉华胡孔明王志勇皮涛
Owner HUNAN SHINZOOM TECH
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