High-capacity and high-rate composite graphite negative electrode material preparation method

A technology of composite graphite and negative electrode material, applied in the field of preparation of composite graphite negative electrode material, can solve problems such as low capacity, achieve high-rate charge-discharge performance, small rebound of pole piece, and increase the effect of anisotropic distribution.

Active Publication Date: 2019-06-21
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mesophase carbon microspheres have the advantages of high electrode density and high current charge and discharge, but their capacity is low

Method used

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  • High-capacity and high-rate composite graphite negative electrode material preparation method
  • High-capacity and high-rate composite graphite negative electrode material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of this example comprises the following steps:

[0024] (1) A single particle of artificial graphite is first carbonized at a low temperature, and the temperature is generally controlled at 750°C to remove some ash impurities and volatile substances;

[0025] (2), then the artificial graphite after the low-temperature carbonization treatment is carried out by mechanical milling to obtain primary particle A, and the particle diameter D50 is controlled at 9.5 μm;

[0026] (3) Put a green ball of mesophase carbon microspheres into the shaping equipment for surface modification at room temperature for 3 to 7 minutes to make the overall shape more regular and at the same time increase the roughness of the particle surface to obtain mesophase carbon microspheres. Ball raw ball B, the particle size D50 of modified particles is controlled at 15 μm;

[0027] (4), the primary particle A, the mesophase carbon microsphere green ball B, and the asphalt binder...

Embodiment 2

[0031] The preparation method of this example comprises the following steps:

[0032] (1) The single particle of artificial graphite is first carbonized at low temperature, and the temperature is generally controlled at 750°C to remove some ash impurities and volatile substances;

[0033] (2), then the artificial graphite after the low-temperature carbonization treatment is carried out by mechanical milling to obtain primary particle A, and the particle diameter D50 is controlled at 9.5 μm;

[0034] (3) Put a green ball of mesophase carbon microspheres into the shaping equipment for surface modification at room temperature for 3 to 7 minutes to make the overall shape more regular and at the same time increase the roughness of the particle surface to obtain mesophase carbon microspheres. Ball raw ball B, the particle size D50 of modified particles is controlled at 15 μm;

[0035] (4), the primary particle A, the mesophase carbon microsphere green ball B, and the asphalt binder...

Embodiment 3

[0039] The preparation method of this example comprises the following steps:

[0040] (1) A single particle of artificial graphite is first carbonized at a low temperature, and the temperature is generally controlled at 750°C to remove some ash impurities and volatile substances;

[0041] (2), then the artificial graphite after the low-temperature carbonization treatment is carried out by mechanical milling to obtain primary particle A, and the particle diameter D50 is controlled at 9.5 μm;

[0042] (3) Put a green ball of mesophase carbon microspheres into the shaping equipment for surface modification at room temperature for 3 to 7 minutes to make the overall shape more regular and at the same time increase the roughness of the particle surface to obtain mesophase carbon microspheres. Ball raw ball B, the particle size D50 of modified particles is controlled at 15 μm;

[0043] (4) Put the primary particles A, mesophase carbon microsphere green balls B, and pitch binder into...

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Abstract

The invention relates to the technical field of a lithium ion battery negative electrode materials, particularly to a high-capacity and high-rate composite graphite negative electrode material preparation method, which comprises: carrying out low-temperature carbonization on an artificial graphite particle material, crushing to achieve a particle size of 8-11 [mu]m, carrying out room temperature surface modification on the raw ball of mesophase carbon microspheres, mixing the two obtained materials and a binder, carrying out secondary coating modification granulation, and carrying out high temperature graphitization treatment to obtain the high-capacity and high-rate composite graphite negative electrode material. Compared with the material in the prior art, the material of the present invention has the following advantages that the disadvantages of poor rate of artificial graphite and low capacity of mesophase carbon microspheres are overcome, and the prepared product has advantages of high capacity and high rate charge and discharge performance. With the prepared product of the present invention, the single particle and the secondary coated particle are stacked and filled throughthe prepared product, the directional distribution of the particles is increased, the bounce of the electrode sheet is low, rebounds small, the electrolytic solution is smoothly inserted into the carbon and graphite material, and the cycle performance is excellent.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a method for preparing a composite graphite negative electrode material with high capacity and high rate. Background technique [0002] With its advantages of high specific energy, high working voltage, fast charging and discharging, long cycle life, safety and pollution-free, lithium-ion batteries have successfully replaced other secondary batteries and become the preferred choice for small electronic products such as mobile phones, notebook computers and video recorders. It is the main energy source, and has greatly promoted the industrialization process of electric vehicles. Many countries have also fully launched the development of lithium-ion batteries in the military and aerospace fields, which puts forward higher requirements for lithium-ion batteries. [0003] With the development of science and technology, electronic product...

Claims

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Application Information

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IPC IPC(8): C01B32/205C01B32/215H01M4/36H01M4/587H01M10/0525
CPCY02E60/10
Inventor 顾凯丁晓阳南明哲李虹徐赛琴王旭峰汪泽天
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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