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Graphite cathode material modified by epoxy resin and its preparation method

A technology of epoxy resin and negative electrode materials, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve problems such as unsatisfactory, and achieve the effects of prolonging cycle life and improving poor cycle stability

Inactive Publication Date: 2014-03-19
成都兴能新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional carbon-based negative electrode materials can no longer meet the needs of the next generation of new lithium-ion battery negative electrode materials in terms of specific capacity and specific energy. Therefore, it is of great significance to develop new carbon-based negative electrode materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A negative electrode material of epoxy resin modified graphite, characterized in that the negative electrode material is coated with epoxy resin on natural graphite, forming an amorphous carbon coating layer on the surface of natural graphite, and the epoxy resin It is silicone modified epoxy resin. Prepared by the following steps:

[0019] (1) Mix and grind epoxy resin and natural graphite in proportion, and obtain mixture A after pressure molding;

[0020] (2) Heat and cure the mixture A, the curing temperature is 200°C, the curing time is 2 hours, and the curing needs to be carried out under the protection of nitrogen to obtain the mixture B;

[0021] (3) The mixture B is heated and carbonized, the carbonization temperature is 700°C, and the carbonization time is 1h. The carbonization needs to be carried out under the protection of nitrogen to obtain the mixture C;

[0022] (4) After cooling the mixture C, crush it to a particle size of 5-10 μm to obtain the ne...

Embodiment 2

[0024] A negative electrode material of epoxy resin modified graphite, characterized in that the negative electrode material is coated with epoxy resin on natural graphite, forming an amorphous carbon coating layer on the surface of natural graphite, and the epoxy resin It is silicone modified epoxy resin. Prepared by the following steps:

[0025] (1) Mix and grind epoxy resin and natural graphite in proportion, and obtain mixture A after pressure molding;

[0026] (2) Heat and cure the mixture A, the curing temperature is 250°C, the curing time is 1h, and the curing needs to be carried out under the protection of nitrogen to obtain the mixture B;

[0027] (3) The mixture B is heated and carbonized, the carbonization temperature is 300°C, and the carbonization time is 5h. The carbonization needs to be carried out under the protection of nitrogen to obtain the mixture C;

[0028] (4) After cooling the mixture C, crush it to a particle size of 10-20 μm to obtain the negati...

Embodiment 3

[0030] A negative electrode material of epoxy resin modified graphite, characterized in that the negative electrode material is coated with epoxy resin on natural graphite, forming an amorphous carbon coating layer on the surface of natural graphite, and the epoxy resin It is silicone modified epoxy resin. Prepared by the following steps:

[0031] (1) Mix and grind epoxy resin and natural graphite in proportion, and obtain mixture A after pressure molding;

[0032] (2) Heat and cure the mixture A, the curing temperature is 220°C, the curing time is 1.5h, and the curing needs to be carried out under the protection of nitrogen to obtain the mixture B;

[0033] (3) Heat and carbonize the mixture B, the carbonization temperature is 500°C, the carbonization time is 2h, and the carbonization needs to be carried out under the protection of nitrogen to obtain the mixture C;

[0034] (4) After cooling the mixture C, crush it to a particle size of 5-15 μm to obtain the negative el...

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Abstract

The invention provides a graphite cathode material modified by epoxy resin and its preparation method, which belong to the chemical cell field. According to the invention, an organosilicon modification epoxy resin and natural graphite are performed with processes of grinding, solidifying, charing and crushing to obtain the graphite cathode material modified by epoxy resin. An epoxy resin carbon membrane coated on the surface of graphite can prevent co-intercalation of large volume solvent molecules, so that a graphite layer can expand and contract in a reversible mode in a small scope, rapid collapse can not be generated, and thereby the cycle life of the graphite cathode is prolonged.

Description

[0001] technical field [0002] The invention belongs to the field of chemical batteries, in particular to a negative electrode material of epoxy resin modified graphite and a preparation method thereof. Background technique [0003] Natural graphite is widely used as the negative electrode material of lithium-ion batteries, but the compatibility between natural graphite and electrolyte is poor, and the graphite layer is prone to peeling off during the intercalation / delithiation process, resulting in a decrease in cycle performance, thus limiting the use of pure natural graphite. Application of Ink in Li-ion Batteries. [0004] With the widespread popularization and development of various small portable electronic products and electric bicycles, the commercial development of a new generation of electric vehicles (EV) and hybrid electric vehicles (HEV) has put forward higher requirements for the energy density and performance of lithium-ion batteries. Require. Traditional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/587H01M4/628Y02E60/10
Inventor 王维利范未峰
Owner 成都兴能新材料股份有限公司
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