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Battery negative electrode material and preparation method thereof

A technology of a battery negative electrode and a manufacturing method, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of difficult control, residual metal impurities, complicated preparation process, etc., so as to achieve the effect of unaffected capacity and improved liquid permeability.

Active Publication Date: 2019-04-05
深圳市金润能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the method provided by this patent is complicated and difficult to control, and the catalyst needs to be removed with sulfuric acid or nitric acid, but it is still possible to leave metal impurities in the negative electrode material

Method used

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  • Battery negative electrode material and preparation method thereof
  • Battery negative electrode material and preparation method thereof
  • Battery negative electrode material and preparation method thereof

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preparation example Construction

[0028] The preparation method of battery negative electrode material provided by the invention comprises the following steps:

[0029] 1. Raw material preparation:

[0030] Raw material 1, natural graphite and / or artificial graphite and / or coke, with an average particle size D50 of 12-25 μm;

[0031] Raw material 2, natural graphite and / or artificial graphite and / or coke, with an average particle size D50 of 2-6 μm;

[0032] Raw material 3, asphalt: average particle size 0.5-3μm. The asphalt can be one or more of petroleum-based and / or coal-based high-temperature asphalt, medium-temperature asphalt, and low-temperature asphalt.

[0033] 2. Premix:

[0034] 1) The above-mentioned raw material 1 and raw material 3 are uniformly mixed according to the mass ratio of 100:1-100:15 to obtain intermediate 1; the mixed raw material 1 and raw material 3 can also be added into 0-10% (mass percentage) graphitization catalyst at the same time , such as silicon carbide and / or iron oxide...

Embodiment 1

[0057] 1. Premix

[0058] 1) Mix natural graphite (average particle size D50 of 17 μm) and high-temperature pitch (average particle size D50 of 3 μm) at a mass ratio of 100:15; at the same time, 3% (mass percentage) graphitization catalyst silicon carbide can be added.

[0059] 2) Mix coke (average particle size D50 is 5 μm) and high-temperature pitch (average particle size D50 is 3 μm) at a mass ratio of 100:1; at the same time, 3% (mass percentage) graphitization catalyst can be added, such as silicon carbide and / or iron oxides.

[0060] 3) Mix the materials obtained in 1) and 2) uniformly at a mass ratio of 100:30 to obtain a mixture;

[0061] 2. Reaction

[0062] 1) The above-mentioned mixture is introduced into a pressure-resistant heating reaction vessel that can be completely sealed and has a stirring function, and N 2 Or replace the air in the reaction vessel with Ar for 1 hour; seal the reaction vessel and start to heat up; raise the temperature to 400°C at a rate ...

Embodiment 2

[0069] 1. Premix

[0070] 1) Mix artificial graphite (average particle size D50 of 17 μm) and high-temperature pitch (average particle size D50 of 3 μm) at a mass ratio of 100:15; at the same time, 3% (mass percentage) graphitization catalyst silicon carbide can be added.

[0071] 2) Mix coke (average particle size D50 is 5 μm) and high-temperature pitch (average particle size D50 is 3 μm) at a mass ratio of 100:1; at the same time, 3% (mass percentage) graphitization catalyst can be added, such as silicon carbide and / or iron oxides.

[0072] 3) Mix the materials obtained in 1) and 2) uniformly at a mass ratio of 100:30 to obtain a mixture;

[0073] 2. Reaction

[0074] 1) The above-mentioned mixture is introduced into a pressure-resistant heating reaction vessel that can be completely sealed and has a stirring function, and N 2 Or replace the air in the reaction vessel with Ar for 1 hour; seal the reaction vessel and start to heat up; raise the temperature to 400°C at a ra...

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Abstract

The invention relates to a battery anode material, comprising first particles and first coating layers coated on the surfaces of the first particles, and second particles and second coating layers coated on the surfaces of the second particles; the second particles are adhered on the surfaces of the first particles; the average grain diameter of the first particles is 12-25 mu, the average grain diameter of the second particles is 2-6 mu, the first particles, the second particles, the first coating layers and the second coating layers are all graphite. The invention also relates a preparation method of the battery anode material. The battery anode material is adhered on the surfaces of the first particles through the second particles with relatively small average grain diameter, contact of the battery anode material and the first particles is increased; function of conductive agent is realized; compared with the conductive agent adding inactive substances, the capacity of the battery anode material of the invention is not influenced; relatively much gaps are kept among the first particles on account of spacing of the first particles, relatively much electrolyte retaining amount is kept, more diffusion channels are provided for the electrolyte.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a negative electrode material and a preparation method of the negative electrode material. Background technique [0002] As the functions of digital products become more and more powerful, and the mileage of electric vehicles becomes longer and longer, the requirements for the energy density of lithium-ion batteries are getting higher and higher. Anode materials are one of the keys to improving the energy density of lithium-ion batteries. From the perspective of the negative electrode, in order to increase the energy density of the battery, the goal is usually achieved by increasing the gram specific capacity of the negative electrode material, the compaction density, and the active material content in the electrode sheet dressing. [0003] At present, the specific capacity of high-end natural graphite and high-end artificial graphite anode materials can reach 365-370mAh / g, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/133H01M4/1393
CPCH01M4/133H01M4/1393H01M4/583Y02E60/10
Inventor 吴泽轶张浩石九菊吴云胜何晓云胡晓东蒋勇明郜长福
Owner 深圳市金润能源材料有限公司
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