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Lithium ion battery anode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as weak binding force of negative electrode material particles, residual metal impurities, complex preparation process, etc., to improve firmness, increase voltage Solid density, the effect of increasing the energy density of the battery

Inactive Publication Date: 2018-03-20
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, these methods all disperse carbon nanotubes and carbon fibers on the surface of the negative electrode material particles, and the binding force with the negative electrode material particles is weak, so the performance improvement is limited.
At the same time, in the negative electrode material prepared by method 1), carbon nanotubes adhere to the surface of the substrate in a physical combination, and its binding force is weak. The method provided by method 2) has a complicated preparation process and is difficult to control. The catalyst needs to be removed by 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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  • Lithium ion battery anode material and preparation method thereof
  • Lithium ion battery anode material and preparation method thereof
  • Lithium ion battery anode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Provide high-temperature coal pitch with an average particle size of 8μm spherical artificial graphite, a carbon fiber with a diameter of about 300nm and a length of about 3-6um, and an average particle size of 3μm;

[0032] (2) The above-mentioned carbon fiber and pitch are mixed uniformly in solid phase at a mass ratio of 30:70, heated to 280°C, stirred for 3 hours, cooled, and pulverized to an average particle size of 20 μm to obtain intermediate material one;

[0033] (3) The above-mentioned artificial graphite and the intermediate material are mixed uniformly in a solid phase with a mass ratio of 80:20 to obtain a mixture;

[0034] (4) Put the mixture in a pressure-resistant heating reaction vessel, stir, pass inert gas to replace the air in the reaction vessel, heat up to 450°C for 2h, then heat up to 650°C for 3h; heat up and keep warm Continuous stirring during the process; then cooling;

[0035] (5) Carbonization, under the protection of inert gas, heat treatment i...

Embodiment 2

[0039] (1) Provide medium temperature petroleum pitch with an average particle size of 8μm spherical natural graphite, a carbon nanotube with a diameter of about 60nm and a length of 1-10μm, and an average particle size of 10μm;

[0040] (2) Ball mill the above-mentioned carbon nanotubes and conductive carbon black in anhydrous ethanol at a mass ratio of 60:40 for 2h, and dry; this step can make the carbon nanotubes easier to disperse in the subsequent steps; it can be understood that anhydrous ethanol is also It can be replaced by other types of solvents such as acetone, aqueous solutions containing dispersants, and the like.

[0041] (3) Mix the mixture of carbon nanotubes and conductive carbon black with the above pitch at a mass ratio of 30:70 in solid phase, heat to 150°C, stir for 3 hours, cool, and pulverize to an average particle size of 50μm. Material one

[0042] (4) The above-mentioned natural graphite and the intermediate material are mixed uniformly in a solid phase wit...

Embodiment 3

[0048] (1) Provide spherical coke with an average particle size of 6μm, graphene with a thickness of about 8nm, and high-temperature coal pitch with an average particle size of 3μm;

[0049] (2) The above-mentioned graphene, pitch and silicon carbide are mixed uniformly in a solid phase at a mass ratio of 46:46:8, heated to 280°C, stirred for 3 hours, cooled, and pulverized to an average particle size of 5μm to obtain intermediate material one; Silicon carbide as a graphitizing agent can also be replaced by iron oxide, titanium oxide and other types or used together;

[0050] (3) Mix the coke and the intermediate material in a solid phase with a mass ratio of 90:10 to obtain a mixture;

[0051] (4) Put the mixture in a pressure-resistant heating reaction vessel, stir, pass inert gas to replace the air in the reaction vessel, heat up to 450°C for 2h, then heat up to 650°C for 3h; heat up and keep warm Continuous stirring during the process; then cooling;

[0052] (5) Carbonization, un...

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Abstract

The invention relates to a lithium ion battery anode material and a preparation method thereof. The lithium ion battery anode material comprises a graphite body and a submicron or nanoscale one-dimensional and / or two-dimensional carbon material, wherein the graphite body is aggregate formed through primary particle aggregation, at least part of the carbon material is combined among primary particles, and at least part of the carbon material combined among the primary particles extends outside a bulk phase of the graphite body. In the provided lithium ion battery anode material and the preparation method thereof, the carbon material and the graphite body are combined more firmly and are dispersed more uniformly, play of energy of a core of the graphite body can be beneficially promoted, andhigh current charge-discharge capability of a lithium ion battery is greatly improved.

Description

Technical field [0001] The present 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] With the development of digital products and electric vehicles, the use of lithium-ion batteries has become more and more widespread. For the performance of lithium-ion batteries, the anode material is one of the key factors to improve the overall performance of the battery. In the normal charging and discharging process of lithium-ion batteries, lithium ions and electrons are required to participate together. This requires that the electrodes of lithium-ion batteries must be a mixed conductor of ions and electrons, and electrode reactions can only occur in the electrolyte, conductive agent, The junction of active materials. However, in fact, the conductivity of the anode and cathode materials of lithium-ion batteries is not satisfactory. Although the condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/1393H01M10/0525
CPCH01M4/1393H01M4/362H01M4/583H01M10/0525Y02E60/10
Inventor 吴泽轶蒋勇明胡晓东张浩吴云胜何晓云石九菊
Owner 深圳市金润能源材料有限公司
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