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Hard carbon negative electrode material, lithium ion battery as well as preparation method and application of hard carbon negative electrode material

A negative electrode material, hard carbon technology, applied in the direction of carbon preparation/purification, negative electrode, battery electrode, etc., can solve the problems of low reversible capacity and low initial Coulombic efficiency

Active Publication Date: 2021-04-13
SHANGHAI SHANSHAN TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of hard carbon negative electrode materials in the prior art, such as low reversible capacity and low first-time Coulombic efficiency, and provide a hard carbon Negative electrode material, lithium ion battery, preparation method and application thereof

Method used

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  • Hard carbon negative electrode material, lithium ion battery as well as preparation method and application of hard carbon negative electrode material
  • Hard carbon negative electrode material, lithium ion battery as well as preparation method and application of hard carbon negative electrode material
  • Hard carbon negative electrode material, lithium ion battery as well as preparation method and application of hard carbon negative electrode material

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Effect test

Embodiment 1

[0087] In step (1), the petroleum asphalt with a softening point of 250° C. is made into a median particle size D by using a jet mill classifier. 50 It is a carbon source precursor powder of 5 μm; under the condition of stirring, the prepared carbon source precursor powder is dispersed in deionized water, and the mass ratio of the carbon source precursor powder to deionized water is 45:100, And mix according to the mass ratio of the carbon source precursor powder to 30% hydrogen peroxide, 20% nitric acid, boric acid, melamine, and Tween 20 in a ratio of 100:35:50:10:10:2 ; and then carry out the cross-linking reaction at 150° C. for 8 hours to obtain the modified carbon source precursor.

[0088] In step (2), the modified carbon source precursor is heat-treated under nitrogen protection, and the temperature is raised to 550°C at a heating rate of 3°C / min, and kept for 2h, and then lowered to room temperature after the heat treatment; the heat-treated material volatilizes The ...

Embodiment 2

[0091] In step (1), the petroleum asphalt with a softening point of 280° C. is made into a median particle size D by using a jet mill classifier. 50 It is a carbon source precursor powder of 5 μm; under the condition of stirring, the prepared carbon source precursor powder is dispersed in water, the mass ratio of carbon source precursor powder to water is 45:100, and according to the carbon source Mix the precursor powder with ammonium persulfate, 80% phosphoric acid, and cetyltrimethylammonium bromide in a mass ratio of 100:20:38:2; then carry out crosslinking reaction at 180°C for 4h , to prepare a modified carbon source precursor.

[0092] In step (2), the modified carbon source precursor is heat-treated under nitrogen protection, and the temperature is raised to 600°C at a heating rate of 3°C / min, and kept for 1h, and then lowered to room temperature after the heat treatment; the heat-treated material volatilizes The content of the component is 6%. Under the condition of...

Embodiment 3

[0095] In step (1), the coal tar pitch with a softening point of 250° C. is made into a median particle size D by using a jet mill classifier. 50 It is a carbon source precursor powder of 5 μm; under the condition of stirring, the prepared carbon source precursor powder is dispersed in water, the mass ratio of carbon source precursor powder to water is 45:100, and according to the carbon source The precursor powder is mixed with 30% hydrogen peroxide, performic acid, 80% phosphoric acid, urea, and Tween 20 in a mass ratio of 100:35:20:15:10:2; After 4 hours of joint reaction, the modified carbon source precursor was prepared.

[0096]In step (2), the modified carbon source precursor is heat-treated under nitrogen protection, and the temperature is raised to 600°C at a heating rate of 3°C / min, and kept for 1h, and then lowered to room temperature after the heat treatment; the heat-treated material volatilizes The content of the component is 6%. Under the condition of stirring...

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Abstract

The invention discloses a hard carbon negative electrode material, a lithium ion battery and a preparation method and application of the hard carbon negative electrode material. The preparation method comprises the following steps: (1) carrying out cross-linking reaction on carbon source precursor powder and an additive to prepare a modified carbon source precursor, wherein the additive comprises a cross-linking agent, a modifier and a dispersing aid; (2) sequentially carrying out heat treatment and cooling on the modified carbon source precursor, and mixing the modified carbon source precursor with a lithium-rich agent to prepare a modified hard carbon precursor; and (3) carrying out vacuum carbonization on the modified hard carbon precursor to obtain the hard carbon negative electrode material. The hard carbon negative electrode material prepared by the method belongs to typical amorphous carbon and is high in pyrolysis yield, and the lithium ion battery prepared by taking the hard carbon negative electrode material as the negative electrode material is high in first reversible capacity, high in first coulombic efficiency, stable in property and good in batch consistency.

Description

technical field [0001] The invention relates to a hard carbon negative electrode material, a lithium ion battery and a preparation method and application thereof. Background technique [0002] At this stage, carbon materials are widely used as negative electrode materials, among which natural graphite and artificial graphite are the main ones; however, due to the low theoretical capacity of graphite, generally around 372mah / g, and the compatibility of traditional graphite negative electrode materials with electrolyte In the process of charging and discharging, it is easy to cause co-intercalation of solvent ions and destroy the structure, which affects the cycle stability and Coulombic efficiency of graphite anode materials, especially reduces the rate performance of graphite anode materials, which cannot meet the requirements of large-scale power batteries. High current discharge capability. Compared with graphite, hard carbon has isotropic structural characteristics, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/0525H01M4/02
CPCC01B32/05H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 曾繁俊李政杰夏圣安沈龙张秀云
Owner SHANGHAI SHANSHAN TECH CO LTD
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