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Preparation method of graphene-loaded carbon-coated tin antimony lithium battery negative electrode material

A technology of carbon-coated tin-antimony and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large irreversible capacity loss and low specific capacity, and achieve the effect of reducing polarization resistance and improving rate performance

Pending Publication Date: 2022-07-05
内蒙古欣源石墨烯科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to provide a kind of preparation method of lithium battery anode material of graphene-loaded carbon coating tin-antimony, the obtained material has high charge and discharge efficiency for the first time and high specific capacity, which solves the problem of carbon in the prior art. The problems of large irreversible capacity loss and low specific capacity exist in the application of preparing lithium battery negative electrodes

Method used

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  • Preparation method of graphene-loaded carbon-coated tin antimony lithium battery negative electrode material
  • Preparation method of graphene-loaded carbon-coated tin antimony lithium battery negative electrode material

Examples

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Embodiment 1

[0028] A preparation method of a graphene-loaded carbon-coated tin-antimony lithium battery negative electrode material, comprising the following steps:

[0029] (1) Graphene and fullerene in mass ratio of 1:1 are put into a solvent, and ultrasonically treated for 20-60min at a frequency of 20-150KHz to form a uniform mixed solution;

[0030] (2) Use tin source and antimony source as auxiliary materials, in a ball mill, use copper balls as grinding bodies, fill nitrogen as protective gas, and grind the auxiliary materials to a particle size of 20-40 μm for 10-15 hours;

[0031] (3) dissolving the tin source and antimony source auxiliary materials obtained in step (2) in N-methylpyrrolidone to obtain the N-methylpyrrolidone solution of the tin source and antimony source, and dissolving the prepared tin source and antimony source N-methylpyrrolidone solution -The methylpyrrolidone solution is poured into the mixed solution, stirred for 30-60min to obtain a mixed slurry;

[0032...

Embodiment 2

[0041] The content of this example is basically the same as that of Example 1, and the similarities will not be repeated. The difference is that: in the step (1), graphene and fullerenes in a mass ratio of 1.5:1 are put into the solvent, and the frequency Ultrasonic treatment at 20-150KHz for 20-60min to form a homogeneous mixed solution.

Embodiment 3

[0043] The content of this example is basically the same as that of Example 1, and the similarities will not be repeated. The difference is that in the step (1), graphene and fullerenes in a mass ratio of 2:1 are put into the solvent, and the frequency Ultrasonic treatment at 20-150KHz for 20-60min to form a homogeneous mixed solution.

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Abstract

The invention discloses a preparation method of a graphene-loaded carbon-coated tin antimony lithium battery negative electrode material. The preparation method comprises the following steps: (1) putting graphene and fullerene into a solvent to form a mixed solution; (2) adopting a tin source and an antimony source as auxiliary materials; (3) dissolving auxiliary materials of a tin source and an antimony source into N-methyl pyrrolidone, and pouring into the mixed solution to obtain mixed slurry; (4) putting the mixed slurry into a freeze dryer to form mixed powder; (5) the mixed powder is put into an atomizer, then argon is loaded, and a precursor is formed; and (6) putting the precursor in the step (5) into a press machine and a dryer to obtain the lithium battery negative electrode material. The material obtained by the invention is high in first charge-discharge efficiency and high in specific capacity, and solves the problems of large irreversible capacity loss and relatively low specific capacity when carbon is applied to actual preparation of a lithium battery negative electrode in the prior art.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and in particular relates to a preparation method of a graphene-loaded carbon-coated tin-antimony lithium battery negative electrode material. Background technique [0002] In a galvanic cell, the negative electrode refers to the electrode that plays an oxidizing role. For the negative electrode material, it refers to the material that constitutes the negative electrode in the battery. At present, common negative electrode materials include tin-based negative electrode materials, alloy negative electrode materials, carbon negative electrode materials and nano-scale negative electrode materials. [0003] Lithium-ion batteries usually use graphite as the negative electrode material, but the specific capacity of the graphite negative electrode is low, which is difficult to meet the requirements of high-energy density lithium-ion battery design. The anode materials of lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/366H01M4/387H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 薛永谢志懋
Owner 内蒙古欣源石墨烯科技股份有限公司