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A kind of preparation method of negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult large-scale industrialization, harsh preparation conditions, and low efficiency, and achieve volume change, easy porous structure, The effect of simple process

Active Publication Date: 2021-02-19
福建宝雄工业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the CVD method has the disadvantages of harsh preparation conditions, low efficiency, and high cost, and is difficult to apply to large-scale industrialization; the Si / C composite material constructed by pyrolyzing organic matter into carbon is easy to form a dense structure, and it is difficult to form pores in the material to buffer Huge volume change during Si charging and discharging, so the cycle stability of Si material cannot be effectively improved

Method used

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  • A kind of preparation method of negative electrode material of lithium ion battery
  • A kind of preparation method of negative electrode material of lithium ion battery
  • A kind of preparation method of negative electrode material of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Measure 20ml of distilled water, add 630mg of trimesic acid into it, keep stirring, and add dropwise 10ml of 1mol / L KOH solution to dissolve the trimesic acid to form solution A. Weigh 100 mg of silicon powder with a particle size of 20 nm, add it into a beaker filled with 15 ml of distilled water and 2 ml of ethanol, and ultrasonically disperse for 1 hour to obtain dispersion B. Dispersion B was mixed with solution A to form mixed dispersion C. Then, under the condition of constant stirring, 2 ml of acetic acid was added dropwise to the dispersion C, and the stirring was continued for 30 min. Then it was filtered with suction to obtain a solid mixture.

[0036] The solid mixture was placed in a tube furnace, heated to 700°C for 5 hours at a rate of 2°C / min under a nitrogen atmosphere, and then cooled to room temperature to obtain a black solid substance, which was washed with distilled water to remove potassium from the material. Then, vacuum drying was performed at ...

Embodiment 2

[0039] Measure 20ml of distilled water, add 630mg of trimesic acid into it, keep stirring, and add dropwise 10ml of 1mol / L NaOH solution to dissolve the trimesic acid to form solution A. Weigh 150 mg of silicon powder with a particle size of 50 nm, add it into a beaker filled with 15 ml of distilled water and 2 ml of ethanol, and ultrasonically disperse for 1 hour to obtain dispersion B. Dispersion B was mixed with solution A to form mixed dispersion C. Then, under the condition of constant stirring, 2 ml of propionic acid was added dropwise to the dispersion C, and the stirring was continued for 30 min. Then it was filtered with suction to obtain a solid mixture.

[0040] The solid mixture was placed in a tube furnace, heated at a rate of 2°C / min to 750°C for 3 hours under a nitrogen atmosphere, and then cooled to room temperature to obtain a black solid substance, which was washed with distilled water to remove potassium from the material. Then, vacuum drying was performed...

Embodiment 3

[0042] Measure 20ml of distilled water, add 630mg of trimesic acid into it, keep stirring, and dropwise add 10ml of 1mol / L ammonia water to dissolve the trimesic acid to form solution A. Weigh 150 mg of silicon powder with a particle size of 20 nm, add it into a beaker filled with 15 ml of distilled water and 2 ml of ethanol, and ultrasonically disperse for 1 hour to obtain dispersion B. Dispersion B was mixed with solution A to form mixed dispersion C. Then, under the condition of constant stirring, 2ml of formic acid was added dropwise to the dispersion C, and the stirring was continued for 30min. Then it was filtered with suction to obtain a solid mixture.

[0043] The solid mixture was placed in a tube furnace, heated at a rate of 5°C / min to 650°C for 5 hours under an argon atmosphere, and then cooled to room temperature to obtain a black solid substance, which was washed with distilled water to remove potassium from the material. Then, vacuum drying was performed at 100...

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Abstract

The application provides a method for preparing a lithium ion battery negative electrode material, which belongs to the technical field of lithium ion battery materials and preparation methods thereof. Dissolve trimesic acid in the Si powder dispersion under alkaline conditions, then add an organic acid to make the trimesic acid cross-linked into a fiber network structure through hydrogen bonds, wrap the Si powder and precipitate from the solution in solid form, continued Heat treatment at high temperature to obtain Si / C composite material. In this application, by changing the molar ratio of organic acid and trimesic acid to Si powder and other factors, the ratio of Si to carbon and the properties of pores in Si / C composites can be adjusted to adapt to the huge volume change in the charging and discharging process of Si. , so as to solve the volume effect problem of Si electrode material.

Description

technical field [0001] The application relates to a preparation method of a negative electrode material of a lithium ion battery, and belongs to the technical field of lithium ion battery materials and preparation methods thereof. Background technique [0002] In lithium-ion battery anode materials, Si has a theoretical capacity of 4200mAh / g, which is very promising to replace graphite carbon for lithium-ion batteries, thereby improving the energy density of batteries. However, the volume of Si changes greatly during the charging and discharging process, and the change rate is as high as 300%, which easily causes Si particle deformation, cracking, and even pulverization, which leads to a serious problem of deterioration of Si charging and discharging cycle performance. At present, the ideal way to solve this problem is to combine Si and carbon to form a Si / C composite material, in which carbon is used to stabilize the structure of Si and improve the electronic conductivity o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 严顺榕周乐张祎黄俊杰
Owner 福建宝雄工业科技有限公司
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