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Manufacture method of carbon-silicon compound cathode material of lithium ion battery

A lithium-ion battery, carbon-silicon composite technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of environmental pollution of organic solvents, high cost of preparation methods, and increased specific capacity of materials, etc. The effect of high specific capacity

Active Publication Date: 2012-09-19
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above material is a single carbon negative electrode material. Due to the capacity bottleneck of the carbon material, the further improvement of the specific capacity of the material is limited, and the preparation method of solvent replacement is costly, and the organic solvent seriously pollutes the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method for preparing a carbon-silicon composite negative electrode material for a lithium-ion battery, comprising the following process steps:

[0037] A. Add one or a variety of amphiphilic carbon materials in any proportion to deionized water, and adjust the pH value of the solution to 10 with a water-soluble alkali to make an amphiphilic carbon material solution;

[0038]B, according to the mass ratio of crystalline silicon and amphiphilic carbon material solution is 1:100, take the crystalline silicon powder that particle diameter is 3nm, join in the amphiphilic carbon material solution and stir, obtain carbon-silicon mixed liquid;

[0039] C. Put the above-mentioned amphiphilic carbon material solution into a freeze dryer, freeze it at -50°C, and sublimate the ice into water vapor under a vacuum of 1.3Pa and remove it to obtain a gray-black powder, which is Amphiphilic carbon material / silicon composite.

[0040] D. Carbonize the amphiphilic carbon ma...

Embodiment 2

[0042] A preparation method for preparing a carbon-silicon composite negative electrode material for a lithium-ion battery, comprising the following process steps:

[0043] A. Add one or a variety of amphiphilic carbon materials in any proportion to deionized water, and adjust the pH value of the solution to 14 with a water-soluble alkali to make an amphiphilic carbon material solution;

[0044] B, according to the mass ratio of crystalline silicon and amphiphilic carbon material solution is 1:1000, take the crystalline silicon powder that particle diameter is 10nm, join in the amphiphilic carbon material solution and stir, obtain carbon-silicon mixed liquid;

[0045] C. Put the above-mentioned amphiphilic carbon material solution into a freeze dryer, freeze it at -10°C, and sublimate the ice in it into water vapor under a vacuum of 60Pa and remove it to obtain a gray-black powder, which is two Affinity Carbon Materials / Silicon Composite Materials.

[0046] D. Carbonize the a...

Embodiment 3

[0048] A preparation method for preparing a carbon-silicon composite negative electrode material for a lithium-ion battery, comprising the following process steps:

[0049] A. Add one or a variety of amphiphilic carbon materials in any proportion to deionized water, and adjust the pH value of the solution to 12 with a water-soluble alkali to make an amphiphilic carbon material solution;

[0050] B, according to the mass ratio of crystalline silicon and amphiphilic carbon material solution is 1:550, take the crystalline silicon powder that particle diameter is 6.5nm, join in the amphiphilic carbon material solution and stir, obtain carbon-silicon mixed liquid;

[0051] C. Put the above-mentioned amphiphilic carbon material solution into a freeze dryer, freeze it at -30°C, and sublimate the ice into water vapor under a vacuum of 30.65Pa and remove it to obtain a gray-black powder, which is Amphiphilic carbon material / silicon composite.

[0052] D. Carbonize the amphiphilic carb...

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Abstract

The invention discloses a manufacture method of a carbon-silicon compound cathode material of a lithium ion battery, belonging to the technical field of cathode materials of a lithium ion battery. The invention is a simple in a synthetic technology and a use device; and compared with the synthetic method of traditional carbon-silicon compound cathode materials such as a chemical vapor deposition method, the manufacture method is lower in the production cost; and by adopting the process method and the technological parameter, amphiphilic carbon material nanoparticles are manufactured through freezing and drying, so that the step of an organic solvent replacement process is saved, and the cost and the environmental pollution and the toxicity to the personal, caused by the organic solvent are reduced.

Description

technical field [0001] The invention relates to a method for preparing a composite negative electrode material for a lithium-ion battery, more specifically, the invention relates to a method for preparing a carbon-silicon composite negative electrode material for a lithium-ion battery, which belongs to the lithium-ion battery negative electrode field of materials technology. Background technique [0002] Lithium-ion secondary batteries have high energy density, high working voltage, long cycle life, no pollution, and good safety performance, making them widely used in portable electronic devices, electric vehicles, large-scale energy storage, space technology, and national defense industries. The application prospect has become a research hotspot during the "Twelfth Five-Year Plan" period. [0003] One of the key technologies of lithium-ion batteries lies in the research on negative electrode materials, so as to improve the performance of batteries. Graphite material has t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 王瑨郑威胡蕴成王荣贵
Owner DONGFANG ELECTRIC CORP LTD
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