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Preparation method for silicon-carbon composite material

A technology of silicon-carbon composite materials and silicon powder, which is applied in the direction of final product manufacturing, sustainable manufacturing/processing, and electrolyte battery manufacturing, etc., can solve the problems of active material shedding, battery cycle stability decline, and structural collapse, etc., to improve electrical conductivity High performance, excellent cycle performance, and low cost

Inactive Publication Date: 2015-10-21
XIAN BONA MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the condition of high degree of lithium desorption / intercalation, silicon materials have serious volume effect, which can easily cause structure collapse, active material falling off, and the cycle stability of the battery is greatly reduced.

Method used

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  • Preparation method for silicon-carbon composite material
  • Preparation method for silicon-carbon composite material
  • Preparation method for silicon-carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a closed reactor, add 1g glucose, 0.1g polyvinylpyrrolidone (K30), 0.3g silicon powder and 3mL glacial acetic acid, and react at 200°C for 8 hours. After the reaction, a cylindrical gel is obtained. See figure 1 , the gel was freeze-dried and calcined at 1000° C. for 1 hour under a nitrogen atmosphere to obtain a silicon-carbon composite material. Its scanning electron microscope picture is shown in figure 2 , as can be seen from the figure, the composite material is spherical, with a size of about 100 nm; its EDX energy spectrum is shown in image 3 , It can be seen from the figure that the composite material contains three elements: carbon, oxygen and silicon.

Embodiment 2

[0020] In a closed reaction kettle, add 1g fructose, 0.1g polyacrylic acid, 0.1g silicon powder and 0.5mL formic acid, and react at 160°C for 8 hours. Calcined at 500° C. for 4 hours under a nitrogen atmosphere to obtain a silicon-carbon composite material.

Embodiment 3

[0022] In a closed reaction kettle, add 1g maltose, 0.1g polyacrylamide, 0.2g silicon powder and 3mL ethylene glycol, and react at 200°C for 8 hours. Calcined at 300° C. for 4 hours under a nitrogen atmosphere to obtain a silicon-carbon composite material.

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Abstract

The invention relates to a preparation method for a silicon-carbon composite material, and belongs to the technical field of carbon composite material preparation. The preparation method comprises the specific steps that carbohydrate, high polymer, silicon powder and organic solvent are subjected to reaction in a sealed vessel at the temperature ranging from 150 DEG C-250 DEG C, and the silicon-carbon composite material is obtained through drying and calcination. The preparation method for the silicon-carbon composite material has the advantages that the needed material is easy to acquire, the cost is low, and the preparation process is easy. The prepared silicon-carbon composite material has the advantages of being small and controllable in size, high in the specific capacity and excellent in the cycle performance.

Description

technical field [0001] The invention relates to a method for preparing a silicon-carbon composite material, which belongs to the technical field of carbon composite material preparation. Background technique [0002] Graphite anode materials have high cycle efficiency and good cycle performance, and have been widely used in the preparation of lithium-ion battery anode materials. However, its theoretical specific capacity is only 372 mAh / g, so it is necessary to develop new anode materials to improve the electrochemical performance of lithium-ion batteries. At present, silicon materials have become candidates for lithium-ion battery anode materials due to their advantages such as high capacity, abundant resources, and similar potential to carbon materials. However, the silicon material has a serious volume effect under the high degree of lithium desorption / intercalation, which is easy to cause the structure to collapse, the active material to fall off, and the cycle stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/139H01M10/058H01M10/0525
CPCH01M4/139H01M4/362H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 党桃桃
Owner XIAN BONA MATERIAL TECH CO LTD
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