Preparation method and application of silicon-carbon composite material

A silicon-carbon composite material and silicon-based technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of unsatisfactory packaging and high energy consumption, and achieve improved electrochemical performance, less usage, and a reasonable proportion Effect

Inactive Publication Date: 2017-03-29
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the solvent is evaporated to dryness, which consumes a lot of energy, and the coating of organic polymers such as glucose is not ideal

Method used

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  • Preparation method and application of silicon-carbon composite material
  • Preparation method and application of silicon-carbon composite material
  • Preparation method and application of silicon-carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation of silicon-carbon composite materials

[0038] Using a planetary ball mill, 1 g of ferrosilicon alloy with a silicon content of 65% was pulverized into small particles, wherein the mass ratio of the ball to material was about 4:1, the rotation speed was 500 rpm, and the ferrosilicon alloy powder was obtained after 6 hours of ball milling time.

[0039] Place the ferrosilicon alloy material obtained in a beaker, add an excess of sulfuric acid with a molar concentration of 1 mol / L, and stir with a magnetic stirrer at room temperature for 24 hours to remove iron metal elements, and the reaction product is washed 3 times with deionized water; then The product was added to excess hydrofluoric acid solution with a mass fraction of 5% to remove silicon oxide, magnetically stirred at room temperature for 12 hours, and the reaction product was washed three times with deionized water and hydrofluoric acid respectively to obtain a porous silicon material.

[0040]Ad...

Embodiment 2

[0047] 1. Preparation of silicon-carbon composite materials

[0048] Using a planetary ball mill, 5 g of ferrosilicon alloy with a silicon content of 75% was pulverized into small particles, wherein the mass ratio of the ball to material was about 4:1, the rotating speed was 550 rpm, and the ferrosilicon alloy powder was obtained after ball milling for 8 hours.

[0049] Place the ferrosilicon alloy material obtained in a beaker, add an excess of sulfuric acid with a molar concentration of 1 mol / L, and stir with a magnetic stirrer at room temperature for 24 hours to remove iron metal elements, and the reaction product is washed 3 times with deionized water; then The product was added to excess hydrofluoric acid solution with a mass fraction of 5% to remove silicon oxide, magnetically stirred at room temperature for 12 hours, and the reaction product was washed three times with deionized water and hydrofluoric acid respectively to obtain a porous silicon material.

[0050] Add 7...

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Abstract

The invention discloses a preparation method and application of a silicon-carbon composite material, belonging to the technical field of preparation of composite materials. The preparation method comprises the following steps of: (1), grinding silicon-based alloy into powder, and performing acid pickling to obtain a porous silicon material; and (2), mixing the porous silicon material with an organic polymer carbon source and a solvent, performing ball-milling to obtain a homogenate type mixture, and performing thermal treatment after drying so as to obtain the silicon-carbon composite material. According to the preparation method and application disclosed by the invention, when carbon coating is carried out, the organic polymer carbon source (such as polyvinylidene fluoride) having high viscosity is mixed with a little solvent, so that thick colloid is prepared; then, matched with ball-milling, the organic polymer carbon source is adhered to the surface of porous silicon effectively and uniformly; the carbon coating efficiency is relatively high; in addition, the use amount of the organic solvent is low; energy consumed by solvent evaporation is saved; therefore, the production cost is reduced; the preparation process is simple, and suitable for large-scale production; the silicon-carbon proportion in the prepared silicon-carbon composite material is reasonable; the volume strain capacity is better; and the electrochemical performance of a lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a preparation method and application of a silicon-carbon composite material. Background technique [0002] Lithium-ion batteries have become ideal power sources for portable electronic devices such as notebook computers and mobile electronic devices due to their outstanding advantages such as high specific energy, large capacity, high voltage, low self-discharge, good cycle performance, and long service life. In order to meet the increasing demand, developing new lithium-ion batteries with high energy density, high power density and long cycle life is an extremely important research direction in the field of lithium-ion battery research. [0003] Silicon is a new type of negative electrode material for lithium-ion batteries. Its lithium storage reaction voltage platform is low, and its theoretical capacity is extremely high (4200mAh / g), which is much higher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/628H01M10/0525Y02E60/10
Inventor 周敏李文施利勇
Owner TIANNENG SAFT ENERGY JOINT CO
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