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Preparation method of spherical porous silicon-carbon composite particles

A composite particle and carbon composite technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problem that the performance of silicon carbon composite materials needs to be further improved.

Inactive Publication Date: 2017-08-11
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the performance of silicon-carbon composites obtained by the above preparation method needs to be further improved

Method used

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  • Preparation method of spherical porous silicon-carbon composite particles
  • Preparation method of spherical porous silicon-carbon composite particles
  • Preparation method of spherical porous silicon-carbon composite particles

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preparation example Construction

[0021] Please refer to figure 1 , a method for preparing spherical porous silicon-carbon composite particles, comprising the steps of:

[0022] S1, providing a Na 2 SiO 3 solution;

[0023] S2, dissolving a carbohydrate compound in the Na 2 SiO 3 solution, forming a first solution;

[0024] S3, spray drying the first solution to form spherical Na 2 SiO 3 / carbohydrate composite particles;

[0025] S4, the spherical Na 2 SiO 3 / Sugar composite particles are added to concentrated sulfuric acid for carbonization treatment to form a suspension, which includes spherical porous Na 2 SiO 3 / C composite particles;

[0026] S5, adding the suspension into distilled water for dilution to make spherical porous Na 2 SiO 3 / Na in carbon composite particles 2 SiO 3 Hydrolysis, forming spherical porous SiO 2 / C composite particles;

[0027] S6, obtained spherical porous SiO by filtration 2 / C composite particles;

[0028] S7, combining a reducing agent with the spherical...

Embodiment 1

[0043] The preparation concentration is 20% Na 2 SiO 3 Solution, according to the carbonization rate of 20%, sucrose with a silicon content of 10%, is dissolved and spray-dried, wherein the spray parameters are: the feed rate is 4ml / min., the inlet temperature is 160°C, and the pressure is 0.4MPa; the obtained product Immediately add an appropriate amount of concentrated H 2 SO 4 The sucrose is carbonized, and after a certain period of time, the mixed solution is slowly added to distilled water to dilute to obtain SiO 2 / C composite material, after filtration, cleaning and drying, the powder is mixed evenly with the theoretical amount of 110% magnesium powder in an inert dry atmosphere, and after compaction, react at 600°C in an inert atmosphere and naturally cool down to room temperature, then dissolve the powder in distilled water Make the residual magnesium powder react and dissolve the generated MgO, filter, wash and dry to obtain spherical porous Si / C composite particl...

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Abstract

The invention discloses a preparation method of spherical porous silicon carbon composite particles. The preparation method comprises the following steps: providing a Na2SiO3 solution; dissolving a carbohydrate in the Na2SiO3 solution to form a first solution; carrying out spray drying on the first solution to form spherical Na2SiO3 / saccharides composite particles; adding the spherical Na2SiO3 / saccharides composite particles in concentrated sulfuric acid for carbonizing treatment to form a turbid liquid, further adding the turbid liquid in distilled water and hydrolyzing Na2SiO3 to obtain a turbid liquid of porous SiO2 / C composite particles; filtering to obtain spherical porous SiO2 / C composite particles; mixing a reducing agent with the spherical porous SiO2 / C composite particles, and heating to reduce SiO2 in the spherical porous SiO2 / C composite particles to form the spherical porous SiO2 / C composite particles.

Description

technical field [0001] The invention relates to a method for preparing spherical porous silicon-carbon composite particles. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries after lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries. Today, when the world is facing continuous shortage of oil resources and deteriorating environment, lithium-ion batteries have become a high-tech development due to their advantages such as high capacity, long cycle life, small self-discharge, no memory effect, no environmental pollution and good safety performance. One of the key points, it is considered to be an ideal choice for high-capacity, high-power batteries, and is an environmentally friendly power source in the 21st century. Since the commercialization of rechargeable lithium-ion batteries in 1990, its application range has been continuously expanded, ranging from portable electronic devices such as mobile phone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525
CPCH01M4/364H01M4/386H01M4/587H01M10/0525Y02E60/10
Inventor 路密杨行陈海肖彩霞汤林斌
Owner XIAMEN UNIV OF TECH