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Carbon silicon composite material, its preparation method and use

A composite material and silicon material technology, applied in the field of carbon-silicon composite materials, can solve problems such as not meeting the needs, and achieve the effects of good dynamic performance, large porosity, and avoidance of agglomeration

Inactive Publication Date: 2007-01-31
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the existing technology can not meet the needs when using silicon material or carbon material alone as the negative electrode material of lithium ion battery, thereby providing a kind of material with large specific surface area and large porosity, which can fully utilize silicon Function of carbon and carbon, carbon-silicon composite material growing carbon nanotubes or nano-carbon fibers on the surface of silicon particles, and its preparation method and use

Method used

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  • Carbon silicon composite material, its preparation method and use
  • Carbon silicon composite material, its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: take by weighing 0.001g Fe powder and 10g silicon particle (its average particle diameter is 5 μ m), grind 5 hours, then the material of gained is placed in a graphite boat, then packs into tube furnace, fills with argon Gas, the flow rate is 20 sccm, after the temperature is programmed to 800 ° C, the gas is converted into a mixture of methane and hydrogen, the ratio is 1:20 (v / v), the total flow rate is 300 sccm, and the chemical vapor deposition is carried out at a constant temperature for 20 minutes. The gas is converted into argon, and naturally cooled to room temperature, and the obtained product is a silicon / multi-walled carbon nanotube composite material, wherein the average diameter of the multi-walled carbon nanotube is 8 nm, and the length is 60 μm. Its morphology in field emission scanning electron microscopy is as follows figure 1 As shown, the morphology in high magnification field emission scanning electron microscopy is as follows figure ...

Embodiment 2

[0048] Embodiment 2: take by weighing 0.001g Fe powder and 10g silicon particle (its average particle diameter is 10 μ m), grind 5 hours, then the material of gained is placed in the aluminum oxide boat, then packs in the tube furnace, fills Enter argon gas, the chemical vapor deposition process is the same as in Example 1, and the chemical vapor deposition time is 2 hours. Silicon / multi-walled carbon nanotube composite material, wherein the average diameter of the multi-walled carbon nanotubes is 15 nm, and the length is 160 μm.

[0049] The positive and negative electrodes were prepared as described in Example 1, and the battery was assembled for testing. The experimental battery was subjected to a charge-discharge cycle test by an automatic charge-discharge instrument controlled by a computer. The charge cut-off voltage is 4.2V, and the discharge cut-off voltage is 2.0V. Studies have proved that the silicon / multi-walled carbon nanotube composite material is used as a negati...

Embodiment 3

[0050] Embodiment 3: take by weighing 0.001g Fe powder and 10g silicon particle (its average particle diameter is 100nm), grind 5 hours, then the material of gained is placed in the aluminum oxide boat, then packs in the tube furnace, fully Enter a mixture of argon and hydrogen, the ratio of which is 85:15 (v / v). After the temperature is programmed to 700 ° C, the gas is converted to ethylene, and the flow rate is 50 sccm. After chemical vapor deposition at a constant temperature for 2 hours, the gas is converted to Nitrogen, naturally cooled to room temperature, the resulting product is silicon / multi-walled carbon nanotube composite material, wherein the average diameter of the multi-walled carbon nanotubes is 17 nm, and the length is 70 μm.

[0051] The positive and negative electrodes were prepared as described in Example 1, and the battery was assembled for testing. The experimental battery was subjected to a charge-discharge cycle test by an automatic charge-discharge inst...

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Abstract

The present invention relates to a carbon-silicon composite material. It includes silicon matrix and carbon nano tube or nano carbon fibre grown on the matrix. The average grain size of the described silicon matrix is 100 nm-100 micrometer, the diameter of the described carbon nano tube or nano carbon fibre is 1-200 nm and its length is 1 nm-100 micrometer. The described carbon nano tube is single-wall, double-wall or multiwall. Said invention also provides its preparation method and concrete steps.

Description

technical field [0001] The invention relates to a carbon-silicon composite material, its preparation method and application. Background technique [0002] These two elements, silicon and carbon, are very abundant in the universe, ranking third and seventh respectively, so the commercialization of these two materials has very promising prospects, but in practical applications, such as lithium As an anode material for ion batteries, although silicon has a very high mass specific capacity, the conductivity of silicon is very low, and a huge volume change will occur during cycling, making the cycle performance of the material very poor, which limits the use of silicon in lithium-ion batteries. Application in battery negative electrode materials; in contrast, carbon materials have very good reversibility of lithium ion intercalation and extraction, but its capacity is relatively low, which cannot meet the needs of the growing society for high specific energy batteries Although c...

Claims

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Application Information

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IPC IPC(8): C04B35/628C04B35/515H01M4/04H01M4/58H01M8/00H01M4/38H01M4/90
CPCY02E60/50Y02E60/10
Inventor 舒杰李泓黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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