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Preparation method of carbon nanotube composite porous silicon anode material for lithium ion battery

A carbon nanotube composite and lithium-ion battery technology, which is applied to battery electrodes, secondary batteries, circuits, etc., to achieve the effects of simple equipment, alleviating volume stress, and increasing electrical contact points

Inactive Publication Date: 2016-10-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is precisely because the silicon material has a huge amount of lithium ion intercalation and deintercalation that it produces a huge volume effect during the charge and discharge process—the volume expansion under the theoretical capacity is about 400%.

Method used

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  • Preparation method of carbon nanotube composite porous silicon anode material for lithium ion battery
  • Preparation method of carbon nanotube composite porous silicon anode material for lithium ion battery
  • Preparation method of carbon nanotube composite porous silicon anode material for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Weigh 10 g of silica with a particle size of 200 nm and 15 g of magnesium powder of 250-300 mesh, put them in an agate mortar and grind them evenly, then put the mixed powder in a corundum crucible, and place in a tube furnace Inside, nitrogen was used as a protective gas, and sintered at a high temperature of 700 ° C for 6 h to obtain powders of porous silicon and its by-products;

[0032] (2) Use hydrochloric acid to remove unreacted magnesium powder and by-product magnesium oxide from the powder obtained in (1), and dry to obtain pSS;

[0033] (3) Mix the pSS obtained in (2) and ferrous sulfate in water and evaporate the water to dryness. Then put the mixture powder in a tube furnace, pass hydrogen as the reducing gas, and sinter at 700 °C for 6 h at a high temperature to obtain porous silicon loaded with iron catalyst;

[0034] (4) Put the porous silicon loaded with iron catalyst obtained in (3) in a tube furnace, pass a mixed gas of methane and nitrogen for 1-...

Embodiment 2

[0037] (1) Weigh 5 g of silica with a particle size of 7 nm and 4.5 g of magnesium powder of 100-200 mesh, place them in an agate mortar and grind them evenly, then place the mixed powder in a corundum crucible, and place in a tube furnace Inside, the mixed gas of hydrogen and argon is used as the protective gas, and the powder of porous silicon and its by-products is obtained by sintering at a high temperature of 550 °C for 10 h;

[0038] (2) Use hydrochloric acid to remove unreacted magnesium powder and by-product magnesium oxide from the powder obtained in (1), then use hydrofluoric acid to remove unreacted silicon dioxide, and dry to obtain pSS;

[0039] (3) Mix the pSS obtained in (2) and ferric nitrate in a mixed solution of water and ethanol and evaporate to dryness. Then put the mixture powder in a tube furnace, pass hydrogen and argon mixed gas as reducing gas, and sinter at 500 °C for 8 h at a high temperature to obtain porous silicon loaded with iron catalyst;

[0...

Embodiment 3

[0043] (1) Weigh 1 g of silica with a particle size of 100 nm and 1.2 g of magnesium powder of 100-200 mesh, put them in an agate mortar and grind them evenly, then put the mixed powder in a corundum crucible, and place in a tube furnace Inside, argon was used as a protective gas, and sintered at 950 °C for 2 h at a high temperature to obtain powders of porous silicon and its by-products;

[0044] (2) Use nitric acid to remove unreacted magnesium powder and by-product magnesium oxide from the powder obtained in (1), then use hydrofluoric acid to remove unreacted silicon dioxide, and dry to obtain pSS;

[0045] (3) Mix the pSS obtained in (2) with ferric chloride in a mixed solution of water and isopropanol and evaporate to dryness. Then put the mixture powder in a tube furnace, pass carbon monoxide as a reducing gas, and sinter at 900 °C for 2 h at a high temperature to obtain porous silicon loaded with iron catalyst;

[0046](4) Put the porous silicon loaded with iron cataly...

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Abstract

The invention belongs to the technical field of preparation of lithium ion batteries, and particularly relates to a preparation method of a carbon nanotube composite porous silicon anode material for a lithium ion battery. The preparation method mainly comprises the following steps: preparing porous silicon by thermal reduction; coating the porous silicon with carbon by chemical vapor deposition and compounding carbon nanotubes; removing an iron catalyst by acid treatment. The preparation technology is low in energy consumption and cost, reversible capacity of the silicon anode material is increased effectively, the rate capability is improved, and the cycle life is prolonged. Primary particle sizes of the prepared porous silicon are 50-500 nm, a uniform carbon layer with the thickness range of 2-50 nm is deposited on the surface of the porous silicon, and the carbon nanotubes are distributed inside and outside particles, so that overall electronic conductivity of the porous silicon is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium ion battery negative electrode material—carbon nanotube composite porous silicon. Background technique [0002] Most of the anode materials for commercial lithium-ion batteries today are artificial graphite or natural graphite, with a theoretical specific capacity of 372 mAh g -1 , the potential for lithium is about 0.5 V, and the specific capacity of silicon as the negative electrode material of lithium-ion batteries is 4200mAh g -1 , the potential for lithium is about 0.2 V, compared with the former, the advantage is obvious. Because of the ultra-high specific capacity and low potential of silicon materials, it becomes the theoretically best anode material for lithium-ion batteries. However, it is precisely because of the huge amount of silicon material that can be used for lithium ion intercalation and deintercalati...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/38H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 余爱水苏俊铭陈春光陈翔刘思杨黄桃
Owner FUDAN UNIV
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