Silicon carbon composite material and preparation method thereof

A technology of silicon-carbon composite materials and carbon nanomaterials, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of low production efficiency, cumbersome preparation process, and cycle stability to be further improved, so as to reduce the preparation cost and buffer Volume effect, the effect of maintaining cycle stability

Active Publication Date: 2011-09-14
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first reversible capacity of the composite is 1115mAh / g, and the capacity retention rate after 20 cycles is 77%, and the cycle stability still needs to be further improved.
In addition, the preparation process of the composite material is cumbersome and the production efficiency is low

Method used

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  • Silicon carbon composite material and preparation method thereof
  • Silicon carbon composite material and preparation method thereof
  • Silicon carbon composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of mesoporous silica: 2.0g ethylene oxide / propylene oxide block copolymer (Pluronic P123) was dissolved in a mixed solution of 15.0g water, 2.0g 1-butanol and 60.0g hydrochloric acid (2mol / L) After stirring evenly, add 4.2g tetraethyl orthosilicate (TEOS), then stir at 35°C for 24 hours, then transfer to a hydrothermal reaction kettle, keep the temperature at 100°C for 24 hours, and after cooling, centrifuge at 6000r / min, 100 °C, and then calcined at 550 °C for 2 hours in an air atmosphere to obtain mesoporous silica.

[0043] (1) Preparation of porous silicon matrix:

[0044] Put 0.35g of mesoporous silica and 0.35g of magnesium powder in a high-temperature furnace, raise the temperature to 650°C in argon, keep it warm for 7 hours, cool naturally, then place in 30ml of hydrochloric acid (2mol / L) and stir for 12 hours. After centrifugation at 6000r / min for 4 times, vacuum drying at 80°C for 12 hours to obtain a porous silicon matrix;

[0045] (2) Loaded ca...

Embodiment 2

[0052] Preparation of mesoporous silica: Dissolve 2.0g Pluronic P123 in a mixed solution of 15.0g water and 60.0g hydrochloric acid (2mol / L), stir evenly, add 4.2g TEOS, stir at 35°C for 24 hours, then transfer Put it into a hydrothermal reaction kettle, keep the temperature at 100°C for 24 hours, centrifuge at 5000r / min after cooling, dry at 90°C, and then calcinate at 650°C for 2 hours in an air atmosphere to obtain mesoporous silica.

[0053] (1) Preparation of porous silicon matrix:

[0054] Put 0.4g of mesoporous silica and 0.4g of magnesium powder in a high-temperature furnace, raise the temperature to 700°C in argon, keep it warm for 6 hours, cool it down naturally, then place it in 40ml of hydrochloric acid (2mol / L) and stir for 12 hours. After centrifugation at 5000r / min for 4 times, vacuum drying at 80°C for 12 hours to obtain a porous silicon matrix;

[0055] (2) Loaded catalyst precursor:

[0056] Disperse 0.35g of porous silicon matrix and 0.04g of ferric chlori...

Embodiment 3

[0062] Preparation of mesoporous silica: Dissolve 3.0g Pluronic P123 in a mixed solution of 22.5g water, 3.0g 1-butanol and 135.0g hydrochloric acid (2mol / L), stir well, add 9.5g TEOS, and then Stir for 24 hours, then transfer to a hydrothermal reaction kettle, keep the temperature at 100°C for 24 hours, centrifuge at 5000r / min after cooling, dry at 80°C, and then calcinate at 650°C for 2 hours in an air atmosphere to obtain mesoporous silica .

[0063] (1) Preparation of porous silicon matrix:

[0064] Put 0.25g of mesoporous silica and 0.25g of magnesium powder in a high-temperature furnace, raise the temperature to 750°C in argon, keep it warm for 6 hours, cool naturally, and then place it in 30ml of hydrochloric acid (2mol / L) and stir for 12 hours. After centrifugation at 5000r / min for 4 times, vacuum drying at 80°C for 12 hours to obtain a porous silicon matrix;

[0065] (2) Loaded catalyst precursor:

[0066] Disperse 0.2g of porous silicon matrix and 0.03g of cobalt ...

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Abstract

The invention discloses a silicon carbon composite material and a preparation method thereof. The material disclosed by the invention comprises a porous silicon substrate, a one-dimensional carbon nano material and amorphous carbon, wherein the one-dimensional carbon nano material is a carbon nano tube or carbon nano fiber. The preparation method disclosed by the invention comprises the following steps: preparing the porous silicon substrate; loading a catalyst precursor; and carrying out the chemical vapor deposition. The one-dimensional carbon nano material directly grows on the porous silicon substrate, and the one-dimensional carbon nano material and the porous silicon substrate are coated with the amorphous carbon. The silicon carbon composite material provided by the invention is suitable for the cathode material of a lithium ion battery, and has the advantages of high capacity and stable circulation performance. A constant-current charge and discharge test is carried out under the 300mA / g current density, and the silicon carbon composite material disclosed by the invention has the characteristics that the first reversible capacity is 1149mAh / g; the reversible capacity is 1087mAh / g after the circulation is carried out for 100 times; and the capacity conservation rate is up to 95%.

Description

technical field [0001] The invention relates to a functional inorganic composite material and a preparation method thereof, in particular to a silicon-carbon composite material and a preparation method thereof, which are applied to negative electrode materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high discharge voltage, long cycle life, and no memory effect, and have been widely used in portable electronic devices such as mobile phones, digital cameras, and notebook computers. If its energy density and safety performance are further improved, it is expected to be applied in electric vehicles, new energy storage and other fields. In terms of anode materials for lithium-ion batteries, graphite-based carbon anode materials are currently commercially used. However, the theoretical specific capacity of graphite is only 372mAh / g, and the lithium intercalation platform is too low (<0.1V), which is prone to metal li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 杨军高鹏飞贾海平王久林努丽燕娜
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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