Meso-porous silicon-copper compound electrode material, and preparation method and application thereof

An electrode material and mesoporous silicon technology, applied in the field of mesoporous silicon-copper composite electrode materials and their preparation, can solve the problems of poor high-rate discharge capability and poor conductivity of porous silicon, and achieve a small capacity loss rate and offset internal Stress, the effect of suppressing pulverization

Inactive Publication Date: 2017-11-24
SOUTHEAST UNIV
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Problems solved by technology

However, pure porous silicon has poor conductivity, poor high-rate discharge capability, and the capacity decline is still serious after multiple cycles.

Method used

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  • Meso-porous silicon-copper compound electrode material, and preparation method and application thereof
  • Meso-porous silicon-copper compound electrode material, and preparation method and application thereof
  • Meso-porous silicon-copper compound electrode material, and preparation method and application thereof

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preparation example Construction

[0018] The present invention also provides the preparation method of the mesoporous silicon-copper composite electrode material, comprising: performing magnesia thermal reduction reaction on the mixture of magnesium powder and mesoporous silicon dioxide; performing impregnation-hydrogen reduction on the mesoporous silicon, A mesoporous silicon-copper composite was prepared.

[0019] The temperature of the magnesium thermal reaction is 400-700°C, can be 400-600°C, 600-700°C, etc., the holding time is 0-20h, and the heating rate is 0.5-10°C / min. The holding time is 0h, and the reaction temperature is 400-600°C by-product Mg 2 Si content is relatively high, the mass percentage is about 10%, as the temperature increases, the by-product Mg 2 Si content decreased gradually, when the reaction temperature was 650℃, Mg 2 Si content is about 4.2%, when it rises to 700°C, Mg 2 Si content is less than 1%. The by-product Mg can be reduced by increasing the holding time 2 Si content. ...

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Abstract

The invention discloses a meso-porous silicon-copper compound electrode material, and a preparation method and an application thereof. The meso-porous silicon-copper compound electrode material has a 10-100nm porous structure, the specific surface is 60-300m<2> / g and the mass fraction of copper accounts for 15-75%. The preparation method comprises the following steps: performing a magnesium thermal reaction on the mixture of magnesium powder and mesoporous silica to prepare meso-porous silicon; and preparing the meso-porous silicon-copper compound by using a dipping-hydrogen reduction method. The invention further provides an application of the meso-porous silicon-copper compound electrode material in the preparation of lithium ion battery cathodes. The meso-porous silicon-copper compound electrode material provided by the invention has the advantages of high reversible capacity, good circulation stability, high multiplying performance and large scale production, etc.

Description

technical field [0001] The invention relates to a high-capacity, long-life and low-cost mesoporous silicon-copper composite electrode material and a preparation method thereof, belonging to the technical field of battery material manufacturing. Background technique [0002] The superior performance of lithium-ion batteries makes them have broad application prospects in portable electronic devices, electric vehicles, and aerospace. [0003] At present, the commercial negative electrode materials are still mainly graphite carbon-based carbon materials, and their maximum theoretical specific capacity is only 372mAh / g, which restricts the further improvement of lithium battery capacity. Silicon is considered to be the most promising electrode material with a theoretical capacity as high as 4200mAh / g (Li 4.4 Si alloy), which is about 10 times the theoretical specific capacity of carbon anode materials, and using it as the anode of lithium-ion batteries can greatly increase the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 张耀何凌潇相梦园
Owner SOUTHEAST UNIV
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