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Metal organic-based silicon alloy composite negative electrode material and preparation method thereof

A technology of metal organics and negative electrode materials, which is applied in the field of silicon alloy composite negative electrode materials based on metal organics and their preparation, can solve the problems that metals and carbon and nitrogen elements are not fully utilized, and achieve mild reaction conditions, easy availability of materials, The effect of high conductivity

Active Publication Date: 2018-09-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing research on the improvement of silicon anodes by metal-organic chemicals mainly uses organic frameworks as templates, which are eventually removed, and the metals and carbon and nitrogen elements in the organic frameworks have not been fully utilized.

Method used

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  • Metal organic-based silicon alloy composite negative electrode material and preparation method thereof
  • Metal organic-based silicon alloy composite negative electrode material and preparation method thereof
  • Metal organic-based silicon alloy composite negative electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0058] At room temperature, 1 g of nickel ferricyanide nanoparticles was evenly dispersed into a mixed solution of 200 mL of ethanol and 300 mL of deionized water, and 30 mL of concentrated ammonia water was added, stirred and dispersed for 0.5 h, and recorded as solution A.

[0059] Dissolve 8 mL of tetraethyl orthosilicate in 500 ml of ethanol and quickly add solution A, stir rapidly at 1200 rpm for 3 min, then slowly stir at 350 rpm for 2 h. The obtained material was separated by centrifugation at 9000rpm for 5min, washed once with 100mL deionized water and ethanol respectively, and dried in an oven at 80°C for 4h. The obtained material, magnesium powder and sodium chloride were mixed and ground at a mass ratio of 1:0.8:10, placed in a closed metal container and placed in an argon tube furnace, and the tube furnace was heated to 650°C at 2°C / min Keep the temperature constant for 5 hours, then cool down naturally. The obtained material was soaked in 5% hydrochloric acid for...

Embodiment 2

[0065] At room temperature, 1 g of ferric ferricyanide nanoparticles was uniformly dispersed into a mixed solution of 200 mL of ethanol and 300 mL of deionized water, and 50 mL of concentrated ammonia water was added, stirred and dispersed for 2 h, and recorded as solution A.

[0066] Dissolve 5mL tetraethyl orthosilicate in 500ml ethanol and quickly add solution A, stir rapidly at 800rpm for 3min, then slowly stir at 200rpm for 2h. The obtained material was separated by centrifugation at 9000rpm for 5min, washed once with 100mL deionized water and ethanol respectively, and dried in an oven at 80°C for 4h. Take the obtained material, magnesium powder and sodium chloride, mix and grind them evenly in a mass ratio of 1:0.2:10, place them in a closed metal container and place them in an argon furnace tube furnace, and the tube furnace is heated at 10°C / min to Keep the temperature at 700°C for 5 hours, then cool down naturally. The obtained material was soaked in 15% hydrochloric...

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Abstract

The invention discloses a metal organic-based silicon alloy composite negative electrode material and a preparation method thereof. The preparation process comprises the following steps that Prussianblue nanoparticles are dispersed into a solvent and then added with alkali for complexing, then an organosilicon precursor solution is added, and after stirring condensation and coating and centrifugal separation are conducted, washing is conducted to obtain a precursor; the obtained precursor, magnesium powder and sodium chloride are mixed and heated to be co-reduced, and a silicon alloy matrix is prepared; the silicon alloy matrix is soaked and washed with a diluted hydrochloric acid solution to obtain a silicon alloy negative electrode material; and the silicon alloy negative electrode material is dispersed into a carbon source, after ultrasonic dispersing and stirring are conducted, freeze drying is conducted, calcinations is conducted in an argon atmosphere, and then the silicon alloycomposite negative electrode material inheriting the special nanostructure of the Prussian particles is prepared. According to the silicon alloy composite negative electrode material, the organic phases are subjected to shrinkage and pyrolysis to form nitrogen-doped carbon, the inorganic phases are co-reduced to form silicon alloy, and the alloy-carbon phase structure solves the problems of low conductivity and size changes of the silicon electrode material.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery materials, in particular to a metal-organic-based silicon alloy composite negative electrode material and a preparation method thereof. Background technique [0002] The distribution of emerging energy has uncertainty in space and time, and the use of these energies has prompted changes in the form of energy conversion and transmission. Lithium-ion batteries have become one of the most promising chemical energy storage and conversion devices due to their high energy density, long service life, and environmental protection. With the development of new energy vehicles and large-scale energy storage systems, further improving the energy density of batteries has become the focus of current research. The energy density of the battery mainly depends on the electrode material. The traditional graphite anode material is limited by its theoretical specific capacity (372mAh / g), w...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/362H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 郭华军周玉李新海王志兴彭伟佳王接喜彭文杰胡启阳
Owner CENT SOUTH UNIV
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