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

A metal-organic and anode material technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of insufficient utilization of metals and carbon and nitrogen elements, and achieve mild reaction conditions, easy availability of materials, and good cycle performance. Excellent rate performance

Active Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] At room temperature, uniformly disperse 1 g of nickel ferricyanide nanoparticles into a mixed solution of 200 mL of ethanol and 300 mL of deionized water, add 30 mL of concentrated ammonia, and stir and disperse for 0.5 h, which is recorded as A solution.

[0059] Dissolve 8 mL of ethyl orthosilicate in 500 mL of ethanol and quickly add the A solution, stir quickly at 1200 rpm for 3 min, and then slowly stir at 350 rpm for 2 h. The obtained materials were separated by centrifugation at 9000 rpm for 5 minutes, washed with 100 mL of deionized water and ethanol, and dried in an oven at 80°C for 4 hours. Take the obtained material, magnesium powder and sodium chloride at a mass ratio of 1:0.8:10, mix and grind uniformly, place them in a closed metal container and transfer them into an argon tube furnace. The tube furnace is heated at 2°C / min to 650°C Keep at constant temperature for 5h, then cool down naturally. The obtained material was immersed in 5% hydrochloric acid for 1...

Embodiment 2

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

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

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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 present invention relates to the technical field of lithium ion battery material preparation, 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 sources is uncertain in space and time, and the use of these energy sources promotes changes in energy conversion and transmission forms. Lithium-ion batteries have become one of the most promising chemical energy storage and conversion devices because of their high energy density, long service life, and green 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 current research focus. The energy density of the battery mainly depends on the electrode material. The traditional graphite anode material is limited by its theoretical specific capacity (372mA...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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