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Active anode active material, preparation method thereof and lithium ion battery

A technology of negative electrode active material and silicon material, which can be used in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., and can solve the problems of unsatisfactory cycle performance of silicon negative electrode active materials.

Active Publication Date: 2018-06-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem that the cycle performance of the existing silicon negative electrode active material is still unsatisfactory, the present invention provides a negative electrode active material with simple preparation process, good cycle performance and excellent rate performance, a preparation method thereof and a lithium ion battery

Method used

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  • Active anode active material, preparation method thereof and lithium ion battery
  • Active anode active material, preparation method thereof and lithium ion battery
  • Active anode active material, preparation method thereof and lithium ion battery

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preparation example Construction

[0021] The present invention simultaneously provides a preparation method for the above-mentioned negative electrode active material, the steps comprising:

[0022] S1, mix the solution containing the tin source with the solution containing the phosphorus source to react to obtain a suspension solution; mixing the present invention is not limited, for example, the tin source can be first configured as a solution containing the tin source, and the solution containing the tin source can be tin The aqueous solution of the source and water configuration, the phosphorus source is configured as a solution containing the phosphorus source, the solution containing the phosphorus source can be an aqueous solution of the phosphorus source and water configuration, and then their aqueous solutions are directly mixed, or the aqueous solution of the tin source is added to the phosphorus In the aqueous solution of the source, it can be stirred to make it react evenly. In the present inventio...

Embodiment 1

[0037] 4.51g of stannous chloride with 2 crystal waters is dissolved in 40ml of deionized water to form solution A, 1.85g of diammonium hydrogen phosphate is dissolved in 40ml of deionized water to form solution B, and 8g of glucose Dissolve in 40ml of deionized water to form solution C, and then add solution B dropwise to solution A under stirring conditions to form a white suspension solution. After the addition is completed, disperse 16.5g of nano-silicon in the white suspension solution and continue Stir, add solution C to the suspension solution that has been added with nano-silicon. The above reactions are all carried out in a water bath at 60°C. Finally, use ammonia water to adjust the pH value to 4.2; stir for 4 hours and stop stirring when the deionized water evaporates to half , put the product into an oven at 60° C. for drying treatment. After drying, transfer it to a tube furnace with argon gas, raise the temperature to 650°C for 4 hours at a rate of 5°C / min, and t...

Embodiment 2

[0040]Dissolve 4.3g of stannous sulfate in 30ml of deionized water to form solution A, dissolve 2.3g of diammonium hydrogen phosphate in 60ml of deionized water to form solution B, and dissolve 6g of citric acid in 30ml of deionized water to form Solution C: Add solution B dropwise to solution A under stirring conditions to form a white suspension solution. After the addition is completed, disperse 16g of nano-silicon and 4g of silicon monoxide in the white suspension solution and continue stirring. Solution C Add to the above suspension solution, the above reaction is carried out in a water bath at 80°C, and then use ammonia water to adjust the pH value to 6.8; stir for 2 hours and stop stirring when the deionized water evaporates to half, and put the product in a 100°C vacuum drying Drying in box. After drying, transfer it to a tube furnace with nitrogen, raise the temperature to 600°C at a rate of 3°C / min and keep it warm for 5 hours, then cool down naturally to obtain a na...

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Abstract

The invention provides an active anode material, a preparation method thereof and a lithium ion battery. The active anode material comprises a core and a shell covering the outer surface of the core,wherein the core comprises an amorphous stannous pyrophosphate matrix as well as a silicon material and a carbon material which are dispersed in the amorphous stannous pyrophosphate matrix, and the shell is carbon. The preparation process is simple, and the anode active material has good cycle performance and excellent rate performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, more specifically, to a negative electrode active material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, and good safety performance. At present, the negative electrode active material of commercialized lithium-ion batteries is mainly graphite. During the process of intercalating and removing lithium, the volume change of graphite is small, so it has good cycle performance. Graphite via LiC 6 Compounds reversibly store Li + , its theoretical mass specific capacity is only 372 mAh / g. Therefore, scholars at home and abroad are devoting themselves to the research and development of new anode materials. Silicon material has become a research hotspot because of its high capacity, but because of its volume effect, which affects the cycle performance of the battery, it has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 江正福
Owner BYD CO LTD
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