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Silicon-based anode material and preparation method thereof and application thereof

A silicon-based negative electrode material, nano-silicon technology, applied in battery electrodes, electrical components, electrochemical generators, etc., to achieve the effects of improving cycle stability, low energy consumption, and uniform compounding

Inactive Publication Date: 2019-04-05
ZOTYE INT AUTOMOBILE TRADING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although nanonization and compounding can improve the cycle performance of silicon-based negative electrodes, it is still a big challenge to realize the simple and large-scale preparation of nano-silicon-based materials.

Method used

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  • Silicon-based anode material and preparation method thereof and application thereof
  • Silicon-based anode material and preparation method thereof and application thereof
  • Silicon-based anode material and preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for preparing a silicon-based negative electrode material, comprising the following steps:

[0045] 1) First burn diatomite in air at 800°C for 2 hours, then wash the burnt product with 6mol / L hydrochloric acid for 12 hours, and wash it with deionized water until neutral to obtain pure silicon oxide;

[0046] 2) The pure silicon oxide prepared in step 1) is mixed with magnesium powder and sodium chloride through ball milling, the ball milling speed is 180r / min, and the ball milling time is 10 hours to obtain a mixture; the mol ratio of magnesium powder to pure silicon oxide is 2: 1. The weight ratio of sodium chloride to pure silicon oxide is 6:1;

[0047]3) The mixture prepared in step 2) is placed in a tube furnace, and argon gas is introduced to carry out a magnesia thermal reduction reaction with a reaction temperature of 800° C. and a reaction time of 10 hours; to obtain a magnesia thermal reaction product;

[0048] 4) The magnesium thermal reaction produ...

Embodiment 2

[0062] A method for preparing a silicon-based negative electrode material, comprising the following steps:

[0063] 1) First burn kaolin in air at 800°C for 2 hours, then wash the burnt product with 6mol / L hydrochloric acid for 12 hours, and wash it with deionized water until neutral to obtain pure silicon oxide;

[0064] 2) The pure silicon oxide prepared in step 1) is mixed with aluminum powder and potassium chloride through ball milling, the ball milling speed is 180r / min, and the ball milling time is 10 hours to obtain a mixture; the mol ratio of aluminum powder to pure silicon oxide is 4.0: 3. The weight ratio of potassium chloride to pure silicon oxide is 7:1;

[0065] 3) placing the mixture prepared in step 2) in a tube furnace, feeding argon gas, and performing a magnesia thermal reduction reaction, the reaction temperature is 850°C, and the reaction time is 5 hours; a magnesia thermal reaction product is obtained;

[0066] 4) The magnesium thermal reaction product pr...

Embodiment 3

[0072] A method for preparing a silicon-based negative electrode material, comprising the following steps:

[0073] 1) Burn the quartz sand in the air at 800°C for 2 hours, then wash the burnt product with 6mol / L hydrochloric acid for 12 hours, and wash it with deionized water until neutral to obtain pure silica;

[0074] 2) The pure silicon oxide prepared in step 1) is mixed with magnesium powder and magnesium chloride through ball milling, the ball milling speed is 180r / min, and the ball milling time is 10 hours to obtain a mixture; the molar ratio of magnesium powder to pure silicon oxide is 2.1:1, The weight ratio of magnesium chloride to pure silicon oxide is 9:1;

[0075] 3) The mixture prepared in step 2) is placed in a tube furnace, and argon gas is introduced to carry out a magnesia thermal reduction reaction with a reaction temperature of 750° C. and a reaction time of 15 hours; a magnesia thermal reaction product is obtained;

[0076] 4) The magnesium thermal react...

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Abstract

The invention discloses a silicon-based anode material and a preparation method and application thereof. Specifically, a commercial silicon-containing material is subjected to high-temperature burningand pickling to obtain silicon oxide, and silicon oxide is subjected to metal thermal reduction reaction to obtain a porous layer; and the surface of the nanometer silicon is coated with a polymer byemploying an in-situ polymerization method to obtain a silicon-based composite anode material. Compared with the prior art, the inexpensive silicon oxide-containing material is taken as a precursor,the metal thermal reaction is employed to prepare the nanometer silicon, the energy consumption is low, the cost is small and the period is short to facilitate large-scale production. The in-situ polymerization polymer coats the porous nano silicon so that the prepared silicon / polymer composite anode material is high in capacity and excellent in cycle performance.

Description

technical field [0001] The invention relates to the technical field of energy storage batteries, in particular to a silicon-based negative electrode material and its preparation method and application. Background technique [0002] Lithium-ion batteries are now widely used in mobile electronic devices, such as smartphones, laptops, etc., and have huge markets in grid energy storage, electric vehicles. However, with the large-scale use of lithium-ion batteries in electric vehicles, traditional graphite-based anodes cannot meet the increasing requirements of high energy density for power batteries. Compared with graphite-based negative electrodes, the theoretical capacity of silicon-based negative electrodes reaches 4200mAh / g, which has important application prospects. [0003] However, in the process of forming the lithium-silicon alloy, the volume expansion is as high as 300%, which seriously affects the cycle life of the material. At present, measures to improve the cycle...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/628H01M10/0525Y02E60/10
Inventor 牛丽媛郑东沈长海刘慧军金源谢健郭永斌
Owner ZOTYE INT AUTOMOBILE TRADING CO LTD
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