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Silicon-based negative electrode, preparation method and application thereof

A silicon-based negative electrode, silicon layer technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of limited application and poor product cycle stability.

Active Publication Date: 2021-05-14
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume expansion of silicon is as high as 300% during the de-lithiation / intercalation process, and the severe volume effect will eventually lead to poor cycle stability of the product, which limits its practical application.

Method used

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  • Silicon-based negative electrode, preparation method and application thereof
  • Silicon-based negative electrode, preparation method and application thereof

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preparation example Construction

[0028] The present invention also provides a method for preparing a silicon-based negative electrode described in the above technical solution, comprising the following steps:

[0029] providing a current collector with a silicon layer;

[0030] Mixing the aluminum sol with ethanol to obtain the aluminum sol coating material;

[0031] The aluminum sol coating material is coated on the surface of the silicon layer to obtain the silicon-based negative electrode.

[0032] In the present invention, unless otherwise specified, all raw materials are commercially available products well known to those skilled in the art.

Embodiment 1

[0040] According to the mass ratio of 8:1:1, 32 mg of silicon with a particle size of 80 nm, 4 mg of polyacrylic acid and 4 mg of acetylene black were mixed and ground in a mortar for 10 minutes, and then 2.5 g of N-methylpyrrolidone was added and mixed evenly to obtain a coating slurry ;

[0041] The 2.5g coating slurry was uniformly scraped and coated on the copper foil, and aired in a drying oven at room temperature for 10 minutes under vacuum to obtain a current collector with a silicon layer (the thickness of the silicon layer is 15 μm);

[0042] According to the mass ratio of 1:30, 20 g of aluminum sol with a mass concentration of 20% and 120 g of absolute ethanol were mixed, and stirred at room temperature for 24 hours to obtain an aluminum sol coating material;

[0043] The aluminum sol coating material was blade-coated on the surface of the silicon layer, and vacuum-dried at 80° C. for 12 hours to obtain a silicon-based negative electrode (the thickness of the aluminu...

Embodiment 2

[0045] According to the mass ratio of 8:1:1, 32 mg of silicon with a particle size of 80 nm, 4 mg of polyacrylic acid and 4 mg of acetylene black were mixed and ground in a mortar for 10 minutes, and then 2.5 g of N-methylpyrrolidone was added and mixed evenly to obtain a coating slurry ;

[0046] The 2.5g coating slurry was uniformly scraped and coated on the copper foil, and aired in a drying oven at room temperature for 10 minutes under vacuum to obtain a current collector with a silicon layer (the thickness of the silicon layer is 15 μm);

[0047] According to the mass ratio of 1:20, 30 g of aluminum sol with a mass concentration of 20% and 120 g of absolute ethanol were mixed, and stirred at room temperature for 24 hours to obtain an aluminum sol coating material;

[0048] The aluminum sol coating material was scraped-coated on the surface of the silicon layer, wherein the height of the scraper was 15 μm, and vacuum-dried at 80° C. for 12 hours to obtain a silicon-based n...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a silicon-based negative electrode, a preparation method and application thereof. The invention provides a silicon-based negative electrode. The silicon-based negative electrode comprises a current collector, a silicon layer and an aluminum sol coating layer which are sequentially stacked. The aluminum sol coating layer on the surface of the silicon layer can reduce the volume expansion of silicon in the lithium intercalation / deintercalation process, so that the cycle performance of the silicon-based negative electrode material is improved. According to the record of the embodiment, the capacity retention ratio of the silicon-based negative electrode is 45.09%-90.93% after 50 cycles of charging and discharging under the current density of 0.1A / g, and the capacity retention ratio is greatly improved compared with the capacity retention ratio of 38.85% of a silicon-based negative electrode without the aluminum sol coating layer.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a silicon-based negative electrode and a preparation method and application thereof. Background technique [0002] In recent years, lithium-ion batteries have become an important part of people's lives and are widely used in various consumer electronics products, electric vehicles and new energy storage. The anode material battery system with higher specific capacity, high cycle stability, high rate performance and high safety is still a hot spot for people to explore and research. Silicon materials are considered to be one of the most promising alternative materials for commercial carbon materials due to their high theoretical specific capacity (4200mAh / g), low lithium extraction / intercalation potential, and abundant element reserves. However, the volume expansion of silicon is as high as 300% during the delithiation / intercalation process, and the severe volume ef...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/62H01M4/1395H01M10/0525
CPCH01M4/134H01M4/628H01M4/1395H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 张新宇王海丽秦家千刘日平
Owner YANSHAN UNIV
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