Preparation method of aluminum oxide coated silicon cathode material

A negative electrode material, a technology for coating silicon, which is applied to battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of low efficiency, high cost, and difficult coating of powder materials, and achieves simple reaction raw materials, low cost, and low cost. Simple and easy operation

Active Publication Date: 2016-09-21
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Application Information

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Problems solved by technology

However, ALD requires the use of flammable and explosive organoaluminum compounds and a complex va

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  • Preparation method of aluminum oxide coated silicon cathode material
  • Preparation method of aluminum oxide coated silicon cathode material
  • Preparation method of aluminum oxide coated silicon cathode material

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preparation example Construction

[0025] The invention provides a method for preparing an aluminum oxide-coated silicon negative electrode material, comprising the following steps:

[0026] A) Under an oxygen-containing atmosphere, subject the nano-silicon powder to heat treatment at 500-1000° C. to obtain pre-oxidized nano-silicon;

[0027] B) mixing the pre-oxidized nano-silicon with aluminum powder and tin powder, and undergoing heat treatment at 400-900° C. to obtain an intermediate;

[0028] C) Treating the intermediate with an acid or an oxidizing agent to obtain an alumina-coated silicon negative electrode material.

[0029] The preparation process provided by the invention is simple and easy to operate, and the cost is low; the silicon-based negative electrode material prepared by the invention has excellent comprehensive performance.

[0030] In the embodiment of the present invention, the nano-silicon powder is placed in a reaction vessel, and heat-treated in an oxygen-containing atmosphere. Through...

Embodiment 1

[0044] Put 0.2 g of 100nm (D50) nano-silicon powder in a tube furnace and treat it at 650° C. for 2 hours in an oxygen atmosphere to obtain pre-oxidized nano-silicon powder. After cooling down, the pre-oxidized silicon powder was evenly mixed with 2 grams of metal aluminum powder and 1 gram of metal tin powder, and then treated at 560° C. for 2 hours in an argon atmosphere to obtain an intermediate. Among them, the heating rate of heat treatment is 5°C / min; the cooling method is natural cooling.

[0045] After cooling down, process the intermediate with concentrated hydrochloric acid (mass percent is 37%), and unreacted metal powder is dissolved until no bubbles are produced, and the metal powder is completely dissolved; the nano silicon powder is separated from the reacted solution with a centrifuge , and then washed several times with deionized water (there will be a certain loss in the cleaning process); the cleaned nano-silicon product is placed in a vacuum oven at 80 ° C ...

Embodiment 2

[0049] Put 0.2 g of 100nm (D50) nano-silicon powder in a tube furnace, and treat it at 750° C. for 1 hour in an oxygen atmosphere to obtain pre-oxidized nano-silicon powder. After cooling down, the pre-oxidized silicon powder was evenly mixed with 2 grams of metal aluminum powder and 1 gram of metal tin powder, and then treated at 560° C. for 2 hours in an argon atmosphere to obtain an intermediate. Among them, the heating rate of heat treatment is 5°C / min; the cooling method is natural cooling.

[0050] After cooling down, process the intermediate with the concentrated hydrochloric acid of Example 1, and dissolve the unreacted metal powder until no bubbles are produced, and the metal powder is completely dissolved; the nano silicon powder is separated from the reacted solution with a centrifuge, and then After washing with deionized water for several times, the cleaned nano-silicon product was dried in a vacuum oven at 80° C. for 24 hours to obtain 0.18 g of alumina-coated na...

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Abstract

The invention provides a preparation method of an aluminum oxide coated silicon cathode material. The preparation method comprises the following steps: (A) in an oxygen-containing atmosphere, carrying out heat treatment of 500-1000 DEG C on nanometer silicon powder to obtain preoxidized nanometer silicon; (B) mixing the preoxidized nanometer silicon with aluminum powder and tin powder, and carrying out heat treatment of 400-900 DEG C to obtain an intermediate; and (C) treating the intermediate with acid or an oxidant to obtain the aluminum oxide coated silicon cathode material. In the preparation method, the thickness of an aluminum oxide coating layer can be controlled by adjusting the technological conditions of nanometer silicon preoxidization; the reaction raw materials are simple, flammable and combustible organic reactants and complex vacuum systems do not need to be used in the preparation process, the operation process is simple and practicable, the practicability degree is high, and the cost is low. The silicon substrate cathode material prepared and obtained by the preparation method has more stable surface structure in the lithium deembedding and embedding process, and is high in capacity retention ratio, high in cycling stability and high in performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a method for preparing an aluminum oxide-coated silicon negative electrode material. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, high energy density, high working voltage, low self-discharge rate, small size and light weight, and have been widely used in various portable electronic devices, backup power supplies, energy storage batteries and electric vehicles, etc. . At present, the mainstream commercial lithium-ion battery anode materials are carbon-based anode materials, among which graphite is the most widely used, and its theoretical specific capacity is 372mAh / g, but the capacity in actual batteries is very close to its limit capacity. As people's requirements for the energy density of lithium-ion batteries are getting higher and higher, the development of new lithium-ion battery anode materials with high...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/366H01M4/386H01M10/0525Y02E60/10
Inventor 徐凯琪苏伟魏增福钟国彬王超
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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