Anode material for lithium-ion battery and preparation method and application of anode material

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of easy expansion of silicon-containing negative electrode materials, battery capacity attenuation, etc., and achieve the effects of low cost, simple operation, and industrialized production.

Inactive Publication Date: 2015-11-04
INST OF NEW ENERGY SHENZHEN
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Problems solved by technology

[0007] The purpose of the present invention is to provide a lithium ion battery negative electrode material to solve the problem

Method used

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  • Anode material for lithium-ion battery and preparation method and application of anode material
  • Anode material for lithium-ion battery and preparation method and application of anode material
  • Anode material for lithium-ion battery and preparation method and application of anode material

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preparation example Construction

[0027] Correspondingly, an embodiment of the present invention also provides a method for preparing a negative electrode material of a lithium ion battery, comprising the following preparation steps:

[0028] S01. Preparation of basic raw materials: obtaining silicon / carbon composite materials;

[0029] S02. Formation of the first negative electrode material: atomize the metal salt solution, and coat the atomized metal salt solution on the fluidized silicon / carbon composite material to obtain a precursor film; After the precursor thin film is sintered and annealed at high temperature, the first negative electrode material coated with the metal oxide coating layer is obtained, wherein the metal salt solution can be sintered at high temperature and annealed to obtain the corresponding metal oxide. The metal oxide includes but not limited to at least one of aluminum oxide, silicon oxide, titanium oxide, magnesium oxide, zinc oxide, and zirconium oxide.

[0030]Specifically, in t...

Embodiment 1

[0038] 1. Use self-made or purchased natural graphite, graphene, nano-carbon fiber or expanded graphite as the basic composite material raw material, that is, the carbon core layer raw material;

[0039] 2. Bake the above raw materials in an oven at 100-120 degrees Celsius for 12-24 hours to remove the moisture;

[0040] 3. Put the raw materials treated in step 2 into the CVD reactor, and pass the silane gas into the CVD reactor under the condition of 300-800 degrees Celsius for thermal decomposition reaction, so that the silicon element is deposited on the surface of the carbon core layer to form a certain thickness Metal silicon film or nano-scale silicon particles, the specific deposition time is 30-360min, to obtain a metal silicon film or metal silicon particles with a thickness of 20-200nm or 10-100nm;

[0041] 4. After the CVD deposition reaction in the previous step, carbon / silicon composite material particles were obtained;

[0042] 5. The carbon / silicon composite pa...

Embodiment 2

[0047] 1. Using self-made multi-layer 2-10 layer graphene as the carbon core layer raw material;

[0048] 2. Bake the above raw materials in an oven at 120°C for 24 hours to remove the moisture;

[0049] 3. Put the raw materials treated in step 2 into a CVD reactor, and put silane gas into the reactor at a rate of 100 sccm at 550°C for decomposition reaction and then deposit. The deposition time is 120 minutes, and the silane is decomposed to form a uniform thickness (40nm ) of silicon nanoparticles.

[0050] 4. Obtained graphene / silicon composite material particles through the CVD deposition reaction of the previous step.

[0051] 5. The graphene / silicon composite particle obtained in step 4 is used as the raw material particle for the next step for subsequent use.

[0052] 6. With aluminum isopropoxide as raw material, be configured into the aluminum isopropoxide solution of 0.2g / ml, be 1.5%: 1 coating amount with above-mentioned graphene / silicon composite material mass ra...

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Abstract

The invention discloses an anode material for a lithium-ion battery. The anode material comprises a carbon core layer and a silicon wrapping layer. The silicon wrapping layer wraps the carbon core layer to form a silicon/carbon composite material. The anode material further comprises a metallic oxide wrapping layer serving as the outer wrapping layer of the silicon/carbon composite material. The anode material solves the problem that due to the fact that a silicon-contained anode material is prone to expansion, the battery capacity is rapidly reduced. The invention further discloses a preparation and application of the anode material for the lithium-ion battery. The preparation method includes the step of conducting high-temperature annealing to form the anode material after the silicon/carbon composite material is fluidified and wrapped by a metal salt solution. The lithium-ion battery more excellent in performance can be obtained when the anode material is applied.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery negative electrode material and a preparation method and application thereof. Background technique [0002] With the development of society and technology, lithium-ion battery anode materials are constantly being updated. [0003] Initially, commercial lithium-ion batteries mainly used graphite-like carbon materials as negative electrode active materials. However, due to its low specific capacity (372mAh / g), carbon-based anode materials cannot meet the requirements of miniaturization of electronic equipment and high power and high capacity of lithium-ion batteries for vehicles. Therefore, it is necessary to develop alternative carbon materials with high energy density. , high safety performance, long cycle life of the new lithium-ion battery anode materials. [0004] Therefore, people use traditional metal silicon as the negative electrode material of lithium-ion b...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/36H01M4/133
CPCY02E60/10
Inventor 丁显波慈立杰夏进阳杨杰
Owner INST OF NEW ENERGY SHENZHEN
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