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Silicon oxide composite negative electrode material and preparation method thereof, and lithium ion battery

A silicon oxide and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems affecting the cycle performance of silicon oxide-based silicon carbon negative electrode materials, low SiO2 conductivity, ionic conductivity, and distribution uniformity. Inability to strictly control and other problems to achieve the effect of alleviating electronic contact inactivation, improving cycle performance, and improving kinetic performance

Active Publication Date: 2022-07-19
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

However, silicon oxide also has disadvantages such as low initial efficiency and many side reactions, and currently it is mainly used as heterogeneous silicon oxide after disproportionation reaction, and the distribution uniformity of SiO2 and Si particles formed after disproportionation reaction cannot be achieved. Strictly controlled, there will be an obvious stress difference between crystalline Si and amorphous SiO2 during the lithium intercalation process, and the low electrical conductivity and ion conductivity of SiO2 will also increase the polarization during the lithium intercalation process, which will affect the silicon oxide-based silicon carbon Cycling performance of anode materials

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  • Silicon oxide composite negative electrode material and preparation method thereof, and lithium ion battery
  • Silicon oxide composite negative electrode material and preparation method thereof, and lithium ion battery
  • Silicon oxide composite negative electrode material and preparation method thereof, and lithium ion battery

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preparation example Construction

[0033] In a first aspect, the present invention provides a method for preparing a silicon oxide composite negative electrode material, comprising the following steps:

[0034] S1. provide silicon oxide powder, and the silicon oxide powder is a silicon oxide powder without disproportionation;

[0035] S2. carbon coating is performed on the silicon oxide powder to obtain a first precursor;

[0036] S3. growing carbon nanofibers in situ on the surface of the first precursor to obtain a second precursor;

[0037] S4. Perform secondary granulation on the second precursor to obtain the silicon oxide composite negative electrode material.

[0038] Wherein, in step S1, the preparation method of the silicon oxide powder is as follows: after the silicon powder and the silicon dioxide powder are mixed uniformly, in an inert atmosphere or a vacuum environment, heating to generate silicon monoxide gas, and cooling and precipitation to obtain Silicon oxide block; crushing and pulverizing ...

Embodiment 1

[0066] The silicon oxide composite negative electrode material, the preparation method steps are as follows:

[0067] S1. provide silicon oxide powder, and the silicon oxide powder is a silicon oxide powder without disproportionation treatment; the preparation method of the silicon oxide powder is: mixing silicon powder and silicon dioxide powder uniformly Then, in an inert atmosphere or a vacuum environment, it is heated to 1400° C. to generate silicon monoxide gas, which is cooled and precipitated on a deposition plate to obtain a silicon oxide block; the silicon oxide block is crushed by a jaw crusher. Particles with an average particle size of 0.5-8mm are then pulverized and pulverized by air flow to obtain silicon oxide powder with a particle size D50 of 0.1-1 μm; wherein, the molar ratio of the silicon powder and the silicon dioxide powder is 0.5:0.5; The particle size D50 of the silicon powder is 1-100 μm, and the particle size D50 of the silicon dioxide powder is 0.01-...

Embodiment 2

[0072] The silicon oxide composite negative electrode material, the preparation method steps are as follows:

[0073] S1. provide silicon oxide powder, and the silicon oxide powder is a silicon oxide powder without disproportionation treatment; the preparation method of the silicon oxide powder is: mixing silicon powder and silicon dioxide powder uniformly Then, in an inert atmosphere or a vacuum environment, it is heated to 900 ° C to generate silicon monoxide gas, which is cooled and precipitated on a deposition plate to obtain a silicon oxide block; the silicon oxide block is crushed by a jaw crusher. Particles with an average particle size of 0.5-8mm are then pulverized and pulverized by air flow to obtain silicon oxide powder with a particle size D50 of 0.1-1 μm; wherein, the molar ratio of the silicon powder and the silicon dioxide powder is 0.6:0.4; The particle size D50 of the silicon powder is 1-100 μm, and the particle size D50 of the silicon dioxide powder is 0.01-1...

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Abstract

The invention discloses a silicon oxide composite negative electrode material, a preparation method thereof, and a lithium ion battery, comprising the following steps: S1. Providing silicon oxide powder, and the silicon oxide powder is a silicon oxide powder without disproportionation treatment ; S2. carbon coating is carried out to the silicon oxide powder to obtain a first precursor; S3. carbon nanofibers are grown in situ on the surface of the first precursor to obtain a second precursor; S4. the first precursor is The two precursors are subjected to secondary granulation to obtain the silicon oxide composite negative electrode material. In the present invention, carbon coating is performed on the silicon oxide powder to obtain a first precursor, and carbon nanofibers are grown in-situ on the surface of the first precursor, so that the silicon oxide powder can be well connected. Up to now, a good conductive network is formed, which alleviates the deficiency of poor conductivity of silicon oxide, further improves the first efficiency, and improves the volume effect of the silicon oxide composite negative electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a silicon oxide composite negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] At present, graphite materials are still widely used anode materials in lithium-ion batteries, mainly because of their abundant raw material sources, high first Coulomb efficiency, excellent cycle performance, and relatively low cost. However, with the advancement of technology, in the fields of 3C digital and electric vehicles, where lithium-ion batteries are used the most, higher requirements are placed on the energy density of lithium-ion batteries. However, the theoretical limit of 372mAh / g of traditional graphite anode materials The capacity has gradually been unable to meet the requirements of high energy density. [0003] Due to its theoretical gram capacity of 4200mAh / g, silicon anode is considered to be a very promis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 夏进阳李维潘庆瑞高红王亚捷宋华杰
Owner SHENZHEN BAK POWER BATTERY CO LTD
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