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

A technology of silicon oxide and negative electrode materials, 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 conductivity of SiO2, ion conductivity, and distribution uniformity Problems such as inability to be strictly controlled to achieve the effects of alleviating electronic contact deactivation, improving cycle performance, and improving kinetic performance

Active Publication Date: 2020-04-28
SHENZHEN BAK POWER BATTERY CO LTD
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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 monoxide composite negative electrode material, preparation method thereof and lithium ion battery
  • Silicon monoxide composite negative electrode material, preparation method thereof and lithium ion battery
  • Silicon monoxide composite negative electrode material, 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, the silicon oxide powder is silicon oxide powder without disproportionation treatment;

[0035] S2. Carrying out carbon coating 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. Performing 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 mixing the silicon powder and the silicon dioxide powder uniformly, heating to generate silicon monoxide gas in an inert atmosphere or a vacuum environment, and then cooling and precipitating to obtain SiO2 block: crushing and pulverizing t...

Embodiment 1

[0066] Silicon oxide composite negative electrode material, its preparation method steps are as follows:

[0067] S1. Provide silicon oxide powder, the silicon oxide powder is silicon oxide powder without disproportionation treatment; the preparation method of the silicon oxide powder is: mix silicon powder and silicon dioxide powder evenly Finally, in an inert atmosphere or a vacuum environment, heat up to 1400 ° C to generate silicon monoxide gas, cool and precipitate on the deposition plate to obtain a silicon oxide block; the silicon oxide block is broken by a jaw crusher into Particles with an average particle size of 0.5-8 mm are then pulverized and pulverized by airflow to obtain silicon oxide powder with a particle size D50 of 0.1-1 μm; wherein the molar ratio of the silicon powder to the silicon dioxide powder is 0.5:0.5; The particle size D50 of the silicon powder is 1-100 μm, the particle size D50 of the silicon dioxide powder is 0.01-1 μm; the chemical formula of t...

Embodiment 2

[0072] Silicon oxide composite negative electrode material, its preparation method steps are as follows:

[0073] S1. Provide silicon oxide powder, the silicon oxide powder is silicon oxide powder without disproportionation treatment; the preparation method of the silicon oxide powder is: mix silicon powder and silicon dioxide powder evenly Finally, in an inert atmosphere or a vacuum environment, heat up 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 into Particles with an average particle size of 0.5-8 mm are then pulverized and pulverized by airflow to obtain silicon oxide powder with a particle size D50 of 0.1-1 μm; wherein, the molar ratio of the silicon powder to the silicon dioxide powder is 0.6:0.4; The particle size D50 of the silicon powder is 1-100 μm, the particle size D50 of the silicon dioxide powder is 0.01-1 μm; the chemical for...

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Abstract

The invention discloses a silicon monoxide composite negative electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the steps of S1, providing silicon monoxide powder, wherein the silicon monoxide powder is silicon monoxide powder without being subjected to disproportionation treatment; S2, carrying out carbon coating on the silicon monoxide powder to obtain a first precursor; S3, growing carbon nanofibers on the surface of the first precursor in situ to obtain a second precursor; and S4, carrying out secondary granulation on the second precursor to obtain the silicon monoxide composite negative electrode material. In the invention, carbon coating is carried out on the silicon monoxide powder to obtain the first precursor, and the carbon nanofibers grow on the surface of the first precursor in situ, so that the silicon monoxide powder can be well connected to form a good conductive network, the defect that silicon monoxide is poorin conductivity is relieved, the initial efficiency is further improved, and the volume effect of the silicon monoxide composite negative electrode material is improved.

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 as anode materials in lithium-ion batteries, mainly because of their rich source of raw materials, high first-time coulombic efficiency, excellent cycle performance, and relatively low cost and price. However, with the advancement of science and technology, higher requirements have been placed on the energy density of lithium-ion batteries in the 3C digital and electric vehicle fields where lithium-ion batteries are used the most. The capacity has gradually failed 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 promising new anode material that is most likely to be industri...

Claims

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Application Information

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Patent Type & Authority Applications(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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