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Lithium ion battery composite silicon negative electrode material and preparation method thereof

A lithium-ion battery, silicon anode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of increased polarization, poor uniformity of composite silicon anode materials, etc., to improve platform voltage, improve cycle performance, and improve power. The effect of academic performance

Pending Publication Date: 2018-09-18
SHENZHEN BAK POWER BATTERY CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery composite silicon negative electrode material and its preparation method, aiming to solve the problems of poor uniformity and increased polarization of the existing composite silicon negative electrode material using heterogeneous silicon oxide as raw material

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  • Lithium ion battery composite silicon negative electrode material and preparation method thereof
  • Lithium ion battery composite silicon negative electrode material and preparation method thereof
  • Lithium ion battery composite silicon negative electrode material and preparation method thereof

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preparation example Construction

[0046] Another aspect of the embodiments of the present invention provides a method for preparing a lithium-ion battery composite silicon negative electrode material, comprising the following steps:

[0047] S01. Provide silicon oxide particles, use chemical vapor deposition method, coat carbon material on the surface of the silicon oxide particles, and prepare carbon-coated silicon oxide particles, and the silicon oxide particles are silicon oxide particles that have not been disproportionated. silicon particles;

[0048] S02. Configure the mixed solution of the carbon-coated silicon oxide, soft carbon precursor, and carbon matrix, spray-dry and granulate the mixed solution to obtain a first precursor compound; compound the first precursor The material is subjected to the first heat treatment to obtain the second precursor compound;

[0049] S03. Mixing the second precursor compound with the carbon material precursor to prepare a silicon-carbon composite precursor, and subje...

Embodiment 1

[0077] A preparation method of lithium-ion battery composite silicon negative electrode material, comprising the following steps:

[0078] S11. Perform mechanical ball milling of 7 g of homogeneous silicon oxide that has not undergone disproportionation reaction to obtain silicon oxide particles with a particle size of 0.1 to 5.0 μm; place the silicon oxide particles in a C 2 h 2 、H 2 , Ar atmospheric pressure environment, C 2 h 2 The flow rate is 20ml / min, H 2 The flow rate is 5ml / min, the Ar flow rate is 100ml / min, and heated at a constant temperature of 600°C for 5 hours to obtain carbon-coated silicon oxide;

[0079] S12. Disperse the carbon-coated silicon oxide and 100 g of spherical graphite with a particle size of 0.5-15 μm in isopropanol at a stirring rate of 1200 rpm for 1.0 hour to obtain a solution with a solid content of 5%. . 5 g of citric acid was added to ethanol, the stirring speed was 1200 rpm, and the stirring time was 1.5 hours to obtain soft carbon pr...

Embodiment 2

[0084] A preparation method of lithium-ion battery composite silicon negative electrode material, comprising the following steps:

[0085] S21. Perform mechanical ball milling of 7 g of homogeneous silicon oxide that has not undergone disproportionation reaction to obtain silicon oxide particles with a particle size of 0.1 to 5.0 μm; place the silicon oxide particles in a C 2 h 2 、H 2 , Ar atmospheric pressure environment, C 2 h 2 The flow rate is 40ml / min, H 2 The flow rate is 10ml / min, the Ar flow rate is 150ml / min, and heated at a constant temperature of 700°C for 4 hours to obtain carbon-coated silicon oxide;

[0086] S22. Disperse the carbon-coated silicon oxide and 100 g of artificial graphite with a particle size of 0.5-15 μm in isopropanol at a stirring rate of 1200 rpm for 1.0 hour to obtain a solution with a solid content of 5%. . 5 g of citric acid was added to ethanol, the stirring speed was 1200 rpm, and the stirring time was 1.5 hours to obtain soft carbon ...

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Abstract

The invention provides a preparation method of a lithium ion battery composite silicon negative electrode material. The method includes the following steps: providing silicon oxide particles, and coating a carbon material on the surfaces of the silicon oxide particles by using a chemical vapor deposition method to obtain carbon-coated silicon oxide; configuring a mixed solution of the carbon-coated silicon oxide, a soft carbon precursor and a carbon matrix, and performing spray drying granulation on the mixed solution to obtain a first precursor complex; performing first heat treatment on thefirst precursor complex to obtain a second precursor complex; and mixing the second precursor complex with a carbon material precursor to prepare a silicon-carbon composite precursor, and performing second heat treatment on the silicon-carbon composite precursor to obtain the lithium ion battery composite silicon negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a composite silicon negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] In recent years, the development of hybrid electric vehicles and pure electric vehicles has become faster and faster. At the same time, the country's support for the new energy industry has been increasing. Lithium-ion batteries, as the power system of the new energy industry, are in a state of rapid development. The anode materials of traditional lithium-ion batteries are mainly graphite materials such as natural graphite, artificial graphite or composite graphite, and the theoretical gram capacity of graphite materials is only 372mAh / g. Although with the development of technology, the actual reversible gram capacity of graphite materials is gradually increasing, but it is only infinit...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 夏进阳杨春媛林森安伟峰林建
Owner SHENZHEN BAK POWER BATTERY CO LTD
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