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A kind of lithiated silicon-based composite material and its preparation method and application

A technology of silicon-based composite materials and lithiation, applied in chemical instruments and methods, silicon compounds, silicates, etc., can solve the problems of low Coulombic efficiency, low conductivity of silicon-based oxide materials, lithium loss, etc., and achieve Coulombic High efficiency, reduce irreversible lithium loss, and compensate for consumption

Active Publication Date: 2021-08-20
JIANGXI IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of low electrical conductivity of the silicon-based oxide material itself and the loss of lithium during the negative electrode preparation process, resulting in low first-time Coulombic efficiency

Method used

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  • A kind of lithiated silicon-based composite material and its preparation method and application
  • A kind of lithiated silicon-based composite material and its preparation method and application
  • A kind of lithiated silicon-based composite material and its preparation method and application

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Embodiment 1

[0050] (1) Carbon-coated silicon-based oxide powder: the silicon-based oxide powder used in the present invention is a commercial silicon oxide material, i.e. SiO x , where x=1. The silicon oxide material is crushed by air flow to particles with a particle size of 1-10 μm, placed in a CVD vapor deposition furnace, and after thermal decomposition and deposition of acetylene gas at 750 ° C for 3 hours, the material is maintained in an atmosphere of inert gas protection. The temperature was raised to 900° C. at a heating rate of 5° C. / min and kept for 1 hour to obtain a silicon oxide material uniformly coated with a carbon layer.

[0051] (2) Dissolving process: dissolve biphenyl in an ultra-dry tetrahydrofuran solvent and stir to dissolve, add 350 mg of lithium flakes into a 50 mL solution under an inert atmosphere and stir magnetically for 30 minutes to obtain a homogeneous solution containing lithium and biphenyl complexes. phase solution, the concentration of aryl lithium wa...

Embodiment 2

[0059] In the dissolving process, the ether solvent was changed to 1,3-dioxolane as the solvent system, and the rest was the same as in Example 1 to prepare the negative electrode active material.

Embodiment 3

[0061] In the dissolving process, the ether solvent was changed to ethylene glycol dimethyl ether as the solvent system, and the rest was the same as in Example 1 to prepare the negative electrode active material.

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Abstract

The invention discloses a lithiated silicon-based composite material and its preparation method and application. The silicon-based composite material includes nano-silicon, silicon-based oxide, lithium silicate, and nitrogen-doped carbon coating layer , the silicate is evenly distributed in the silicon-based composite to form a homogeneous composite structure; the silicon-based composite material is impregnated with carbon-coated silicon-based oxide particles in In the solution formed by the ether organic solvent, the process of sedimentation and firing is carried out to obtain the lithiated silicon-based composite material. The composite material of the invention exhibits high first-time coulombic efficiency and excellent cycle performance when used as a lithium-ion battery negative electrode material.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithiated silicon-based composite material and a preparation method thereof. Background technique: [0002] Modern society solves the increasing shortage of non-renewable energy and environmental problems such as pollution caused by combustion and global warming through the integrated strategy of clean and efficient energy storage technology. The most feasible concept is rechargeable battery technology, the most Advanced is lithium-ion battery technology. Lithium-ion batteries not only occupy a dominant position in the small-size battery market for portable electronic products, but also are successfully applied to mobile electric storage and storage system storage. At present, lithium-ion batteries are a further improvement to the operating performance, such as specific energy (Wh kg -1 ) and volumetric energy density (Wh L -1 ), so as to achieve the purpose of small size, l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/021C01B33/32H01M4/38H01M4/62H01M10/0525
CPCC01B33/021C01B33/32C01P2004/80C01P2006/40H01M4/386H01M4/62H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 赵岸光岳风树姚钧
Owner JIANGXI IAMETAL NEW ENERGY TECH CO LTD
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