Preparation method of silicon-based composite negative electrode material of lithium battery

A technology of negative electrode material and lithium battery, which is applied in the field of preparation of silicon-based composite negative electrode material for lithium battery, can solve the problems of poor cycle performance and low Coulomb efficiency in the first cycle, and achieve suitable mass production, improve rate performance, and improve cycle. performance effect

Active Publication Date: 2019-12-27
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of low first cycle coulombic efficiency and poor cycle performance of existing silicon-based composite materials, and provide a preparation method of silicon-based composite negative electrode materials for lithium batteries, so as to improve the cycle life of current lithium-ion battery negative electrode materials and energy density

Method used

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  • Preparation method of silicon-based composite negative electrode material of lithium battery
  • Preparation method of silicon-based composite negative electrode material of lithium battery
  • Preparation method of silicon-based composite negative electrode material of lithium battery

Examples

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Embodiment 1

[0047] (1) Mix 3Kg Si powder with 6Kg SiO 2 Put the powder into a high-speed mixer, stir and mix at 1000r / min for 30min under the protection of an inert atmosphere and cooling with circulating water to obtain a uniformly mixed raw material A, and then keep the raw material A at 50°C for 2 hours under the protection of argon to fully remove moisture; At the same time, 0.5Kg metal magnesium powder and 0.5kg magnesium aluminum alloy (wherein the magnesium content is 36.2wt%) are kept at 50° C. for 2 hours under the protection of argon to fully remove moisture, and the raw material B is obtained.

[0048] (2) Put the above dried raw material A into the heating chamber 1 of the vacuum furnace with a condensation collection system, pump the vacuum to below 1Pa and start heating, heat to 1300°C and keep it for 20h, and then lower the temperature at a rate of 50°C / h Cool down to 1100°C and keep it warm for 10 hours; at the same time, add the dried raw material B into the heating chamb...

Embodiment 2

[0051] Operate according to the same method as in Example 1, except that the raw material B in step (1) is 0.6Kg metal magnesium powder and 0.4kg magnesium-aluminum alloy.

Embodiment 3

[0053] Operate in the same manner as in Example 1, except that the raw material B in step (1) is 0.8Kg metal magnesium powder and 0.2kg magnesium-aluminum alloy.

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Abstract

The invention provides a preparation method of a silicon-based composite negative electrode material of a lithium battery, which comprises the following steps: forming steam from a Si-containing raw material A and a reducing substance raw material B capable of reacting to generate silicate under a vacuum heating condition, condensing and depositing the reactants in a deposition system after reaction, and carrying out carbon coating to obtain a silicon-based composite material. In the invention, it is unexpectedly found that when a certain amount of alloy is added into the raw material B, the proportion of a crystal region in the silicon-based composite material can be reduced, and the initial coulombic efficiency and the cycling stability of the negative electrode material are further improved. The preparation method also has the advantages of simple process, cheap and easily available raw materials, suitability for large-scale production, high practical degree and the like.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a preparation method of a silicon-based composite negative electrode material for a lithium battery. Background technique: [0002] With the rapid development of portable electronic products, electric vehicles, and energy storage power stations, people have higher and higher requirements for performance indicators such as energy density, power density, and cycle life of energy storage devices. Due to the advantages of high specific capacity, high energy density and power density, no self-discharge, and environmental protection, lithium-ion batteries have been widely used in consumer electronics, power tools, medical electronics and other fields. However, the anode materials in commercial lithium-ion batteries are mainly low-capacity graphite materials, and their theoretical capacity is only 372mAh / g, which limits the application of lithium-ion batteries in electric ...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B33/113C01B33/20H01M4/48H01M4/62H01M10/052
CPCC01B33/113C01B33/20C01B32/05H01M4/483H01M4/625H01M10/052C01P2002/72C01P2004/04C01P2004/03C01P2006/40Y02E60/10H01M4/36H01M4/386H01M4/366H01M4/48H01M4/134H01M4/1395H01M4/364H01M4/5825H01M4/1391H01M2004/021H01M4/485H01M2004/027H01M4/0471C01P2002/74
Inventor 郭玉国黄林波徐泉殷雅侠岳风树姚钧赵岸光
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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