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

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low initial Coulomb efficiency, low bulk conductivity, and poor rate performance, so as to improve cycle performance and improve Rate performance, the effect of enhanced activity

Active Publication Date: 2021-10-15
BEIJING IAMETAL NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problems of the existing silicon-based materials such as low bulk phase conductivity, irreversible phase formation during the first charge and discharge, poor rate performance caused by silicon crystal region agglomeration during the cycle, low initial Coulombic efficiency, and low cycle life. A lithium-ion battery silicon-based composite negative electrode material and its preparation method are developed to improve the cycle and rate performance of current lithium-ion battery negative electrode materials

Method used

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

Examples

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Embodiment 1

[0099](1) Pretreatment: 0.8 kg of silicon powder with a particle size of 100 µm and 1.2 kg of silicon dioxide powder with a particle size of 100 µm were added to the mixer, and mixed at a speed of 600 r / min for 15 min to get uniformly mixed raw material A, and take 200 g of Sn powder with a particle size of 70 μm as raw material B. Raw material A and raw material B were dried under an argon atmosphere at 80 °C for 6 h to remove moisture to obtain pretreated raw materials.

[0100] (2) Sn element-doped silicon-based composite material: put the raw materials obtained in step (1) into a vacuum furnace with a collection device and two heating chambers, raw material A is put into heating chamber 1, and raw material B is put into heating chamber 2 After pumping the pressure below 10 Pa, heating was started. Heating chamber 1 was heated to 1400°C at a rate of 6°C / min and then kept for 10 hours. Heating chamber 2 was raised to 1083°C with the same heating time and kept for 10 hours. ...

Embodiment 2

[0103] Operate in the same manner as in Example 1, the only difference is that in step (2) the vacuum furnace is not sintered after the heat preservation, and naturally cooled to room temperature to obtain a block-shaped Sn-doped silicon-based composite negative electrode material, and finally carbon-coated Sn Doped silicon-based composite anode material. The doping element Sn accounts for about 8% of the silicon-based composite anode material.

Embodiment 3

[0105] The operation was carried out in the same manner as in Example 1, except that the temperature of the collection device was controlled at 200° C. in step (2).

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Abstract

The invention provides a lithium ion battery silicon-based composite negative electrode material and a preparation method thereof. The silicon-based composite negative electrode material is composed of silicon, silicon oxide, doped metal and a carbon material, the silicon and the doped metal are dispersed in a substrate formed by the silicon oxide, the surface of material particles is evenly coated with the carbon material, and the negative electrode material is in-situ nanoscale bulk phase doped metal; the doped metal is selected from one or more of fourth and fifth period transition metal elements and / or fourth and fifth main group metal elements; and the total mass of the silicon-based composite negative electrode material is 100%, the mass ratio of the doped metal is 3-12%, and the mass ratio of the carbon material is 1-10%. The metal is doped in the silicon monoxide, a part of lithium in the buffer layer is released through a reverse conversion reaction, agglomeration and growth of a silicon crystal region in a circulation process are inhibited, and the first coulombic efficiency, the multiplying power and the circulation performance of the negative electrode material are improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a silicon-based composite negative electrode material for a lithium-ion battery and a preparation method thereof. Background technique [0002] With the continuous development of human society and the continuous consumption of non-renewable resources such as coal and oil, the future development of human society is facing the risk of energy shortage. The use of fossil energy has also brought serious environmental pollution problems. The development of green, safe and sustainable new energy technologies is one of the ways to solve energy and environmental problems. Among many new energy technologies, lithium-ion batteries play an important role in energy storage technology because of their high energy density, long service life, fast charging and discharging speed, and good safety. [0003] One of the development directions of lithium-ion batteries is higher energy ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525C01B33/18C01B32/05
CPCH01M4/366H01M4/386H01M4/483H01M4/625H01M4/626H01M4/628H01M10/0525C01B33/18C01B33/182C01B33/181C01B32/05C01P2004/80C01P2002/72C01P2004/03C01P2004/04C01P2004/61C01P2006/11H01M2004/021H01M2004/027Y02E60/10
Inventor 贺翔许迪新李阁程晓彦岳风树
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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