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A kind of lithium-ion battery silicon-based composite negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, silicon compounds, etc., can solve the problems of low first coulombic efficiency, low bulk conductivity, and low cycle life, and achieve improved cycle performance and increased rate. performance, the effect of reducing exposure

Active Publication Date: 2022-05-17
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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  • A kind of lithium-ion battery silicon-based composite negative electrode material and preparation method thereof
  • A kind of lithium-ion battery silicon-based composite negative electrode material and preparation method thereof
  • A kind of lithium-ion battery silicon-based composite negative electrode material and preparation method thereof

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Effect test

Embodiment 1

[0099](1) Pretreatment: Take 0.8 kg of silicon powder with a particle size of 100 μm and 1.2 kg of silica powder with a particle size of 100 μm and add it to the mixer, and mix it at a speed of 600 r / min for 15 min under the condition of circulating water cooling to obtain a homogeneous raw material A, and take Sn powder with a particle size of 70 μm and 200 g as raw material B. Raw material A and raw material B were dried at 80 °C under argon atmosphere for 6 h to remove moisture, and the pretreated raw material was obtained.

[0100] (2) Sn element doped silicon matrix composite material: the raw material obtained in step (1) is loaded into a vacuum furnace with a collection device and two heating chambers, raw material A is loaded into the heating chamber 1, raw material B is loaded into the heating chamber 2, the pressure is pumped to 10 Pa or less and then heating begins, the heating chamber 1 is heated at a rate of 6 °C / min to 1400 °C after heating for 10 h, the heating cha...

Embodiment 2

[0103] Operated in accordance with the same method in Example 1, the difference is only that in step (2) after the vacuum furnace insulation ends without sintering, natural cooling to room temperature to obtain a bulkYn-doped silicon-based composite anode material, and finally to obtain a carbon-coated Sn-doped silicon-based composite anode material. The doped element Sn accounts for about 8% of the silicon-based composite anode material.

Embodiment 3

[0105] Operate in accordance with the same method as Example 1, the difference is only that step (2) controls the temperature of the collection device at 200 °C.

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Abstract

The invention provides a silicon-based composite negative electrode material for a lithium ion battery and a preparation method thereof. The silicon-based composite negative electrode material is composed of silicon, silicon oxide, doped metal and carbon material, wherein silicon and doped metal are dispersed in silicon In the substrate formed by oxides, the carbon material is evenly coated on the surface of the material particles, and the negative electrode material is an in-situ nanoscale bulk phase doped metal; the doping metal is selected from the fourth and fifth period transition metal elements and / or the first One or more of the four or five main group metal elements; the total mass of the silicon-based composite negative electrode material is calculated as 100%, the mass of the doped metal accounts for 3-12%, and the mass of the carbon material accounts for 1-10% . Doping metal in silicon oxide can release a part of lithium in the buffer layer through the reverse conversion reaction, and inhibit the agglomeration and growth of the silicon crystal region during the cycle, and improve the first Coulombic efficiency, rate and cycle performance of the negative electrode material.

Description

Technical field [0001] The present invention belongs to the field of battery technology, specifically relates to a lithium-ion battery silicon-based composite anode material and a preparation method thereof. Background [0002] With the continuous development of human society and the continuous consumption of non-renewable resources such as coal and petroleum, the future development of human society is facing the risk of energy shortage. The use of fossil energy also brings 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 occupy an important position 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 density, and the developme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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