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Multi-component composite anode material and preparation method thereof

A negative electrode material and multi-component composite technology, which is applied in the field of multi-component composite negative electrode materials and their preparation, to achieve the effect of excellent electrochemical characteristics

Inactive Publication Date: 2014-02-05
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-component composite negative electrode material and a preparation method thereof, and to prepare a multiple-component composite negative electrode material for the problems of easy pulverization and low conductivity of the silicon material itself, so as to improve the above-mentioned problems of silicon; Among them, nano-silicon powder is the core active substance, which plays the role of energy storage; carbon nanotubes play the role of electricity; expanded graphite plays a dual role, including the volume rigid buffer space and the role of conductive agent in the charging and discharging process of silicon powder; Amorphous carbon as a more flexible buffer space

Method used

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  • Multi-component composite anode material and preparation method thereof

Examples

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Embodiment 1

[0017] like figure 1 Dissolve polyvinyl alcohol with a degree of polymerization of 170 in deionized water to form an organic PVA solution with a concentration of 0.08; then silicon powder with a particle size of 35nm (accounting for 21% of the total weight of the composite material), a pipe diameter of 40nm and an electrical conductivity Carbon nanotubes with a size of 119 s / cm (accounting for 5% of the total weight of the composite material) and expanded graphite with a size of 10 microns (accounting for 19% of the total weight of the composite material) were added to the above-mentioned organic solution, at 80 o Stir vigorously at C until all the water is volatilized to form a precursor powder; the precursor powder is placed in a tube furnace protected by argon for sintering, and the heating rate is 5 o C / min, the sintering time is 10h, and the sintering temperature is 650 o C, after cooling at room temperature, a multi-component composite negative electrode material contai...

Embodiment 2

[0019] Dissolve polyvinyl alcohol with a degree of polymerization of 1900 in deionized water to form an organic PVA solution with a concentration of 0.2; then silicon powder with a particle size of 20nm (accounting for 30% of the total weight of the composite material), a pipe diameter of 50nm and an electrical conductivity Carbon nanotubes with a diameter of 200 s / cm (accounting for 7% of the total weight of the composite material) and expanded graphite with a size of 20 microns (accounting for 26% of the total weight of the composite material) were added to the above-mentioned organic solution respectively, at 90 o Stir vigorously at C until all the water is volatilized to form a precursor powder; the precursor powder is placed in a tube furnace with nitrogen protection for sintering, and the heating rate is 8 o C / min, the sintering time is 10h, and the sintering temperature is 750 o C, After cooling at room temperature, a multi-component composite negative electrode materia...

Embodiment 3

[0021] figure 2 As shown, polyethylene glycol with a molecular weight of 5000 was dissolved in deionized water to form an organic solution with a concentration of 0.4; then silicon powder with a particle size of 200nm (accounting for 28% of the total weight of the composite material) with a diameter of 45nm and an electrical conductivity Carbon nanotubes with a rate of 320 s / cm (accounting for 3% of the total weight of the composite material) and expanded graphite with a size of 0.5 microns (accounting for 30% of the total weight of the composite material) were added to the above organic solution respectively, at 80 o Stir vigorously at C until all the water is volatilized to form a precursor powder; the precursor powder is placed in a vacuum furnace for sintering, and the heating rate is 6 o C / min, the sintering time is 6h, and the sintering temperature is 700 o C, After cooling at room temperature, a multi-component composite negative electrode material containing 39% amor...

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Abstract

The invention relates to a multi-component composite anode material and a preparation method thereof. The multi-component composite anode material is characterized by comprising the following components in mass fraction: 15 to 30% of nano silicon powder, 5 to 9% of carbon nano tube, 19 to 40% of expanded graphite, and 37 to 55% of amorphous carbon. The multi-component composite anode material is prepared by carbonizing polyving akohol or polyethylene glycol at high temperature. The nano silicon powder serving as a core active material is used for storing energy; the carbon nano tube is used for conducting electricity; the expanded graphite is dual-functional, including effects of serving as a massive and rigid buffer space and a conductive additive during charging and discharging through silica powder; the amorphous carbon is prepared by carbonizing polyving akohol or polyethylene glycol at high temperature and can be used as a flexible buffer space. The composite material is outstanding in electrochemical properties.

Description

technical field [0001] The invention relates to a multi-component composite negative electrode material and a preparation method thereof, belonging to the technical field of energy storage materials. Background technique [0002] Lithium-ion battery, a device for energy storage and conversion, has become more and more accepted by people with the advancement of science and technology and the development of the times, and its application fields have become more and more extensive, including portable electronic products, mobile phones, electric vehicles, storage Can and other fields. The negative electrode material is an important part of the battery. Together with the positive electrode material, it determines the key performance of the battery such as cycle life, capacity and safety. Most of the traditional negative electrode materials are carbon-based materials, such as artificial graphite, natural graphite, hard carbon, etc. The discharge capacity of this type of material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38
CPCH01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 姜涛陈慧明王丹张克金
Owner CHINA FIRST AUTOMOBILE
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