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Lithium ion battery cathode material compounded with graphene and preparation method thereof

A negative electrode material and ion battery technology, applied in the field of graphene composite lithium ion battery negative electrode material and its preparation, can solve the problems of volume change electrode pulverization, low capacity, etc., achieve easy operation, simple preparation process, increase energy density and The effect of cycle performance

Active Publication Date: 2013-04-17
深圳石墨烯创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that, in view of the defect that the lithium battery negative electrode material using graphite in the prior art has a low capacity, and when metal oxide is used as the negative electrode material, the large volume change in the charging and discharging process causes the electrode powdering defect, providing A graphene composite lithium-ion battery anode material with good conductivity, large electrochemical lithium storage capacity, high energy density, and good cycle performance

Method used

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  • Lithium ion battery cathode material compounded with graphene and preparation method thereof
  • Lithium ion battery cathode material compounded with graphene and preparation method thereof

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Embodiment 1

[0031] Such as figure 2 Shown, a kind of composite lithium ion battery negative electrode material, this material comprises multi-layer graphene sheet layer 1, is provided with hollow nanometer negative electrode particle layer 2 between adjacent graphene sheet layer 1, the whole composite lithium ion battery negative electrode The material is a sandwich lamellar structure. The graphene sheet 1 separates the hollow nano-anode particles 20 in the hollow nano-anode particle layer 2 one by one and a half, leaving a gap between the adjacent graphene sheets 1; the hollow nanometer The negative electrode particle 20 is a two-layer hollow structure composed of a carbon outer layer 21 and a hollow metal negative electrode material inner layer 22 .

[0032]In the anode material of the present invention, the hollow nano-anode particle layer 2 is composed of a large number of hollow nano-anode particles 20, and these hollow nano-anode particles 20 are tiled to form a hollow nano-anode ...

Embodiment 2

[0039] A preparation method of composite lithium ion battery negative electrode material, comprising the following steps:

[0040] (1) Mix and react the organic precursor of raw material silica, cationic surfactant, tin salt solution, and organic carbon source; then add graphene oxide or graphene dispersion to continue the reaction; finally dry to obtain the intermediate product; The parts by weight of raw materials are: organic precursor of silicon dioxide 1-20, cationic surfactant 2-10, tin salt 5-50, organic carbon source 5-50, graphene oxide or graphene 1-10;

[0041] (2) The intermediate product is treated with a treatment liquid, and then washed and dried to obtain the primary product; the primary product is heat-treated in an environment with an oxidizing gas content of less than 0.01%, to obtain a negative electrode material for a composite lithium-ion battery.

[0042] In the preparation method of the negative electrode material of the composite lithium ion battery, t...

Embodiment 2-1

[0053] A preparation method of composite lithium ion battery negative electrode material, comprising the following steps:

[0054] (1) Add 30ml of absolute ethanol and 120ml of deionized water into a beaker as a solvent, stir evenly, add 10ml of concentrated ammonia water and 2.4g of cetyltrimethylammonium bromide, and then add 1ml of ethyl orthosilicate Carefully add it dropwise into the beaker, then add 5g of tin protochloride into the beaker, stir evenly to make it all dissolve. Stir mechanically at room temperature for 12 hours, then add 5 g of glucose, continue stirring for 12 hours, and add the reaction solution dropwise to 200 ml of graphene oxide solution with a concentration of 2 mg / ml ultrasonic dispersion, stir for 12 hours, and evaporate to dryness in a water bath at 80 ° C to obtain intermediate product.

[0055] (2) The intermediate product was soaked in HF solution with a concentration of 10% by mass for 60 minutes. After soaking, it was washed with deionized w...

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Abstract

The invention discloses a lithium ion battery cathode material compounded with graphene and a preparation method thereof. The cathode material comprises multiple layers of graphene sheets, a hollow nano cathode granular layer is arranged between adjacent grapheme sheets so as to be respectively separated through half surrounding, and a clearance is reserved between adjacent graphene sheets; and the hollow nano cathode granule consists of a carbon outer layer and a hollow metal cathode material inner layer. The preparation method comprises the following steps of: mixing the organic presoma of silica, cationic surface active agent, tin salt solution, and organic carbon source for reaction, adding oxidized graphene or dispersion liquid of the graphene for reacting and drying so as to obtain intermediate products, obtaining head products through treatment of the treating liquid, and obtaining the product through heat treatment of the head products. The cathode material has good conductivity, and is large in electrochemical lithium storage volume, high in energy density, and good in circulation. The preparation method is easy for realization of industrialization and is low in cost.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and relates to a nanostructured graphene composite lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Due to its high energy density and good cycle performance, lithium-ion batteries have been widely used and gradually replaced traditional chemical power sources such as lead-acid batteries in many fields. Especially with the increasingly prominent energy and environmental issues, the new energy industry has received more and more attention. The hybrid electric vehicle and electric vehicle industries are developing rapidly, and lithium-ion batteries are widely used as an important energy storage device. [0003] Lithium-ion battery anode material is an important part of the battery, its structure and performance directly affect the capacity and cycle performance of lithium-ion batteries. A...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139B82Y30/00
CPCY02E60/10
Inventor 杨全红郑晓雨游从辉李宝华张辰苏方远吕伟魏伟陶莹康飞宇
Owner 深圳石墨烯创新中心有限公司
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