Carbon-carbon multi-component negative electrode material and preparation method thereof

A negative electrode material and multi-component composite technology, which is applied in the field of negative electrode materials for lithium ion batteries and their preparation, can solve the problems of low capacity, mechanical pulverization, poor cycle performance, etc. poor rate effect

Active Publication Date: 2014-09-10
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Due to the low conductivity of silicon materials and the severe volume expansion and contraction during lithium ion intercalation and deintercalation cycles, it is easy to cause damage to the material structure and mechanical crushing, which leads to the decline of electrode cycle performance and limits its commercial use. application
In order to solve these pro

Method used

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  • Carbon-carbon multi-component negative electrode material and preparation method thereof
  • Carbon-carbon multi-component negative electrode material and preparation method thereof
  • Carbon-carbon multi-component negative electrode material and preparation method thereof

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specific Embodiment approach

[0030] The preferred embodiment of the present invention is as follows:

[0031] A silicon-carbon multi-component composite negative electrode material, which is mainly composed of flexible graphite, nano-silicon and amorphous carbon, wherein the mass fractions of flexible graphite, nano-silicon and amorphous carbon in the silicon-carbon multiple-component composite negative electrode material are respectively It is: 30%-60%, 30%-50% and 10%-30%; and the amorphous carbon is mainly obtained after high-temperature pyrolysis of the organic carbon source, and the flexible graphite is mainly obtained by applying pressure to the expanded graphite; its preparation The method includes the following steps:

[0032] (1) Preparation of expanded graphite: first, potassium dichromate is dissolved in concentrated sulfuric acid with a mass fraction ≥ 98%, the mass ratio of potassium dichromate to concentrated sulfuric acid is controlled to be 1:5 to 1:27, and in a beaker Stir continuously; ...

Embodiment 1

[0038] A silicon-carbon multi-component composite negative electrode material, which is mainly composed of flexible graphite, nano-silicon and amorphous carbon, wherein the mass fractions of flexible graphite, nano-silicon and amorphous carbon in the silicon-carbon multiple-component composite negative electrode material are respectively They are: 40%, 30% and 30%; and the amorphous carbon is mainly obtained after high-temperature pyrolysis of an organic carbon source, and the flexible graphite is mainly obtained by applying pressure to expanded graphite.

[0039] The preparation method of the silicon-carbon multi-component composite negative electrode material in this embodiment specifically includes the following steps:

[0040] (1) The preparation of expanded graphite: at first potassium dichromate is dissolved in the concentrated sulfuric acid of 98% by mass fraction, the mass ratio of potassium dichromate and the concentrated sulfuric acid is controlled as 1: 5, and consta...

Embodiment 2

[0047] A silicon-carbon multi-component composite negative electrode material, which is mainly composed of flexible graphite, nano-silicon and amorphous carbon, wherein the mass fractions of flexible graphite, nano-silicon and amorphous carbon in the silicon-carbon multiple-component composite negative electrode material are respectively They are: 30%, 50% and 20%; and the amorphous carbon is mainly obtained after high-temperature pyrolysis of the organic carbon source, and the flexible graphite is mainly obtained by applying pressure to expanded graphite.

[0048] The preparation method of the silicon-carbon multi-component composite negative electrode material in this embodiment specifically includes the following steps:

[0049] (1) The preparation of expanded graphite: at first potassium dichromate is dissolved in the concentrated sulfuric acid that mass fraction is 98%, the mass ratio control of potassium dichromate and the concentrated sulfuric acid is 1: 27, and constant...

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Abstract

The invention relates to a carbon-carbon multi-component negative electrode material. The carbon-carbon multi-component negative electrode material is mainly composed of flexible graphite, nanometer silicon and amorphous carbon which respectively account for 30-60%, 30-50% and 10-30% based on mass percent, the amorphous carbon is obtained through high-temperature pyrolyzation of an organic carbon source, and the flexible graphite is obtained by applying pressure to expanded graphite. A preparation method of the product comprises the steps of: firstly, preparing an expanded graphite/silicon-silicon dioxide/carbon composite negative electrode material through high-temperature pyrolyzation; secondly, pouring the expanded graphite/silicon-silicon dioxide/carbon composite negative electrode material into a mould and applying pressure to obtain a flexible graphite/silicon-silicon dioxide/carbon composite negative electrode material; thirdly, processing silicon dioxide to obtain a flexible graphite/silicon/carbon composite negative electrode material through etching by a corrosive liquid; and finally, using asphalt to permeate a gap inside the flexible graphite/silicon/carbon composite negative electrode material in a protective atmosphere, and obtaining the product after high-temperature heat treatment and repetition. The carbon-carbon multi-component negative electrode material has the advantages of high capacity, high coulombic efficiency, good cycle performance, structure stability, high reversible capacity and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials and preparation thereof, and in particular relates to a negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in various portable electronic devices and electric vehicles due to their advantages such as large specific energy, high working voltage, low self-discharge rate, small size, and light weight. The current commercial lithium-ion battery anode material is mainly graphite, but its theoretical capacity is only 372mAh g -1 , can no longer meet the demand for high energy density power supplies in the application field of lithium-ion batteries. Therefore, there is an urgent need to develop a new type of anode material for lithium-ion batteries with high specific capacity. [0003] As an anode material for lithium-ion rechargeable batteries, silicon materials have been rece...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/587H01M4/62
CPCH01M4/362H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 郭华军孟奎李新海王志兴周玉彭文杰胡启阳苏明如杨阳
Owner CENT SOUTH UNIV
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