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A kind of preparation method for lithium-ion battery silicon carbon negative electrode material

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost, complex method and process, toxic and harmful, and achieve the effect of simple method and enhanced cycle stability.

Active Publication Date: 2020-08-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method reported in the above literature is complicated
Raw materials used are expensive or toxic

Method used

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  • A kind of preparation method for lithium-ion battery silicon carbon negative electrode material
  • A kind of preparation method for lithium-ion battery silicon carbon negative electrode material
  • A kind of preparation method for lithium-ion battery silicon carbon negative electrode material

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Embodiment 1

[0021] 1) Mix microcrystalline cellulose, sodium hydroxide, urea and water in a mass ratio of 4:6:10:80, and stir at -10°C to dissolve the cellulose.

[0022] 2) Add elemental silicon to the mixed solution obtained in step 1) and shake evenly. The mass ratio of cellulose to elemental silicon in the obtained mixed solution is 1:1.

[0023] 3) Pour the washing obtained in step 2) into an aqueous hydrochloric acid solution to regenerate the cellulose. The regenerated cellulose-silicon composite material is calcined and carbonized at 700°C in a high-temperature inert environment after being filtered, washed and dried. Electron microscope analysis pictures before and after roasting, see Figure 1~4 . Depend on figure 1 with 2 Visible, cellulose particles (cellulose) and silicon nanoparticles (Si NPs); by image 3 with 4 Visible, silicon nanoparticles (Si NPs) and carbon particles (carbon).

Embodiment 2

[0025] 1) Mix microcrystalline cellulose, lithium hydroxide, urea and water in a mass ratio of 4:6:10:80, and stir at -10°C to dissolve the cellulose.

[0026] 2) Add elemental silicon to the mixed solution obtained in step 1) and shake evenly. The mass ratio of cellulose to elemental silicon in the obtained mixed solution is 0.5:1.

[0027] 3) Pour the washing obtained in step 2) into aqueous acetic acid to regenerate the cellulose. The regenerated cellulose-silicon composite material is calcined and carbonized at 800°C in a high-temperature inert environment after being filtered, washed and dried.

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Abstract

A preparation method of a silicon carbon negative electrode material for a lithium ion battery relates to a lithium ion battery negative electrode material. The preparation method comprises the stepsof dissolving a cellulose raw material with an alkali urea solution to obtain a homogeneous solution; adding the obtained homogeneous solution into an elemental silicon material for mixing to obtain acellulose-silicon powder mixed solution, and performing reproduction to obtain a cellulose-elemental silicon composite material; and roasting and carbonizing the cellulose-elemental silicon compositematerial to obtain the silicon carbon negative electrode material for the lithium ion battery. The cellulose raw material which can be reproduced and is low in cost is employed, a silicon dioxide layer can be simultaneously generated during the preparation process, so that the electrode material forms a multi-layer structure, and the cycle stability of the electrode material is further improved.The method has the advantages of simplicity, no toxicity and no pollution and is suitable for industrial production on a large scale.

Description

technical field [0001] The invention relates to lithium ion battery negative electrode materials, in particular to a preparation method for lithium ion battery silicon carbon negative electrode materials. Background technique [0002] As a new generation of secondary batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge rate and no memory effect. Therefore, in the past few years, it has been widely used in electric vehicles, energy storage devices, consumer electronics, power tools and other fields. As we all know, traditional commercial lithium batteries currently mainly use graphite as the negative electrode material of the battery. Its theoretical specific capacity is only 372mAh g -1 . It cannot meet the application requirements of current high energy density storage devices. Among the many anode materials for lithium-ion batteries, silicon (Si) is considered to be one of the most potential anode materials wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 刘健申大志龙敏南甘礼惠
Owner XIAMEN UNIV