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Lithium ion battery composite anode material and preparation thereof

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., to achieve the effect of high capacity, good stability and convenient operation

Active Publication Date: 2013-12-04
北京赛德美资源再利用研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the shortcomings of silicon materials, a large number of modification researches have been carried out. The most commonly used improvement methods have greatly improved silicon as a negative electrode material, but have not fundamentally overcome its fatal volume expansion.

Method used

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  • Lithium ion battery composite anode material and preparation thereof
  • Lithium ion battery composite anode material and preparation thereof
  • Lithium ion battery composite anode material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Mix nano-silicon with a particle size of 50nm, lithium hydride of 25nm and carbon nanotubes of 100nm at a ratio of 40%, 10%, and 50% and ball mill at 500r / min for 48 hours, and add 0.5% of silane coupling agent. The content of the mixed matrix powder is 10% % phenolic resin alcohol solution after stirring, volatilize the solvent, conduct heat treatment at 300°C for 1 hour, pulverize, sieve and add to the phenolic resin alcohol solution containing 0.5% silane coupling agent whose content is 5% of the mass of the mixed matrix powder and stir The solvent was evaporated, dried at 80°C, and then heated at 5°C / min to 600°C for 2 hours, then naturally cooled to room temperature to obtain a lithium-ion battery composite negative electrode material.

Embodiment 2

[0023] Example 2 The particle size is 70nm nano-silicon, 25nm lithium hydride and 100nm carbon nanotubes are mixed according to the ratio of 65%, 15%, 20% and ball milled at 1000r / min for 24h, and the content of 0.6% carboxymethyl cellulose is added to the mixed matrix powder mass 20 % of kerosene asphalt carbon disulfide solution after stirring, volatilize the solvent, heat treatment at 350°C for 1 hour, pulverize, and add to the carbon disulfide solution of kerosene asphalt containing 0.6% carboxymethyl cellulose with a content of 5% of the mass of the mixed matrix powder after sieving After stirring, the solvent was evaporated, dried at 80°C, heated at 5°C / min to 700°C for 2 hours, and cooled naturally to room temperature to obtain a lithium-ion battery composite negative electrode material.

Embodiment 3

[0024] Example 3 Mix nano-silicon with a particle size of 60nm, 25nm lithium hydride and 500nm natural flake graphite at a ratio of 60%, 20%, and 20% and ball mill at 2000r / min for 6h, and add 0.7% titanate coupling agent to the mass of the mixed matrix powder Stir in 5% polyvinyl chloride alcohol solution to volatilize the solvent, heat-treat at 385°C for 1 hour, pulverize, and add to polyvinyl chloride containing 0.7% titanate coupling agent and the content is 5% of the mixed matrix powder mass after sieving After stirring in the alcohol solution, the solvent was evaporated, dried at 80°C and then heated to 800°C at 5°C / min for 2 hours, and cooled naturally to room temperature to obtain a lithium-ion battery composite negative electrode material.

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Abstract

The invention relates to a lithium ion battery composite anode material and a preparation thereof. The lithium ion battery composite anode material comprises a base and a carbon-containing layer formed on the surface of the base; the base comprises nanometer silicon, a lithium-containing compound and a carbon micro powder mixture; the carbon-containing layer is an amorphous carbon layer covering on the surface of the base particles and playing the role of connecting different base compositions. The preparation method of the lithium ion battery composite anode material is characterized by comprising: blending nanometer silicon, lithium hydride, carbon micro powder, an organic carbon source precursor, a surfactant and the like, performing low-temperature setting and then crushing, and performing high-temperature carbonization treatment under an oxygen isolation condition. The preparation method is simple in technology and low in cost, and the prepared composite material has high capacity, good cycle performance and a wide application prospect.

Description

technical field [0001] The invention relates to a lithium ion battery composite negative electrode material and a preparation method thereof. It belongs to the technical field of lithium ion batteries. Background technique [0002] At present, the negative electrode material of commercial lithium-ion batteries uses graphite-based carbon materials, but its theoretical capacity is only 372mAh / g, which limits the further improvement of the specific energy of lithium-ion batteries, and the low charge and discharge capacity of carbon materials limits the ability of lithium-ion batteries. The development of power batteries. [0003] In order to overcome the current difficulties of carbon materials, there have been many modification studies: on the one hand, through various physical and chemical means, and on the other hand, the research focuses on finding new negative electrode material systems, such as various alloys and their oxides. This type of new negative electrode materia...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/38
CPCY02E60/122Y02E60/10
Inventor 周宏明李艳芬李荐朱玉华
Owner 北京赛德美资源再利用研究院有限公司
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