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Preparation method for graphite and silicon composite anode material

A technology of silicon composite material and negative electrode material, applied in the field of materials, can solve the problems of increased risk, difficulty in operation, cumbersome process, etc., and achieve the effects of low cost, simple process, and easy availability of raw materials

Inactive Publication Date: 2016-10-12
苏州微格纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is cumbersome and requires repeated high-temperature heating, up to 1000°C, and strong acid and strong alkali are used for corrosion in the process, which also increases the danger of preparation and the difficulty of operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 1g of nano-silicon (D50:30nm) and 20g of expanded graphite (150 mesh, purity of 99.9%, expansion degree of 300mL / g), add 1g of nano-silicon to 500mL of ethanol and fully disperse to obtain nano-silicon organic Dispersions. Then add the expanded graphite into the organic dispersion of nano-silicon and stir the expanded graphite to fully absorb the solution. Then, the saturated expanded graphite was fished out, and dried at 60° C. under vacuum condition, so as to obtain the expanded graphite-silicon composite material. Finally, the obtained expanded graphite-silicon composite material is rolled by a pair of rollers to finally obtain a graphite-silicon composite negative electrode material.

Embodiment 2

[0030] Weigh 0.5g of nano-silicon (D50:30nm) and 20g of expanded graphite (200 mesh, purity of 99.9%, expansion degree of 200mL / g), add 0.5g of nano-silicon to 500mL of toluene and fully disperse to obtain nano-silicon of organic dispersions. Then add the expanded graphite into the organic dispersion of nano-silicon and stir the expanded graphite to fully absorb the solution. Then, the saturated expanded graphite is fished out, and dried at 100° C. under vacuum condition, so as to obtain the expanded graphite-silicon composite material. Finally, the obtained expanded graphite-silicon composite material is rolled by a pair of rollers to finally obtain a graphite-silicon composite negative electrode material.

Embodiment 3

[0032] Weigh 0.2g of nano-silicon (D50:30nm) and 20g of expanded graphite (300 mesh, purity of 99.9%, expansion of 150mL / g), add 0.2g of nano-silicon to 500mL of acetone and fully disperse to obtain nano-silicon of organic dispersions. Then add the expanded graphite into the organic dispersion of nano-silicon and stir the expanded graphite to fully absorb the solution. Then, the saturated expanded graphite was fished out, and dried at 150° C. under vacuum condition, so as to obtain the expanded graphite-silicon composite material. Finally, the obtained expanded graphite-silicon composite material is rolled by a pair of rollers to finally obtain a graphite-silicon composite negative electrode material.

[0033] The electrochemical performance test results of each lithium-ion battery prepared above are shown in Table 1:

[0034] Table 1 Electrochemical performance test table of lithium ion battery

[0035]

[0036] Compared with the technical scheme of the prior art...

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Abstract

The invention provides a preparation method for a graphite and silicon composite anode material. The graphite and silicon composite anode material is obtained by taking expanded graphite as a raw material, adsorbing an organic dispersion liquid of nano silicon, then, performing heat treatment to obtain an expanded graphite silicon composite material, and flattening the expanded graphite silicon composite material. The graphite and silicon composite anode material has the characteristics of high effectiveness, long cycle life and high capacity; moreover, the method is simple in process; the raw materials are easily obtained; the used organic dispersion liquid can be recycled and is green and environment-friendly; industrial production is facilitated.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for preparing a graphite-silicon composite negative electrode material. Background technique [0002] Lithium-ion batteries have many advantages such as high voltage, high energy, long cycle life, and no memory effect. They have been widely used in consumer electronics, power tools, medical electronics, and energy storage. In the structure of the battery, the negative electrode material is one of the key factors affecting its performance. At present, the commonly used negative electrode materials mainly include graphite, carbon, and lithium titanate. The specific capacity of graphite and carbon negative electrode materials is generally in the range of 300-400mAh / g, while the specific capacity of lithium titanate is only 170mAh / g and the voltage platform is too high (1.5V vs Li+ / Li). This greatly affects the energy density of the battery, thereby affecting the miniatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/38H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/1393H01M4/1395H01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 马元王晓永
Owner 苏州微格纳米科技有限公司
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