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Preparation method and application of bicontinuous-structural nanocomposite material

A nanocomposite, bicontinuous technology, applied in structural parts, active material electrodes, electrical components, etc., can solve the problems of low electronic conductivity, poor rate performance, and poor cycle performance of silicon materials, and achieve high specific capacity, The effect of good cycle performance

Inactive Publication Date: 2015-10-14
NORTHEAST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of poor cycle performance, poor rate performance and low electronic conductivity of silicon materials

Method used

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  • Preparation method and application of bicontinuous-structural nanocomposite material
  • Preparation method and application of bicontinuous-structural nanocomposite material
  • Preparation method and application of bicontinuous-structural nanocomposite material

Examples

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specific example

[0024] A method for preparing a silicon-carbon continuous dual-phase composite material, the basic implementation process of which is as follows:

[0025] Step 1, the purpose is to prepare porous silicon dioxide with suitable particle size and relatively pure. That is, the raw material diatomite should be pre-treated. The method is: constant temperature calcining in the air atmosphere to remove the organic matter and keep the porous structure from being destroyed. The temperature setting was changed from 5°C / min to 400°C at a heating rate of 1°C / min. After reaching 700°C and keeping the temperature unchanged for 120 minutes, natural cooling can be carried out. The orange color of the calcined diatomite indicates that it contains some impurities of metal oxides. It was refluxed in 6M sulfuric acid at 98° C. for 10 hours to remove these impurities. Wash it with water and ethanol until it becomes neutral, and after drying, it becomes a white powder. At this time, relatively pu...

Embodiment 1

[0031] Diatomaceous earth was calcined at constant temperature under air atmosphere to remove organic matter and keep the porous structure from being destroyed. The temperature setting was changed from 5°C / min to 400°C at a heating rate of 1°C / min. After reaching 700°C and keeping the temperature unchanged for 120 minutes, natural cooling can be carried out. The orange color of the calcined diatomite indicates that it contains some impurities of metal oxides. It was refluxed in 6M sulfuric acid at 98° C. for 10 hours to remove these impurities. Wash it with water and ethanol until it becomes neutral, and after drying, it becomes a white powder. At this time, relatively pure diatomite with silicon dioxide as the main component is obtained. It is ball milled in a ball mill to reduce its particle size. The milling time was set at 10 hours, the rotation speed was 4000 rpm, and the dispersant was ethanol. After ball milling, dry it for later use.

[0032] Carry out magnesium th...

Embodiment 2

[0036] Diatomaceous earth was calcined at constant temperature under air atmosphere to remove organic matter and keep the porous structure from being destroyed. The temperature setting was changed from 5°C / min to 400°C at a heating rate of 1°C / min. After reaching 700°C and keeping the temperature unchanged for 120 minutes, natural cooling can be carried out. The orange color of the calcined diatomite indicates that it contains some impurities of metal oxides. It was refluxed in 6M sulfuric acid at 98° C. for 10 hours to remove these impurities. Wash it with water and ethanol until it becomes neutral, and after drying, it becomes a white powder. At this time, relatively pure diatomite with silicon dioxide as the main component is obtained. It is ball milled in a ball mill to reduce its particle size. The milling time was set at 10 hours, the rotation speed was 4000 rpm, and the dispersant was ethanol. After ball milling, dry it for later use.

[0037] The diatomite obtained...

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Abstract

The invention belongs to the technical fields of nanocomposite material and lithium ion battery, and relates to a bicontinuous-structural composite material and a preparation method and an application thereof in a lithium ion battery negative electrode. The problems are solved by selecting two ways. On one hand, silicon having rich pores is used in design of a silicon material morphology; the existence of the pores can increase the specific surface area of the silicon material, and increases the contact area of the silicon material with an electrolyte solution so as to reduce the transmission distance of lithium ions; and in addition, the existence of the pores can relieve huge volume change during lithium de-intercalation of a carbon material, and improves the cycle performance. On the other hand, the silicon material is composited with a material having good electronic conductivity, and the continuous dual-phase silicon composite material is prepared. The bicontinuous-structural composite material not only can overcome damage on a battery due to huge volume change of the silicon material, but also improves the electronic conductivity of the material.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials and lithium ion batteries, and relates to a bicontinuous structure composite material, a preparation method thereof and an application in lithium ion battery negative poles. Background technique [0002] As people's demand for clean energy and secondary energy continues to increase, materials such as solar cells, fuel cells, and electric double-layer capacitors have been greatly developed. Lithium-ion batteries, in particular, are widely used in portable electronic devices, electric vehicles, robots, and energy storage devices. Even so, its energy density still cannot fully meet people's needs. Synthesizing composite materials is a relatively effective method to increase energy density. Through the compounding of several active substances, their advantages can be better exerted and their shortcomings can be compensated. [0003] Carbon materials have been favored by commercial li...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/362H01M4/386H01M4/62H01M10/0525H01M2004/027Y02E60/10
Inventor 吴兴隆王杰王荣顺
Owner NORTHEAST NORMAL UNIVERSITY
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