Three-dimensional graphene/silicon composite system, its preparation method and application

A graphene, three-dimensional technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low electronic conductivity and large volume effect, and achieve the effect of high electronic conductivity, small volume effect and high efficiency

Active Publication Date: 2020-09-01
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems in the silicon anode, such as huge volume effect (-320%), low electronic conductivity (~2.5×10 -4 S m -1 ), etc., thus limiting its application

Method used

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  • Three-dimensional graphene/silicon composite system, its preparation method and application
  • Three-dimensional graphene/silicon composite system, its preparation method and application

Examples

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preparation example Construction

[0022] A method for preparing a three-dimensional graphene / silicon composite system provided by an aspect of the embodiments of the present invention includes:

[0023] Composite transition metal elemental substance and / or compound containing transition metal elements with silicon nanoparticles, and then carry out high-temperature reduction in a reducing atmosphere at 400-1000°C to prepare a three-dimensional porous metal catalyst template / silicon composite system;

[0024] Using a chemical vapor deposition method to grow three-dimensional graphene on the three-dimensional porous metal catalyst template / silicon composite system to obtain a three-dimensional graphene / silicon composite system with a catalyst skeleton;

[0025] The three-dimensional graphene / silicon composite system with the catalyst skeleton is etched to obtain a three-dimensional graphene / silicon composite powder.

[0026] Further, in the three-dimensional porous metal catalyst template / silicon composite system...

Embodiment 1

[0058] Example 1: Put 20g of nickel chloride into a tube furnace and keep it at 600°C for 10 minutes. The atmosphere is: hydrogen: 300 sccm, argon: 100 sccm. Then raise the tube furnace to 1000°C and keep it at 1000°C for 10 minutes. At this time, the atmosphere is: methane: 30 sccm, hydrogen: 200 sccm, argon: 200 sccm. The quartz tube was taken out and cooled to room temperature. with 1M FeCl 3 / 0.1M HCl for etching to finally obtain three-dimensional graphene powder. Add 0.5g of nano silicon powder, 0.05g of polyvinylpyrrolidone and 0.01g of silane coupling agent KH550 into 10g of N-methylpyrrolidone and sonicate for 1h. After immersing the three-dimensional graphene in the above solution for 30min, take it out and dry it to obtain a three-dimensional graphene / Silicon composite system.

Embodiment 2

[0059] Example 2: After grinding and mixing 20g of nickel chloride and 0.5g of silicon nanoparticles for 0.5h, they were put into a tube furnace, kept at 600°C for 10 minutes, and the atmosphere was: hydrogen: 300 sccm, argon: 100 sccm. Then raise the tube furnace to 1000°C and keep it at 1000°C for 10 minutes. At this time, the atmosphere is: methane: 30 sccm, hydrogen: 200 sccm, argon: 200 sccm. The quartz tube was taken out and cooled to room temperature. After etching with 3M HCl, washing with water, and drying, a three-dimensional graphene / silicon composite system (such as figure 1 ).

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Abstract

The invention discloses a three-dimensional graphene / silicon composite system, its preparation method and application. The preparation method may include: compounding a transition metal element and / or a compound containing a transition metal element with silicon nanoparticles, and then reducing at a high temperature in a reducing atmosphere to obtain a three-dimensional porous metal catalyst template / silicon composite system, and then using chemical The vapor phase deposition method is to grow three-dimensional graphene on the composite system to obtain a three-dimensional graphene / silicon composite system with a catalyst skeleton, and then perform etching treatment to obtain a three-dimensional graphene / silicon composite powder. The three-dimensional graphene / silicon composite system of the present invention not only has small volume effect, high electronic conductivity, and strong flexibility, but also has excellent thermal conductivity and mechanical properties, and has wide application prospects, especially when applied to lithium-ion battery negative electrode materials. The cycle life and stability of the battery can be improved under the condition of ensuring the electrode capacity, and the preparation process is simple and efficient, and is suitable for large-scale implementation.

Description

technical field [0001] The invention specifically relates to a three-dimensional graphene / silicon composite system, its preparation method and application, and belongs to the field of nanotechnology and new energy application. Background technique [0002] Silicon material has the highest theoretical specific capacity (4200mAhg -1 ), moderate de-lithium / intercalation potential (0.02~0.6Vvs.Li / Li + ), high safety, low cost, and environmental friendliness, it has become one of the anode materials for lithium-ion batteries with great application prospects. However, there are still some problems in the silicon anode, such as huge volume effect (-320%), low electronic conductivity (~2.5×10 -4 S m -1 ), etc., thus limiting its application. Contents of the invention [0003] The main purpose of the present invention is to provide a three-dimensional graphene / silicon composite system, its preparation method and application, so as to overcome the deficiencies in the prior art....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/364H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 刘立伟李伟伟曾奇张慧涛郭玉芬李奇陈明亮
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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