Silicon and graphene composite material, preparing method thereof and lithium ion battery

A lithium-ion battery and composite material technology, which is applied in the field of lithium-ion batteries, silicon/graphene composite electrode materials and their preparation, can solve the problems of cumbersome preparation steps and large volume expansion, and achieve simple equipment, short time consumption, and easy operation Simple and feasible effect

Inactive Publication Date: 2014-04-16
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation steps of silicon / graphene composite materials reported so far are often cumbersome, and graphene materials need to be prepared first, and then mixed with silicon materials, and the volume expansion of the composite materials is still large when used as electrode materials for lithium-ion batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: 1. Ultrasonically clean the substrate nickel foam with deionized water and dry it; 2. Put the foam nickel into the reaction chamber, fill it with nitrogen, and use mechanical pumps, Roots pumps and molecular pumps to pump the reaction chamber to 10 -3 Pa below, and after keeping for 30 minutes, stop nitrogen filling, turn off the molecular pump, and start heating; 3. When the temperature of nickel foam reaches 500°C, start filling the reaction chamber with methane (flow rate: 300ml / min) and silicon tetrahydrogen ( flow rate: 200ml / min (min), keep the temperature constant, and start to generate silicon / graphene composite materials; 4. After 30 minutes of reaction, stop heating the nickel foam and cool it to room temperature, put the nickel foam into 1mol / L FeCl 3 solution, until the nickel foam is completely dissolved, filter to obtain a solid product, wash the solid product with deionized water, and finally place the solid product in a vacuum oven at 60°C fo...

Embodiment 2

[0024] Example 2: 1. Ultrasonic cleaning the substrate nickel foam with ethanol and drying; 2. Put the foam nickel into the reaction chamber, fill it with nitrogen, and use mechanical pump, Roots pump and molecular pump to pump the reaction chamber step by step to 10 -3 Below Pa, and keep it for 30 minutes, stop nitrogen filling, turn off the molecular pump, and start heating; 3. When the temperature of nickel foam reaches 1000°C, start filling the reaction chamber with ethane (flow rate: 200ml / min) and silicon tetrahydrogen (Flow rate: 300ml / min min), keep the temperature constant, and start to generate silicon / graphene composite materials; 4. After 200 minutes of reaction, stop the foam nickel heating, and cool to room temperature, put the foam nickel into 1mol / L FeCl 3 solution, until the nickel foam is completely dissolved, filter the solid product, wash the solid product with deionized water, and finally place the solid product in a vacuum oven at 60°C for 12 hours to ...

Embodiment 3

[0025] Example 3: 1. Ultrasonic cleaning the substrate nickel foam with acetone and drying; 2. Put the foam nickel into the reaction chamber, fill it with nitrogen, and use a mechanical pump, Roots pump and molecular pump to pump the reaction chamber to 10 -3 Below Pa, and keep it for 20 minutes, stop nitrogen filling, turn off the molecular pump, and start heating; 3. When the temperature of nickel foam reaches 800°C, start filling the reaction chamber with acetylene (flow rate: 50ml / min) and silicon tetrahydrogen ( Flow rate: 150ml / min (min), keep the temperature constant, and start to generate silicon / graphene composite materials; 4. After 240 minutes of reaction, stop heating the nickel foam, and cool to room temperature, put the nickel foam into 1mol / L FeCl 3 solution, until the nickel foam is completely dissolved, filter the solid product, wash the solid product with deionized water, and finally place the solid product in a vacuum oven at 60°C for 12 hours to obtain a ...

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PUM

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Abstract

The invention relates to a method for preparing a silicon and graphene composite material. The silicon and graphene composite material is prepared by a chemical vapour deposition method. The method specifically comprises the following steps: putting substrate nickel foam in an oxygen-free reaction chamber, heating the nickel foam to 500-1300 DEG C, filling a gas carbon source and a gas silicon source, reacting for 30-300 minutes, then putting the nickel foam in a FeC13 solution until the nickel foam is fully dissolved, filtering, washing solid products by deionized water and baking to obtain the silicon and graphene composite material. The invention further relates to a lithium ion battery which is prepared by using the silicon and graphene composite material as a negative electrode material of the lithium ion battery. Compared with the prior art, the prepared silicon and graphene composite material is rich in pores and has excellent energy storage performance and circulating performance when being used as the negative electrode material of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a silicon / graphene composite electrode material and a preparation method thereof. The invention also relates to a lithium ion battery prepared by using the silicon / graphene material as an electrode material. Background technique [0002] As a new type of energy storage device, lithium-ion batteries are being researched by many scientific research institutions and enterprises at home and abroad. With the development of various electronic products, the performance of lithium-ion batteries is increasingly unable to meet the needs of various power-consuming products. At present, graphite is mainly used as the negative electrode material of lithium-ion batteries, and the theoretical capacity of graphite is only 372mAh / g, which greatly limits the performance of lithium-ion batteries. Recently, researchers have discovered that silicon, as an anode material, has a high energy storage ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/38
CPCH01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 周明杰钟辉王要兵袁新生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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