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A kind of graphene composite material and preparation method thereof

A graphene and graphene technology, applied in the field of nano-silicon/graphene/carbon composite electrode materials and its preparation, can solve problems such as cumbersome operation, difficult industrial production, and limited service life

Active Publication Date: 2020-08-28
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This composite method realizes the support of silicon particles on the surface of graphene, but it only alleviates the problem of volume expansion to a certain extent, and the service life is greatly limited.
In 2015, In Hyuk Son of the Samsung Advanced Technology Research Institute in South Korea published an article in "Nature Communication", saying that graphene was successfully grown on the surface of silicon nanowires by high-temperature chemical vapor deposition, but because of the high-temperature chemical vapor deposition method involved, the cost Expensive, cumbersome to operate, difficult to industrialized production

Method used

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  • A kind of graphene composite material and preparation method thereof
  • A kind of graphene composite material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0052] Preparation of Graphene Oxide Colloidal Solution A

[0053] 0.1g-10g of graphene oxide was added to 2000ml of deionized water, and placed in an ultrasonic cleaner for ultrasonic dispersion for 10min under 100W power, to prepare a graphene oxide colloidal solution A with a graphene oxide concentration of 0.05-5mg / mL.

[0054] Specifically, for example, 1 g of graphene oxide was added to 2000 ml of deionized water, and placed in an ultrasonic cleaner for ultrasonic dispersion for 10 min at a power of 100 W to prepare a graphene oxide colloidal solution A with a graphene oxide concentration of 0.5 mg / mL.

preparation example 2

[0056] Preparation of nano-silicon dispersion B

[0057] Disperse 0.025g-25g of nano-silicon with a particle size of 50nm in 500ml of deionized water, and disperse it ultrasonically for 1 hour at a power of 100W to prepare nano-silicon dispersion B with a nano-silicon concentration of 0.05-50mg / mL.

[0058] Specifically, for example, disperse 1 g of nano-silicon with a particle size of 50 nm in 500 ml of deionized water, and disperse it ultrasonically for 1 hour under a power condition of 100 W to prepare a nano-silicon dispersion B with a nano-silicon concentration of 2 mg / mL.

Embodiment 1

[0060] 200mL preparation example 1 prepared graphene oxide concentration is 0.5mg / mL graphene oxide colloidal solution A and 500mL preparation example 2 preparation nano-silicon concentration is 2mg / mL nano-silicon dispersion B mixed and sonicated for 10min minutes, Stir for 1h, add potassium hydroxide, continue stirring for 2h, flocculation and precipitation occur in the mixed solution, after centrifugation and washing, prepare precipitate C (i.e. nano-silicon particles coated with graphene oxide); 0.4g precipitate C and 10g of a mass fraction of 2% polyvinyl alcohol aqueous solution was mixed and ball milled for 4h to obtain a precipitate D (i.e., polyvinyl alcohol-coated graphene oxide-coated nano-silicon particles), which was freeze-dried at -50°C; Solid, under the protection of argon, carbonized at 800 °C for 2 hours at a high temperature to prepare nano-silicon / graphene / carbon composite electrode materials.

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Abstract

The invention discloses a graphene composite material and a preparation method thereof. The graphene composite material has a multi-level core shell coating structure, wherein the nanometer silicon isused as the core, the graphene is used as the first coating layer, the carbon is used as the second coating layer, the surface of the nanometer silicon is coated with the graphene, and the surface ofthe graphene is coated with the carbon. The graphene has high conductivity, mechanical strength and flexibility, and provides a conductive network, an elastic space and a folded structure for the nanometer silicon, thereby being good for inhibiting the damage caused by the volume expansion of the silicon; the carbon can maintain the internal structure stability of the composite material, and prevent the composite electrode material from agglomerating and falling down. The composite electrode material has better stability and conductivity performance when being used for a lithium ion battery.The preparation method is simple in reaction and easy to control, and has a extensive application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a nano-silicon / graphene / carbon composite electrode material and its preparation method and application. Background technique [0002] Lithium-ion battery is an efficient and practical energy storage device, which has been widely used in various portable electronic devices. However, with the development of space technology, national defense technology and electric vehicles, lithium-ion batteries are required to have higher specific capacity and longer cycle life. At present, the general-purpose lithium-ion battery negative electrode is graphite material, and its theoretical capacity (372mAh·g -1 ) is low, which limits the development of high-capacity lithium-ion batteries. In order to develop new high-capacity lithium-ion batteries and / or lithium-ion battery anode materials, researchers have turned their attention to silicon anodes prepared from silicon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 张易宁刘永川苗小飞张祥昕陈素晶陈远强王维程健林嵩岳林长新冯文豆李达禄李歆薛熙来
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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