Graphene oxide silicon-intercalated nanowire composite material and preparation method thereof

A technology of silicon nanowires and composite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor electrical contact, high cycle performance and high specific capacity of the battery, Problems such as serious material pulverization, to achieve high specific capacity, good cycle performance, and easy industrialization

Active Publication Date: 2016-01-06
王凤鸣
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Problems solved by technology

[0004] The purpose of the present invention is to provide a graphene oxide silicon-embedded nanowire composite material with high capacity and good cycle performance, aiming to solve the serious volume expansion of the existing silicon-containing

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  • Graphene oxide silicon-intercalated nanowire composite material and preparation method thereof
  • Graphene oxide silicon-intercalated nanowire composite material and preparation method thereof
  • Graphene oxide silicon-intercalated nanowire composite material and preparation method thereof

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Example Embodiment

[0027] Correspondingly, an embodiment of the present invention also provides a method for preparing a graphene oxide silicon nanowire composite material, comprising the following steps:

[0028] S01. Graphene oxide pretreatment: use thermal evaporation or magnetron sputtering to deposit a catalyst on the surface of graphene oxide to obtain modified graphene oxide;

[0029] S02. Deposition of silicon nanowires: the modified graphene oxide is placed in a closed device, a silicon source and hydrogen are fed under negative pressure conditions, and the modified graphene oxide is deposited to obtain a surface deposited with silicon Modified graphene oxide for nanowires;

[0030] S03. Carbon coating: a carbon source is introduced, and the silicon nanowires are subjected to carbon deposition treatment under normal pressure conditions to obtain a graphene oxide-silicon-inserted nanowire composite material.

[0031]Specifically, in the above step S01, in order to improve the effect of ...

Example Embodiment

[0046] Example 1

[0047] A graphene oxide embedded silicon nanowire composite material, the graphene oxide embedded silicon nanowire composite material includes modified graphene oxide, silicon nanowires and carbon coating, wherein the modified graphene oxide is a surface Graphene oxide containing a catalyst, and the silicon nanowires are deposited on the surface of the graphene oxide through the catalyst, and the carbon coating layer coats the surface of the silicon nanowires.

[0048] The preparation method of the graphene oxide-inserted silicon nanowire composite material comprises:

[0049] S11. Graphene oxide pretreatment: take 0.5g of graphene oxide and put it into the sputtering equipment, the target material is Ti, and the vacuum degree is 1.4×10 by using a radio frequency power supply. -4 During the sputtering stage, a small amount of Ti is deposited on the surface of the base material as a catalyst, and the sputtering time is 2min;

[0050] S12. Deposition of sili...

Example Embodiment

[0054] Example 2

[0055] A graphene oxide embedded silicon nanowire composite material, the graphene oxide embedded silicon nanowire composite material includes modified graphene oxide, silicon nanowires and carbon coating, wherein the modified graphene oxide is a surface Graphene oxide containing a catalyst, and the silicon nanowires are deposited on the surface of the graphene oxide through the catalyst, and the carbon coating layer coats the surface of the silicon nanowires.

[0056] The preparation method of the graphene oxide-inserted silicon nanowire composite material comprises:

[0057] S21. Graphene oxide pretreatment: take 0.3 g of graphene oxide and put it into the sputtering equipment, the sputtering target is Au, and sputter with a DC power supply when the vacuum degree is 2.1×10-4, and the surface of the graphene oxide is sputtered. A small amount of Au was deposited as a metal catalyst, and the sputtering time was 1 min;

[0058] S22. Deposition of silicon na...

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Abstract

The invention is suitable for the field of lithium-ion battery anode materials, and provides a graphene oxide silicon-intercalated nanowire composite material and a preparation method thereof. The graphene oxide silicon-intercalated nanowire composite material comprises modified graphene oxide, silicon nanowire and a carbon coating layer, wherein the modified graphene oxide is the graphene oxide containing a catalyst on the surface; the silicon nanowire is deposited on the surface of the graphene oxide through induction of the catalyst; and the carbon coating layer coats the surface of the silicon nanowire.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and in particular relates to a graphene oxide embedded silicon nanowire composite material and a preparation method thereof. Background technique [0002] With the development of science and technology, environmental issues have increasingly attracted the attention of the society, and green and environmentally friendly vehicles are increasingly favored by people, which in turn promotes the rapid development of electric vehicles and energy storage battery packs. Lithium-ion batteries are the mainstream energy storage tools. Traditionally, graphite systems are mainly used as negative electrode active materials. Such active materials have excellent electrochemical properties. However, since the theoretical specific capacity of the graphite-based negative electrode system is only 372mAh / g, it is difficult to meet the market demand for large-capacity and high-power...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 石佳光慈立杰丁显波茆胜
Owner 王凤鸣
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