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Preparation method of three-dimensional graphene-Si-MoS<2> composite material

A composite material, -si-mos2 technology, which is applied in the field of preparation of three-dimensional graphene-Si-MoS2 composite materials, can solve the problems of pulverization of Si active materials, difficult to obtain high specific surface area, easy aggregation volume of particles, etc., and achieve buffering. Volume expansion, avoid aggregation, good dispersion effect

Inactive Publication Date: 2018-02-09
XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a three-dimensional graphene-Si-MoS 2 A preparation method for composite materials, which can solve the problems that graphene is easy to agglomerate, difficult to disperse, and difficult to obtain a high specific surface area, and solve the problem of MoS 2 In the process of cycling, the particles are easy to aggregate and their volume expansion in the process of lithium deintercalation, etc., to solve the problem of powdering and peeling of Si active materials

Method used

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  • Preparation method of three-dimensional graphene-Si-MoS&lt;2&gt; composite material
  • Preparation method of three-dimensional graphene-Si-MoS&lt;2&gt; composite material
  • Preparation method of three-dimensional graphene-Si-MoS&lt;2&gt; composite material

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Embodiment 1

[0040] 1) Preparation of three-dimensional graphene:

[0041]Place the nickel mesh (aperture 0.01mm) in a horizontal tube furnace, feed it with argon (flow rate 500s.c.c.m) and hydrogen (200s.c.c.m.), and heat at 1000°C for 10 minutes. After removing the surface oxide layer, Then feed methane gas (5s.c.c.m.), after 5 minutes, turn off methane gas, keep the flow rate of argon and hydrogen constant, quickly cool the sample to room temperature at a rate of 200°C / min, turn off argon and hydrogen, and prepare To obtain a single-layer three-dimensional graphene, coat PMMA on the surface of the nickel mesh / graphene structure; then put it into HCl and H 2 o 2 Remove metallic nickel in a solution with a volume ratio of 1:3, rinse with deionized water; then put the graphene / PMMA sample in acetone to remove PMMA; then soak and wash with ethanol and deionized water for 10 minutes; finally Freeze-dry the cleaned three-dimensional graphene to obtain three-dimensional graphene with complet...

Embodiment 2

[0049] 1) Preparation of three-dimensional graphene

[0050] Place the copper mesh (aperture 0.01mm) in a horizontal tube furnace, feed it with argon (flow rate 600s.c.c.m) and hydrogen (250s.c.c.m.), and heat at 900°C for 20 minutes to remove the surface oxide layer. Then feed methane gas (10s.c.c.m.), after 5 minutes, turn off the methane gas, keep the flow rate of argon and hydrogen constant, quickly cool the sample to room temperature at a rate of 250°C / min, turn off the argon and hydrogen, and prepare To obtain a single-layer three-dimensional graphene, coat PMMA on the surface of the nickel mesh / graphene structure; then put it into HCl and H 2 o 2 Remove metallic nickel in a solution with a volume ratio of 1:3, rinse with deionized water; then put the graphene / PMMA sample in acetone to remove PMMA; then soak and wash with ethanol and deionized water for 10 minutes; finally Freeze-dry the cleaned three-dimensional graphene to obtain three-dimensional graphene with compl...

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Abstract

The invention discloses a preparation method of a three-dimensional graphene-Si-MoS<2> composite material. The preparation method comprises the following steps of 1) preparing three-dimensional graphene; 2) depositing a Si layer on the three-dimensional graphene; and 3) depositing MoS<2> on the Si layer to obtain the three-dimensional graphene-Si-MoS<2> composite material. According to the three-dimensional graphene-Si-MoS<2> composite material provided by the invention, the specific surface area of the three-dimensional graphene is hundreds of thousands of times higher than that of the two-dimensional graphene; Si and MoS<2> are uniformly distributed on the surface of the three-dimensional graphene, so that high dispersity is achieved, aggregation of Si and MoS<2> nanoparticles in the cyclic process can be avoided and volume expansion in the cyclic process also can be relieved effectively; meanwhile, repeated graphene accumulation also can be prevented effectively, thereby improving cycle stability; the specific capacity of the lithium ion battery prepared in the invention reaches 2,000mAh / g, and the initial coulombic efficiency reaches 82%; and after more than 200 cycles, the specific capacity is not obviously attenuated, the capacity retention ratio reaches 97%, and excellent cycle stability is shown.

Description

technical field [0001] The present invention relates to the preparation of a lithium-ion battery negative electrode material, in particular to a three-dimensional graphene-Si-MoS 2 Methods of preparation of composite materials. Background technique [0002] Lithium-ion battery has the characteristics of high voltage, high specific energy, no memory effect, long cycle life, and no environmental pollution. It is currently the most widely used rechargeable mobile power supply. So far, it has been widely used in mobile phones, notebook computers, Digital cameras, electronic translators, etc. Lithium-ion battery anode materials are the core of current lithium-ion battery research. The anode materials of commercial lithium-ion batteries are mostly graphite materials. Graphite has a crystalline layered structure, which is easy for lithium ions to intercalate and deintercalate, forming an interlayer compound LiC6, which is a stable negative electrode material. However, the theor...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/587H01M10/0525
CPCH01M4/366H01M4/386H01M4/5815H01M4/587H01M10/0525H01M2004/021H01M4/36H01M4/38H01M4/58Y02E60/10
Inventor 杨与畅
Owner XIFENG 2D FUJIAN MATERIAL TECH CO LTD