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Preparation method of graphene/silicon nanosheet/carbon nanotube composite material

A technology of silicon nanosheets and carbon nanotubes, which is applied in the field of energy materials, can solve the problems that silicon electrodes are prone to fragmentation and pulverization, and affect the electrochemical performance of electrode materials, so as to inhibit the formation of unstable SEI films, raw materials Inexpensive and highly controllable effects

Active Publication Date: 2019-08-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the biggest problem with silicon-based materials is that there is a huge volume change during the alloying and dealloying of silicon and lithium, which makes the silicon electrode extremely prone to fragmentation and pulverization, which in turn affects the electrochemical performance of the electrode material.

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  • Preparation method of graphene/silicon nanosheet/carbon nanotube composite material

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Embodiment 1

[0034] Embodiment 1 of the present invention discloses a preparation method of a graphene / silicon nanosheet / carbon nanotube composite material, and the adopted technical scheme is as follows:

[0035] A graphene / silicon nanosheet / carbon nanotube composite material, characterized in that the mass ratio of the silicon nanosheet, carbon nanotube and graphene is 1:0.5:0.5.

[0036] S1, prepare a silicon nanosheet solution: weigh montmorillonite, magnesium powder, and NaCl in a mass ratio of 1:1:2 to a total of 4 g, mix evenly, and keep at 650 °C for 5 h in an Ar atmosphere for magnesium thermal reduction, and then reduce to room temperature Then, the obtained solid mixture was soaked in a HCl solution with a concentration of 2M and a HF solution with a volume concentration of 5% for more than 2h, to remove unreacted silicon oxide, magnesium powder and Mg. 2 Si and other impurities, washed with distilled water for 5 times, and vacuum-dried at 80 °C for 10 h to obtain silicon nanosh...

Embodiment 2

[0046] Embodiment 2 of the present invention discloses a preparation method of a graphene / silicon nanosheet / carbon nanotube composite material, and the adopted technical scheme is as follows:

[0047] A graphene / silicon nanosheet / carbon nanotube composite material, characterized in that the mass ratio of the silicon nanosheet, carbon nanotube and graphene is 1:1.5:0.5.

[0048] S1, prepare a silicon nanosheet solution: weigh 8 g of montmorillonite, magnesium powder, and NaCl in a mass ratio of 1:1:2, mix evenly, hold at 650 °C for 5 h in an Ar atmosphere for magnesium thermal reduction, and then reduce to room temperature Then, the obtained solid mixture was soaked in HCl solution with a concentration of 2M and a HF solution with a volume concentration of 5% for more than 2 hours to remove impurities such as unreacted silicon oxide, magnesium powder and Mg2Si, and washed with distilled water for 5 times. , 80 ℃ of vacuum drying for 10h to obtain silicon nanosheet material. We...

Embodiment 3

[0055] Embodiment 3 of the present invention discloses a preparation method of a graphene / silicon nanosheet / carbon nanotube composite material, and the adopted technical scheme is as follows:

[0056] A graphene / silicon nanosheet / carbon nanotube composite material, characterized in that the mass ratio of the silicon nanosheet, carbon nanotube and graphene is 1:1:1.

[0057] S1, prepare a silicon nanosheet solution: weigh 4 g of montmorillonite, magnesium powder, and NaCl in a mass ratio of 1:1:1, mix evenly, and keep at 650 °C for 5 h in an Ar atmosphere for magnesium thermal reduction, and then reduce to room temperature Then, the obtained solid mixture was soaked in a HCl solution with a concentration of 2M and a HF solution with a volume concentration of 5% for more than 2h, to remove unreacted silicon oxide, magnesium powder and Mg. 2 Si and other impurities, washed with distilled water for 5 times, and vacuum-dried at 80 °C for 10 h to obtain silicon nanosheet materials. ...

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Abstract

The invention discloses a preparation method of a graphene / silicon nanosheet / carbon nanotube composite material. The composite material is composed of a graphene layer, a silicon nanosheet and a carbon nanotube layer. The preparation method comprises the steps of preparing a silicon nanosheet solution; preparing a carbon nanotube solution; preparing carbon nanotubes attached with a silicon nanosheet material; preparing a graphite oxide solution; preparing a graphite oxide / silicon nanosheet / carbon nanotube composite material; and drying and then carrying out heat treatment in a hydrogen-argon atmosphere for reduction to obtain the graphene / silicon nanosheet / carbon nanotube composite material. The preparation method has the advantages of simple implementation, strong controllability and highrepeatability. In addition, the graphene / silicon nanosheet / carbon nanotube composite material prepared according to the invention has the advantages of high specific capacity, excellent rate performance, good cycle stability and the like, and has broad application prospects in the field of lithium-ion battery negative electrode materials.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a preparation method of a graphene / silicon nanosheet / carbon nanotube composite material. Background technique [0002] Lithium-ion battery is a very important energy storage technology. It has the advantages of high energy density, high discharge voltage, low internal resistance, low self-discharge, no memory effect, environmental protection and no pollution. It can be widely used in various life. Products, such as mobile phones, laptops, hearing aids, cameras, electric vehicles, etc. In addition, lithium-ion batteries are also widely used in modern high-tech fields such as torpedoes, aircraft, and micro-electromechanical systems. Therefore, lithium-ion batteries are ideal new energy sources for human beings. However, there are still many deficiencies in commercial lithium-ion batteries, which make them unable to meet the demand in the application of high specific ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 杜春雨任阳尹旭才周晓明韩国康尹鸽平左朋建高云智霍华程新群马玉林
Owner HARBIN INST OF TECH
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