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Silicon-carbon composite material, preparation method and application thereof

A silicon-carbon composite material and carbon nanomaterial technology, which is applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problem of silicon-carbon structure hindering electron/lithium ion transport performance, etc., and achieve excellent structure/interface stability. , the effect of alleviating volume expansion, improving structure and interface stability

Active Publication Date: 2020-07-03
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention also provides a silicon-carbon composite material and a negative electrode containing it for a lithium-ion battery, but the insufficient contact of the silicon-carbon structure also seriously hinders its electron / lithium ion transport performance

Method used

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  • Silicon-carbon composite material, preparation method and application thereof
  • Silicon-carbon composite material, preparation method and application thereof

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Effect test

Embodiment 1

[0056] This embodiment provides a silicon-carbon composite material, including two-dimensional carbon nanomaterials, two-dimensional silicon nanomaterials, and two-dimensional carbon nanomaterials that are composited face-to-face from top to bottom, and the mass percentage of silicon in the silicon-carbon composite material is The thickness of the two-dimensional silicon nanomaterial is 6nm, and the ratio of the length of the short side to the thickness is 15. The preparation method is as follows: put the two-dimensional silicon nanomaterial prepared by the magnesia thermal reduction method into a high-temperature tube furnace, evacuate through a vacuum device, replace argon, and repeat 3 times to ensure an oxygen-free environment; operate the equipment at 100 sccm h 2 / Ar mixed gas (H 2 The volume fraction is 5%), the temperature is raised to 1100°C at a speed of 5°C / min, and CH is introduced at a speed of 50sccm 4 , keep warm for 20min, and deposit graphene on the two-dime...

Embodiment 2

[0060] This embodiment provides a silicon-carbon composite material, including two-dimensional carbon nanomaterials, two-dimensional silicon nanomaterials, and two-dimensional carbon nanomaterials that are composited face-to-face from top to bottom, and the mass percentage of silicon in the silicon-carbon composite material is The thickness of the two-dimensional silicon nanomaterial is 5.4nm, and the ratio of the length of the short side to the thickness is 20. The preparation method is as follows: disperse the two-dimensional silicon nanomaterial prepared by the chemical oxidation exfoliation method in 1% glucose aqueous solution, add graphene oxide, sonicate for 1 hour, filter, put the filtered material into a high-temperature tube furnace, and pass through a vacuum Vacuumize the device, replace argon, repeat 3 times to ensure an oxygen-free environment; run the equipment at 100 sccm of H 2 / Ar mixed gas (H 2 The volume fraction is 5%), the temperature was raised to 900° C...

Embodiment 3

[0064] This embodiment provides a silicon-carbon composite material, including two-dimensional carbon nanomaterials, two-dimensional silicon nanomaterials, and two-dimensional carbon nanomaterials that are composited face-to-face from top to bottom, and the mass percentage of silicon in the silicon-carbon composite material is is 90%, the thickness of the two-dimensional silicon nanomaterial is 5.4nm, and the aspect ratio is 20. The preparation method is as follows: put the two-dimensional silicon nanomaterials prepared by the chemical oxidation stripping method into a high-temperature tube furnace, evacuate through a vacuum device, replace argon, and repeat 3 times to ensure an oxygen-free environment; h 2 / Ar mixed gas (H 2 The volume fraction is 5%), the temperature is raised to 1100°C at a speed of 5°C / min, and CH is introduced at a speed of 50sccm 4 , keep warm for 10 minutes, and deposit graphene on the two-dimensional silicon nanomaterial to obtain the silicon-carbon ...

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Abstract

The invention relates to a silicon-carbon composite material, a preparation method and application thereof. The silicon-carbon composite material comprises a first two-dimensional carbon nanomateriallayer, a two-dimensional silicon nanomaterial layer and a second two-dimensional carbon nanomaterial layer which are stacked from top to bottom. The preparation method comprises the step of assemblinga two-dimensional carbon nanomaterial on the upper layer surface and the lower layer surface of a two-dimensional silicon nanomaterial layer through a chemical vapor deposition method or a chemical assembly method to obtain the silicon-carbon composite material. According to the preparation method, the raw materials are low in cost and easy to obtain, the preparation process is simple, energy consumption is low, amplification can be achieved, and the prepared composite material has excellent electron / lithium ion transmission characteristics and structure / interface stability and shows extremely excellent charge-discharge specific capacity and cycling stability as a battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a silicon-carbon composite material and a preparation method and application thereof. Background technique [0002] With the depletion of fossil fuels and the rapid development of portable electronic devices and electric vehicles, the research on new energy sources such as power source batteries has become the focus of global attention. Excellent properties such as good performance, environmental friendliness, structural diversity and low price have been widely used. As far as the structure of lithium ion battery is concerned, it is mainly composed of positive electrode, negative electrode, separator and electrolyte, and whether the electrode performance of negative electrode material can be further improved becomes the decisive factor restricting the performance of lithium ion battery. [0003] In view of the development requirements of lithium-ion pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 李祥龙张兴豪智林杰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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