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SiO2-C nanosphere with core-shell structure and preparation method and application thereof

A technology of core-shell structure and nanospheres, which is applied in the direction of nanotechnology, nanotechnology, structural parts, etc. for materials and surface science. , easy to control, low equipment requirements

Pending Publication Date: 2020-06-19
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to further improve the performance of SiO2 anode materials, researchers from all over the world have tried various modification methods, such as nanonization, surface coating, preparation of core-shell structure, etc., which have greatly helped to improve the performance of the material, but these The technical means used in the method are relatively complicated, involving a variety of complex reactions and sophisticated instruments and equipment, and the conditions are harsh and difficult to control

Method used

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  • SiO2-C nanosphere with core-shell structure and preparation method and application thereof
  • SiO2-C nanosphere with core-shell structure and preparation method and application thereof
  • SiO2-C nanosphere with core-shell structure and preparation method and application thereof

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preparation example Construction

[0023] Embodiments of the present invention provide a core-shell structure of SiO 2 -The preparation method of C nanosphere, it comprises:

[0024] S1. Mix the silicon source precursor and the carbon source precursor to obtain SiO 2 -C nanosphere precursor;

[0025] S2. SiO 2 - Sintering and carbonization of the C nanosphere precursor to obtain a sintered body;

[0026] S3. Partial SiO to sintered body 2 Corroded to obtain SiO 2 -C nanospheres.

[0027] The preparation method can obtain a core-shell structure with a controllable microstructure through simple hydrolysis, condensation, sintering carbonization and corrosion processes, and has the advantages of simple operation, low cost, low equipment requirements, and easy structure regulation.

[0028] The silicon source precursor includes at least one of tetraethylorthosilicate and tetrapropoxysilane. That is, it may be any one of tetraethyl orthosilicate and tetrapropoxysilane, or a mixture of the two.

[0029] The ca...

Embodiment 1

[0039] This embodiment provides a SiO 2 -C nanosphere, its preparation method is as follows:

[0040] Put 140ml of ethanol, 40ml of deionized water, and 6ml of ammonia water (concentration 25%) into a beaker, stir thoroughly (at least 10 minutes), until a uniform solution is formed, add 6.92ml of tetraethyl orthosilicate (TEOS), and continue stirring for 15 Minutes, the solution turned milky white, finally added 0.8g resorcinol and 1.12ml formaldehyde (concentration 37%), stirred at 25°C for 24 hours to form a powder brown liquid, after centrifugal washing, a powder brown product was obtained, put into Dry in a vacuum oven at 60°C for 12 hours, put the dried sample into a quartz boat and keep it at 700°C for 5 hours under an argon atmosphere to obtain a black sample. Divide this sample into multiple parts, and take one part as a control , and the remaining parts were put into 5mol / L NaOH and corroded sequentially at 40°C for 2 hours, 3 hours, 3.5 hours, 4 hours and 12 hours. ...

Embodiment 2

[0043] This embodiment provides a SiO 2 -C nanosphere, its preparation method is as follows:

[0044] Put 140ml of ethanol, 40ml of deionized water, and 6ml of ammonia water (concentration 25%) into a beaker, stir well (at least 10 minutes), until a uniform solution is formed, add 6.92ml of tetrapropoxysilane (TPOS), and continue stirring for 15 minutes , finally add 0.8g resorcinol and 1.12ml formaldehyde (concentration 37%), stir at 25°C for 24 hours to form a brown liquid, after the brown liquid is centrifuged and washed, a brown product is obtained, and then put into a vacuum drying oven Dry at 60°C for 12 hours, place the dried sample in an argon atmosphere and raise the temperature to 700°C and keep it for 5 hours to obtain a black sample, put the sample in 5mol / L NaOH and corrode it at 40°C for 3 hours, the obtained The SEM and TEM of the samples are as in the description of the figures Figure 4 (a) and (c), its structure and lithium storage performance test are as f...

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Abstract

The invention discloses a SiO2-C nanosphere with a core-shell structure and a preparation method and application thereof, and relates to the field of nano energy storage materials. According to the preparation method, the SiO2-C nanosphere is obtained by mixing a silicon source precursor and a carbon source precursor, sintering and corroding, The operation is simple, the raw materials are easy toobtain, the requirement on equipment is low, and the regulation and control are easy. The diameter of the SiO2-C nanospheres prepared by the preparation method can be regulated and controlled within arange of 200-600nm, the core size of internal SiO2 can be regulated and controlled within the range of 50-300nm, and the thickness of the carbon shell and the pore size in the shell can be regulatedand controlled within the range of 20-60nm and the range of 2-10nm respectively. Meanwhile, the SiO2-C nanospheres have relatively high lithium intercalation specific capacity and good cycle life andhave relatively good application value in preparation of the high-capacity anode material of the lithium battery.

Description

technical field [0001] The invention relates to the field of nanometer energy storage materials, in particular to a core-shell structured SiO 2 -C nanosphere and its preparation method and application. Background technique [0002] With the rapid development of science and technology, there are more and more portable electronic devices, such as smartphones, laptops, tablet computers, Bluetooth headsets and other electronic products, and people's dependence on these electronic products is also increasing. The battery life of products has been criticized in recent years, because the main energy storage components of these portable devices - lithium-ion batteries, because of their limited capacity, cannot meet people's needs, so increasing the capacity of lithium-ion batteries is the solution to the battery life of electronic equipment. The key to short time, and in lithium-ion batteries, the impact of electrode materials on capacity is the most significant, new anode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/483H01M4/62H01M4/625H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 周小卫姜宇涵文佳丁志炜关琳琳任杨刘铸
Owner YUNNAN UNIV
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