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SnO2/C nanometer hollow sphere material used as lithium ion battery negative electrode and preparation method of SnO2/C nanometer hollow sphere material

A lithium-ion battery, hollow sphere technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as complex preparation process, and achieve the effect of simple preparation method and good electrical performance

Inactive Publication Date: 2017-11-21
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the above SnO 2 The complex preparation process of / C composites has always been a difficult problem to break through

Method used

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  • SnO2/C nanometer hollow sphere material used as lithium ion battery negative electrode and preparation method of SnO2/C nanometer hollow sphere material
  • SnO2/C nanometer hollow sphere material used as lithium ion battery negative electrode and preparation method of SnO2/C nanometer hollow sphere material
  • SnO2/C nanometer hollow sphere material used as lithium ion battery negative electrode and preparation method of SnO2/C nanometer hollow sphere material

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preparation example Construction

[0037] The invention provides a kind of SnO as negative electrode of lithium ion battery 2 The preparation method of / C nanometer hollow sphere material, comprises the following steps:

[0038] A) carrying out surface modification to the nano silicon dioxide sphere prepared by stober method, obtains the nano silicon dioxide sphere through surface modification;

[0039] B) dispersing the phenyltin compound, crosslinking agent and the surface-modified nano-silica spheres in a solvent, and carrying out a crosslinking reaction in the presence of a catalyst to obtain a surface-grafted polymer layer Nano solid ball;

[0040] C) Carrying out carbonization of the nano-solid spheres grafted with a polymer layer on the surface under protective atmosphere conditions and removing the template to obtain SnO 2 / C Nano hollow sphere material.

[0041] In the present invention, the nano-silica spheres are prepared by the stober method, wherein the stober method is preferably:

[0042] Mix...

Embodiment 1

[0097] (1) Add 100 mL of deionized water, 100 mL of absolute ethanol, and 64 mL of ammonia water into a three-necked flask, and place the flask in warm water at 35°C. Then use mechanical stirring and adjust the stirring speed to 300rpm / min, let it fully stir evenly;

[0098] (2) Add 200mL of absolute ethanol and 20mL of tetraethyl orthosilicate into the beaker and stir evenly with a glass rod;

[0099] (3) The solution in step (2) was quickly poured into a flask and stirred for 3 hours at 300 rpm / min.

[0100] (4) The reaction suspension obtained in step (3) is centrifuged at 8000rpm / min, and successively centrifuged three times with absolute ethanol and 1,2-dichloroethane to obtain nano-silica spheres, and its SEM and TEM images Respectively as figure 1 and Figure 5 , figure 1 SEM images of nano-silica spheres prepared by stober method, Figure 5 TEM images of nano-silica spheres prepared by stober method.

[0101] (5) decompose the nano silica prepared by step (4) in ...

Embodiment 2

[0109] (1) Add 100 mL of deionized water, 200 mL of absolute ethanol, and 64 mL of ammonia water into a three-necked flask, and place the flask in warm water at 35°C. Then use mechanical stirring and adjust the stirring speed to 300rpm / min, let it fully stir evenly;

[0110] (2) Add 200mL of absolute ethanol and 10mL of tetraethyl orthosilicate into the beaker and stir evenly with a glass rod;

[0111] (3) The solution in step (2) was quickly poured into a flask and stirred for 3 hours at 300 rpm / min.

[0112] (4) Centrifuge the reaction suspension obtained in step (3) at 8000 rpm / min, and centrifuge three times with absolute ethanol and 1,2-dichloroethane respectively to obtain nano-silica spheres.

[0113] (5) decompose the nano silica prepared by step (4) in a flask with 100mL1,2-dichloroethane and place the flask in an ice-water bath;

[0114] (6) Add 5mL of 4-chloromethyl-p-benzoyl chloride into 40mL of 1,2-dichloroethane, stir evenly, and then slowly drop into the disp...

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Abstract

The invention provides a preparation method of a SnO2 / C nanometer hollow sphere material used as a lithium ion battery negative electrode. The preparation method comprises the following steps of A) performing surface modification on a nanometer silicon dioxide sphere prepared by stober method to obtain a surface-modified nanometer silicon dioxide sphere; B) dispersing a phenyl tin compound, a crosslinking agent and the surface-modified nanometer silicon dioxide sphere in a solvent, and performing crosslinking reaction in the presence of a catalyst to obtain a nanometer solid sphere of which a surface is grafted with a macromolecule layer; and C) removing a template after carbonization on the nanometer solid sphere of which the surface is grafted with the macromolecule layer under a protection atmosphere to obtain the SnO2 / C nanometer hollow sphere material. The preparation method provided by the invention is simple, ultrathin SnO2 particles in the obtained SnO2 / C nanometer hollow sphere material are embedded into a porous carbon structure, and the material has favorable electrical performance when used as the lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a SnO battery as a negative electrode of lithium-ion batteries. 2 / C nanometer hollow sphere material and preparation method thereof. Background technique [0002] With the development of electronic devices and electric vehicles, lithium-ion batteries are playing an increasingly important role in our daily life due to their high energy density and long cycle life. In order to meet the increasing demand for lithium-ion batteries, a lot of work has been done to find new anode materials with high capacity and excellent cycle performance. Graphite has become the most classic anode material due to its special layer structure, but because its theoretical capacity is only 372mAh g -1 , which is far from meeting the current needs. To solve this problem, many studies have been carried out on Si-based materials, metal alloys, metal oxides and metal chalcogenide...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/48H01M4/583H01M10/0525Y02E60/10
Inventor 李柳青李争晖张海燕钟威豪
Owner GUANGDONG UNIV OF TECH
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