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Silicon/lithium titanium dioxide ion battery negative electrode material and preparation method thereof

A lithium-ion battery and titanium dioxide technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of restricting large-scale industrial application of materials, high price of nano silicon powder, etc.

Inactive Publication Date: 2017-07-11
TSINGHUA UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0006] The inventors found in the research process that in order to solve this problem, most of the nano-silicon powders are currently selected to carry out compound modification and structural design of raw materials. Although the volume expansion problem in the Si material circulation process has been solved to a certain extent, due to The expensive price of nano-silica powder limits the large-scale industrial application of the material

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  • Silicon/lithium titanium dioxide ion battery negative electrode material and preparation method thereof
  • Silicon/lithium titanium dioxide ion battery negative electrode material and preparation method thereof
  • Silicon/lithium titanium dioxide ion battery negative electrode material and preparation method thereof

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preparation example Construction

[0031] In one aspect of the present invention, the present invention proposes a method for preparing silicon / titanium dioxide lithium ion battery negative electrode material. refer to Figure 5 , the preparation method of the present invention is described in detail. According to an embodiment of the present invention, the preparation method includes:

[0032] S100: preparing SiO 2 hollow ball.

[0033] In this step, SiO can be prepared in advance 2 Hollow spheres, thus, can be used for subsequent coating of TiO on the surface 2 steps to use. According to the embodiment of the present invention, prepare SiO 2 The specific manner of the hollow sphere is not particularly limited, as long as the SiO 2 The hollow spheres can be used in subsequent coating and post-treatment steps, and those skilled in the art can choose according to actual needs. In some embodiments of the invention, SiO 2 Hollow spheres can be prepared by sol-gel method. Thus, using the above method can ...

Embodiment 1

[0057] In this example, a negative electrode material for a silicon / titanium dioxide lithium ion battery was prepared. The specific steps are as follows:

[0058] 1) SiO2 2 Preparation of hollow spheres: Prepare cetyltrimethylammonium bromide (CTAB), ethanol, ammonia water and water with a mass of 0.2g, 40g, 20g, and 100g to prepare a clear solution, then drop 2g of tetraethyl orthosilicate, Reacted for 12 hours; the reactants were centrifuged and washed 5 times, then redispersed in 200mL water, and placed at 70°C for 24 hours to obtain hollow SiO containing CTAB template 2 Then add it to a mixed solution of 150mL ethanol and 200μL hydrochloric acid with a concentration of 36.5v / v%, stir at 55°C for 3 hours, remove the CTAB contained in the material, and obtain hollow SiO with different wall thicknesses 2 ball.

[0059] 2) TiO 2 coated SiO 2 Preparation of hollow spheres: the hollow SiO 2 The spheres were dispersed in a mixed solution of 50g ethanol and 1g water, and 0.5...

Embodiment 2

[0064] In this example, the silicon / titanium dioxide lithium ion battery negative electrode material was prepared according to the same method and conditions as in Example 1. The difference is that, in this embodiment, 1) cetyltrimethylammonium bromide (CTAB), ethanol, ammoniacal liquor and water are formulated into a clear solution with a quality of 0.3g, 50g, 25g, 100g, and then dropped into normal Ethyl silicate 3g, reacted for 24 hours; the reactant was redispersed in 400mL water after being centrifuged and washed 5 times, and placed at 80°C for 36 hours; In the mixed solution, stir at 60°C for 4 hours; 2) the hollow SiO 2 The spheres were dispersed in a mixed solution of 60g ethanol and 1.5g water, and 0.8g tetrabutyl titanate was added to react for 4 hours; 3) 1g hollow SiO 2 @TiO 2 The material was mixed with 1g of magnesium powder, heated to 750°C under an Ar atmosphere, and reacted for 4 hours; then the product was added to 1mol / L hydrochloric acid to react for 6 ho...

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Abstract

The invention provides a silicon / lithium titanium dioxide ion battery negative electrode material and a preparation method thereof. The preparation method comprises (1) preparing SiO2 hollow spheres, (2) coating surfaces of the SiO2 hollow spheres with TiO2 to obtain TiO2-coated SiO2 hollow spheres, and (3) treating the TiO2-coated SiO2 hollow spheres to obtain the silicon / lithium titanium dioxide lithium ion battery negative electrode material. The preparation method can acquire the silicon / lithium titanium dioxide ion battery negative electrode material having the double-spherical shell hollow structure. Through binding action of the TiO2 layer, Si expands inwardly during intercalation. A stable solid electrolyte interface film is formed on the surface of the TiO2 so that silicon negative electrode material cycle stability is significantly improved. The preparation method is free of expensive nano-silicon powder as a raw material, is suitable for mass production and realizes a low cost.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular, the invention relates to a silicon / titanium dioxide lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] In recent years, the rapid development of portable electronic devices and new energy electric vehicle technology has put forward higher requirements for the performance of lithium-ion batteries, which has stimulated the research of a new generation of lithium-ion battery anode materials with high specific capacity and long cycle life. Compared with the current commercial carbon-based anode materials, the theoretical capacity of silicon-based (Si) anode materials has reached more than 10 times that of carbon materials, so it is considered to be the most potential anode material for next-generation lithium-ion batteries. However, due to the huge volume change (300-400%) of Si during the charge-discharge cycle, the elec...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/485H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 汪长安薛伟江
Owner TSINGHUA UNIV
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