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Titanium oxide-coated porous hollow silicon sphere as well as preparation method and application thereof

A technology of silica balls and titanium oxide, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve problems such as environmental protection, poor conductivity, and poor electric cycle performance

Pending Publication Date: 2021-04-06
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a porous hollow silicon ball coated with titanium oxide, its preparation method and its application, so as to solve the problem of poor conductivity and volume change during the cycle when silicon material is used as the negative electrode material of lithium ion battery in the prior art. The problem of poor electrical cycle performance caused by large scale, and the problem that the preparation process is not environmentally friendly

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  • Titanium oxide-coated porous hollow silicon sphere as well as preparation method and application thereof
  • Titanium oxide-coated porous hollow silicon sphere as well as preparation method and application thereof
  • Titanium oxide-coated porous hollow silicon sphere as well as preparation method and application thereof

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preparation example Construction

[0030] In order to solve this problem, the present invention provides a method for preparing porous hollow silica spheres coated with titanium oxide, which includes the following steps: S1, preparing hollow silica spheres containing templates by sol-gel method; S2, Hollow SiO 2 The spheres were subjected to magnesia thermal reduction to obtain hollow silicon spheres containing templates; S3, the surface of hollow silicon spheres was coated with TiO 2-x , where x is 0~0.6, TiO 2-x Coated hollow silica spheres; S4, calcined TiO 2-x coated hollow silicon spheres to obtain titanium oxide-coated porous hollow silicon spheres.

[0031] In the preparation method provided by the invention, the hollow silica spheres containing the template are firstly prepared by a sol-gel method, and then the silica is reduced to silicon by a magnesia thermal reduction method to form the hollow silica spheres containing the template. Secondly, by coating TiO on the surface of hollow silicon spheres...

Embodiment 1

[0045] Add 4ml of ammonia water with a mass fraction of 28% and 0.6g of cetyltrimethylammonium bromide (CTAB) to a mixed solvent containing 120ml of absolute ethanol and 200ml of deionized water, and sonicate for 15min to completely dissolve CTAB. Under vigorous stirring, 4 ml of tetraethyl orthosilicate (TEOS) was dropped into the above liquid dropwise, and stirred at 500 rpm in a water bath at 30° C. for 24 h. The reacted precipitate was centrifuged and washed three times with water and absolute ethanol to remove unreacted TEOS and residual ammonia water. Next, the centrifugally separated precipitate was dispersed in 400 ml of deionized water by ultrasonic treatment, aged in a water bath at 90°C for 24 hours, and the precipitate was centrifuged and washed three times with deionized water. Then the precipitate was dispersed in 320ml of absolute ethanol by ultrasonic treatment, and 900ml of HCI solution with a mass fraction of 37% was added, stirred in a water bath at 60°C at ...

Embodiment 2

[0053] Grind 2g HSiO2, 2.6g magnesium powder and 15g KCl for 30min to mix them evenly. Put the mixed powder into a stainless steel tube, and after passing in Ar gas, seal the stainless steel tube. The stainless steel tube was then placed in a tube furnace at 5 °C min under an Ar atmosphere. The heating rate was from room temperature to 720°C, and then cooled to room temperature after holding for 4 hours. Soak the powder in the stainless steel tube in 300ml of 1mol / L hydrochloric acid solution, centrifuge the precipitate after 4 hours, then soak the precipitate in 200ml of hydrofluoric acid solution with a mass fraction of 5% for 30min, and centrifuge the precipitate. And washed three times with deionized water and absolute ethanol, and finally dried the obtained precipitate in a vacuum oven at 80° C. for 6 hours to obtain MHSi hollow silicon spheres.

[0054] Add 0.5ml of ammonia water with a mass fraction of 28% and 200mg of MHSi into 100ml of absolute ethanol, ultrasonically...

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Abstract

The invention provides a titanium oxide coated porous hollow silicon sphere, and a preparation method and application thereof. The preparation method comprises the following steps: S1, preparing hollow silicon dioxide spheres containing a template agent by adopting a sol-gel method; S2, performing magnesiothermic reduction on the hollow SiO2 spheres to obtain hollow silicon spheres containing a template agent; S3, coating the surfaces of the hollow silicon spheres with TiO2-x, so as to obtain hollow silicon spheres coated with TiO2-x, herein x ranges from 0 to 0.6,; and S4, calcining the TiO2-x coated hollow silicon spheres to obtain the titanium oxide coated porous hollow silicon spheres. The titanium oxide coated porous hollow silicon spheres prepared by the method well solve the problems of poor electrical conductivity and large volume change in the cycle process of the hollow silicon spheres, have good point cycle performance, and are very suitable for being used as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a titanium oxide-coated porous hollow silicon sphere, its preparation method and its application. Background technique [0002] Silicon has a specific capacity 10 times higher than that of graphite and is abundant in storage. It is most likely to replace graphite as the next-generation lithium ion anode material. However, the huge volume change of silicon during cycling will cause particle pulverization and repeated formation of solid electrolyte interfacial film, seriously affecting its cycle life. In addition, the poor conductivity of silicon affects its rate performance. Therefore, structural modification of silicon is often required, such as surface coating of silicon. [0003] Coating carbon on the silicon surface can improve the conductivity of the composite material, and the carbon layer can act as a barrier to prevent silicon from directly contacting the ele...

Claims

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Application Information

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IPC IPC(8): C01B33/023C01G23/053H01M4/36H01M4/62H01M4/38H01M10/0525B82Y40/00
CPCB82Y40/00C01B33/023C01G23/053C01P2002/72C01P2002/85C01P2004/03C01P2004/34C01P2004/61C01P2004/84C01P2006/17H01M4/366H01M4/386H01M4/624H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 白岩关玉明赵晓磊游志江
Owner NORTHERN ALTAIR NANOTECH CO LTD
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