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Preparation method of graphene/titanium oxide composite material and application method thereof

A technology of titanium oxide and composite materials, which is applied in the production and application of graphene/titanium oxide composite materials, can solve the problems of unfavorable industrial production, cumbersome and complicated operation process, and high cost, and achieve the suppression of shuttle effect and cycle stability Good, high battery capacity effect

Active Publication Date: 2015-05-06
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(G. Zouetal. Adv. Mater., 2013, 26, 625-631) The above-mentioned method of changing the battery structure has improved some electrochemical performances of the lithium-sulfur battery, but it has been found that the above-mentioned method has high cost or complicated operation process and other issues are not conducive to its industrial production

Method used

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  • Preparation method of graphene/titanium oxide composite material and application method thereof
  • Preparation method of graphene/titanium oxide composite material and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) According to requirements, take graphene sheets and anatase titanium dioxide with a particle size of about 5 nm according to the mass ratio of 100:3, mix and dissolve them in NMP according to the content of 1% mass ratio, stir vigorously and ultrasonically disperse, and wait The slurry reaches the proper viscosity (10-30000cP) and is ready for coating.

[0021] (2) Fully grind and mix the carbon nanotube elemental sulfur, dissolve it in carbon disulfide, stir vigorously and disperse it ultrasonically. After the carbon disulfide is volatilized, transfer the mixture to an oven, heat up to 155°C, keep the temperature for 24h, and cool to obtain carbon nanotube / sulfur The actual sulfur content of the composite cathode material is 51.2% through thermogravimetric analysis.

[0022] The composite material obtained in step (2) is uniformly mixed with acetylene black and polyvinylidene fluoride (PVDF) according to a certain amount of mass percentage (75-98): (0-15): (2-10), ...

Embodiment 2

[0026] Take graphene sheets and anatase titanium dioxide with a particle size of about 10nm at a mass ratio of 100:4, mix and dissolve them in NMP at a mass ratio of 5%, stir vigorously and ultrasonically disperse, and prepare the slurry when it reaches an appropriate viscosity coating.

[0027] Take a certain amount of commercial carbon black and elemental sulfur, grind and mix it thoroughly, dissolve it in carbon disulfide, stir vigorously and ultrasonically, until the carbon disulfide is completely volatilized, transfer the mixture to an oven, heat up to 155°C, keep the temperature for 24 hours, and cool to obtain a carbon black / sulfur composite positive electrode The material had an actual sulfur content of 52.1% as tested by thermogravimetric analysis.

[0028] The coating method and battery testing method are the same as in Example 1, and the resulting battery is charged and discharged 50 times at a current density of 0.5C. Comparing the electrode coated with graphene / t...

Embodiment 3

[0030] Take graphene sheets and anatase titanium dioxide with a particle size of about 15nm at a mass ratio of 100:5, mix and dissolve them in NMP at a mass ratio of 10%, stir vigorously and ultrasonically disperse, and prepare the slurry when it reaches an appropriate viscosity coating.

[0031] Take a certain amount of commercial carbon fiber and elemental sulfur, grind and mix it thoroughly, dissolve it in carbon disulfide, stir vigorously and ultrasonically, until the carbon disulfide is volatilized, transfer the mixture to an oven, raise the temperature to 155 °C, keep the temperature for 24 hours, and cool to obtain a carbon fiber / sulfur composite positive electrode material. Its actual sulfur content is 51.9% as tested by thermogravimetric analysis.

[0032] The coating method and battery testing method are the same as in Example 1, and the resulting battery is charged and discharged 50 times at a current density of 0.5C. Comparing the electrode coated with graphene / ti...

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Abstract

The invention relates to a synthesis and preparation method of a composite material applied to a positive intercalation of a lithium-sulphur battery, and in particular relates to a preparation method and application method of a graphene / titanium oxide composite material. The preparation method comprises the following steps of mixing and dissolving titanium oxide and graphene in an organic solvent to form slurry, and coating the surface of a lithium-sulphur positive material with the slurry. The preparation method is simple to operate and low in cost; furthermore, shuttle effects of polysulfide ions in the lithium-sulphur battery can be effectively inhibited; and the capacity and the cycling performance of the battery are greatly increased.

Description

technical field [0001] The invention relates to a composite material used in lithium battery cathode materials and a manufacturing method thereof, in particular to a graphene / titanium oxide composite material manufacturing method and an application method thereof. Background technique [0002] With the widespread application of lithium-ion secondary batteries in portable products, electric vehicles, and hybrid vehicles, it is particularly urgent to develop new lithium-ion battery materials with high energy density. Since the traditional lithium-ion cathode material battery is a transition metal intercalation compound, it is difficult to greatly increase the energy density of the battery. Among many high-capacity materials, elemental sulfur is one of the most promising positive electrode materials. The battery system composed of sulfur and metal lithium is a two-electron reaction: S+2Li=Li2S, and its theoretical specific capacity is as high as 1675mAh / g. Up to 2600Wh / kg. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/131H01M4/1391
CPCH01M4/366H01M10/0525Y02E60/10
Inventor 杨植肖助兵聂华贵王璐黄少铭
Owner WENZHOU UNIVERSITY
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