Preparation and application of lithium-sulfur battery positive electrode composite material

A technology of lithium-sulfur batteries and composite materials, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., to achieve the effects of good battery cycle performance, good cycle stability, and novel substrate materials

Inactive Publication Date: 2017-02-22
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] TiO has not yet been utilized 2 Related patent reports on mesogens as substrates for lithium-sulfur batteries

Method used

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  • Preparation and application of lithium-sulfur battery positive electrode composite material
  • Preparation and application of lithium-sulfur battery positive electrode composite material
  • Preparation and application of lithium-sulfur battery positive electrode composite material

Examples

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Embodiment 1

[0021] A method for preparing a lithium-sulfur battery cathode composite material, specifically comprising the steps of:

[0022] (1) 0.5 g anatase TiO 2 The powder was dispersed in 50 mL of 15M KOH solution, stirred for 10 minutes and then transferred to a 75 ml polytetrafluoroethylene-lined autoclave at 180 o C for 72 hours, the resulting precipitate was subjected to 0.1 M H 2 SO 4 The solution was washed several times to pH 1-2, and centrifuged, and then at 70 o Dry in C air for 12 hours to get titanate nanowires;

[0023] (2) Disperse 200 mg of titanate nanowires in 1 M H 2 SO 4 solution, at 70 o C, heated and stirred in a water bath for 7 days, and the white precipitate obtained after natural cooling was washed several times with deionized water, then centrifuged and separated, and then placed in the air for 70 o C dried for 12 hours to obtain anatase phase TiO 2 mesomorph;

[0024] (3) TiO 2 After compound grinding of mesogen and elemental sulfur at a mass ra...

Embodiment 2

[0028] A method for preparing a lithium-sulfur battery cathode composite material, specifically comprising the steps of:

[0029] (1) Add 0.8g anatase TiO 2 The powder was dispersed in 80 mL of 15M KOH solution, stirred for 12 minutes and then transferred to a 90 ml polytetrafluoroethylene-lined autoclave at 150 o C for 80 hours, the resulting precipitate was subjected to 0.1 M H 2 SO 4 The solution was washed several times to pH 1-2, and centrifuged, and then o Dry in C air for 14 hours to obtain titanate nanowires;

[0030] (2) Disperse 200 mg of titanate nanowires in 1 M H 2 SO 4 solution, at 60 o C, heated and stirred in a water bath for 7 days, and the white precipitate obtained after natural cooling was washed several times with deionized water, then centrifuged and separated, and then placed in the air for 60 o C dried for 14 hours to obtain anatase phase TiO 2 mesomorph;

[0031] (3) TiO 2 After compound grinding of mesogen and elemental sulfur at a mass ra...

Embodiment 3

[0034] A method for preparing a lithium-sulfur battery cathode composite material, specifically comprising the steps of:

[0035] (1) Add 1.0g anatase TiO 2 The powder was dispersed in 100mL of 15M KOH solution, stirred for 15 minutes, then transferred to an autoclave with 100 ml of polytetrafluoroethylene lining, at 200 o C for 84 hours, the resulting precipitate was subjected to 0.1 M H 2 SO 4 The solution was washed several times until the pH reached 1-2, and was separated by centrifugation, and then at 80 o Dry in C air for 16 hours to obtain titanate nanowires;

[0036] (2) Disperse titanate nanowires in 1 M H 2 SO 4 solution, at 80 o C, heated and stirred in a water bath for 8 days, and the white precipitate obtained after natural cooling was washed several times with deionized water, then centrifuged and separated, and then placed in the air for 80 o C dried for 16 hours to obtain anatase phase TiO 2 mesomorph;

[0037] (3) TiO 2 After compound grinding of mes...

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Abstract

The invention provides preparation and application of a lithium-sulfur battery positive electrode composite material. A titanate precursor is synthesized by a simple one-step hydrothermal method; titanate is stirred for 7 to 8 days in water bath with the temperature of 60 to 80 DEG C to synthesize anatase-phase TiO2 mesocrystal; and TiO2 mesocrystal and S are compounded to prepare the lithium-sulfur battery positive electrode material. A lithium-sulfur battery obtained by the prepared TiO2 mesocrystal and S composite material serving as a positive electrode has excellent cycle stability, wherein the capacity maintains to be 327.4 mAh/g when the lithium-sulfur battery performs charging and discharging circulation for 500 circles and the current density is 1670 mA/g; and the average capacity of each circle is only 0.085 percent.

Description

technical field [0001] The invention belongs to the field of supercapacitors, and in particular relates to the preparation and application of a lithium-sulfur battery cathode composite material. Background technique [0002] As a promising battery product in the future, lithium-sulfur batteries have received more and more attention due to their high capacity and energy density. However, over the years, due to the unique electrochemical behavior of lithium-sulfur batteries, the continuous loss of capacity and low Coulombic efficiency have resulted. Porous carbon materials are widely used in lithium-sulfur batteries, and it is believed that the loss of elemental sulfur and polysulfides can be limited by physical adsorption between carbon channels or layers. Although this effect can limit the diffusion of polysulfides in a short period of time, polysulfides will eventually diffuse from the positive electrode to the negative electrode. Therefore, inventing a new substrate mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/38H01M10/052
CPCH01M4/362H01M4/38H01M4/48H01M10/052Y02E60/10
Inventor 李亚峰陈凯翔魏明灯
Owner FUZHOU UNIV
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