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Lithium-sulfur battery cathode material and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in the field of materials, can solve the problems of reducing the chemical energy storage of lithium-sulfur batteries, hindering application and development, and poor conductivity

Inactive Publication Date: 2018-11-23
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to elemental sulfur (Sulfur, S) and its discharge end product Li 2 S 2 , Li 2 The poor conductivity of S and the fact that the intermediate product lithium polysulfide is easily soluble in the electrolyte during the discharge process causes a serious "shuttle effect", which seriously reduces the electrochemical energy storage of lithium-sulfur batteries and greatly hinders its further application and development.

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  • Lithium-sulfur battery cathode material and preparation method thereof
  • Lithium-sulfur battery cathode material and preparation method thereof
  • Lithium-sulfur battery cathode material and preparation method thereof

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preparation example Construction

[0022] A method for preparing a cathode material for a lithium-sulfur battery provided in an embodiment of the present invention includes:

[0023] S1. Add SnCl dropwise to the uniformly dispersed graphene oxide solution 4 The solution was then stirred evenly, reacted at 175-185°C for 11-13 hours, and then cooled to room temperature to obtain the first product.

[0024] Further, the uniformly dispersed graphene oxide solution was dispersed by ultrasonic for 4 hours.

[0025] In other optional embodiments of the present invention, the above-mentioned graphene oxide solution may also be dispersed using other applicable methods in the art.

[0026] By dispersing the above-mentioned graphene oxide, the graphene oxide solution can be effectively prevented from agglomerating, thereby ensuring good performance of the subsequently prepared lithium-sulfur battery cathode material.

[0027] Further, in this embodiment, the above-mentioned graphene oxide solution can be self-made or pu...

Embodiment 1

[0056] A cathode material for a lithium-sulfur battery provided in this embodiment is prepared as follows:

[0057] Weigh 90mg of GO and add it into 30ml of deionized water, sonicate for 4h to obtain GO dispersion; weigh 0.7g of SnCl 4 ﹒ 5H 2 O was dissolved in 5ml of deionized water, and the GO dispersion was slowly dropped into the GO dispersion using a constant flow pump. After stirring for 30 minutes, the solution was transferred to a 50ml autoclave, reacted at 180°C for 12 hours, cooled to room temperature, and washed by centrifugation. ℃ drying. Under Ar atmosphere, 5°C min -1 Calcined at 450°C for 2 hours, cooled to room temperature to obtain the product, marked as SnO 2 @rGO.

[0058] Weigh SnO according to the mass ratio of 2:1 2 Put @rGO and CNTs into a PTFE ball mill jar, using agate balls Ball mill for 30min at a speed of 200r / min to obtain SnO 2 @rGO / CNTs. The prepared SnO 2 @rGO / CNTs and elemental S were uniformly ground in a certain proportion and the...

Embodiment 2

[0060] A cathode material for a lithium-sulfur battery provided in this embodiment is prepared as follows:

[0061] Weigh 90mg of GO and add it into 30ml of deionized water, sonicate for 4h to obtain GO dispersion; weigh 0.7g of SnCl 4 ﹒ 5H 2 O was dissolved in 5ml of deionized water, and the GO dispersion was slowly dropped into the GO dispersion using a constant flow pump. After stirring for 30 minutes, the solution was transferred to a 50ml autoclave, and reacted at 175°C for 11 hours. After cooling to room temperature, it was centrifuged and washed. ℃ drying. Under Ar atmosphere, 5°C min -1 Calcined at 440°C for 1.5h, cooled to room temperature to obtain the product, marked as SnO 2 @rGO.

[0062] Weigh SnO according to the mass ratio of 2:1 2 Put @rGO and CNTs into a PTFE ball mill jar, using agate balls Ball mill for 30min at a speed of 200r / min to obtain SnO 2 @rGO / CNTs. The prepared SnO 2 @rGO / CNTs and elemental S were uniformly ground in a certain proportio...

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Abstract

The invention relates to the field of materials, in particular to a lithium-sulfur battery cathode material and a preparation method thereof. An oxidized graphene solution which is uniformly dispersedis uniformly stirred after a SnC14 solution is dropwise added into the oxidized graphene solution, the mixture is cooled to room temperature after reaction is carried out at 175-185 DEG C for 11-13 hours, and then a first product is obtained; after the first product is dried at 55-65 DEG C, the first product is cooled to the room temperature after calcination is carried out at 440-460 DEG C for 1.5-2.5 hours, and then SnO2@rGO is obtained; and SnO2@rGO and carbon nano tubes are ball milled and then mixed with S elementary substance, and after the constant temperature heat treatment is carriedout at 150-160 DEG C for 11-13 hours and then cooling is carried out to reach the room temperature, a lithium-sulfur battery cathode material is obtained. The electrochemical performance of lithium-sulfur batteries is improved by using the cooperation effect of strong adsorption of SnO2 to polysulfide and the three-dimensional conductive network constructed by reducing oxidized graphene and the carbon nano tubes.

Description

technical field [0001] The invention relates to the field of materials, in particular to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Due to its high theoretical specific capacity (1675mAh.g -1 ) and theoretical specific energy (2600 Wh.kg -1 ) is known as one of the new energy storage devices with the most research value and application prospects. Its cathode material, elemental sulfur, is rich in resources, low in price, and friendly to the environment. [0003] However, due to elemental sulfur (Sulfur, S) and its discharge end product Li 2 S 2 , Li 2 The poor conductivity of S and the fact that the intermediate product lithium polysulfide is easily soluble in the electrolyte during the discharge process causes a serious "shuttle effect", which seriously reduces the electrochemical energy storage of lithium-sulfur batteries and greatly hinders its further application and development. Therefore, improving th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/624H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 江奇刘青青卢晓英
Owner SOUTHWEST JIAOTONG UNIV
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