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Metal thio compound @ S composite material and preparation and application thereof in lithium-sulfur battery

A technology of metal thio compounds and composite materials, applied in the direction of lithium batteries, battery electrodes, active material electrodes, etc., can solve the problems of poor lithium conduction performance and unsatisfactory electrical performance

Active Publication Date: 2020-04-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical deficiencies of poor lithium conduction performance and unsatisfactory electrical performance of the existing lithium-sulfur battery coated positive electrode materials, the first purpose of the present invention is to provide a metal sulfide compound@S composite material (the present invention is also referred to as composite materials), aiming at improving the lithium-conducting and electron-conducting properties of sulfur-coated materials, and improving the electrical properties of positive electrode active materials for lithium-sulfur batteries

Method used

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  • Metal thio compound @ S composite material and preparation and application thereof in lithium-sulfur battery
  • Metal thio compound @ S composite material and preparation and application thereof in lithium-sulfur battery
  • Metal thio compound @ S composite material and preparation and application thereof in lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Preparation of positive electrode material: Weigh 1.6g of elemental S, 3.58g of dimethylammonium dimethyldithiocarbamate and 0.348g of sodium dodecylbenzenesulfonate in 100mL of deionized water for ultrasonic dispersion for 1 hour. After the ultrasound is finished, transfer it to a water bath, set the heating temperature to 70°C, slowly add the prepared 0.05mol / L silver nitrate solution dropwise, react for 12 hours and then cool naturally. The reaction solution was placed in a centrifuge tube and centrifuged at a speed of 8000 r / min, and the centrifuged filter residue was alternately washed three times with deionized water and ethanol and dried at 60° C. for 24 hours to obtain the positive electrode material.

[0074] Lithium-sulfur battery assembly and testing: Slurry prepared with organometallic thio compound-coated sulfur element, acetylene black, and PVDF in a ratio of 6:3:1 was coated on carbon-coated aluminum foil to prepare a positive electrode, and the prepared p...

Embodiment 2

[0076] Preparation of positive electrode material: Weigh 1.6g elemental S, 3.32g sodium dimethyldithiocarbamate and 0.56g N-polyvinylpyrrolidone in 80mL deionized water for ultrasonic dispersion for 1 hour. After the ultrasound is finished, transfer it to a water bath, set the heating temperature to 70°C, slowly add the prepared 0.05mol / L lithium acetate solution dropwise, react for 12 hours and then cool naturally. The reaction solution was placed in a centrifuge tube and centrifuged at a speed of 8000 r / min, and the centrifuged filter residue was alternately washed three times with deionized water and ethanol and dried at 60° C. for 24 hours to obtain the positive electrode material.

[0077] Lithium-sulfur battery assembly and testing: Slurry prepared with organometallic thio compound-coated sulfur element, acetylene black, and PVDF in a ratio of 6:3:1 was coated on carbon-coated aluminum foil to prepare a positive electrode, and the prepared positive electrode sheet was pun...

Embodiment 3

[0079] Preparation of positive electrode material: Weigh 1.6g of elemental S, 3.32g of sodium dimethyldithiocarbamate and 0.56g of sodium dodecylbenzenesulfonate and place them in 80mL of deionized water for ultrasonic dispersion for 1 hour. After the ultrasound is finished, transfer it to a water bath, set the heating temperature to 70°C, slowly add the prepared 0.02mol / L copper chloride solution dropwise, react for 12 hours and then cool naturally. The reaction liquid was placed in a centrifuge tube and centrifuged at a speed of 8000 r / min. The filter residue obtained by centrifugation was alternately washed three times with deionized water and ethanol and dried at 60° C. for 24 hours to obtain the positive electrode material.

[0080] Lithium-sulfur battery assembly and testing: Slurry prepared by coating organometallic thio compound-coated sulfur element, acetylene black, and PVDF in a ratio of 6:3:1 was coated on carbon-coated aluminum foil to prepare a positive electrode,...

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Abstract

The invention relates to a metal thio compound @ S composite material and preparation and application thereof in a lithium-sulfur battery. The material is characterized in that the metal thio compound@ S composite material comprises a core and a coating material for coating the core; the core is made of elemental sulfur; the coating material is at least one metal thio compound with a right figurestructural formula, wherein R is alkyl, tertiary amino or ether, M is a metal element of Li, Zn, Cu, Cd, Ca, Bi, Pb, Ni, Sn, Fe, Co or Ag, and n is the chemical value of M. The organic metal thio compound has good lithium ion transmission capacity. Lithium ion transmission under the tight coating condition is guaranteed, and certain electronic conductivity can be provided. Compared with the existing inorganic coating layer, the coating layer provided by the invention is more elastic, and can relieve the cracking and falling of the coating layer caused by the volume change in the charging anddischarging process of elemental sulfur. The organic metal thio compound can provide a certain capacity.

Description

technical field [0001] The invention relates to a method for preparing a lithium-sulfur battery positive electrode material and an application thereof, belonging to the field of lithium-sulfur secondary batteries. Background technique [0002] With the development of society, on the one hand, the performance requirements of the public for portable electronic products are constantly improving; The grid began to develop rapidly. These two reasons make people have higher and higher requirements for the energy density and power density of lithium-ion batteries. However, due to the limitation of the theoretical lithium storage capacity of the battery system and electrode materials, it is difficult for the current lithium-ion battery system with the best comprehensive performance Meet the requirements of the future society for high specific energy. [0003] Lithium-sulfur batteries have become the most promising substitutes for lithium-ion batteries because their theoretical ene...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/624H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 赖延清洪波向前王大鹏张治安张凯方静
Owner CENT SOUTH UNIV
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