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Lithium-sulfur battery positive electrode material prepared by polyaniline modified sodium polyacrylate

A sodium polyacrylate, lithium-sulfur battery technology, applied in battery electrodes, active material electrodes, positive electrodes, etc., can solve the problems of affecting battery cycle stability, complex preparation process, affecting battery life, etc., to achieve positive cycle performance, preparation Simple, low-cost effects

Pending Publication Date: 2019-12-20
YANCHENG ZENGCAI SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The positive electrode active material of lithium-sulfur batteries is sulfur, which has poor conductivity and needs to be compounded with porous carbon materials. The pore structure of carbon materials is highly required. At present, most porous carbon materials are prepared by pore-making, which is costly and complicated. , and the simple use of porous carbon materials will cause lithium polysulfides to dissolve in the electrolyte, which will greatly affect the cycle stability of the battery, thereby affecting the life of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First take 1g of sodium polyacrylate, absorb 100ml of a mixed solution (1:1) of aniline acid solution (0.01mol / L) and ammonium persulfate acid solution (0.01mol / L), freeze-dry, and store in high-purity N 2 Under the atmosphere, react in a tube furnace for 30 minutes at a temperature of 500°C. After the calcination is completed, wash and dry to obtain a nitrogen-doped porous carbon material, which is mixed and ground with elemental sulfur at a ratio of 1:3. Mix it with porous carbon in the same way, and then mix it with acetylene black and PVDF at a ratio of 8:1:1 to make a slurry, coat it, dry it, and cut it into a suitable size. It was used as the positive electrode material to make a button battery. After the electrochemical performance test, the material prepared under this condition had a specific discharge capacity of 929.4mAh / g for the first time, and a discharge specific capacity of 906.5mAh / g after 20 cycles. The capacity retention rate was 97.5%, good cycle per...

Embodiment 2

[0021] First take 1g of sodium polyacrylate, absorb 200ml of a mixed solution (1:1) of aniline acid solution (0.01mol / L) and ammonium persulfate acid solution (0.01mol / L), freeze-dry, and store in high-purity N 2 The reaction was carried out in a tube furnace under the atmosphere for 60 minutes at a temperature of 800° C. After the calcination was completed, it was washed and dried to obtain a nitrogen-doped porous carbon material. Mix and grind it with sulfur at a ratio of 1:3. Elemental sulfur is mixed with porous carbon in the form of sulfur vapor, and then mixed with acetylene black and PVDF at a ratio of 8:1:1 to make a slurry and coat it. Dry and cut to size. It is used as the positive electrode material to make a button battery. After electrochemical performance testing, the material prepared under this condition has a first discharge specific capacity of 1093.5mAh / g, and a discharge specific capacity of 1048.2mAh / g after 20 cycles. The capacity retention rate is 95.9%...

Embodiment 3

[0023] First take 1g of sodium polyacrylate, absorb the mixed solution (1:1) of 500ml of aniline acid solution (0.01mol / L) and ammonium persulfate acid solution (0.01mol / L), freeze-dry, in high-purity N 2 The reaction was carried out in a tube furnace under atmosphere for 120 minutes at a temperature of 900° C. After the calcination was completed, it was washed and dried to obtain a nitrogen-doped porous carbon material. Mix and grind it with sulfur at a ratio of 1:3. Elemental sulfur is mixed with porous carbon in the form of sulfur vapor, and then mixed with acetylene black and PVDF at a ratio of 8:1:1 to make a slurry and coat it. , dried, and cut to suitable size. It was used as the positive electrode material to make a button battery. After the electrochemical performance test, the material prepared under this condition had a specific discharge capacity of 1231.9mAh / g for the first time, and a discharge specific capacity of 1184.8mAh / g after 20 cycles. The capacity retent...

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Abstract

The invention provides a lithium-sulfur battery positive electrode material prepared by polyaniline modified sodium polyacrylate. A certain concentration of aniline hydrochloric acid solution and ammonium persulfate hydrochloric acid solution are prepared and mixed. A certain mass of sodium polyacrylate is taken and a certain amount of mixed solution is absorbed to react for a period of time underthe condition of ice bath and frozen and dried and then carbonized in a tubular furnace at a certain temperature under N2 atmosphere and then washed and dried so as to obtain a nitrogen doped porouscarbon composite material. The porous carbon composite material is ground and mixed with sulfur in a certain proportion in a specific way to prepare a slurry which is coated, dried and cut into a suitable size so as to obtain the electrode material. The electrode material prepared by the nitrogen-sulfur doped sodium polyacrylate has good performance, simple preparation and low cost.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode material prepared by polyaniline-modified sodium polyacrylate, belonging to the field of lithium-sulfur batteries. Background technique [0002] In recent years, new energy vehicles have achieved rapid development. Most countries have issued a timetable for the elimination of fuel-powered vehicles. The development of new energy vehicles is the general trend, and the core of new energy vehicles is power. At present, new energy vehicles generally use lithium Ion batteries provide power, but the current lithium-ion battery anode materials have low energy density, resulting in insufficient cruising range of new energy vehicles, which limits their further development and application. Lithium-sulfur batteries have attracted extensive attention due to their high energy density. [0003] The positive electrode active material of lithium-sulfur batteries is sulfur, which has poor conductivity and needs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/38H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 闵永刚张诗洋刘屹东
Owner YANCHENG ZENGCAI SCI & TECH
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