A kind of all-solid-state lithium metal-sulfur battery and its preparation method

A lithium metal-sulfur battery technology, applied in the field of all-solid-state lithium metal-sulfur batteries and their preparation, achieves the effects of low internal resistance, high cycle stability and high specific capacity of the battery

Active Publication Date: 2022-02-15
湖州天丰电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the existing all-solid-state lithium metal-sulfur battery, and to provide an all-solid-state lithium-metal-sulfur battery using a novel thin-film composite solid electrolyte

Method used

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  • A kind of all-solid-state lithium metal-sulfur battery and its preparation method
  • A kind of all-solid-state lithium metal-sulfur battery and its preparation method
  • A kind of all-solid-state lithium metal-sulfur battery and its preparation method

Examples

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Effect test

Embodiment 1

[0026] Use lithium bistrifluoromethylsulfonyl imide, polyethylene oxide, and tetraethylene glycol dimethyl ether as raw materials, and use acetonitrile as an organic solvent to form a dilute solution in an inert atmosphere, in which bistrifluoromethylsulfonyl The monomer molar ratio of lithium amine to polyethylene oxide is 1:5, and the mass ratio of lithium bistrifluoromethanesulfonimide-polyoxyethylene to tetraethylene glycol dimethyl ether is 1:1. Coated on both sides of the membrane surface, vacuumed and dried at 60°C for 1 hour.

[0027]Sublimed sulfur powder, nano-magnesia powder, carbon nanotubes, Ketjen black, and polyethylene oxide were used as raw materials, and N-methylpyrrolidone was used as a solvent to prepare a slurry, followed by mechanical stirring for 24 hours to obtain a uniform slurry, and then coated On the surface of aluminum foil, vacuum dry at 60°C for 24 hours to remove N-methylpyrrolidone. Then use lithium bistrifluoromethanesulfonimide, polyethylene...

Embodiment 2

[0031] Use lithium bistrifluoromethylsulfonyl imide, polyethylene oxide, and tetraethylene glycol dimethyl ether as raw materials, and use acetonitrile as an organic solvent to form a dilute solution in an inert atmosphere, in which bistrifluoromethylsulfonyl The monomer molar ratio of lithium amine to polyethylene oxide is 1:5, and the mass ratio of lithium bistrifluoromethanesulfonimide-polyoxyethylene to tetraethylene glycol dimethyl ether is 1:1. Coated on both sides of the membrane surface, vacuumed and dried at 60°C for 1 hour.

[0032] Sublimed sulfur powder, nano-magnesia powder, carbon nanotubes, Ketjen black, and polyethylene oxide were used as raw materials, and N-methylpyrrolidone was used as a solvent to prepare a slurry, followed by mechanical stirring for 24 hours to obtain a uniform slurry, and then coated On the surface of aluminum foil, vacuum dry at 60°C for 24 hours to remove N-methylpyrrolidone. Then use lithium bistrifluoromethanesulfonimide, polyethylen...

Embodiment 3

[0035] Use lithium bistrifluoromethylsulfonyl imide, polyethylene oxide, and tetraethylene glycol dimethyl ether as raw materials, and use acetonitrile as an organic solvent to form a dilute solution in an inert atmosphere, in which bistrifluoromethylsulfonyl The monomer molar ratio of lithium amine to polyethylene oxide is 1:5, and the mass ratio of lithium bistrifluoromethanesulfonimide-polyoxyethylene to tetraethylene glycol dimethyl ether is 1:1. Coated on both sides of the membrane surface, vacuumed and dried at 60°C for 1 hour.

[0036] Sublimed sulfur powder, nano-magnesia powder, carbon nanotubes, Ketjen black, and polyethylene oxide were used as raw materials, and N-methylpyrrolidone was used as a solvent to prepare a slurry, followed by mechanical stirring for 24 hours to obtain a uniform slurry, and then coated On the surface of aluminum foil, vacuum dry at 60°C for 24 hours to remove N-methylpyrrolidone. Then use lithium bistrifluoromethanesulfonimide, polyethylen...

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Abstract

The invention discloses an all-solid lithium metal-sulfur battery and a preparation method thereof. At present, all-solid-state lithium metal-sulfur batteries have disadvantages such as high contact resistance between the solid electrolyte and the positive and negative electrodes, excessive thickness of the solid electrolyte, and difficulty in mass production of the solid electrolyte. The electrolyte used in the all-solid-state lithium metal-sulfur battery of the present invention is a film-type composite solid electrolyte of bistrifluoromethylsulfonimide lithium / polyoxyethylene / tetraethylene glycol dimethyl ether@lithium ion battery diaphragm; sulfur positive electrode The materials include sulfur powder, nano-magnesia, carbon nanotubes, Ketjen black and polyethylene oxide; the surface of the sulfur positive electrode is coated with lithium bistrifluoromethanesulfonimide / polyethylene oxide / tetraethylene glycol dimethyl Ether; the surface of the lithium metal negative electrode is coated with lithium bistrifluoromethanesulfonimide / polyoxyethylene / tetraethylene glycol dimethyl ether. The film-type composite solid electrolyte of the present invention can avoid the "shuttle effect" of the sulfur positive electrode, and the prepared all-solid-state lithium metal-sulfur battery has high cycle stability.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to an all-solid lithium metal-sulfur battery and a preparation method thereof. Background technique [0002] According to my country's "Technology Roadmap for Energy Saving and New Energy Vehicles", the specific energy of power lithium-ion batteries will reach 300Wh / Kg in 2020; by 2030, the specific energy will reach 500Wh / Kg, while conventional commercial lithium-ion batteries will reach 300Wh After that, it has basically reached the theoretical ceiling limited by current materials, and it is not only difficult but also extremely unsafe to further increase the specific energy of lithium-ion batteries. Only by setting up a separate stove and completely reforming the old framework of lithium-ion batteries and the corresponding battery materials can it be possible to greatly improve the specific energy of lithium-ion batteries under the premise of ensuring safety. At present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/052H01M10/058
CPCY02E60/10Y02P70/50
Inventor 张鹏谢健楠杨光金明钢陈丽霞韩改格
Owner 湖州天丰电源有限公司
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