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Film-type composite solid electrolyte, preparation method thereof, and all-solid lithium battery

A solid electrolyte and thin-film technology, applied in the field of solid electrolyte materials for lithium batteries, to achieve the effects of high ionic conductivity, small contact resistance, and simple preparation methods

Inactive Publication Date: 2019-05-10
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 technical problem to be solved by the present invention is to overcome the problems existing in existing lithium batteries, and to provide a film-type composite solid electrolyte suitable for commercial all-solid lithium batteries

Method used

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  • Film-type composite solid electrolyte, preparation method thereof, and all-solid lithium battery
  • Film-type composite solid electrolyte, preparation method thereof, and all-solid lithium battery
  • Film-type composite solid electrolyte, preparation method thereof, and all-solid lithium battery

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Embodiment 1

[0027] Lithium bistrifluoromethanesulfonimide was used as the lithium-conducting agent, polyethylene oxide was used as the polymer and binder, and tetraethylene glycol dimethyl ether was used as the plasticizer. Wherein the monomer molar ratio of bistrifluoromethylsulfonimide lithium and polyethylene oxide is 1:5, the mass ratio of bistrifluoromethylsulfonimide lithium-polyoxyethylene and tetraethylene glycol dimethyl ether 1:1. After weighing, it was dissolved in an acetonitrile solvent so that the concentration of polyethylene oxide was 5 wt%, and heated at 50° C. with magnetic stirring for 3 hours to obtain a uniform solution. Coat a layer of solution on the surface of the lithium-ion battery separator, scrape off the excess solution on the surface, then heat and dry in an oven at 70°C for 5 minutes, then do the same on the other side, and finally dry at 70°C for 1 hour. Test the impedance of the solid electrolyte and calculate the ionic conductivity; assemble into a lithi...

Embodiment 2

[0033] Lithium bistrifluoromethanesulfonyl imide is used as a lithium-conducting agent, polyethylene oxide is used as a polymer and a binder, and tetraethylene glycol dimethyl ether is used as a plasticizer. Wherein the monomer molar ratio of bistrifluoromethylsulfonimide lithium and polyethylene oxide is 1:5, the mass ratio of bistrifluoromethylsulfonimide lithium-polyoxyethylene and tetraethylene glycol dimethyl ether 1:1. After weighing, it was dissolved in an acetonitrile solvent so that the concentration of polyethylene oxide was 5 wt%, and heated at 50° C. with magnetic stirring for 3 hours to obtain a uniform solution. Coat a layer of solution on the surface of the lithium-ion battery separator, scrape off the excess solution on the surface, then heat and dry in an oven at 70°C for 5 minutes, then do the same on the other side, and finally dry at 70°C for 1 hour. Then pack into metal lithium / solid electrolyte / lithium iron phosphate button cell (CR2032), metal lithium / s...

Embodiment 3

[0038] Lithium bistrifluoromethanesulfonyl imide is used as a lithium-conducting agent, polyethylene oxide is used as a polymer and a binder, and tetraethylene glycol dimethyl ether is used as a plasticizer. Wherein the monomer molar ratio of bistrifluoromethylsulfonimide lithium to polyethylene oxide is 1:30, and the mass ratio of bistrifluoromethylsulfonimide lithium-polyoxyethylene to tetraethylene glycol dimethyl ether 1:1. After weighing, it was dissolved in an acetonitrile solvent so that the concentration of polyethylene oxide was 5 wt%, and heated at 50° C. with magnetic stirring for 3 hours to obtain a uniform solution. Coat a layer of solution on the surface of the lithium-ion battery separator, scrape off the excess solution on the surface, then heat and dry in an oven at 70°C for 5 minutes, then do the same on the other side, and finally dry at 70°C for 1 hour. Use a self-made mold to test the impedance of the solid electrolyte and calculate the ionic conductivity...

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Abstract

The invention discloses a film-type composite solid electrolyte, a preparation method thereof, and an all-solid lithium battery. The film-type composite solid electrolyte provided by the invention ismade of the material formed by lithium bisimide / polyoxyethylene / tetraethylene glycol dimethyl ether@lithium ion battery separator, which takes lithium bisimide as a lithium-inducing agent, polyoxyethylene as a polymer and binder, and tetraethylene glycol dimethyl ether as a plasticizer. The preparation method comprises the following steps: under the protection of an inert atmosphere, dissolving lithium bisimide, polyoxyethylene and tetraethylene glycol dimethyl ether in a volatile acetonitrile solvent as precursors for heating and magnetic stirring to form a uniform dilute solution, uniformlycoating the dilute solution on both sides of the lithium ion battery separator, and finally drying. The film-type composite solid electrolyte provided by the invention has many advantages such as highion conductivity at room temperature, wide electrochemical window, and low positive and negative electrode resistances when assembled into an all solid lithium battery, and is suitable for lithium batteries of various positive electrode materials.

Description

technical field [0001] The invention relates to the field of solid electrolyte materials for lithium batteries, in particular to a film-type composite solid electrolyte, a preparation method thereof, and a corresponding all-solid lithium battery. Background technique [0002] Since they were first commercialized in 1991, lithium-ion batteries have played an increasingly important role in modern life due to their high energy density. After nearly 30 years of development, its energy density has gradually approached the theoretical ceiling, and further improvement is not only difficult, but often at the expense of safety and cycle stability. The current lithium-ion battery uses the positive and negative electrode materials to the extreme, and the specific energy density can reach a height of 300Wh / Kg. Specifically, the negative electrode uses a silicon-carbon composite material, and the positive electrode uses a ternary positive electrode material with ultra-high nickel. Howev...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/052H01M10/0525H01M12/08
CPCY02E60/10
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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