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PEO-based solid-state electrolyte, preparation thereof and application of PEO-based solid-state electrolyte in solid-state lithium-sulfur battery

A solid electrolyte and lithium salt technology, which is applied to a polyoxyethylene solid electrolyte, a preparation method thereof, and an application field in a solid lithium-sulfur battery, can solve the problems of unfavorable battery stable cycle, polysulfide dissolution and shuttle, etc. Improved battery safety, uniform Li-ion flux, and loss-avoidance effects

Pending Publication Date: 2022-07-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the molecular structure of PEO units is similar to the properties of ether solvents, which will lead to the dissolution and shuttling of polysulfides, which are intermediate products of discharge, which is not conducive to the stable cycle of the battery.

Method used

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  • PEO-based solid-state electrolyte, preparation thereof and application of PEO-based solid-state electrolyte in solid-state lithium-sulfur battery
  • PEO-based solid-state electrolyte, preparation thereof and application of PEO-based solid-state electrolyte in solid-state lithium-sulfur battery
  • PEO-based solid-state electrolyte, preparation thereof and application of PEO-based solid-state electrolyte in solid-state lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Weigh 0.4344g lithium bistrifluoromethanesulfonimide (LiTFSI), 0.0050g Mg(TFSI) 2 and 0.1500g β-cyclodextrin were placed in a 100mL flat-bottomed flask, then 12.5000g of acetonitrile solvent (AN) was added, ultrasonicated for 10min at 25°C, stirred for 10min, and after a uniform suspension was formed, 1.0000g of polyethylene oxide ( PEO), stirred at room temperature for 12 hours to obtain a slurry; poured the obtained slurry into a mold, stood for 8 hours until the solvent was completely volatilized, and then transferred to a vacuum drying oven at 60 °C for 12 hours to obtain a magnesium salt as the Additive PEO-based composite solid electrolyte. It is then punched into a 19mm diameter disc for use.

[0037](2) Assemble the sulfur / carbon positive electrode, the PEO-based composite solid-state electrolyte with magnesium salt as additive prepared in step (1), and the lithium metal foil negative electrode into an all-solid-state lithium-sulfur battery and conduct elec...

Embodiment 2

[0039] (1) Weigh 0.4344g lithium bistrifluoromethanesulfonimide (LiTFSI), 0.0200g Mg(TFSI) 2 and 0.1500g β-cyclodextrin were placed in a 100mL flat-bottomed flask, then 12.5000g of acetonitrile solvent (AN) was added, ultrasonicated for 10min at 25°C, stirred for 10min, and after a uniform suspension was formed, 1.0000g of polyethylene oxide ( PEO), stirred at room temperature for 12 hours to obtain a slurry; poured the obtained slurry into a mold, stood for 8 hours until the solvent was completely volatilized, and then transferred to a vacuum drying oven at 60 °C for 12 hours to obtain a magnesium salt as the Additive PEO-based composite solid electrolyte. It is then punched into a 19mm diameter disc for use.

[0040] (2) Assemble the sulfur / carbon positive electrode, the PEO-based composite solid-state electrolyte with magnesium salt as additive prepared in step (1), and the lithium metal foil negative electrode into an all-solid-state lithium-sulfur battery and conduct ele...

Embodiment 3

[0042] (1) Weigh 0.4344g lithium bistrifluoromethanesulfonimide (LiTFSI), 0.0300g Mg(TFSI) 2 and 0.1500g β-cyclodextrin were placed in a 100mL flat-bottomed flask, then 12.5000g of acetonitrile solvent (AN) was added, ultrasonicated for 10min at 25°C, stirred for 10min, and after a uniform suspension was formed, 1.0000g of polyethylene oxide ( PEO), stirred at room temperature for 12 hours to obtain a slurry; poured the obtained slurry into a mold, stood for 8 hours until the solvent was completely volatilized, and then transferred to a vacuum drying oven at 60 °C for 12 hours to obtain a magnesium salt as the Additive PEO-based composite solid electrolyte. It is then punched into a 19mm diameter disc for use.

[0043] (2) Assemble the sulfur / carbon positive electrode, the PEO-based composite solid-state electrolyte with magnesium salt as additive prepared in step (1), and the lithium metal foil negative electrode into an all-solid-state lithium-sulfur battery and conduct ele...

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Abstract

The invention discloses a PEO-based solid electrolyte, a preparation method thereof and application of the PEO-based solid electrolyte in a solid-state lithium-sulfur battery. The polyoxyethylene-based solid electrolyte is obtained by uniformly mixing and drying the following components in parts by mass: 40-50 parts of lithium salt, 0.5-3 parts of magnesium salt, 5-20 parts of filler, 1000-1500 parts of solvent and 100 parts of PEO. According to the PEO-based solid electrolyte, bis (trifluoromethylsulfonyl) imide magnesium or magnesium perchlorate is adopted as a functional additive, so that the performance of the PEO-based solid electrolyte can be remarkably improved. The PEO-based composite solid electrolyte containing the magnesium salt additive prepared by the invention is applied to an all-solid-state lithium-sulfur battery for the first time, and shows excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the field of solid-state lithium-sulfur batteries, and in particular relates to a polyethylene oxide (PEO)-based solid electrolyte, a preparation method thereof, and an application in a solid-state lithium-sulfur battery. Background technique [0002] Lithium-sulfur batteries have a high theoretical specific capacity (1675mAh g -1 ), light weight, portability, and low cost, and are considered to be the next-generation energy storage systems with great potential. Since the concept of lithium-sulfur batteries was proposed in the 1960s, great efforts have been made to develop rechargeable lithium-sulfur batteries. However, challenges still remain, the cathode material discharge intermediates are easily dissolved in liquid ether electrolytes and shuttle to the Li metal anode; the intrinsic shuttle effect can lead to the loss of active material and the etching and dendrite growth of the Li metal anode, resulting in severe security...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052H01M10/42
CPCH01M10/0565H01M10/052H01M10/4235H01M2300/0082H01M2300/0091
Inventor 邓远富段欢欢
Owner SOUTH CHINA UNIV OF TECH
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