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Electrolyte of lithium-sulfur battery

A lithium-sulfur battery and electrolyte technology, which is applied in the new lithium-sulfur battery electrolyte field, can solve the problems of thionyl chloride active additives, etc., and achieves a convenient large-scale industrial production, stable electrochemical performance, and improved energy density. Effect

Inactive Publication Date: 2019-02-01
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, there have been no reports of thionyl chloride as an active additive in the electrolyte of lithium-sulfur batteries

Method used

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  • Electrolyte of lithium-sulfur battery
  • Electrolyte of lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Material synthesis: Weigh elemental sulfur (sublimed sulfur, 99%, Sinopharm Chemical Reagent Co., Ltd.) and activated carbon (battery grade, Jiangsu Xianfeng Nano Material Technology Co., Ltd.) in a mass ratio of 6:4, transfer them to a ball mill, add A small amount of ethanol (analytically pure) was wet ball milled at 300r / min for 3h, and the ball milled sample was dried in an oven at 60°C for 6h, and then the dried sample was transferred into a polytetrafluoroethylene reactor. In a muffle furnace (DZ47-60, Hefei Kejing Material Technology Co., Ltd.), the temperature was raised to 155°C at a rate of 2°C / min for 12 hours, and cooled to room temperature to obtain the prepared sample containing 60% sulfur.

[0023] Preparation of electrode materials: Weigh the prepared active material, super conductive carbon black, and binder (polyvinylidene fluoride, PVDF) with a mass ratio of 7:2:1, and mix them thoroughly with a mortar , adding an appropriate amount of N-methyl-2-pyrr...

example 2

[0026] Preparation of electrode materials: Weigh the prepared active material, super conductive carbon black, and binder (polyvinylidene fluoride, PVDF) with a mass ratio of 5:4:1, and mix them thoroughly with a mortar , adding an appropriate amount of N-methyl-2-pyrrolidone (NMP), and stirring for 12 h to obtain a homogeneous slurry. The obtained slurry was uniformly coated on the aluminum foil (current collector) with a coater, dried in a vacuum oven at 60 °C for 12 h, and prepared into a circular electrode sheet with a diameter of 10 mm after oil pressure.

[0027] Battery assembly: In order to avoid the influence of factors irrelevant to the experiment on the experimental results, first clean the cleaned button battery, punched electrode sheets and other materials and tools, and then place them in an oven at 60 °C for 6 h. Then quickly weigh the dried pole pieces, and then immediately put them into the glove box together with other tools. The water and oxygen values ​​of t...

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Abstract

The invention relates to a novel electrolyte of a lithium-sulfur battery, which includes an organic solvent, a lithium salt, and an active additive being thionyl chloride (volume percentage being 0.5-10%); the concentration of the lithium salt is 0.1-2 mol / L; the organic solvent is carbonates. The electrolyte effectively generates an anode material protective film, thus improving stability of thestructure, significantly improving performance, security and energy density of the battery.

Description

technical field [0001] The invention relates to a new lithium-sulfur battery electrolyte. Background technique [0002] With the increasing popularity of portable electronic products and the wide application of new energy vehicles, people put forward higher requirements for the electrochemical performance and safety performance of chemical power sources. Compared with traditional lithium-ion batteries, lithium-sulfur batteries have recently attracted extensive attention due to their higher theoretical specific capacity and environmental friendliness. [0003] However, there are still many problems in the practical application of lithium-sulfur batteries. Among them, it is well known that the discharge intermediate product of lithium-sulfur batteries is high-priced lithium polysulfides. These soluble high-valent polysulfides diffuse to the lithium negative electrode and react with metal lithium to form low-priced polysulfides (Li 2 S. Li 2 S 2 ), these insoluble low-valen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/052H01M10/0567H01M2300/0025Y02E60/10
Inventor 赖超戴宏柳
Owner XUZHOU NORMAL UNIVERSITY
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