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Electrolyte solution for lithium sulfur battery

A technology of electrolyte solution and lithium-sulfur battery, applied in the direction of lithium batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve problems such as inability to meet practical requirements, achieve good stability and improve stability

Inactive Publication Date: 2015-01-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still cannot meet the practical requirements

Method used

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  • Electrolyte solution for lithium sulfur battery
  • Electrolyte solution for lithium sulfur battery
  • Electrolyte solution for lithium sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Electrolyte solution preparation: Conductive salt 0.025mol LiN(SO 3 CF 3 ) 2 and 0.136g of ferrocene were added to a mixed solvent of 12.5ml of ethylene glycol dimethyl ether and 12.5ml of dioxolane, stirred and dissolved, and sealed for use.

[0033] The prepared electrolyte solution was tested for lithium-sulfur battery.

[0034] The battery test method is as follows: the negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 20 microns, and the positive electrode is prepared by the following method: 30 parts by mass of AB carbon, 60 parts by mass of elemental sulfur, and 10 parts by mass of polyvinylidene fluoride (PVDF) blended in N-methylpyrrolidone (NMP), coated onto aluminum foil. The sulfur content in the positive electrode active layer after drying was 1.0 mg / cm2. The above-mentioned components were assembled together in a layered structure of positive electrode / diaphragm / negative electrode, and sealed after adding electrolyt...

Embodiment 2

[0040] Electrolyte solution preparation: Conductive salt 0.025molLiN(SO 3 CF 2 CF 3 ) 2 and 0.15g lithium ferrocenemethoxide was added to 20ml triethylene glycol dimethyl ether (CH 3 O(CH 2 CH 2 O) 3 CH 3 ) and 5ml of dioxolane in a mixed solvent, stirred and dissolved, and sealed for later use. The prepared electrolyte solution was tested for lithium-sulfur battery. The battery testing method is the same as in Example 1. After 100 cycles, the capacity retention rate is shown in Table 1.

Embodiment 3

[0042] Electrolyte solution preparation: Conductive salt 0.05mol LiN(SO 3 CF 2 CF 3 ) 2and 0.2g of 1,1'-lithium ferrocenedimethoxide was added to 12.5ml of ethylene glycol diethyl ether (CH 3 CH 2 OCH 2 CH 2 OCH 2 CH 3 ) and 12.5ml of dioxane in a mixed solvent, stirred and dissolved, and sealed for later use. The prepared electrolyte solution was tested for lithium-sulfur battery. The battery testing method is the same as in Example 1. After 100 cycles, the capacity retention rate is shown in Table 1.

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Abstract

The invention relates to an electrolyte solution for lithium sulfur battery. The electrolyte solution uses solvents comprising one or more than two of chain ether compounds; solutes in the electrolyte solution consist of one or more than two of lithium salts; and one or more than two of ferrocene or ferrocene derivatives account for 0.001-10 wt.%. The electrolyte solution can effectively dissolve irreversible lithium sulfide deposited in charge and discharge of the lithium sulfur battery, so as to achieve the purpose of activation and further improve the stability of lithium sulfur battery.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to an electrolyte solution for lithium-sulfur batteries. Background technique [0002] Since the lithium-sulfur battery was proposed, because of the high theoretical energy density of sulfur (2500Wh kg -1 ), rich in resources and low in price, attracting more and more attention. Especially in recent years, people have made some progress in the capacity retention and Coulombic efficiency of lithium-sulfur batteries by designing battery cathode materials, electrolyte solution compositions, and exploring the mechanism of lithium-sulfur batteries. However, it still cannot meet the practical requirements. [0003] The reasons for the low capacity retention rate and coulombic efficiency of lithium-sulfur batteries are as follows: 1. The shuttle effect of polysulfides on the positive and negative electrodes makes part of the battery charging power lost in the internal chemical rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056
CPCH01M10/052H01M10/0568H01M10/0569H01M2300/0025Y02E60/10
Inventor 曲超张华民张益宁张凤祥
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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