A dilute lithium-sulfur battery electrolyte mixed with lithium salts

A technology of lithium-sulfur batteries and mixed lithium salts, which is applied in the field of lithium-sulfur battery electrolytes, can solve the problems of rapid decay of lithium negative electrode life and the failure of large polarized capacity to function normally, so as to improve anti-oxidation performance, promote cycle stability, The effect of low viscosity

Active Publication Date: 2021-06-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problem that the polarization and large capacity of the high-capacity positive electrode in the prior art cannot be normally exerted and the life of the lithium negative electrode rapidly decays

Method used

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  • A dilute lithium-sulfur battery electrolyte mixed with lithium salts
  • A dilute lithium-sulfur battery electrolyte mixed with lithium salts
  • A dilute lithium-sulfur battery electrolyte mixed with lithium salts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Lithium bisfluorosulfonyl imide, lithium bistrifluoromethylsulfonyl imide, ethylene glycol dimethyl ether, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoroethyl Fluoropropyl ether is made into homogeneous solution by the molar ratio of 0:1:2:4,1:0:2:4,1:1:2:4 (contrast group 1, control group 2 and experimental group successively), Use the above electrolyte, lithium sheets, copper sheets, and separators to assemble a lithium-copper half-cell, and at 1mA cm -2 The Coulombic efficiency test is carried out under the current density, such as figure 1 As shown, in the experimental group in which lithium bisfluorosulfonyl imide and lithium bisfluorosulfonyl imide were added simultaneously, the lithium negative electrode was stable for more than 600 cycles, and the average Coulombic efficiency was higher than 99.4%, while the control group 1 It cannot circulate normally. Although the control group 2 can circulate, the coulombic efficiency is not as good as that of the experimental...

Embodiment 2

[0040] Solvent used is dimethyl carbonate, all the other are with embodiment 1.

Embodiment 3

[0042] Lithium bisfluorosulfonyl imide, lithium bistrifluoromethylsulfonyl imide, ethylene glycol dimethyl ether, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoroethyl Fluoropropyl ether is formulated into a homogeneous solution according to the molar ratio of 1:1:2:4, 1:2:2:4, 2:1:2:4 (proportion 1, ratio 2, ratio 3 in turn), using the above The electrolyte, lithium sheets, copper sheets, and separators are assembled into a lithium-copper half-cell, and the lithium-copper half-cell is -2 The Coulombic efficiency test is carried out under the current density, such as figure 2 As shown, when the ratio 3, that is, the ratio of lithium bisfluorosulfonyl imide to lithium bistrifluorosulfonyl imide is 2:1, the coulombic efficiency of the lithium negative electrode is the highest.

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Abstract

The invention relates to a diluted lithium-sulfur battery electrolyte mixed with lithium salts, belonging to the technical field of lithium-sulfur batteries. The electrolyte contains a mixed lithium salt, a solvent for dissolving the mixed lithium salt, and a diluent. The solvent for the mixed lithium salt is preferably an ester or ether solvent, and the diluent is preferably a fluorinated ether compound or an aromatic compound. This electrolyte solution can be used in high-performance lithium-sulfur batteries, and at the same time play a role in stabilizing the lithium negative electrode and promoting the capacity of the sulfur positive electrode. The electrolyte is mixed by adding different lithium salts in a certain proportion to achieve the dual functions of lithium negative electrode protection and sulfur positive electrode capacity, and the addition of diluent makes the electrolyte have high conductivity, low viscosity, and good infiltration. properties, greatly reduces the cost of electrolyte, can be applied on a large scale, and has extremely high commercial value.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, in particular to a diluted lithium-sulfur battery electrolyte mixed with lithium salts. Background technique [0002] Lithium-sulfur batteries are regarded as promising next-generation secondary batteries due to their high theoretical specific capacity (1670mAh / g) and their extensive material resources and low cost. However, current lithium-sulfur batteries face the shuttle effect of the sulfur cathode, low capacity performance at high loads, and dendrite growth in the lithium anode. These problems have greatly affected the practical application and large-scale commercialization prospects of lithium-sulfur batteries. [0003] For the above problems, although a series of studies have proposed their own solutions, for example, Zhang Jiguang and others at the Pacific Northwest National Laboratory in the United States used local high-concentration electrolytes to improve the solvati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0568H01M10/0569H01M10/0567H01M10/052
CPCH01M10/052H01M10/0567H01M10/0568H01M10/0569H01M2300/0025Y02E60/10
Inventor 谢佳姜智鹏曾子琪胡伟
Owner HUAZHONG UNIV OF SCI & TECH
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