Lithium-sulfur battery electrolyte containing low-polarity ether mixed lithium salt

A hybrid lithium salt and lithium sulfur battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of side reactions between lithium anode and electrolyte, rapid capacity decay, etc., and achieve excellent wettability and weak self-discharge effect. , The effect of preventing corrosion

Pending Publication Date: 2022-03-18
南京医电应用科技研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems of rapid capacity fading and serious side reactions between the lithium negative electrode and the electrolyte in the prior art under low-rate cycle conditions of the lithium-sulfur battery, and develops an electrolyte

Method used

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  • Lithium-sulfur battery electrolyte containing low-polarity ether mixed lithium salt
  • Lithium-sulfur battery electrolyte containing low-polarity ether mixed lithium salt
  • Lithium-sulfur battery electrolyte containing low-polarity ether mixed lithium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Respectively, lithium bistrifluoromethanesulfonyl imide, lithium bisfluorosulfonyl imide, tetrahydrofuran, and n-propyl ether were prepared according to the ratio of the following substances:

[0032] Experimental group 1: 4:0:8:2;

[0033] Experimental group 2: 3:1:8:2;

[0034] Experimental group 3: 2:2:8:2;

[0035] Experimental group 4: 1:3:8:2;

[0036] Experimental group 5: 0:4:8:2;

[0037] Control group: Lithium bistrifluoromethanesulfonyl imide was used as a single lithium salt, and a mixed liquid of ethylene glycol dimethyl ether and 1,3-dioxolane in a volume ratio of 1:1 was used as a solvent, and the configuration A solution with a lithium salt concentration of 1 mol / L.

[0038] Use the above electrolyte, lithium sheets, copper sheets, and separators to assemble a lithium-copper half-cell, and at 0.5mA cm -2 current density and 1mAh cm -2 The deposition and stripping coulombic efficiency test is carried out under the areal capacity density; figure 1 A...

Embodiment 2

[0040] Use all the experimental group electrolytes described in Example 1 and lithium sheets, stainless steel gaskets, and separators to assemble lithium steel half cells together, and use the linear voltage sweep method to test the electrochemical window of the electrolyte by the electrochemical workstation, such as figure 2As shown, the oxidation decomposition voltages of electrolytes in all experimental groups were higher than 4V, that is, no oxidation reaction occurred within the working voltage range of lithium-sulfur batteries.

Embodiment 3

[0042] Use the control group described in embodiment 1, experimental group 5 electrolytes to Li 2 S 6 Do a solubility test. In addition, according to lithium bistrifluoromethanesulfonylimide, tetrahydrofuran is 4:10 substance ratio preparation solution (comparison group) and experiment group are compared, lithium sulfide, elemental sulfur are mixed according to specified ratio and excessively Added to the above three groups of solutions and stirred for one hour and then stood still. The lighter the color of the solution supernatant, the smaller the solubility of the solution to lithium polysulfide, indicating that the electrolyte solution proposed by the present invention represented by the experimental group 5 has significantly reduced lithium polysulfide solubility relative to the control group and the contrast group. .

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Abstract

The invention relates to a lithium-sulfur battery electrolyte containing low-polarity ether mixed lithium salt, and belongs to the technical field of lithium-sulfur batteries. The electrolyte contains a mixed lithium salt, a strong-polarity solvent for dissolving the mixed lithium salt and a low-polarity solvent with a dilution effect. The electrolyte can be used for a high-performance lithium-sulfur battery, and plays a role in stabilizing a lithium metal negative electrode and promoting the capacity of a sulfur positive electrode. According to the electrolyte, different lithium salts are added and mixed according to a certain proportion, so that the characteristics of lithium metal negative electrode protection and sulfur positive electrode capacity exertion are achieved, the viscosity of the electrolyte can be reduced by introducing the low-polarity solvent with a dilution effect, the conductivity is improved, the cost is reduced, the wettability is good, and the electrolyte can be applied on a large scale and has very high commercial value.

Description

technical field [0001] The invention relates to a lithium-sulfur battery electrolyte containing mixed lithium salts of low-polarity ethers, belonging to the technical field of lithium-sulfur batteries. Background technique [0002] Lithium-sulfur batteries are likely to become the next generation of secondary batteries due to their very high theoretical specific capacity (1670mAh / g) and the advantages of abundant reserves and low-cost raw material resources. However, the current lithium-sulfur batteries are facing two major problems, namely, the loss of active materials caused by the shuttle effect of lithium polysulfide in the sulfur cathode; and the loss of the reaction between the lithium metal anode and the electrolyte and the growth of dendrites caused by frequent charging and discharging. These problems severely limit the commercial large-scale application of lithium-sulfur batteries. [0003] In response to the above problems, researchers have proposed a series of di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566
CPCH01M10/0566
Inventor 孔熙瑞赵焱孔怡晨
Owner 南京医电应用科技研究院有限公司
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