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Electrolytic solution for lithium-sulfur battery

A lithium-sulfur battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as complex preparation processes, increase battery costs, etc., and achieve the effects of good repeatability, improved utilization, and improved Coulombic efficiency

Active Publication Date: 2018-03-27
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

[0004] In these improvement schemes, it often brings complicated preparation processes and increases the cost of batteries

Method used

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  • Electrolytic solution for lithium-sulfur battery
  • Electrolytic solution for lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve N,N-carbonyldiimidazole (with a water content of 20ppm) with a purity of 99.5% in ethylene glycol dimethyl ether to make a 10% N,N-carbonyldiimidazole solution, and then press the lithium-sulfur battery Addition of 0.5% of the mass of the positive electrode active material Add the N,N-carbonyldiimidazole solution into the standard electrolyte solution of the lithium-sulfur battery to prepare the electrolyte solution.

[0035] Adopt the same process as Comparative Example 1 to prepare the positive electrode and assemble the battery. Others are the same as Comparative Example 1. Test its battery performance. For performance, see figure 1 , figure 2 .

[0036] Test conditions: voltage window: 1.85-2.8V, discharge rate: 0.1C. The benchmark electrolyte for lithium-sulfur batteries is: 1M lithium bis(trifluoromethylsulfonyl)imide solution (LiTFSI) as the electrolyte solution, and the solvents are 1,3-dioxolane (DOL) and ethylene glycol dimethyl ether ( DME) mixtu...

Embodiment 2

[0040] The thiocarbonyldiimidazole (water content is 200ppm) with a purity of 99.8% is dissolved in dimethyl sulfoxide to make a 5% thiocarbonyldiimidazole solution, and then 3% of the lithium-sulfur battery positive active material mass The amount of addition of thiocarbonyl diimidazole solution is added to the standard electrolyte of lithium-sulfur batteries to form an electrolyte.

[0041] The same process as in Comparative Example 1 was used to prepare the positive electrode and assemble the battery, and test its battery performance.

[0042] The difference from Comparative Example 1 is that the reference electrolyte of the lithium-sulfur battery is: 1M lithium bis(trifluoromethylsulfonyl)imide solution (LiTFSI) is the electrolyte solution, and the solvent is dimethyl sulfoxide.

Embodiment 3

[0044] The diphenylimidazole (water content is 50ppm) that the purity is 99% is dissolved in tetraglyme, and the concentration that makes is 5% diphenylimidazole solution, then press lithium-sulfur battery cathode active material quality 0.1% Inject the diphenylimidazole solution into the lithium-sulfur battery reference electrolyte to form an electrolyte.

[0045] The same process as in Comparative Example 1 was used to prepare the positive electrode and assemble the battery, and test its battery performance.

[0046] The difference from Comparative Example 1 is that the lithium-lithium-sulfur battery reference electrolyte is: 1M lithium hexafluorophosphate solution (LiPF 6 ) is an electrolyte solution, and the solvent is a mixture of dimethyl carbonate and ethylene glycol dimethyl ether (DME) (volume ratio v / v=1:1).

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Abstract

The invention relates to an electrolytic solution for a lithium-sulfur battery. The electrolytic solution comprises an electrolyte and a solvent, and is further added with a positive electrode protection agent, wherein the protection agent is one or more than two selected from N,N-carbonyldiimidazole (CDI), N,N-carbonyldiimidazolesulfamide and thiocarbonyldiimidazole, and the addition amount of the positive electrode protection agent is 0.1-5% of the mass of the active substance contained in the positive electrode of a lithium-sulfur battery. Compared to the electrolytic solution in the priorart, the electrolytic solution of the present invention has the following characteristics that the solvent contains the positive electrode protection agent (containing -N bond / -S bond), such that thedissolved sulfur or polysulfide can be effectively adsorbed, the shuttle effect in the lithium-sulfur battery can be inhibited, and the coulombic efficiency of the battery can be improved so as to improve the cycle stability of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to an electrolyte solution for lithium-sulfur batteries. Background technique [0002] In recent years, with the decline of oil production and the intensification of global environmental pollution, countries around the world have generally recognized that clean and pollution-free electric vehicles to replace fuel vehicles is an inevitable choice for a country's sustainable development. The power battery technology with high specific capacity has become the key to the development of pure electric vehicles. At the same time, the rapid development of communication technology, space technology, and national defense industry has greatly promoted the demand for small-volume, high-capacity rechargeable batteries. At present, among the commercialized secondary batteries, the lithium-ion battery is currently the secondary battery with the highest energy density, but the the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 王美日张华民张洪章李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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