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A lithium sulfide battery electrolyte for improving safety and stability

A lithium-sulfur battery and electrolyte technology, applied in the field of electrolyte and lithium-sulfur battery electrolyte, can solve the problems of poor battery stability and safety, unsatisfactory effect, etc., so as to reduce the generation of lithium dendrites, improve safety and Stability, effect of improving stability and cycling performance

Inactive Publication Date: 2019-01-04
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the widely used lithium-sulfur battery at present, because the negative electrode material and the electrolyte are easy to occur, resulting in poor stability and safety of the battery, and the existing method for directly modifying and protecting the lithium negative electrode is not ideal. The present invention proposes a A lithium-sulfur battery electrolyte that improves safety and stability, thereby effectively protecting the metal lithium in the negative electrode, reducing the generation of lithium dendrites, and improving the stability and cycle performance of the battery

Method used

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  • A lithium sulfide battery electrolyte for improving safety and stability

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Effect test

Embodiment 1

[0026] The electrolyte composition is:

[0027] Lithium-sulfur battery electrolyte consists of three parts: lithium salt, solvent and additives.

[0028] Lithium salt is a mixture of lithium bistrifluoromethanesulfonylimide, lithium bisoxalate borate, and lithium difluorooxalate borate; the concentration of lithium salt in the electrolyte is 0.7mol / L; in lithium salt, bistrifluoromethanesulfonyl The mass ratio of lithium imide, lithium bisoxalate borate and lithium difluorooxalate borate is 95:3.9:1.1;

[0029] The solvent is a mixture of dioxolane and tetraethylene glycol dimethyl ether; in the solvent, the volume ratio of dioxolane and tetraethylene glycol dimethyl ether is 1:1;

[0030] The additives are lithium nitrate and phosphorus pentasulfide; the weight percentage of lithium nitrate in the electrolyte is 1.0wt%; the weight percentage of phosphorus pentasulfide in the electrolyte is 1.0wt%.

[0031] The test method is:

[0032] The conventional components such as th...

Embodiment 2

[0035] The electrolyte composition is:

[0036] Lithium-sulfur battery electrolyte consists of three parts: lithium salt, solvent and additives.

[0037] Lithium salt is a mixture of lithium bistrifluoromethanesulfonylimide, lithium bisoxalate borate, and lithium difluorooxalate borate; the concentration of lithium salt in the electrolyte is 0.1mol / L; in lithium salt, bistrifluoromethanesulfonyl The mass ratio of lithium imide, lithium dioxalate borate and lithium difluorooxalate borate is 95:3.0:0.1;

[0038] The solvent is a mixture of dioxolane and tetraethylene glycol dimethyl ether; in the solvent, the volume ratio of dioxolane and tetraethylene glycol dimethyl ether is 1:1;

[0039] The additives are lithium nitrate and phosphorus pentasulfide; the weight percentage of lithium nitrate in the electrolyte is 1.0wt%; the weight percentage of phosphorus pentasulfide in the electrolyte is 0.4wt%.

[0040] The test method is:

[0041] The conventional components such as the...

Embodiment 3

[0044]The electrolyte composition is:

[0045] Lithium-sulfur battery electrolyte consists of three parts: lithium salt, solvent and additives.

[0046] Lithium salt is a mixture of lithium bistrifluoromethanesulfonylimide, lithium bisoxalate borate, and lithium difluorooxalate borate; the concentration of lithium salt in the electrolyte is 1.5mol / L; in lithium salt, bistrifluoromethanesulfonyl The mass ratio of lithium imide, lithium bisoxalate borate and lithium difluorooxalate borate is 95: 4.9: 2.0;

[0047] The solvent is a mixture of dioxolane and tetraethylene glycol dimethyl ether; in the solvent, the volume ratio of dioxolane and tetraethylene glycol dimethyl ether is 1:1;

[0048] The additives are lithium nitrate and phosphorus pentasulfide; the weight percentage of lithium nitrate in the electrolyte is 1.0wt%; the weight percentage of phosphorus pentasulfide in the electrolyte is 1.8wt%.

[0049] The test method is:

[0050] The conventional components such as t...

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Abstract

The invention provides a lithium sulfur battery electrolyte for improving safety and stability. The electrolyte is prepared from lithium salt, solvents and additives, The lithium salt is a mixture oflithium bis-trifluoromethanesulfonimide (LiTFSI), lithium bis-oxalate borate (LiBOB) and lithium difluorooxalate borate (LiODFB), the solvent is a mixture of dioxolane (DOL) and tetraethanol dimethylether (TEGDEM), and the additive is lithium nitrate and phosphorus pentasulfide. The phosphorus sulfide additive in the battery prepared by the electrolyte reacts with the negative electrode lithium metal to form a passivation layer, At that same time, the decomposition of lithium bis (trifluoromethanesulfonimide) on the negative electrode side can be inhibit by the action of lithium bis (oxalate)and lithium difluorooxalate, so that the stability and cycle performance of the battery can be improved. The lithium bis (trifluoromethanesulfonimide) can protect the negative electrode, effectivelyreduce the generation of lithium dendrite and improve the safety of the battery.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to electrolytes, in particular to an electrolyte for lithium-sulfur batteries with improved safety and stability. Background technique [0002] Lithium-sulfur battery has a very high theoretical capacity, and its cost is relatively low, which is the mainstream orientation of the next generation of new energy batteries. However, the safety performance of lithium-sulfur batteries is poor, mainly because the metal lithium in the negative electrode is very reactive and easily reacts with the electrolyte. Lithium dendrites are deposited on the surface of the negative electrode, piercing the separator and causing safety hazards. [0003] At present, considerable progress has been made in the research on the modification of metal lithium as the anode material of lithium-sulfur batteries. In the prior art, a flexible protective film can be formed on the surface of the negative elec...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/052H01M10/42
CPCH01M10/052H01M10/0567H01M10/0568H01M10/4235H01M2300/0025Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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