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Electrolyte for lithium-sulfur battery containing sulfide solubilizer

A lithium-sulfur battery and electrolyte technology, which is applied in the field of electrolyte, can solve the problems of low conductivity of sulfur and lithium sulfide, and reduced conductivity of the positive electrode.

Active Publication Date: 2016-12-21
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Second, the electrical conductivity of sulfur and lithium sulfide is extremely low. In order to carry out the electrochemical reaction, a conductive agent (usually a carbon material) and a binder must be added to the positive electrode to form a conductive carbon skeleton.
In 2010, Elazari et al. conducted AFM tests and found that the conductivity of the positive electrode continued to decrease as the number of cycles increased.
In particular, the method of adding a lithium sulfide solubilizer to the electrolyte to improve the rate performance of lithium-sulfur batteries used in this paper has not yet been published in any literature or patent reports.

Method used

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  • Electrolyte for lithium-sulfur battery containing sulfide solubilizer
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  • Electrolyte for lithium-sulfur battery containing sulfide solubilizer

Examples

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Embodiment 1

[0064]A kind of electrolytic solution that the present invention is used for lithium-sulfur battery mainly is made up of electrolytic salt, organic solvent, shuttle inhibitor and sulfide solubilizer, and this electrolytic salt is two (trifluoromethyl) sulfonylimide lithium (LiTFSI ), the concentration in the electrolyte is 1M, the organic solvent is a mixture of 1,3-dioxolane and ethylene glycol dimethyl ether in a volume ratio of 1:1, and the shuttle inhibitor is 0.2M lithium nitrate, sulfide The solubilizer is 4.3% of propylene carbonate, 2.6% of dimethyl sulfoxide, and 0.5% of acetonitrile.

[0065] The preparation method of the above-mentioned electrolyte solution of this embodiment includes the following steps: under the protection of an inert gas, prepare 1,3-dioxolane and ethylene glycol dimethyl ether solvent with a volume ratio of 1:1, and mix 1M bis( Lithium trifluoromethyl)sulfonylimide was dissolved in the mixed solvent, and the mixture was sonicated for 0.5 hours....

Embodiment 2

[0071] A kind of electrolytic solution that the present invention is used for lithium-sulfur battery mainly is made up of electrolytic salt, organic solvent, shuttle inhibitor and sulfide solubilizer, and this electrolytic salt is two (trifluoromethyl) sulfonylimide lithium (LiTFSI ), the concentration in the electrolyte is 1M, the organic solvent is a mixture of 1,3-dioxolane and ethylene glycol dimethyl ether in a volume ratio of 1:1, and the shuttle inhibitor is 0.2M lithium nitrate, sulfide The solubilizer is 2.7% of propylene carbonate, 3.6% of sulfolane, and 0.2% of acetonitrile.

[0072] Except that the electrolyte in this example is used instead of the electrolyte in Example 1, the composition, structure, preparation method and rate performance testing method of the lithium-sulfur battery in this example are exactly the same as those in Example 1.

[0073] at 0.2 mA cm -2 Under the current density, the first discharge specific capacity is 1027mAh / g. After 40 cycles, ...

Embodiment 3

[0075] A kind of electrolytic solution that the present invention is used for lithium-sulfur battery mainly is made up of electrolytic salt, organic solvent, shuttle inhibitor and sulfide solubilizer, and this electrolytic salt is two (trifluoromethyl) sulfonylimide lithium (LiTFSI ), the concentration in the electrolyte is 1M, the organic solvent is a mixture of 1,3-dioxolane and ethylene glycol dimethyl ether in a volume ratio of 1:1, and the shuttle inhibitor is 0.2M lithium nitrate, sulfide The solubilizer is 2.7% of dimethyl carbonate, 1.8% of dimethyl sulfoxide, and 0.3% of acetonitrile.

[0076] Except that the electrolyte in this example is used instead of the electrolyte in Example 1, the composition, structure, preparation method and rate performance testing method of the lithium-sulfur battery in this example are exactly the same as those in Example 1.

[0077] at 0.2 mA cm -2 Under the current density, the first discharge specific capacity is 1110mAh / g. After 40 ...

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Abstract

The invention relates to an electrolyte for a lithium-sulfur battery containing a sulfide solubilizer. The electrolyte mainly comprises an electrolyte salt and an organic solvent, wherein the organic solvent comprises an ether organic solvent and the sulfide solubilizer. The invention discloses a determination method for the solubility of the sulfide in the organic solvent. The invention further discloses a composition method of the sulfide solubilizer. The invention provides the lithium-sulfur battery containing the electrolyte; a negative active material is a lithium metal or a lithium-containing alloy, a positive electrode is formed by alloying and ball-milling of the positive active material, a conductive agent and an adhesive at the ratio, and a positive active material is element sulfur or a sulfur-containing compound. The product provided by the invention has the advantages of being available in raw materials, simple in process and the like, and the rate capability of the lithium-sulfur battery can be improved.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium-sulfur battery, a lithium-sulfur battery containing the electrolyte solution, and specifically relates to an electrolyte solution for a lithium-sulfur battery using a sulfide solubilizer. The invention provides a method for measuring the solubility of organic solvents to sulfides, and also provides a method for compounding sulfide solubilizers. Background technique [0002] In recent years, the rapid development of electric vehicles such as new energy vehicles has increased the demand for lithium secondary batteries. At present, commercial lithium secondary batteries are mainly lithium-ion batteries, and the positive electrode is mainly lithium cobalt oxide (LiCoO 2 ), its theoretical specific capacity is 274mAh g -1 , the actual specific capacity is about 140mAh g -1 , the theoretical specific energy is about 500Whkg -1 . Cathode materials account for about 40% of the cost of lithium-...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052G01N27/42
CPCG01N27/42H01M10/052H01M10/0567H01M2300/0025Y02E60/10
Inventor 潘亦真洪晓斌谢凯王珲熊仕昭李德湛郑春满韩喻李宇杰许静陈一民
Owner NAT UNIV OF DEFENSE TECH
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