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Electrolyte solution for lithium-sulfur battery

A lithium-sulfur battery and electrolyte technology, applied in the field of new energy, can solve problems such as insufficient improvement of battery performance, achieve the effects of increasing capacity, inhibiting corrosion and structural damage, and reducing viscosity

Active Publication Date: 2018-02-09
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An existing electrolyte consists of an electrolyte lithium salt, an organic solvent, and an ionic liquid containing ether-based functional groups. The organic solvent uses conventional ethers, which have a high solubility for lithium polysulfide. To promote the dissolution and diffusion of lithium polysulfide is contradictory to the direction of action of ionic liquid, so the improvement of battery performance is not sufficient

Method used

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  • Electrolyte solution for lithium-sulfur battery
  • Electrolyte solution for lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] After grinding and mixing 75wt% sublimated sulfur and 25wt% nano-carbon black, they were treated in a tube furnace at 150°C for 12h, followed by holding at 250°C for 2h, and then cooled naturally to obtain a sulfur / carbon composite material.

[0025] The above composite material, nano-carbon black and polyvinylidene fluoride are fully mixed in N-methylpyrrolidone at a mass ratio of 8:1:1, coated evenly on aluminum foil, dried in vacuum at 60°C, and punched into sheets.

[0026] In a glove box filled with argon, the above-mentioned sulfur electrode, polyolefin separator and metal lithium sheet were stacked in a sandwich form, and the electrolyte was added dropwise to assemble a CR2025 button battery.

[0027] Electrolyte composition: 1mol / L LiTFSI and 0.1mol / L LiFSI are fully dissolved in PYR 14 In the TFSI, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (TFTFE) is further added to obtain an electrolyte solution, wherein the volume ratio of TFTFE in the electrolyte ...

Embodiment 2

[0029] The preparation of the sulfur-carbon composite material, the manufacture of the sulfur electrode and the assembly of the button battery are the same as in Example 1.

[0030] Electrolyte composition: 0.5mol / L LiClO 4 and 0.3mol / L LiNO 3 Fully soluble in P 13 In the BETA, 1,1,2,2-tetrafluoroethyl ethyl ether (ETFE) was further added to prepare the electrolyte solution, wherein the volume ratio of ETFE in the electrolyte solution was 15%.

Embodiment 3

[0032] The preparation of the sulfur-carbon composite material, the manufacture of the sulfur electrode and the assembly of the button battery are the same as in Example 1.

[0033] Electrolyte composition: 2mol / L LiCF 3 SO 3 Fully soluble in P 1,2O1 In TFSI, then further add 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) to prepare the electrolyte, wherein the volume ratio of TTE in the electrolyte is 85% %.

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Abstract

The invention discloses an electrolyte solution for a lithium-sulfur battery. The electrolyte solution comprises an electrolyte lithium salt, an ionic liquid, a non-solvent liquid and an additive, wherein the viscosity of the non-solvent liquid is lower than that of the used ionic liquid; the solubility of the lithium salt and polysulfide lithium formed in charge and discharge processes in the non-solvent liquid is much lower than the corresponding solubility in the ionic liquid; the additive is another lithium salt with a film-forming function, which is different from the electrolyte lithiumsalt; and fluorinated ether can be selected as the non-solvent liquid. The electrolyte solution mainly aims at developing a complementary synergistic effect of the ionic liquid and the non-solvent liquid; and through assist of the film-forming lithium salt, on one hand, the viscosity of an ionic liquid-based electrolyte solution is reduced and the ionic conductivity of the electrolyte solution isimproved, and on the other hand, the capacity of the electrolyte solution for inhibiting dissolving and shuttling of the polysulfide lithium is strengthened. By adopting the electrolyte solution disclosed by the invention, various negative effects, caused by the polysulfide lithium, to the lithium-sulfur battery are greatly avoided, and the properties, such as the capacity, the cycle performance and the rate capability of the battery are improved as a whole.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to an electrolyte solution for a lithium-sulfur battery. Background technique [0002] Lithium-sulfur battery is a high-energy-density energy storage device with great development potential, but currently there are common problems such as low utilization of active materials, poor cycle stability, and serious self-discharge. In addition to being related to the insulation of elemental sulfur, another main reason is that a series of intermediate products-lithium polysulfide will be formed during the charging and discharging process. These lithium polysulfides are easily dissolved in the electrolyte composed of conventional ether organic solvents. The dissolved lithium polysulfides diffuse to the negative electrode and corrode the negative electrode, thereby forming a shuttle effect, resulting in consumption of active materials, decrease in charge and discharge efficiency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/052H01M10/42
CPCH01M10/052H01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/4235Y02E60/10
Inventor 卢海杜慧玲王金磊刘霄杨庆浩
Owner XIAN UNIV OF SCI & TECH
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