Composite solvent and electrolyte and application of same in lithium-sulfur battery

A composite solvent and lithium-sulfur battery technology, applied in electrolytes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as reducing the ionic conductivity of the electrolyte, increasing the cost of the electrolyte, and increasing the viscosity of the electrolyte. Achieve the effect of improving Coulombic efficiency, increasing capacity and cycle stability, and improving the effect of adding

Active Publication Date: 2019-11-08
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

CN201510621363 proposes to use fluorinated phosphazene compounds as the flame retardant co-solvent component of the lithium-sulfur battery electrolyte to improve the flammability of the electrolyte. However, the introduction of a large amount of flame retardant co-solvent will reduce the ionic conductivity of the electrolyte and greatly increase the Electrolyte usage cost
Patent CN201710141499 uses a high-concentration lithium salt electrolyte, and uses the same ion effect to reduce the solubility of the electrolyte to polysulfides, thereby alleviating the migration in it, but the increase in the concentration of lithium salt will increase the viscosity of the electrolyte and reduce its conductivity. The wettability of the electrode interface, and the expensive lithium salt greatly increases the cost

Method used

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  • Composite solvent and electrolyte and application of same in lithium-sulfur battery
  • Composite solvent and electrolyte and application of same in lithium-sulfur battery
  • Composite solvent and electrolyte and application of same in lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Prepare the lithium-sulfur battery by configuring the electrolyte as follows:

[0048] ①Electrolyte configuration: in a glove box with argon atmosphere (H 2 O1 , R 2 for -(CH 2 ) 2 CH 3 )=45:45:10 mixed with lithium salts LiTFSI (1M) and LiDFOB (0.05M), added anhydrous lithium nitrate with a total mass of 2%, and stirred well to obtain the lithium-sulfur battery electrolyte of the present invention.

[0049] ②Preparation of sulfur positive electrode: mix sulfur / carbon composite material (sulfur load of 80%), acetylene black, and PVDF in a ratio of 80:10:10, and then add an appropriate volume of N-methylpyrrolidone (NMP) Stir in a slurry machine to form a stable and uniform positive electrode slurry. The slurry was coated on a carbon-coated aluminum foil with a doctor blade, and dried in an oven at 80°C for 8 hours until the NMP was completely volatilized.

[0050] ③Lithium-sulfur button battery assembly test: The prepared sulfur pole piece was punched into a Φ13mm...

Embodiment 2-4

[0052] Except that the ratio of co-solvent A in Table 1 is changed, other parameters and preparation methods are the same as in Example 1.

Embodiment 2-974

[0054]

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PUM

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Abstract

The invention belongs to the technical field of lithium-sulfur battery electrolyte, and particularly discloses a composite solvent of a lithium-sulfur battery, which comprises an organic solvent and acosolvent A; the invention further discloses an electrolyte of the lithium-sulfur battery. The electrolyte comprises a conductive lithium salt and the composite solvent. In addition, the invention also comprises a lithium-sulfur battery added with the electrolyte. The cosolvent disclosed by the invention has a structure as shown in a formula 1; on one hand, the solubility of an electrolyte systemto polysulfide is reduced by taking the cosolvent, on the other hand, the components of a solid electrolyte membrane on the surface of a lithium metal are optimized, and the capacity retention and coulombic efficiency of the battery are improved.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a lithium-sulfur battery and its composite solvent and electrolyte. Background technique [0002] In recent years, lithium-sulfur batteries have attracted the attention of researchers because of their high energy density (2500Wh / kg, 2800Wh / L), wide source of active material sulfur, and low price. One of the energy density energy storage devices. However, due to its complex electrochemical reaction mechanism, some problems seriously restrict the practical application of lithium-sulfur batteries. Due to the discharge intermediate long-chain polysulfide Li 2 S X ( X =4~8) It is very easy to dissolve in the ether electrolyte, which leads to the low actual utilization rate of the positive electrode active material, causing the actual specific capacity of the first cycle to be far lower than the theoretical capacity (1675mAh / g) of elemental sulfur; Under the action of conce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0525H01M10/42
CPCH01M10/0569H01M10/0525H01M10/4235H01M2300/0091Y02E60/10
Inventor 洪波赖延清向前王大鹏史晨阳张凯方静张治安
Owner CENT SOUTH UNIV
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