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
CN110429339AActive Publication Date: 2019-11-08CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2019-11-08

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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.
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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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