Lithium-sulfur battery electrolyte containing multifunctional additive and application thereof

A lithium-sulfur battery and electrolyte technology, applied in the field of high specific energy secondary batteries, can solve the problems of polysulfide instability in the multi-electron conversion mechanism, and achieve the effects of avoiding rapid consumption, reducing loss, and changing deposition morphology

Active Publication Date: 2020-02-28
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complexity of the multi-electron conversion mechanism and the instability of polysulfides, the development of lithium-sulfur electrolytes faces great challenges.

Method used

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  • Lithium-sulfur battery electrolyte containing multifunctional additive and application thereof
  • Lithium-sulfur battery electrolyte containing multifunctional additive and application thereof
  • Lithium-sulfur battery electrolyte containing multifunctional additive and application thereof

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Embodiment

[0031] Electrolyte configuration: in a glove box filled with argon (O 2 , H 2 O content <0.1ppm), ethylene glycol dimethyl ether (DME), 1,3-dioxane (DOL), diethylene glycol dimethyl ether (G2), triethylene glycol dimethyl ether ( G3), tetraethylene glycol dimethyl ether (G4), tetrahydrofuran (THF), dimethyl sulfoxide (DMSO), dimethyl trisulfide (DMTS) in a mixture of two or more as an organic solvent . Add 0.1-5% of the total mass of the electrolyte as an auxiliary additive, add 5-80% of the total volume of the electrolyte as a multifunctional additive, add lithium salt, and make the concentration of the lithium salt in the electrolyte 1.0mol / L (M), Stir well and evenly to obtain the lithium-sulfur battery electrolyte.

[0032] In an argon atmosphere, a metal lithium sheet was used as the negative electrode, a polypropylene microporous membrane of model Celgard 2400 was used as the separator, and the electrolyte dosage was 15 μL / mg S, and a CR2025 lithium-sulfur battery was...

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Abstract

The invention discloses a lithium-sulfur battery electrolyte containing a multifunctional additive and an application thereof, which belongs to the technical field of rechargeable and dischargeable high-specific-energy secondary batteries. The electrolyte comprises an organic solvent, a lithium salt and a multifunctional additive. The multifunctional additive is one or more of compounds with R1-O-R2 chemical structural formulas. R1 and R2 are the same or different, and R1 or R2 is selected from a C1-C8 alkane group, a C2-C8 alkenyl group, a C3-C8 cycloalkyl group, a C3-C8 hetero-cycloalkyl group or a partially unsaturated C3-C8 cyclic hydrocarbon group. The ring structure of the C3-C8 cycloalkyl group, the C3-C8 hetero-cycloalkyl group or the partially unsaturated C3-C8 cyclic hydrocarbongroup contains or does not contain a substituent. By introducing the multifunctional ether additive, the loss of active substances sulfur and lithium is reduced, the cycling stability of the battery is enhanced, the chemical reaction between polysulfide in the electrolyte and metal lithium is inhibited, and the coulombic efficiency of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of rechargeable high specific energy secondary batteries, in particular to a lithium-sulfur battery electrolyte containing multifunctional additives and its application. Background technique [0002] With the continuous development of new energy technologies, especially with the urgent demand for high energy density secondary batteries in the field of intelligent communication equipment and electric vehicles. The research on high energy density energy storage and conversion devices has practical significance. Compared with traditional lithium-ion batteries that rely on the intercalation and extraction of lithium ions for energy storage, from the electrochemical point of view, the multi-electron reaction material system is the basis for constructing high specific energy secondary batteries. Among them, lithium-sulfur batteries have become the key research objects of the next generation of new lithium seconda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/052H01M10/0567H01M2300/0025Y02E60/10
Inventor 张强张学强金奇
Owner TSINGHUA UNIV
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