Lithium-sulfur battery electrolyte containing multifunctional additive and application thereof

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...

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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.

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