Electrolyte capable of inhibiting shuttle effect of lithium-sulfur battery and preparation method and application of electrolyte

Abstract

The invention relates to the technical field of lithium-sulfur batteries, and particularly discloses an electrolyte capable of inhibiting a shuttle effect of a lithium-sulfur battery and a preparation method and application of the electrolyte. A homogeneous catalyst is dissolved in the electrolyte, the homogeneous catalyst contains cyclopentadienyl, and the homogeneous catalyst comprises at least one of ruthenium dicyclopentadienyl, cobalt dicyclopentadienyl and chromium dicyclopentadienyl. According to the invention, the homogeneous catalyst containing cyclopentadienyl is dissolved in the electrolyte and shows better cycle performance and rate capability when being used as the electrolyte of the lithium-sulfur battery because the homogeneous catalyst with the characteristics can be ionized to form a negatively charged cyclopentadienyl ligand after being dissolved, pi electron-cation charge interaction exists between Li<+> in lithium polysulfide and the negatively charged cyclopentadienyl ligand, lithium polysulfide can be captured, meanwhile, the reaction is carried out on a homogeneous interface, so that the reaction is more efficient and rapid, the shuttle effect inhibition effect is finally achieved, and better cycle performance and rate performance are achieved.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to an electrolyte capable of suppressing the shuttle effect of lithium-sulfur batteries, a preparation method and application thereof. Background technique [0002] The information disclosed in this Background section is intended to enhance the understanding of the general background of the invention, and it is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those of ordinary skill in the art. [0003] With the popularity of wearable electronic devices and electric vehicles, the existing lithium-ion batteries have been difficult to meet people's demand for high energy density and low-cost batteries. Lithium-sulfur batteries have much higher energy density than lithium-ion batteries (~2600Wh g -1 ), lower cost, and a good environment have gradually attracted widespread...

AI Technical Summary

Problems solved by technology

However, it is worth noting that for this heterogeneous catalytic material, the catalytic conversion of lithium polysulfides often only occurs on a limited accessible surface, and the slow diffusion of lithium polysulfides to its surface will also limit its reaction rate, so for For heterogeneous catalysts, even if the material itself has high catalytic activity, its utilization rate is difficult to reach a high level.

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