An Endogenous Prompting Mechanism for Sulfur Conversions Via Coupling with Polysulfides in Li−S Batteries

Author:

Zheng Qingyi1,Hou Qing1,Shu Zhenghao1,Liu Guoqing1,Fan Xiaoxiang1,Wang Kun1,Fan Jingmin1,Yuan Ruming1,Zheng Mingsen12,Dong Quanfeng12ORCID

Affiliation:

1. Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen Fujian 361005 China

2. Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) Xiamen 361005 China

Abstract

AbstractThe sluggish kinetics process and shuttling of soluble intermediates present in complex conversion between sulfur and lithium sulfide severely limit the practical application of lithium‐sulfur batteries. Herein, by introducing a designated functional organic molecule to couple with polysulfide intermediators, an endogenous prompting mechanism of sulfur conversions has thus been created leading to an alternative sulfur‐electrode process, in another words, to build a fast “internal cycle” of promotors that can promote the slow “external cycle” of sulfur conversions. The coupling‐intermediators between the functional organic molecule and polysulfides, organophosphorus polysulfides, to be the “promotors” for sulfur conversions, are not only insoluble in the electrolyte but also with higher redox‐activity. So the sulfur‐electrode process kinetics is greatly improved and the shuttle effect is eliminated simultaneously by this strategy. Meanwhile, with the endogenous prompting mechanism, the morphology of the final discharge product can be modified into a uniform covering film, which is more conducive to its decomposition when charging. Benefiting from the effective mediation of reaction kinetics and control of intermediates solubility, the lithium‐sulfur batteries can act out excellent rate performance and cycling stability.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Medicine

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