Promoting polysulfides redox conversion by sulfur-deficient ZnS1−x hollow polyhedrons for lithium-sulfur batteries
Gao W. Jin Q. Liu Y. Zhang Y. Wang X. Bakenov Z.
15 November 2021Elsevier Ltd
Materials and Design
2021#210
Lithium-sulfur (Li-S) batteries are deemed as the attractive systems for high-energy storage. However, the polysulfides shuttling with slow redox kinetics has seriously hindered their practical applications. Herein, sulfur-deficient zinc sulfide (ZnS1−x) hollow polyhedrons are synthesized as the multifunctional sulfur host material via the sulfurization and high-temperature annealing method. The unique hollow structure could supply adequate void spaces for sulfur loading and alleviate volumetric expansion of sulfur upon the cycling process. Besides, ZnS1−x hollow polyhedrons with abundant sulfur vacancies can provide effective adsorption sites to chemically immobilize polysulfides and enhance polysulfides redox conversion as confirmed by theoretical calculation results and electrocatalytical experiments. Thus, the S/ZnS1−x cathode delivers the remarkable initial capacity (1206 mAh g−1 at 0.2 C) and excellent cycling stability (592 mAh g−1 after 500 cycles at 1 C). The study points out the idea of functional cathode material for Li-S batteries based on a simple yet efficient vacancy engineering method.
Hollow structure , Lithium-sulfur battery , Polysulfides redox conversion , Sulfur host , Sulfur-deficient
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School of Materials Science and Engineering, State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin, 300130, China
South China Academy of Advanced Optoelectronics & International Academy of Optoelectronics at Zhaoqing, South China Normal University, Guangzhou, 510006, China
Department of Chemical and Materials Engineering, National Laboratory Astana, Nazarbayev University, Institute of Batteries LLP, Nur-Sultan, 010000, Kazakhstan
School of Materials Science and Engineering
South China Academy of Advanced Optoelectronics & International Academy of Optoelectronics at Zhaoqing
Department of Chemical and Materials Engineering
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