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Optimized Catalytic WS 2 –WO 3 Heterostructure Design for Accelerated Polysulfide Conversion in Lithium–Sulfur Batteries
Author(s) -
Zhang Bin,
Luo Chong,
Deng Yaqian,
Huang Zhijia,
Zhou Guangmin,
Lv Wei,
He YanBing,
Wan Ying,
Kang Feiyu,
Yang QuanHong
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202000091
Subject(s) - polysulfide , materials science , heterojunction , battery (electricity) , catalysis , sulfur , chemical engineering , lithium (medication) , lithium–sulfur battery , rational design , oxide , cathode , sulfide , nanotechnology , electrode , optoelectronics , chemistry , metallurgy , electrolyte , organic chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
The lithium–sulfur (Li–S) battery is a next generation high energy density battery, but its practical application is hindered by the poor cycling stability derived from the severe shuttling of lithium polysulfides (LiPSs). Catalysis is a promising way to solve this problem, but the rational design of relevant catalysts is still hard to achieve. This paper reports the WS 2 –WO 3 heterostructures prepared by in situ sulfurization of WO 3 , and by controlling the sulfurization degree, the structure is controlled, which balances the trapping ability (by WO 3 ) and catalytic activity (by WS 2 ) toward LiPSs. As a result, the WS 2 –WO 3 heterostructures effectively accelerate LiPS conversion and improve sulfur utilization. The Li–S battery with 5 wt% WS 2 –WO 3 heterostructures as additives in the cathode shows an excellent rate performance and good cycling stability, revealing a 0.06% capacity decay each cycle over 500 cycles at 0.5 C. By building an interlayer with such heterostructure‐added graphenes, the battery with a high sulfur loading of 5 mg cm −2 still shows a high capacity retention of 86.1% after 300 cycles at 0.5 C. This work provides a rational way to prepare the metal oxide–sulfide heterostructures with an optimized structure to enhance the performance of Li–S batteries.