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TiO 2 Feather Duster as Effective Polysulfides Restrictor for Enhanced Electrochemical Kinetics in Lithium–Sulfur Batteries
Author(s) -
Lei Tianyu,
Xie Yiming,
Wang Xianfu,
Miao Shengyi,
Xiong Jie,
Yan Chenglin
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201701013
Subject(s) - polysulfide , electrochemistry , faraday efficiency , sulfur , materials science , battery (electricity) , lithium–sulfur battery , cathode , lithium (medication) , chemical engineering , dissolution , kinetics , electrochemical kinetics , electrode , nanotechnology , chemistry , electrolyte , medicine , power (physics) , physics , quantum mechanics , engineering , metallurgy , endocrinology
The rechargeable lithium–sulfur battery is recognized as a promising candidate for electrochemical energy storage system because of their exceptional advance in energy density. However, the fast capacity decay of sulfur cathode caused by polysulfide dissolution and low specific capacity caused by poor electrical conductivity still impede the further development of lithium–sulfur battery. To address above issues, this study reports the synthesis of feather duster‐like TiO 2 architecture by in situ growth of TiO 2 nanowires on carbon cloth and further evaluates as sulfur host material. The strong chemical binding interaction between the polysulfides and TiO 2 feather duster efficiently restrains the shuttle effect, leading to enhanced electrochemical kinetics. Besides, the in situ grown TiO 2 NWs array also supply high surface for sulfur‐loading and fast path for electron transfer and ion diffusion. As results, the novel CC/TiO 2 /S composite cathode exhibits a high capacity of 608 mA h g −1 at 1.0 C after 700 cycles corresponding to capacity decay as low as 0.045% per cycle with excellent Coulombic efficiency higher than 99.5%.