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A New Finding on the Enhancement of the Ability of Polysulfide Adsorption of V 2 O 5 by Doping Tungsten in Lithium–Sulfur Batteries
Author(s) -
Gao Feng,
Yan Xinxiu,
Li Xuan,
Qiao Yingjun,
Shang Huimin,
Zhang Yanhua,
Fan Weifeng
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900405
Subject(s) - polysulfide , faraday efficiency , materials science , electrolyte , tungsten , cathode , sulfur , separator (oil production) , chemical engineering , lithium (medication) , adsorption , doping , inorganic chemistry , conductivity , graphene , nanotechnology , electrode , chemistry , metallurgy , organic chemistry , medicine , physics , optoelectronics , engineering , endocrinology , thermodynamics
Lithium–sulfur batteries are considered to be the most commercially promising lithium metal secondary batteries due to their high specific capacity. However, the shuttle effect of lithium polysulfide (LiPS) in the electrolyte seriously hinders the development of lithium–sulfur batteries. W‐doped V 2 O 5 (W‐V 2 O 5 ) is prepared by a hydrothermal method, which greatly improves the LiPS adsorption ability of V 2 O 5 . The W‐V 2 O 5 powder can discolor the LiPS solution in 1 min. Then, W‐V 2 O 5 is combined with a graphene/carbon nanotube composite (G/CNT) with good conductivity to modify the separator. As a result, the W‐V 2 O 5 ‐G/CNT‐coated separator allows the sulfur cathode to reach a high initial discharge capacity of 1200 mAh g −1 at 0.2 C and a reversible capacity of 815 mAh g −1 after 200 cycles at 0.5 C, and leads to an excellent rate ability (up to 2 C rate) and a high coulombic efficiency of 99.5%. This provides a new direction for designing efficient LiPS catalysts.