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Stable Lithium Sulfur Battery Based on In Situ Electrocatalytically Formed Li 2 S on Metallic MoS 2 –Carbon Cloth Support
Author(s) -
Wang Mingshan,
Yang Hua,
Shen Kangqi,
Xu Hao,
Wang Wenjie,
Yang Zhenliang,
Zhang Lei,
Chen Junchen,
Huang Yun,
Chen Mingyang,
Mitlin David,
Li Xing
Publication year - 2020
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.202000353
Subject(s) - polysulfide , electrolyte , anode , battery (electricity) , lithium (medication) , cathode , molybdenum disulfide , carbon fibers , electrode , lithium–sulfur battery , materials science , sulfur , metal , molybdenum , chemistry , adsorption , chemical engineering , inorganic chemistry , metallurgy , composite material , medicine , power (physics) , physics , quantum mechanics , composite number , engineering , endocrinology
A stable lean‐electrolyte operating lithium–sulfur (Li–S) battery based on a cathode of Li 2 S in situ electrocatalytically deposited from L 2 S 8 catholyte onto a support of metallic molybdenum disulfide (1T‐MoS 2 ) on carbon cloth (CC) is created. The 1T‐MoS 2 significantly accelerates the conversion Li 2 S 8 catholyte to Li 2 S, chemically adsorbs lithium polysulfide (LiPSs) from solution, and suppresses crossover of the LiPSs to the anode. These experimental findings are explained by density functional theory calculations that show that 1T‐MoS 2 gives rise to strong adsorption of polysulfides on its surface and is electrocatalytic for the targeted reversible Li–S conversion reactions. The CC/1T‐MoS 2 electrode in a Li–S battery delivers an initial capacity of 1238 mAh g −1 , with a low capacity fade of only 0.051% per cycle over 500 cycles at 0.5 C . Even at a high sulfur loading (4.4 mg cm −2 ) and low electrolyte/S (E/S) ratio of 3.7 µL mg −1 , the battery achieves an initial reversible capacity of 1176 mA h g −1 at 0.5 C , with 87% capacity retention after 160 cycles. The post 500 cycles Li metal opposing 1T‐MoS 2 is substantially smoother than the Li opposing CC, with XPS supporting the role of 1T‐MoS 2 in inhibiting LiPSs crossover.