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Nanoparticle Assembled Mesoporous MoO 2 Microrods Derived from Metal Organic Framework and Wrapped with Graphene as the Sulfur Host for Long‐Life Lithium–Sulfur Batteries
Author(s) -
Razaq Rameez,
Sun Dan,
Xin Ying,
Li Qian,
Huang Taizhong,
Zhang Zhaoliang,
Huang Yunhui
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201801636
Subject(s) - materials science , mesoporous material , graphene , sulfur , lithium (medication) , nanoparticle , chemical engineering , cathode , dissolution , electrochemistry , nanotechnology , conductivity , electrode , catalysis , inorganic chemistry , chemistry , organic chemistry , metallurgy , engineering , medicine , endocrinology
Lithium–sulfur (Li–S) batteries are highly potential for next‐generation electrochemical energy storage due to their high energy density. However, low conductivity of the sulfur cathode, dissolution, and poor conversion kinetics of lithium polysulfides (LiPSs) are the key challenges. Herein crispy rice‐like nanoparticle assembled mesoporous MoO 2 microrods derived from metal organic frameworks and wrapped with graphene (MoO 2 /rGO) are fabricated, exhibiting high electron and lithium ion conductivity from the inherent metallic conductivity for MoO 2 and mesoporous‐structural microrod morphology, physical confinement for LiPSs through mesopores, chemical adsorption, and catalytic conversion of LiPSs by formation of thiosulfates (polythionates) due to moderate redox potential for MoO 2 . The S‐MoO 2 /rGO cathode shows a discharge capacity of 1145 mAh g −1 at 0.5C and keeps at 1027 mAh g −1 after 500 cycles, corresponding to an average capacity decay rate of 0.02% per cycle. Specifically, an ultralong cycling life with a low capacity decay of 0.016% only over 3200 cycles at 3.0C is the best performance in long‐life Li–S batteries among reported sulfur hosts.