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Type: Journal article
Title: Long-life room-temperature sodium–sulfur batteries by virtue of transition-metal-nanocluster–sulfur interactions
Author: Zhang, B.-W.
Sheng, T.
Wang, Y.-X.
Chou, S.
Davey, K.
Dou, S.-X.
Qiao, S.-Z.
Citation: Angewandte Chemie International Edition, 2019; 58(5):1484-1488
Publisher: Wiley Online Library
Issue Date: 2019
ISSN: 1433-7851
Statement of
Bin‐Wei Zhang, Tian Sheng, Yun‐Xiao Wang, Shulei Chou, Kenneth Davey, Shi‐Xue Dou, Shi‐Zhang Qiao
Abstract: Room-temperature sodium-sulfur (RT-Na/S) batteries hold significant promise for large-scale application because of low cost of both sodium and sulfur. However, the dissolution of polysulfides into the electrolyte limits practical application. Now, the design and testing of a new class of sulfur hosts as transition-metal (Fe, Cu, and Ni) nanoclusters (ca. 1.2 nm) wreathed on hollow carbon nanospheres (S@M-HC) for RT-Na/S batteries is reported. A chemical couple between the metal nanoclusters and sulfur is hypothesized to assist in immobilization of sulfur and to enhance conductivity and activity. S@Fe-HC exhibited an unprecedented reversible capacity of 394 mAh g-1 despite 1000 cycles at 100 mA g-1 , together with a rate capability of 220 mAh g-1 at a high current density of 5 A g-1 . DFT calculations underscore that these metal nanoclusters serve as electrocatalysts to rapidly reduce Na2 S4 into short-chain sulfides and thereby obviate the shuttle effect.
Keywords: Na/S batteries
metal nanoclusters
shuttle effect
Rights: © 2019 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/anie.201811080
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