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Title: Cobalt sulfide nanoflakes grown on graphite foam for Na-ion batteries with ultrahigh initial coulombic efficiency
Authors: Wang, Haisheng
Liu, Jilei
Wang, Huanhuan
Cai, Xiaoyi
Ye, Xinli
Zhang, Lili
Chen, Zhen
Shen, Ze Xiang
Keywords: Engineering::Materials
Issue Date: 2020
Source: Wang, H., Liu, J., Wang, H., Cai, X., Ye, X., Zhang, L., ... Shen, Z. X. (2020). Cobalt sulfide nanoflakes grown on graphite foam for Na-ion batteries with ultrahigh initial coulombic efficiency. Journal of Materials Chemistry A, 8(30), 14900–14907. doi:10.1039/D0TA04312E
Journal: Journal of Materials Chemistry A 
Abstract: Sodium-ion batteries (SIBs) are regarded as promising low-cost alternatives to the prevailing lithium-ion batteries. However, most anode materials for SIBs suffer from low initial coulombic efficiency (ICE), limiting their commercial applications. Herein, we demonstrate a Na-ion anode with an extremely high ICE of 99.4%, based on cobalt sulfide (Co9S8/CoS) nanoflakes grown on graphite foam (GF) in a diglyme-based electrolyte. The achievement of such a high ICE can be ascribed to the following three aspects: (i) negligible side reactions between a diglyme-based electrolyte and Co9S8/CoS, owing to a much higher Fermi level of diglyme reduction than anode potential μA of Co9S8/CoS, which can block electron transfer from the anode to the electrolyte, (ii) highly reversible conversion reaction of Co9S8/CoS, and (iii) much lower initial capacity loss of substrate GF, compared with other sorts of carbon. The underlying rules revealed in this study serve as general guidelines in the development of sodium-ion anodes to achieve superb ICE.
ISSN: 2050-7488
DOI: 10.1039/D0TA04312E
Rights: © 2020 The Royal Society of Chemistry. All rights reserved. This paper was published in Journal of Materials Chemistry A and is made available with permission of The Royal Society of Chemistry.
Fulltext Permission: embargo_20210627
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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