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Directly deposited antimony on a copper silicide nanowire array as a high-performance potassium-ion battery anode with a long cycle life
Date
2022
Abstract
Antimony (Sb) is a promising anode material for potassium-ion batteries (PIBs) due to its high capacity and moderate working potential. Achieving stable electrochemical performance for Sb is hindered by the enormous volume variation that occurs during cycling, causing a significant loss of the active material and disconnection from conventional current collectors (CCs). Herein, the direct growth of a highly dense copper silicide (Cu15Si4) nanowire (NW) array from a Cu mesh substrate to form a 3D CC is reported that facilitates the direct deposition of Sb in a core-shell arrangement (Sb@Cu15Si4 NWs). The 3D Cu15Si4 NW array provides a strong anchoring effect for Sb, while the spaces between the NWs act as a buffer zone for Sb expansion/contraction during K–cycling. The binder-free Sb@Cu15Si4 anode displays a stable capacity of 250.2 mAh g−1 at 200 mA g−1 for over 1250 cycles with a capacity drop of ≈0.028% per cycle. Ex situ electron microscopy revealed that the stable performance is due to the complete restructuring of the Sb shell into a porous interconnected network of mechanically robust ligaments. Notably, the 3D Cu15Si4 NW CC is expected to be widely applicable for the development of alloying-type anodes for next-generation energy storage devices.
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Description
Publisher
Wiley and Sons
Citation
Advanced Functional Materials, 33, 2209566
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Imtiaz_2022_Directly.pdf
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Funding Information
K.M.R. acknowledges Science Foundation Ireland (SFI) under the Principal Investigator Program under contract no. 16/IA/4629 and under grant no. SFI 16/M-ERA/3419 and European Union’s Horizon 2020 Research and Innovation Program under grant agreement no. 814464 (Si-DRIVE project). K.M.R further acknowledges IRCLA/2017/285 and SFI Research Centers MaREI, AMBER, and CONFIRM 12/RC/2278_P2, 12/RC/2302_P2, and 16/RC/3918. T.K. acknowledges support from the Sustainable Energy Authority of Ireland through the Research Development and Demonstration Funding Program (grant no. 19/RDD/548) and from Enterprise Ireland through the Innovation Partnership Program (grant no. IP 2019 0910). T.K. further acknowledges support from the SFI Research Centres MaREI (award reference no. 12/RC/2302_P2) and AMBER (award reference no. 12/RC/2278_P2). H.G. acknowledges SIRG under grant 18/SIRG/5484.Open access funding provided by IReL
Sustainable Development Goals
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Type
Article
Rights
https://creativecommons.org/licenses/by-nc-sa/4.0/