A facile in situ synthesis of nanocrystal-FeSi-embedded Si/SiO<inf>x</inf> anode for long-cycle-life lithium ion batteries

He, W; Liang, Y; Tian, H; Zhang, S; Meng, Z; Han, WQ

A facile in situ synthesis of nanocrystal-FeSi-embedded Si/SiO<inf>x</inf> anode for long-cycle-life lithium ion batteries

He, W Liang, Y Tian, H

Zhang, S Meng, Z Han, WQ

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Publication Type:: Journal Article
Citation:: Energy Storage Materials, 2017, 8 pp. 119 - 126
Issue Date:: 2017-07-01

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Field	Value	Language
dc.contributor.author	He, W	en_US
dc.contributor.author	Liang, Y	en_US
dc.contributor.author	Tian, H https://orcid.org/0000-0002-3622-129X	en_US
dc.contributor.author	Zhang, S	en_US
dc.contributor.author	Meng, Z	en_US
dc.contributor.author	Han, WQ	en_US
dc.date.available	2020-05-25T19:05:57Z
dc.date.issued	2017-07-01	en_US
dc.identifier.citation	Energy Storage Materials, 2017, 8 pp. 119 - 126	en_US
dc.identifier.uri	http://hdl.handle.net/10453/123484
dc.description.abstract	© 2017 Elsevier B.V. A cost-effective, environmentally friendly and industrialized method of using low-grade sources to prepare high-performance anode material for lithium ion batteries (LIBs) with high energy density and long cycle life is both appealing and challenging. Herein, we present a low-cost, scalable and controllable approach for preparing unique sub-micrometer core-shell structure nanocrystal-FeSi-embedded Si/SiOx (FSO) anode material directly from a low-grade Fe-Si alloy. The sub-micrometer FSO anode materials are controlled by in-situ reaction of the Fe-Si-O in the Fe-Si alloy according to the phase diagram. The XRD and Rietveld refinement results indicate that when the treatment temperature increase, (i) FeSi phase appears together with Si and FeSi2, and then (ii) Fe3Si phase appears together with Si and FeSi. Most importantly, benefited from the formation of the amorphous SiOx as buffer layer and self-conductive nanocrystal-FeSi as a robust skeleton to mechanically support the large volume change of Si during cycling, the sub-micrometer core-shell structure FSO anode exhibits a high capacity (931.3 mA h g−1) at 50 mA g−1 and a prolonged cycle performance with 86% capacity retention over 1000 cycles at 1 A g−1. The full cell with prelithiated FSO as the anode and commercial LiCoO2 as the cathode delivers a high energy density of 467.5 W h kg−1 at the 0.05 C. This work provides a promising route for commercial production of high-performance Si/SiOx-based anode materials in LIBs.	en_US
dc.relation.ispartof	Energy Storage Materials	en_US
dc.relation.isbasedon	10.1016/j.ensm.2017.05.003	en_US
dc.title	A facile in situ synthesis of nanocrystal-FeSi-embedded Si/SiO<inf>x</inf> anode for long-cycle-life lithium ion batteries	en_US
dc.type	Journal Article
utslib.citation.volume	8	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
utslib.for	0904 Chemical Engineering	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	8	en_US

Abstract:

© 2017 Elsevier B.V. A cost-effective, environmentally friendly and industrialized method of using low-grade sources to prepare high-performance anode material for lithium ion batteries (LIBs) with high energy density and long cycle life is both appealing and challenging. Herein, we present a low-cost, scalable and controllable approach for preparing unique sub-micrometer core-shell structure nanocrystal-FeSi-embedded Si/SiOx (FSO) anode material directly from a low-grade Fe-Si alloy. The sub-micrometer FSO anode materials are controlled by in-situ reaction of the Fe-Si-O in the Fe-Si alloy according to the phase diagram. The XRD and Rietveld refinement results indicate that when the treatment temperature increase, (i) FeSi phase appears together with Si and FeSi2, and then (ii) Fe3Si phase appears together with Si and FeSi. Most importantly, benefited from the formation of the amorphous SiOx as buffer layer and self-conductive nanocrystal-FeSi as a robust skeleton to mechanically support the large volume change of Si during cycling, the sub-micrometer core-shell structure FSO anode exhibits a high capacity (931.3 mA h g−1) at 50 mA g−1 and a prolonged cycle performance with 86% capacity retention over 1000 cycles at 1 A g−1. The full cell with prelithiated FSO as the anode and commercial LiCoO2 as the cathode delivers a high energy density of 467.5 W h kg−1 at the 0.05 C. This work provides a promising route for commercial production of high-performance Si/SiOx-based anode materials in LIBs.

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http://hdl.handle.net/10453/123484