Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 714, Issue -, Pages 348-355Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.04.240
Keywords
Sodium-ion battery; Thin film; Pulsed laser deposition; Alloy-type anode; Solid electrolyte interface
Categories
Funding
- NSFC [51502039]
- 1000 Youth Talents Plan of China [D1210005]
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Tin-antimony/phosphorus nanocomposite thin films have been successfully prepared by pulsed laser deposition and are studied as anode materials for sodium ion batteries. The thin films exhibit a specific capacity of about 252 mAh g(-1) over 100 cycles at a rate of 250 mA g(-1), which is much higher than those for tin-antimony alloy, antimony or tin thin films. The improved electrochemical performance is attributed to the introduced phosphorus, which plays a key role in forming a stable solid electrolyte interface layer, thus enhances the reversibility. Phase separation is revealed after the initial cycle by forming the metallic tin and antimony nanoparticles. In addition, introducing phosphorus into tinantimony alloy film can reduce the interfacial resistance between the electrode and electrolyte, as well as facilitate sodium-ion diffusion in the electrode. (C) 2017 Elsevier B.V. All rights reserved.
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