Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 69, Issue -, Pages 11-14Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2016.05.005
Keywords
Na-ion battery; Negative electrode material; Conversion material; Transition metal phosphide
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Funding
- ESICB-Kyoto University
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Iron phosphides, FeP2 and FeP4, have been synthesized and characterized for the application to non-aqueous Na-ion battery. FeP2 shows no significant electrochemical reactivity in Na-cell. However, FeP4 composite electrode with sodium polyacrylate binder delivers a reversible capacity of 1137 mAh.g(-1) and a Coulombic efficiency of 84.0% during the first cycle under a current density of 89 mA.g(-1). The high capacity is maintained for 30 cycles. Moreover, FeP4 composite electrode presents a good rate capability. Although the sodiation mechanism of FeP4 has not been fully understood, FeP4 is a new promising negative electrode material for Na-ion batteries with both high-power and high-energy densities. (C) 2016 Elsevier B.V. All rights reserved.
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