Journal
ELECTROCHIMICA ACTA
Volume 135, Issue -, Pages 60-67Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.04.159
Keywords
Sodium secondary battery; Ionic liquid; Sn-Cu alloy; Negative electrode; Cyclability
Categories
Funding
- Advanced Low Carbon Technology Research and Development Program (ALCA) of Japan Science and Technology Agency (JST)
- MEXT program Elements Strategy Initiative to Form Core Research Center, MEXT
- Ministry of Education Culture, Sports, Science and Technology, Japan
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Thin films of Sn-Cu alloys with various compositions were prepared by annealing tin-coated copper foils at 463 K for 0-45 h. Their charge-discharge behaviors as negative electrodes for sodium secondary batteries were investigated using an inorganic ionic liquid electrolyte, i.e., NaFSA-KFSA (FSA=bis(fluorosulfonyl)amide), at 363 K. A Sn-Cu film annealed for 4 h exhibited a stable reversible capacity of approximately 100 mAh (g-Sn)(-1). The improvement in the cyclability is discussed based on X-ray diffraction, X-ray photoelectron spectroscopy, and field-emission scanning electron microscopy results. (C) 2014 Elsevier Ltd. All rights reserved.
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