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Thin films of Sn–Cu alloys with various compositions were prepared by annealing tin-coated copper foils at 463K for 0–45h. 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 363K. A Sn–Cu film annealed for 4h exhibited a stable reversible capacity of...
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