Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6606196 | Electrochimica Acta | 2016 | 11 Pages |
Abstract
Sn-Fe alloy thin films were prepared by electroplating of tin on iron substrates and annealing them at 533Â K for 0 to 25Â h. The charge-discharge behavior of the films as negative electrodes for sodium secondary batteries was evaluated using a Na[FSA]-K[FSA] (FSAÂ =Â bis(fluorosulfonyl)amide) ionic liquid at 363Â K. Although the Sn-Fe film without annealing (pure Sn film) showed a relatively high discharge capacity of 730Â mAh (g-Sn)â1 in the first cycle, its capacity rapidly decreased to 30Â mAh (g-Sn)â1 within 10 cycles. In contrast, Sn-Fe films annealed for 2 or 4Â h retained higher discharge capacities of 191 or 82Â mAh (g-Sn)â1 after 100 cycles, respectively, due to the formation of an FeSn2 alloy. Additionally, an FeSn2 film was prepared by removing the SnO layer of the Sn-Fe alloy film that was annealed for 25Â h, and its charge-discharge behavior was investigated.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Takayuki Yamamoto, Toshiyuki Nohira, Rika Hagiwara, Atsushi Fukunaga, Shoichiro Sakai, Koji Nitta,