Charge-discharge behavior of tin negative electrode for a sodium secondary battery using intermediate temperature ionic liquid sodium bis(fluorosulfonyl)amide-potassium bis(fluorosulfonyl)amide

详细信息    查看全文

• 作者：Takayuki Yamamoto ; Toshiyuki Nohira ; Rika Hagiwara ; Atsushi Fukunaga ; Shoichiro Sakai ; Koji Nitta ; Shinji Inazawa
• 关键词：Sodium secondary battery ; Intermediate temperature ; Ionic liquid ; Bis(fluorosulfonyl)amide ; Tin negative electrode ; Cycleability
• 刊名：Journal of Power Sources
• 出版年：2012
• 出版时间：1 November, 2012
• 年：2012
• 卷：217
• 期：Complete
• 页码：479-484
• 全文大小：476 K

文摘

The charge-discharge behavior of a Sn negative electrode for use in a sodium secondary battery was investigated in an intermediate temperature ionic liquid, NaFSA-KFSA (x_NaFSA?=?0.56, x_KFSA?=?0.44, FSA?=?bis(fluorosulfonyl)amides), at 363?K. A Na/Sn half-cell was prepared using a Sn-film (10-12?¦Ìm^t) electrode. The charge-discharge curves at 0.619?mA?cm^?2 with cut-off voltages of 0.005 and 1.200?V exhibited three potential plateaus in both the charging (alloying) and discharging (de-alloying) processes, indicating the formation of various alloy phases. Charge and discharge capacities as high as 790 and 729?mA?h (g-Sn)^?1, respectively, were obtained for the 1st cycle; however, the capacities decreased rapidly due to volume change during the alloying and de-alloying processes. The best cycleability was achieved when the lower and higher cut-off voltages were set to 0.005 and 0.200?V, respectively. In this case, a reversible capacity of about 300?mA?h (g-Sn)^?1 was obtained for the initial 15?cycles.