期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 21, 期 -, 页码 65-68出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2012.05.017
关键词
Na-ion battery; Tin; Alloy
资金
- JSPS [21750194]
- Human Resources Development of the KETEP
- Korea government Ministry of Knowledge Economy [20114010203150]
- Grants-in-Aid for Scientific Research [21750194] Funding Source: KAKEN
Sn powder electrodes with polyacrylate binder are examined in aprotic Na cells. The Sn electrodes demonstrate electrochemical redox reaction to reversibly form Sn-Na intermetallic phases, such as Na15Sn4 in the voltage region between 0.0 and 0.7 V vs. Na whereas Si, Ge, and Pb electrodes show less or no specific capacity in Na cells. The reversibility of the Sn electrodes is improved by polyacrylate as a binder and restriction of potential range between 0.0 and 0.8 V. When fluoroethylene carbonate is added to propylene carbonate solution containing NaClO4, the Sn electrode performance with polyacrylate is further improved. The Sn electrode delivers ca. 500 mAh g(-1) for more than 20 cycles, which is about two times larger reversible capacity compared with a hard-carbon negative electrode for Na-ion batteries. (C) 2012 Elsevier B.V. All rights reserved.
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