Electrochemical characteristics of Sn film prepared by pulse electrode position method as negative electrode for lithium secondary batteries

JOURNAL OF POWER SOURCES

卷:189

Article; Proceedings Paper

Ui, Koichi¹  Kikuchi, Shinei¹  Kadoma, Yoshihiro¹  Kumagai, Naoaki¹  Ito, Shigeru² 

[1] Iwate Univ, Grad Sch Engn, Dept Frontier Mat & Funct Engn, Morioka, Iwate 0208551, Japan

[2] Tokyo Univ Sci, Fac Sci & Technol, Chiba 2788510, Japan

关键词: Lithium secondary battery;    Negative electrode;    Tin;    Pulse electrodeposition;    GD-OES;   

DOI  :  10.1016/j.jpowsour.2008.09.081

来源: Elsevier

【 摘 要 】

In order to improve the cyclability of Sn negative electrode, we tried preparing the Sn film negative electrode by a pulse electrodeposition. Based on the SEM observations, the crystal grains of the Sn film after the pulse electrodeposition were comparatively homogeneous and their grain size was ca. 1 mu m. The discharge capacity and the charge-discharge efficiency at the 1st cycle were 679.3 mAh g(-1) and 93.0%, respectively. The charge-discharge tests indicated that the initial electrochemical characteristic of Sn film electrode prepared by a pulse electrodeposition was much better than that of the Sn film electrode prepared by a constant current electrodeposition. The GD-OES profile suggested that Li+ ions were easily extracted during the discharge reaction. In addition, it was found that no exfoliation of the film was observed after the 1st discharge though the cracking in the film was observed after the 1st discharge. Consequently. the Sn film electrode prepared by a pulse electrodeposition exhibited a better cyclability for the initial 10 cycles compared to the Sn film electrode prepared by a constant current electrodeposition. By reducing the particle size and repressing the morphological change, the initial electrochemical characteristics were considerably improved. (C) 2008 Elsevier B.V. All rights reserved.

【 授权许可】

Free