物理化学学报 >> 2008, Vol. 24 >> Issue (07): 1287-1291.doi: 10.3866/PKU.WHXB20080728

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脉冲激光沉积CuF2薄膜的电化学性能

张华; 周永宁; 吴晓京; 傅正文   

  1. 复旦大学化学系激光化学研究所, 上海市分子催化和功能材料重点实验室; 复旦大学材料科学系, 上海 200433
  • 收稿日期:2008-01-18 修回日期:2008-04-02 发布日期:2008-07-04
  • 通讯作者: 傅正文 E-mail:zhengwen@sh163.net

Electrochemical Properties of CuF2 Films Fabricated by Pulsed Laser Deposition

ZHANG Hua; ZHOU Yong-Ning; WU Xiao-Jing; FU Zheng-Wen   

  1. Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Institute of Laser Chemistry, Department of Chemistry, Fudan University; Department of Material Science, Fudan University, Shanghai 200433, P. R. China
  • Received:2008-01-18 Revised:2008-04-02 Published:2008-07-04
  • Contact: FU Zheng-Wen E-mail:zhengwen@sh163.net

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摘要： 采用脉冲激光沉积法在不锈钢基片上制备了纳米结构的CuF2薄膜, 其充放电性能显示该薄膜具有540 mAh·g-1可逆容量, 对应于每个CuF2可与2.0个Li发生反应. 其循环伏安特性显示在2.2和2.8 V (vs Li/Li+)处出现了一对新的氧化还原峰. 充放电后薄膜的组成与结构通过非原位高分辨电子显微和选区电子衍射来表征. 结果揭示了纳米结构CuF2薄膜的电化学反应机理, LiF在过渡金属Cu的驱动下可以发生可逆的分解和形成.

关键词: CuF2, 薄膜, 脉冲激光沉积, 锂离子电池

Abstract: Nanostructured CuF2 thin films were prepared by pulsed laser deposition on stainless steel substrates. The charge and discharge curves showed a high reversible capacity of 540 mAh·g-1, corresponding to 2.0 Li per CuF2. The cyclic voltammograms showed that a new couple of reduction and oxidation peaks at 2.2 and 2.8 V (vs Li/Li+) appeared for the first time. The components and structure of the films after charging and discharging were characterized by ex-situ high-resolution transmission electron microscopy and selected area electron diffraction measurements. Electrochemical reaction mechanism of nanostructured CuF2 thin films with lithium was revealed, in which the reversible decomposition and formation of LiF driven by transition metal Cu were involved.

Key words: CuF2, Thin film, Pulsed laser deposition, Lithiumion battery

MSC2000: 

  • O646.2