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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (23): 2715-2719. 上一篇    下一篇

研究论文

脉冲激光沉积法制备FeSe薄膜电极及其电化学性质

薛明喆, 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 上海 200433)
  • 投稿日期:2006-07-04 修回日期:2007-10-29 发布日期:2007-12-14
  • 通讯作者: 正文

Electrochemical Properties of FeSe Thin Film Electrode Fabricated by Pulsed Laser Deposition

XUE Ming-Zhe; FU Zheng-Wen   

  1. (Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Department of Chemistry & Laser Chemistry Institute, Fudan University, Shanghai 200433)
  • Received:2006-07-04 Revised:2007-10-29 Published:2007-12-14
  • Contact: FU Zheng-Wen

PDF

962

被引次数

8

采用脉冲激光溅射Fe和Se粉末的混合靶制备FeSe薄膜并用XRD、充放电和循环伏安测试研究了薄膜的结构和电化学性质. XRD结果显示, 当基片温度为200 ℃时, 薄膜主要由晶态的FeSe组成. 在电压1.0～3.0 V范围内, 该薄膜的可逆容量为360.8 mAh•g－1, 经过100次循环之后的放电容量为396.5 mAh•g－1, 具有很好的循环性能. ex situ XRD结果显示FeSe能够和Li发生可逆的电化学反应, 颗粒尺寸大于5 nm的纳米铁颗粒能够驱动Li2Se的分解并在充电过程中重新生成FeSe. FeSe具有较高的可逆容量和较好的循环性能, 可能成为一种优良的锂二次电池正极材料.

关键词: FeSe, 脉冲激光沉积, 薄膜, 电化学

FeSe thin film has been successfully fabricated by pulsed laser ablation of mixed target of Fe and Se powder. The structural and electrochemical properties of the as-deposited thin films have been investigated by X-ray diffraction (XRD), the charge/discharge and cyclic voltammetry (CV) measurements. The thin film deposited at 200 ℃ was mainly composed of crystallized FeSe. In the range of 1.0～3.0 V, the reversible discharge capacities was 360.8 mAh•g－1. After 100 cycles, the discharge capacity was 396.5 mAh• g－1, indicating a stable cycle performance. Ex situ XRD results showed that FeSe could react with Li reversibly. Nanosized metal iron whose crystal size was more than 5 nm could also drive the decomposition of Li2Se and reform FeSe after charging to 3.0 V. Owing to its high reversible capacity and good cycle ability, FeSe was demonstrated to be a promising cathode material for future rechargeable lithium batteries.

Key words: FeSe, pulsed laser deposition, thin film, electrochemistry