物理化学学报 >> 2006, Vol. 22 >> Issue (01): 65-70.doi: 10.3866/PKU.WHXB20060113

研究论文 上一篇    下一篇

Mn4N薄膜与锂的电化学反应性能

王颖; 刘文元; 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
  • 收稿日期:2005-05-16 修回日期:2005-08-20 发布日期:2006-01-15
  • 通讯作者: 傅正文 E-mail:zhengwen@sh163.net

Electrochemistry of Mn4N with Lithium

WANG Ying; LIU Wen-yuan; FU Zheng-wen   

  1. Shanghai Key Laboratory of Molecular Catalysts and Functional Materials, Department of Chemistry & Institute of Laser Chemistry, Fudan University, Shanghai 200433, P. R. China
  • Received:2005-05-16 Revised:2005-08-20 Published:2006-01-15
  • Contact: FU Zheng-wen E-mail:zhengwen@sh163.net

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摘要： 采用脉冲激光沉积辅助高压电离的方法在不锈钢基片上制备了Mn4N薄膜. 用充放电和循环伏安测试对该薄膜电极的电化学性能进行了表征. 该薄膜电极的首次放电容量为420 mAh•g-1, 第一次充放电不可逆容量约为50%. 采用XRD, XPS, SEM对薄膜的化学组成和表面形貌进行了表征, 并对反应机理进行了研究, 结果表明Mn4N在反应过程中转化为金属Mn和Li3N, 只有部分的Mn与Li3N参与了可逆的电化学反应.

关键词: 脉冲激光沉积, 锂离子电池, Mn4N, 薄膜

Abstract: A new thin film composed of transition metal nitride of Mn4N has been fabricated successfully by using reactive pulsed laser deposition and DC discharge methods in nitrogen ambient. The electrochemical reaction of the Mn4N thin film electrode with Li was firstly investigated by the discharge/charge, cyclic voltammetry, and AC impedance spectroscopy measurements. Mn4N thin film exhibited 420 mAh•g-1 in the first discharge process, and a nearly 50% irreversible capacity loss occurred in the first cycle. X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) were used to characterize the structure, morphology, and composition of the as-deposited, lithiated, and delithiated Mn4N thin films. The reversible reaction of the Mn4N thin film with lithium may involve partial conversion of metal Mn and Li3N into Mn4N. It should be responsible for the large capacity loss between the first and the second discharges.

Key words: Pulsed laser deposition, Li ion batteries, Mn4N, Thin films