Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (01): 65-70.doi: 10.3866/PKU.WHXB20060113

• ARTICLE • Previous Articles     Next Articles

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

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