Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (06): 1232-1238.doi: 10.3866/PKU.WHXB20090629

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Doping of Layered LiMnO2 as Cathode Materials for Lithium-Ion Batteries and Their Electrochemical Properties

SU Zhi, XU Mao-Wen, YE Shi-Hai, WANG Yong-Long   

  1. College of Life Science and Chemistry, Xinjiang Normal University, Urumqi 830054, P. R. China|Institute of New Energy Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
  • Received:2008-12-26 Revised:2009-03-09 Published:2009-06-05
  • Contact: SU Zhi E-mail:suzhixj@sina.com

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Abstract:

Hydrothermal methods were used to prepare doped LiMxMn1-xO2(M=Mg, Y, Zr) as cathode materials for lithium-ion batteries. The structure and morphology of the as-prepared cathode materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The effects of ion doping on the performance of orthorhombic materials was analyzed in terms of their crystal structure, charge-discharge curves, cycle performance and electrochemical impedance spectroscopy (EIS). Results show that the doped materials had better cycle performance. In particular, the discharge capacity of Li0.99Mn0.979Y0.021O2 remains 226.3 mAh·g-1 after 60 cycles with a current density of 50 mA·g-1 at roomtemperature.

Key words: Layered LiMnO2, Doping, Hydrothermal synthesis, Electrochemical property