Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (04): 823-830.doi: 10.3866/PKU.WHXB201202102

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Preparation and Characterization of xLi2MnO3·(1-x)Li[Ni1/3Mn1/3Co1/3]O2 Cathode Materials for Lithium-Ion Batteries

WANG Zhao, WU Feng, SU Yue-Feng, BAO Li-Ying, CHEN Lai, LI Ning, CHEN Shi   

  1. National Development Center of Hi-Tech Green Materials, School of Chemical Engineering & Environment, Beijing Institute of Technology, Beijing 100081, P. R. China
  • Received:2011-11-17 Revised:2012-01-09 Published:2012-03-21
  • Contact: SU Yue-Feng
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2009CB220100), National Natural Science Foundation of China (51102018), and National High-Tech Research and Development Program of China (863) (SQ2010AA1123116001).

Abstract: The lithium rich cathode materials xLi2MnO3·(1-x)Li[Ni1/3Mn1/3Co1/3]O2 (x=0.4, 0.5, 0.6) were successfully synthesized via sol-gel method with calcination in air. The transition metal acetate, lithium acetate, and citric acid were used as raw materials. The as-prepared materials were characterized by X-ray diffraction (XRD), scaning electron microscopy (SEM), and electrochemical tests. The material 0.5Li2MnO3·0.5LiNi1/3Mn1/3Co1/3]O2, which was obtained after calcination at 900 °C for 12 h, exhibited fine microstructures and good electrochemical performance. When cycled at 2.0-4.8 V with a current density of 20 mA·g-1 at room temperature, 0.5Li2MnO3·0.5LiNi1/3Mn1/3Co1/3]O2 delivered a initial discharge specific capacity of 260.0 mAh·g-1, and maintained a capacity of 244.7 mAh·g-1 after 40 cycles (capacity retention 94.12%).

Key words: Lithium-ion battery, Sol-gel, Solid solution, Cathode material, Electrochemical performance


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