Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (4): 669-676.doi: 10.3866/PKU.WHXB201402102

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Preparation and Electrochemical Performance of 5 V LiNi0.5Mn1.5O4 Cathode Material by the Composite Co-Precipitation Method for High Energy/High Power Lithium Ion Secondary Batteries

ZHU Zhi1, QI Lu1, LI Wei2,3, LIAO Xi-Ying3   

  1. 1 College of Chemistry and Molecular Engineering, Peking University, Beijing 100190, P. R. China;
    2 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083;
    3 SYN Chemicals & Technology (Beijing) Co. Ltd., Beijing 100094, P. R. China
  • Received:2013-11-19 Revised:2014-01-26 Published:2014-03-31
  • Contact: QI Lu E-mail:gilu297542@pku.edu.cn

Abstract:

This research developed a novel composite co-precipitation method to prepare high performance LiNi0.5Mn1.5O4 based on a traditional solid-state method. Ammonium oxalate/ammonium carbonate was used as a composite precipitator to deposit Ni/Mn ions. Combined with a facile hydrothermal treatment, stoichiometric LiNi0.5Mn1.5O4 was obtained with a pure spinel structure and spherical hierarchical morphology. Electrochemical measurements indicate that the as-prepared LiNi0.5Mn1.5O4 delivers a high capacity of 141.4 mAh·g-1 and after 200 cycles under 0.3C, 1C, and 3C, the materials retained their capacities up to 96.3%, 94.4%, and 91.1%, respectively. Additionally, the capacity upon exposure to a low voltage of 4.0 V was efficiently eliminated by heat treatment and by a particular cooling process. Furthermore, the LiNi0.5Mn1.5O4 materials with high energy and high power performances of 648.6 mWh·g-1 and 7000mW·g-1 were obtained because of different cation ordering.

Key words: Lithium ion battery, Spinel lithium nickel magnesium oxide, High energy/high power, Co-precipitation method, Spherical hierarchical morphology

MSC2000: 

  • O646