Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (06): 1507-1514.doi: 10.3866/PKU.WHXB20100638

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Characterization of LiNi1/3Mn1/3Co1/3O2 Synthesized by Wet-Chemical Method

ZHANG Xiao-Yu, JIANG Wei-Jun, ZHU Xiao-Pei, QI Lu   

  1. Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China; CITIC Guoan Mengguli Power Source Technology Co., Ltd., Beijing 102200, P. R. China
  • Received:2010-02-09 Revised:2010-03-24 Published:2010-05-28
  • Contact: QI Lu E-mail:qilu@pku.edu.cn

Abstract:

A series of cathode materials LiNi1/3Mn1/3Co1/3O2 for lithium-ion batteries were successfully synthesized using succinic acid as a chelating agent by a wet-chemical method. We varied the succinic acid to metal-ion molar ratios (R) and investigated the effect of this parameter on the physical and electrochemical properties of the prepared LiNi1/3Mn1/3Co1/3O2. The reaction mechanism, structural, morphological, and magnetic properties of the powders were characterized in detail by thermogravimetry (TG), X-ray diffraction (XRD), Rietveld refinement, scanning electron microscopy (SEM), and superconducting quantuminterface device (SQUID).We determine that the optimumconditions for the synthesis of LiNi1/3Mn1/3Co1/3O2 assisted with succinic acid is R=1, at the lowest amount of cation mixing. In addition, measurement of the magnetic properties revealed a concentration of Ni on the 3b Wyckoff site of the lithium-ions in good agreement with the results from the Rietveld refinement on the XRD spectra. For LiNi1/3Mn1/3Co1/3O2 (R=1), the Rietveld refinement showed that cation mixing in this sample was 1.85%, which is in quantitative agreement with that fromthe SQUIDresult (1.80%). It delivered an initial discharge capacity of 161 mAh·g-1 at a current rate of 0.2C (1C=160 mA·g-1) and at a cut-off voltage of 3.0-4.3 V with a coulombic efficiency of 93.1% and its capacity retention was 91.3% after 50 cycles.

Key words: Lithium-ion battery, LiNi1/3Mn1/3Co1/3O2, Wet-chemical method, Cation mixing, Magnetic property

MSC2000: 

  • O646