Issue 8, 2003

Influence of Mn content on the morphology and electrochemical performance of LiNi1−xyCoxMnyO2 cathode materials

Abstract

LiNi1−xyCoxMnyO2 cathode materials were successfully synthesized by a sol–gel method. X-Ray diffraction patterns show that these materials have a typical layered structure with R[3 with combining macron]m space group. The effect of Mn content and sintering temperature on the surface morphology has been carefully examined by scanning electron microscopy. Among the substituted materials synthesized, LiNi0.65Co0.25Mn0.1O2 sintered at 850 °C has shown the best characteristics in terms of initial capacity (198 mA h g−1) and capacity retention (92%). However, excessive Mn substitution (y > 0.3) leads to a significant decrease in both initial capacity and capacity retention. Preliminary X-ray absorption near edge structure (XANES) results for LiNi1−xyCoxMnyO2 cathode materials revealed that the oxidation state of Ni is decreased when the amount of Mn substituted for Ni is increased.

Graphical abstract: Influence of Mn content on the morphology and electrochemical performance of LiNi1−−CoMnO2 cathode materials

Supplementary files

Article information

Article type
Paper
Submitted
05 Feb 2003
Accepted
10 Jun 2003
First published
23 Jun 2003

J. Mater. Chem., 2003,13, 1962-1968

Influence of Mn content on the morphology and electrochemical performance of LiNi1−xyCoxMnyO2 cathode materials

B. J. Hwang, Y. W. Tsai, C. H. Chen and R. Santhanam, J. Mater. Chem., 2003, 13, 1962 DOI: 10.1039/B301468C

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