Synthesis and electrochemical performance of doped LiCoO2 materials

Authors

S. A. Needham, University of WollongongFollow
G. X. Wang, University of WollongongFollow
Hua-Kun Liu, University of WollongongFollow
V. A. Drozd, National Synchrotron Research Centre
R. S. Liu, University of WollongongFollow

RIS ID

23321

Publication Details

Needham, S. A., Wang, G., Liu, H. K., Drozd, V. & Liu, R. (2007). Synthesis and electrochemical performance of doped LiCoO2 materials. Journal of Power Sources, 174 (2), 828-831.

Abstract

Layered intercalation compounds LiM_0.02Co_0.98O₂ (M = Mo⁶⁺, V⁵⁺, Zr⁴⁺) have been prepared using a simple solid-state method. Morphological and structural characterization of the synthesized powders is reported along with their electrochemical performance when used as the active material in a lithium half-cell. Synchrotron X-ray diffraction patterns suggest a single phase HT-LiCoO₂ that is isostructural to α-NaFeO₂ cannot be formed by aliovalent doping with Mo, V, and Zr. Scanning electron images show that particles are well-crystallized with a size distribution in the range of 1–5 μm. Charge–discharge cycling of the cells indicated first cycle irreversible capacity loss in order of increasing magnitude was Zr (15 mAh g⁻¹), Mo (22 mAh g⁻¹), and V (45 mAh g⁻¹). Prolonged cycling the Mo-doped cell produced the best performance of all dopants with a stable reversible capacity of 120 mAh g⁻¹ after 30 cycles, but was inferior to that of pure LiCoO₂.