Synthesis and electrochemical characterization of layered Li(Ni1/3Co1/3Mn1/3)O2 cathode materials by low-temperature solid-state reaction

Cathode Li(Ni)(1/3)Co1/3Mn1/3)O-2 was prepared by solid-state reaction at low temperatures. Structures of the Li(Ni1/3Co1/3Mn1/3)O-2 were investigated as a function of synthesis temperature. The initial discharge capacities are 149, 167, and 161 mAh/g for samples synthesized at 600, 700, and 800 degrees C. Except for the sample synthesized at 600 degrees C, the other two samples showed excellent capacity retention at room temperature. Both samples showed better electrochemical properties than those synthesized by co-precipitation and conventional solid-state reaction. The rate capability of the synthesized materials is very good, and the capacity retention is also excellent after 20 cycles. (c) 2007 Elsevier B.V. All rights reserved.