Structural and electrochemical properties of LiNi0.4Co0.4−xAl0.2+xO2 cathode materials for lithium-ion batteries

Three Al doped lithium nickel cobalt oxide (LiNi_0.4Co_0.4−xAl_0.2+xO₂) cathode materials for lithium ion batteries were synthesized by solid state reaction method at a temperature of 800 °C for 18 hours. The samples were crystalline as revealed by powder X-Ray diffraction (XRD). The ratios of the elements were determined by Energy Dispersive Analysis of X-rays (EDAX). The electrochemical properties obtained by charge/discharge cycling showed that the average discharge capacity for LiNi_0.4Co_0.4Al_0.2O₂ was 117 mAh/g. A good capacity retention was also shown by the material upon cycling. Paper presented at the International Conference on Functional Materials and Devices 2005, Kuala Lumpur, Malaysia, June 6 – 8, 2005.