Characterization and cathode performance of Li1 − xNi1 + xO2 prepared with the excess lithium method

Samples of Li_{1 ? z}Ni_{1 + x}O₂ with various x values were synthesized and their electrochemical properties, phase transitions, and ordering phenomena were investigated comparatively. In order to synthesize samples with a small x value, an excess lithium was used as a starting material to compensate for lithium loss during the calcination process. A stoichiometric sample with a large reversible capacity of more than 200 mAh g^?1 is also described.