Morphology Effects on the Electrochemical Performance of LiNi_1 − x Co_x  O ₂

is being considered for use as a cathode material in commercial lithium‐ion batteries because of its higher capacity and lower material cost than its end member . On the other hand, has better thermal stability than its other end member . In this paper we examine the influence of particle size and particle morphology on the electrochemical behavior of and the dependence of the irreversible capacity on Co content, temperature, and particle size. Coin cell performance at room temperature and at 40°C indicates that with a large crystal particle size (P_c) has a low capacity fade rate. The irreversible capacity is reduced at high temperature. By optimizing particle size and cobalt content in it is possible to achieve cycle performance comparable with at room temperature and at 40°C, and have a reversible capacity (between 150 and 200 mAh/g ) substantially higher than (140 mAh/g). (0.1 < x < 0.3) tested at C/1 discharge and at 40°C also shows a low capacity fade rate comparable to that of material.