Influence of synthesis methods on the electrochemical performance of LiNi_1/3Co_1/3Mn_1/3O₂

Layer-structured LiNi_1/3Co_1/3Mn_1/3O₂ cathode materials were prepared successfully by self-propagating solid-state metathesis, rheological phase method and self-propagating solid-state metathesis-rheological phase method. LiNi_1/3Co_1/3Mn_1/3O₂ materials were studied by SEM, XRD and electrochemical test. The results indicate that the sample synthesized by self-propagating solid-state metathesis-rheological phase method has the best two-dimensional layered structure, cationic degree of order and uniform particle distribution. The initial specific discharge capacity is 185.9, 169.9, 157.5 and 134.7 mAh/g at 0.2, 0.5, 1, 2C respectively, showing favorable rate electrochemical performance. The cycle test at 0.5C shows discharge capacity retention rate is 84.7% after 20 cycles. Increasing charge cut-off voltage could improve the previous discharge capacity, and the initial discharge capacity is 197 mAh/g in the voltage range of 2.8-4.6V, while the irreversible capacity presents increasing.