Abstract
LiMn1/3Ni1/3Co1/3O2 cathode materials were successfully synthesized by simple and optimized solid-state reaction method. A mixture of MnO2, Ni(OH)2, Co(OH)2 and Li2CO3 with propylene glycol (PG) for grinding aid was ball-milled without any solvent and then calcined. The result of XRD analysis showed that the ball-milled powder was almost amorphousized and the calcined powder was identified as LiMn1/3Ni1/3Co1/3O2. EPMA analysis indicated the powder synthesized without PG contains a lot of Mn-rich particles. The effect of the addition of PG was obvious and it made the homogeneity of three transition metals and electrochemical performance dramatically improved. The 1st discharge capacity of the synthesized sample without PG showed 151.9 mAh/g in the voltage range of 2.6-4.3 V (versus Li+/Li) at the current density of 0.2 mA/cm2 and that with PG showed 160.8 mAh/g.
