高温固相法合成锂离子电池正极材料LiNi1/3Co1/3Mn1/3O2研究

Layered structure of LiNi1/3Co1/3Mn1/3O2 cathode material was prepared by a solid state method with the precursor activated by ball milling.The influences of the synthesis temperature on the electrochemical behaviors of LiNi1/3Co1/3Mn1/3O2 were also analyzed. XRD,SEM and electrochemical tests were used to characterize the structure,micro-morphology and electrochemical properties of the materials.The results show that the pure LiNi1/3Co1/3Mn1/3O2 phase with α-NaFeO2 layer structure is obtained at 950℃ for 15h in air.The as-prepared LiNi1/3Co1/3Mn1/3O2 with uniform primary particles delivers initial discharge capacity of 168.8mAh g-1 at 0.2C rate in the voltage of 2.5-4.5V.After 50 cycles,the capacity retention ration is 87.1%,respectively,indicating good cycling stability.