Nanostructrured LiNi~(1/3)Co~(1/3)Mn~(1/3)O_2 Cathode Material Synthesized by One-step Ultrasonic Spray Pyrolysis Method

摘要

Nanostructured LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 powders were successfully synthesized via a new innovative one-step ultrasonic spray pyrolysis process. The prepared powders were comprised of nanosized crystallites and formed a spherical shape. Well-crystallized structure was obtained after calcination at 800 ℃. The prepared LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 powders exhibited a high discharge capacity of 184 mAh/g. At 20 C high discharge rate, a capacity retention as high as 55% was obtained comparing to the 0.1C discharge rate capacity within the voltage range of 2.5—4.5 V. The capacity retention was 78% after 100 cycles test at 1C charging and 3C discharging rate at 55 ℃. In-situ XRD showed the structural stability of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 powders was quite good at overcharged state.