HT-LiCoO_(2) Thin Film Positive Electrodes Prepared by RF Magnetron Sputtering

摘要

Thin films of LiCoO_(2) prepared by RF magnetron sputtering on Si/SiO_(2)/Ti/Au substrates are investigated microstructural and electrochemical properties. The as deposited film shown layered with (003) preferred orientation. After annealing at 923 K in presence of O_(2) ambient (5 X 10~(-2) mbar), HT hexagonal phase LiCoO_(2) is obtained for the films deposited at O_(2) to Ar ratio 1:9 and at substrate temperature 523 K. LiCoO_(2) deposit is unambiguously shown two Raman bands at 465 and 545 cm~(-1) confirming layered hexagonal structure. Also, studied the performance of the LiCoO_(2) as positive electrode in aqueous (Pt//LiCoO_(2)) and non-aqueous (Li//LiCoO_(2)) Li-ion rechargeable batteries.