P. Jeevan Kumar

Electrochemical Performance of rf Magnetron Sputtered LiCoO{sub 2} Thin Film Positive Electrodes

Thin films of LiCoO2 were grown by rf magnetron sputtering technique and studied the influence of In situ annealing treatment on microstructural and electrochemical properties of the films. Annealing treatment in presence of O2 ambient develops characteristic (104) plan in relative to (003) plane texture indicating that the films have HT‐layered structure with R3¯m symmetry. The effect is discussed in terms of grain size, cycling stability, reversibility and the specific discharge capacity.

HT‐LiCoO2 Thin Film Positive Electrodes Prepared by RF Magnetron Sputtering

Thin films of LiCoO2 prepared by RF magnetron sputtering on Si/SiO2/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 O2 ambient (5×10−2 mbar), HT hexagonal phase LiCoO2 is obtained for the films deposited at O2 to Ar ratio 1:9 and at substrate temperature 523 K. LiCoO2 deposit is unambiguously shown two Raman bands at 465 and 545 cm−1 confirming layered hexagonal structure. Also, studied the performance of the LiCoO2 as positive electrode in aqueous (Pt// LiCoO2) and non‐aqueous (Li// LiCoO2) Li‐ion rechargeable batteries.

Characteristics of HT-LiCoO2 cathode films synthesized by Rf magnetron sputtering

Polycrystalline HT-LiCoO2 films were successfully synthesized by rf magnetron sputtering. The films were characterized by the studying their phase, structure, and morphology using ex-situ measurements of X-ray diffractometry (XRD), Raman Spectroscopy, Atomic force micrometry (AFM). Electrochemical performance evaluation indicated that the as grown LiCoO2 films The anodic electrochemical performances of the films have been evaluated by cyclic voltammetry (CV) at a scan rate of 0.5 mV/s and by galvanostatic cycling, with lithium metal as the counter and the reference electrode, and cycled in the range of 3.0 - 4.2 V at a current density of 50 μA/cm2. The films show a discharge capacity at the 20th cycle of 58 μAh cm−2μm− Keywords: LiCoO which exhibited excellent capacity retention with a small capacity fade which exhibited excellent capacity retention with a small capacity fade.