Asian Science
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LiCoPO4 thin films were deposited on Li1+x+yAlxTi2-xSiyP3-yO12
(LATSP) solid electrolyte by radio frequency magnetron sputtering and were characterized
by X-ray diffraction and scanning electron microscope. The films show a (1 1 1)
preferred orientation upon annealing and are chemically stable with LATSP up
to 600 °C in air. An all-solid-state Li/PEO18-Li(CF3SO2)2N/LATSP/LiCoPO4/Au
cell was fabricated to investigate the electrochemical performance and Li-ion
chemical diffusion coefficients, ,
of the LiCoPO4 thin films. The potential dependence of
values of the LiCoPO4 thin film was investigated by potentiostatic
intermittent titration technique and was compared with those of the LiFePO4
thin film. These results showed that the intercalation mechanism of Li-ion in
LiCoPO4 is different from that in LiFePO4.