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Combinatorial Synthesis of Epitaxial LiCoO2 Thin Films on SrTiO3(001) via On-Substrate Sintering of Li2CO3 and CoO by Pulsed Laser Deposition
journal contribution
posted on 2016-04-28, 00:00 authored by Shingo Maruyama, Osamu Kubokawa, Kohei Nanbu, Kenjiro Fujimoto, Yuji MatsumotoHigh-quality single-phase epitaxial
LiCoO2 thin films
are synthesized on 0.5 wt % Nb-doped SrTiO3(001) substrates
by nanoscale alternate deposition of Li2CO3 and
CoO as Li and Co sources, respectively, using a combinatorial pulsed
laser deposition (PLD) technique. The formation of LiCoO2 thin films from these two sources results from the sintering reaction
between Li2CO3 and CoO, which is commonly used
in a bulk ceramics process, but simultaneously takes place on the
substrate during the deposition at a temperature of 550 °C. Electrochemical
characterization reveals that the charge/discharge property of LiCoO2 thin films as a cathode is severely sensitive to the nominal
Li:Co composition ratio. The best-quality film shows an excellent
discharge capacity comparable with the characteristic capacity of
LiCoO2.