Combinatorial Synthesis of Epitaxial LiCoO2 Thin Films on SrTiO3(001) via On-Substrate Sintering of Li2CO3 and CoO by Pulsed Laser Deposition

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• 作者：Shingo Maruyama ; Osamu Kubokawa ; Kohei Nanbu ; Kenjiro Fujimoto ; Yuji Matsumoto
• 刊名：ACS Combinatorial Science
• 出版年：2016
• 出版时间：June 13, 2016
• 年：2016
• 卷：18
• 期：6
• 页码：343-348
• 全文大小：463K
• 年卷期：0
• ISSN：2156-8944

文摘

High-quality single-phase epitaxial LiCoO<sub>2sub> thin films are synthesized on 0.5 wt % Nb-doped SrTiO<sub>3sub>(001) substrates by nanoscale alternate deposition of Li<sub>2sub>CO<sub>3sub> and CoO as Li and Co sources, respectively, using a combinatorial pulsed laser deposition (PLD) technique. The formation of LiCoO<sub>2sub> thin films from these two sources results from the sintering reaction between Li<sub>2sub>CO<sub>3sub> 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 LiCoO<sub>2sub> 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 LiCoO<sub>2sub>.