静電噴霧法（ESD）により作製したリチウム複合酸化物薄膜の溶融炭酸塩中での安定性

抄録

LiCo_0.5Ni_0.5O₂, LiAl_0.25Ni_0.75O₂ and Li₄Mn₅O1₂ films were prepared by electrostatic spray deposition (ESD) onto gold substrates, and thelr stabilities in (62+38) mol% (Li+K) CO₃ at 923K under an oxidant gas condition were investigated by XRD and EDX techniques. XRD measurements revealed that after immersion in the melt, the LiCo_0.5Ni_0.5O₂ maintained the hexagonal structure, while the cubic phase of Li₄Mn₅O₁₂ changed to a monoclinic of Li₂MnO₃. The XRD pattern of LiAl_0.25Ni_0.75O₂ showed low crystallinity. The atomic ratios of Co/Ni and Al/Ni in the Ni-containing oxide films were found to be increased after immersion in the melt by EDX analysis, indicating that the nickel partly dissolved into the melt. The oxygen reduction currents at all the films were observed by cyclic voltammetry. It showed that the use of manganese is also hopeful as a cathode material of MCFC.