S. I. Vecherskii, M. A. Konopelko, B. D. Antonov, N. N. Batalov, M. A. Zvezdkin, I. V. Zvezdkina.
ABSTRACT
Oxides LaCoO3-d + (z/2) Li2O (0 ≤ z ≤ 0.15) were synthesized and studied to elucidate variation of electrophysical properties of LaCoO3-d due to lithiation “in situ” in (Li0.62K0.38)2CO3 eutectic melt. It has been found that a perovskite-like solid solution (La1-хLix)(LiхСо1-х)O3-d, where х = z/(z + 2), forms as a result of doping by Li. The solid solution region does not exceed 2х = 0.072. At higher lithium content LiCoO2 appears along with the main perovskite-like phase. Single-phase samples exhibit a metallic type of conductivity and positive thermopower at the molten carbonate operating temperature 920 K. Electrical conductivity of Li-doped samples is 1.5 or less time smaller compared to LaCoO3-d, it varies in the range 3.2 × 104–3.8 × 104 S/m.
KEY WORDS
molten carbonate, fuel cell, perovskite, lanthanum cobaltite, electrical conductivity.