Lan Rong, Tao Shanwen
Department of Chemical and Process Engineering, University of Strathclyde, Glasgow G1 1XJ (UK).
Chemistry. 2015 Jan 12;21(3):1350-8. doi: 10.1002/chem.201404476. Epub 2014 Nov 13.
New ionic conducting materials for electrolytes for electrochemical devices have been attracting the interest of researchers in energy materials. Here, for the first time, we report a conductive composite with high ionic conductivity derived from an electronic conductor α-LiFeO2 and an insulator γ-LiAlO2. High conductivity was observed in the α-LiFeO2-γ-LiAlO2 composite when prepared by a solid state reaction method. However, the conductivity enhancement in α-LiFeO2-γ-LiAlO2 composite was not observed when the two oxides were mechanically mixed. The α-LiFeO2-γ-LiAlO2 composite also exhibits O(2-) or/and H(+) ionic conduction which was confirmed through H2/air fuel cell measurements. An exceptionally high conductivity of 0.50 S cm(-1) at 650 °C was observed under H2/air fuel cell conditions. This provides a new approach to discover novel ionic conductors from composite materials derived from electronic conductors.
用于电化学装置电解质的新型离子导电材料一直吸引着能源材料领域研究人员的关注。在此，我们首次报道了一种由电子导体α-LiFeO₂和绝缘体γ-LiAlO₂衍生而来的具有高离子电导率的导电复合材料。当通过固态反应法制备时，在α-LiFeO₂-γ-LiAlO₂复合材料中观察到了高电导率。然而，当将这两种氧化物机械混合时，未观察到α-LiFeO₂-γ-LiAlO₂复合材料的电导率增强。α-LiFeO₂-γ-LiAlO₂复合材料还表现出O(2-)或/和H(+)离子传导，这通过H₂/空气燃料电池测量得到了证实。在H₂/空气燃料电池条件下，在650 °C时观察到了高达0.50 S cm⁻¹的异常高电导率。这为从电子导体衍生的复合材料中发现新型离子导体提供了一种新方法。
