Division of Hydrogen Functional Materials, in collaboration with Swiss Federal Institutes (EMPA and ETH-Zürich) and Graduate School of Engineering, Tohoku University, has developed new complex hydrides exhibiting lithium fast-ion conduction at room temperature. The hydrides consisting of plural complex anions [(BH4)- and (NH2)-] exhibit lithium-ion conductivity of nearly 10,000 times higher than those of the conventional hydrides with single complex anion. This study demonstrates an important research direction on searching for advanced lithium-ion conductors and solid-electrolytes. This work was supported by Global COE program of Tohoku University, Integrated Project of ICC-IMR, and KAKENHI Grant-in-Aid for Scientific Research (A); and the results were published in Journal of the American Chemical Society (online, October 26th, 2009).
図： 錯イオンが四面体配位したLi+イオンサイト。新たな錯体水素化物群のひとつであるLi4(BH4)(NH2)3では、2種類の錯イオン[(BH4)- と (NH2)-]が配位することによりLi+イオンサイトが多様化する。その結果、Li(BH4)（あるいはLi(NH2)）と比較して室温 に おいて 約10,000倍もの高いリチウムイオン伝導性を示す。