ENHANCED LITHIUM IONIC CONDUCTIVITY IN LiBH4 BY ANION SUBSTITUTION
In the present work, we focus attention on the effect of LiI and LiBr addition to newly discovered pure lithium ion conductor, LiBH4. Solid solution of the composition LiBH4-LiI and LiBH4-LiBr (LiI: 6.25～33.3 mol%, LiBr: 6.25～25.0 mol%) were synthesized by solid-state reaction. Electrical conductivity was measured from room temperature to 140°C by ac impedance method, which revealed the fast ion conduction phase of LiBH4 can be stabilized to lower temperature, below the room temperature. Solid solution with LiI and LiBr showed lower activation energies of ion conduction in comparison with pure LiBH4. The lattice constants of the solid solution were calculated from the powder CuKα XRD pattern at 120°C, showing the formation of a LiBH4-LiI or-LiBr solid solution at measured temperature. The relation between the ion conduction path in LiBH4 and the modification of the bottleneck structure was discussed under the assumption of the random distribution of halide ion.
R. MIYAZAKI N. KUMATANI K. KANNO M. ANDO M. MATSUO H. TAKAMURA S. ORIMO H. MAEKAWA
Department of Metallurgy, Graduate School of Engineering, Tohoku University,Aramaki Aza Aoba 6-6-2 S Institute for materials research, Tohoku University, Sendai, Katahira 2-1-1 Sendai, Miyagi, 980-8577
国际会议
The 12th Asian Conference on Solid State Ionics(第十二届亚洲固态离子学会议暨第十五届中国固态离子学会议)
武汉
英文
306-311
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）