Room temperature lithium fast-ion conduction and phase relationship of LiI stabilized LiBH4

R. Miyazaki; T. Karahashi; N. Kumatani; Y. Noda; M. Ando; H. Takamura; M. Matsuo; S. Orimo; H. Maekawa

doi:10.1016/j.ssi.2010.05.017

Room temperature lithium fast-ion conduction and phase relationship of LiI stabilized LiBH₄

R. Miyazaki, T. Karahashi, N. Kumatani, Y. Noda, M. Ando, H. Takamura, M. Matsuo, S. Orimo, H. Maekawa

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

In the present work, we focus attention on the effect of LiI addition to newly discovered pure lithium ion conductor, LiBH₄. Solid solution of the composition LiBH₄-LiI (LiI: 6.25-33.3 mol%) was 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 showed higher conductivities and lower activation energies in comparison with LiBH₄. Powder XRD measurement was carried out at 120 °C (just above the transition temperature of LiBH₄). The lattice constants of the solid solution were determined. DSC measurement showed a systematic compositional dependence on the transition temperature. The stabilization mechanism was discussed.

Original language	English
Pages (from-to)	143-147
Number of pages	5
Journal	Solid State Ionics
Volume	192
Issue number	1
DOIs	https://doi.org/10.1016/j.ssi.2010.05.017
Publication status	Published - 2011 Jun 16

Keywords

Electrical conductivity
LiBH
Lithium iodide
Lithium ion conductor
Solid electrolyte
Solid solution

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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title = "Room temperature lithium fast-ion conduction and phase relationship of LiI stabilized LiBH4",

abstract = "In the present work, we focus attention on the effect of LiI addition to newly discovered pure lithium ion conductor, LiBH4. Solid solution of the composition LiBH4-LiI (LiI: 6.25-33.3 mol%) was 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 showed higher conductivities and lower activation energies in comparison with LiBH4. Powder XRD measurement was carried out at 120 °C (just above the transition temperature of LiBH4). The lattice constants of the solid solution were determined. DSC measurement showed a systematic compositional dependence on the transition temperature. The stabilization mechanism was discussed.",

keywords = "Electrical conductivity, LiBH, Lithium iodide, Lithium ion conductor, Solid electrolyte, Solid solution",

author = "R. Miyazaki and T. Karahashi and N. Kumatani and Y. Noda and M. Ando and H. Takamura and M. Matsuo and S. Orimo and H. Maekawa",

year = "2011",

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doi = "10.1016/j.ssi.2010.05.017",

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T1 - Room temperature lithium fast-ion conduction and phase relationship of LiI stabilized LiBH4

AU - Miyazaki, R.

AU - Karahashi, T.

AU - Kumatani, N.

AU - Noda, Y.

AU - Ando, M.

AU - Takamura, H.

AU - Matsuo, M.

AU - Orimo, S.

AU - Maekawa, H.

PY - 2011/6/16

Y1 - 2011/6/16

N2 - In the present work, we focus attention on the effect of LiI addition to newly discovered pure lithium ion conductor, LiBH4. Solid solution of the composition LiBH4-LiI (LiI: 6.25-33.3 mol%) was 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 showed higher conductivities and lower activation energies in comparison with LiBH4. Powder XRD measurement was carried out at 120 °C (just above the transition temperature of LiBH4). The lattice constants of the solid solution were determined. DSC measurement showed a systematic compositional dependence on the transition temperature. The stabilization mechanism was discussed.

AB - In the present work, we focus attention on the effect of LiI addition to newly discovered pure lithium ion conductor, LiBH4. Solid solution of the composition LiBH4-LiI (LiI: 6.25-33.3 mol%) was 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 showed higher conductivities and lower activation energies in comparison with LiBH4. Powder XRD measurement was carried out at 120 °C (just above the transition temperature of LiBH4). The lattice constants of the solid solution were determined. DSC measurement showed a systematic compositional dependence on the transition temperature. The stabilization mechanism was discussed.

KW - Electrical conductivity

KW - LiBH

KW - Lithium iodide

KW - Lithium ion conductor

KW - Solid electrolyte

KW - Solid solution

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