Halide-stabilized LiBH4, a room-temperature lithium fast-ion conductor

Hideki Maekawa, Motoaki Matsuo, Hitoshi Takamura, Mariko Ando, Yasuto Noda, Taiki Karahashi, Shin Ichi Orimo

Research output: Contribution to journalArticlepeer-review

332 Citations (Scopus)


Solid state lithium conductors are attracting much attention for their potential applications to solid-state batteries and supercapacitors of high energy density to overcome safety issues and irreversible capacity loss of the currently commercialized ones. Recently, we discovered a new class of lithium super ionic conductors based on lithium borohydride (LiBH4). LiBH4 was found to have conductivity as high as 10-2 Scm-1 accompanied by orthorhombic to hexagonal phase transition above 115 °C. Polarization to the lithium metal electrode was shown to be extremely low, providing a versatile anode interface for the battery application. However, the high transition temperature of the superionic phase has limited its applications. Here we show that a chemical modification of LiBH4 can stabilize the superionic phase even below room temperature. By doping of lithium halides, high conductivity can be obtained at room temperature. Both XRD and NMR confirmed room-temperature stabilization of superionic phase for LiI-doped LiBH4. The electrochemical measurements showed a great advantage of this material as an extremely lightweight lithium electrolyte for batteries of high energy density. This material will open alternative opportunities for the development of solid ionic conductors other than previously known lithium conductors.

Original languageEnglish
Pages (from-to)894-895
Number of pages2
JournalJournal of the American Chemical Society
Issue number3
Publication statusPublished - 2009 Jan 28


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