Enhanced Electrical Conductivities of Complex Hydrides Li<SUB>2</SUB>(BH<SUB>4</SUB>)(NH<SUB>2</SUB>) and Li<SUB>4</SUB>(BH<SUB>4</SUB>)(NH<SUB>2</SUB>)<SUB>3</SUB> by Melting

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  • Zhou Yu
    Institute for Materials Research, Tohoku University
  • Matsuo Motoaki
    Institute for Materials Research, Tohoku University
  • Miura Yohei
    Institute for Materials Research, Tohoku University
  • Takamura Hitoshi
    Graduate School of Engineering, Tohoku University
  • Maekawa Hideki
    Graduate School of Engineering, Tohoku University
  • Remhof Arndt
    Empa, Swiss Federal Laboratories for Materials Science and Technology, Division of Hydrogen and Energy
  • Borgschulte Andreas
    Empa, Swiss Federal Laboratories for Materials Science and Technology, Division of Hydrogen and Energy
  • Züttel Andreas
    Empa, Swiss Federal Laboratories for Materials Science and Technology, Division of Hydrogen and Energy
  • Otomo Toshiya
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • Orimo Shin-ichi
    Institute for Materials Research, Tohoku University

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  • Enhanced electrical conductivities of complex hydrides Li2(BH4)(NH2) and Li4(BH4)(NH2)3 by melting

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Abstract

The electrical conductivities of complex hydrides Li2(BH4)(NH2) and Li4(BH4)(NH2)3 consisting of (BH4)− and (NH2)− anions are investigated focusing on their low melting temperatures (365 K for Li2(BH4)(NH2) and 490 K for Li4(BH4)(NH2)3). The two hydrides show lithium fast-ion conductivities of about 1×10−4 S·cm−1 at room temperature. After melting, the total ion conductivities of Li2(BH4)(NH2) and Li4(BH4)(NH2)3 reach 6×10−2 S·cm−1 (378 K) and 2×10−1 S·cm−1 (513 K), respectively. The crystal structure and local atomistic structures closely correlated with the lithium ion conduction before and after melting are also discussed.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 52 (4), 654-657, 2011

    The Japan Institute of Metals and Materials

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