NMR study on LiBrH2O-Al2O3 composite solid electrolyte.

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  • ASAI Takeshi
    The Institute of Scientific and Industrial Research, Osaka University
  • KAWAI Shichio
    The Institute of Scientific and Industrial Research, Osaka University

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  • ＬｉＢｒ・Ｈ２Ｏ‐Ａｌ２Ｏ３複合系固体電解質のＮＭＲによる研究
  • LiBr H2O Al2O3 ノ フクゴウケイ コタイ デンカイシツ ノ NM

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Enhancement of ionic conductivity in the LiBr·H2O-Al2O3 composite solid electrolyte was studied by means of the 7Li spin-lattice relaxation time T1. In α-LiBr·H2O, T1 was determined by the Li diffusion with an activation energy of 52kJ mol-1. In the composite solid electrolyte, two values of T1 were observed at each temperature. One of them was attributed to LiBr·H2O, because it had the same value as T1 of LiBr·H2O, while the other had a very low activation energy of 18kJ mol-1. This is the first time that the presence of a highly conductive phase in the composite solid electrolyte has been confirmed experimentally. Magnetization showed that the volumes of these two phases were about equal. The thickness of the highly conductive layer on an alumina particle was estimated to be 0.07∼0.2μm.

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