リチウムイオン伝導性Li₂SO₄-LiPO₃系ガラスの合成条件の検討

抄録

A 50Li₂SO₄･50LiPO₃ (mol%) glass was prepared by use of a traditional melt-quenching method. The structure and ion-conductivity of the glass were changed by the temperature at which the mother-melt of the glass was melted for the preparation of the glass. The Li₂SO₄ component was decomposed into Li₂O and SO₃ gas during the melting and the generated Li₂O reacted with PO₃^- oxoacid-salt unit and produced P₂O₇^4- unit in the melt. The conductivity of the glasses was slightly increased with an increase in the temperature at which the melt was obtained for the glass- preparation. The 50Li₂SO₄･50LiPO₃ glass obtained from the melt at 800°C showed the Li⁺-ion conductivity at 298 K, σ_298K = 2.2 x 10^-6 Scm^-1. An all-solid-state battery was composed with the 50Li₂SO₄･50LiPO₃ glass obtained from the melt at 800°C as solid electrolyte and with the cathode active materials LiNi_1/3Mn_1/3Co_1/3O₂. The all-solid-state battery showed good charge-discharge performance at 100°C.