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New lithium ion conductors of M-doped LiScO2 (M = Zr, Nb, and Ta) were synthesized by a solid-state reaction method. Peak shifts of the X-ray diffraction patterns revealed the formation of solid solutions with aliovalent cation doping. In addition, increase in the ionic conductivity by the M doping is indicated. The highest total conductivity of 7.94 × 10 S cm at 623 K with an activation energy of 88 ± 5 kJ mol was observed for the Zr doped sample in the systems. The Zr doped system showed the largest solid solution limit in Li1−xSc1−xZrxO2 (x ≈ 0.1) and continuous increase of the conductivity with increasing x. Structural analysis by Rietveld refinement indicated that the lattice expansion and lithium-ion vacancy formation by the Zr doping in the structure, which could contribute to the increase in the ionic conductivity.

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Synthesis, Crystal Structure, and the Ionic Conductivity of New Lithium Ion Conductors, &lt;i&gt;M&lt;/i&gt;-Doped LiScO&lt;sub&gt;2&lt;/sub&gt; (&lt;i&gt;M&lt;/i&gt; = Zr, Nb, Ta)