New lithium-ion conductors based on the NASICON structure

Abstract

Lithium-ion conduction in mixed-metal phosphates, LiMVM^III(PO₄)₃ [MV=Nb, Ta; M^III=Al, Cr, Fe], possessing the rhombohedral (R3̄c) NASICON structure has been investigated. Among the phosphates investigated, LiTaAl(PO₄)₃ exhibits the highest conductivity, σ≈1.0×10^–2 S cm^–1 at 350 °C (E_a=0.47 eV), comparable to the conductivity of LiTi₂(PO₄)₃. Unlike LiTi₂(PO₄)₃ which contains lithium-reducible Ti^IV, LiTaAl(PO₄)₃ contains stable TaV and Al^III oxidation states and hence deserves further attention towards tailoring new lithium-ion conductors for application as electrolytes in solid state lithium batteries.

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