Improving the ionic conductivity of NASICON through aliovalent cation substitution of Na3Zr2Si2PO12
作者： Adam G. Jolley , Gil Cohn , Gregory T. Hitz , Eric D. Wachsman
DOI: 10.1007/S11581-015-1498-8
关键词: Oxidation state 、 Electrochemistry 、 Zirconium 、 Inorganic chemistry 、 Ionic bonding 、 Ionic conductivity 、 Materials science 、 Ionic radius 、 Conductivity 、 Fast ion conductor
摘要: Doping the zirconium site in NASICON (Na3Zr2Si2PO12) with lower valent cations enhanced ionic transport of material. Both Na3.2Zr1.8M0.2Si2PO12 (M=Al3+, Fe3+, Y3+) and Na3.4Zr1.8M0.2Si2PO12 (M=Co2+, Ni2+, Zn2+) exhibited a higher bulk conductivity than undoped Na3Zr2Si2PO12 at room temperature. A decrease low temperature activation energy for all doped was observed, which helped contribute to conductivity. The materials were result alterations structure. charge imbalance created by aliovalent substitution increased sodium lattice resulting more carriers better mobility. Furthermore, optimized radius species site. Ultimately, +2 oxidation state cation having an approximately 0.73 A (Zn Co) attained maximum Zn-doped displayed greatest 3.75 × 10−3 S/cm, while Co-doped demonstrated total 1.55 × 10−3 S/cm.
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