Abstract
Ion exchange reactions have been tested in sodium-containing NASICON materials in order to prepare Li1 + xAlxTi2 − x(PO4)3 compounds with high lithium content, x ≥ 0.6. However, the studied lithium exchange reactions are not complete and the final solids have an appreciable sodium content. Structural characterisation by the Rietveld method reveals that sodium partially remains at the M1 site and the M2 site is fully exchanged by Li+ cations. The electrical properties have been characterised by an impedance study. The Li-exchanged NASICONs have lower dc conductivities and higher activation energies than the pure sodium analogues. This is likely due to the mixed alkali effect and because some percolation pathways are disabled.
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