Novel diffuse scattering techniques reveal the presence of short-range ionic order upon intercalation in an archetypical cathode material.
Significance and Impact
Understanding of how order-disorder transitions limit ionic transport is paramount in designing materials with improved properties.
- Single crystal diffuse scattering measurements were performed on the cathode material, Na0.45V2O5.
- Measurements over large volumes of reciprocal space enabled transformation into pair distribution functions that reveal short-range order in real space (3D-ΔPDF).
- The 3D-ΔPDF directly shows the formation of ordered zig-zag chains of Na-ions within the vanadium oxide matrix.
- Such atomic ordering of intercalant ions disrupts ionic mobility and hence is detrimental to battery performance.
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