NaCrO with high rate-capability is an attractive cathode material for sodium-ion batteries (NIBs). However, the amount of reversibly extractable Na ions is restricted by half, which results in relatively low energy density for practical NIB cathodes. Herein, we describe aliovalent-doped O3-Na[CrSn]O (NCSnO) and O3-Na[CrSb]O (NCSbO), both of which show high-voltage characteristics that translate to an increase in energy density.
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