Higher-voltage operation is crucial to increase the energy density of rechargeable batteries. Here we explored the Cr 4+ /Cr 3+ redox couple in a polyanion framework for a high-voltage sodium battery cathode. An archetypal NASICON-phase Na 3 Cr 2 (PO 4 ) 3 exhibited a reversible redox activity at ca. 4.5 V versus Na/Na +, offering further scope for searching new high-voltage materials based on Cr 4+ /Cr 3+ redox couple.
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Kawai et al. (2018) studied this question.
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