Na3V2(PO4)3 (NVP) cathode materials with the advantages of long cycle life and superior thermal stability have been considered promising cathode candidates for SIBs. However, the unsatisfied energy density derived from low theoretical capacity and operating voltage (3.35 V vs. Na+/Na, based on V3+/V4+ redox couple) inevitably limits their practical application. Therefore, the activation of V4+/V5+ redox couple (~4.0 V vs. Na+/Na) in NVP-based cathode materials to boost the energy density of SIBs has attracted extensive attention. Herein, we first analyze the challenges of activation of V4+/V5+ redox couple in NVP-based cathode materials. Subsequently, the recent achievement of NVP-based cathode materials with activated V4+/V5+ redox reaction for SIB is overviewed. Finally, further research directions of high voltage V4+/V5+ redox reaction in NVP-based cathode are proposed. This review provides valuable guidance for developing high energy density NVP-based cathode materials for SIBs.

This article is Open Access

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