Progress in High-Voltage Cathode Materials for Rechargeable Sodium-Ion Batteries

This review summarizes the recent progress with the emerging high-voltage cathode materials for room-temperature sodium-ion batteries, which include layered transitional-metal oxides, Na-rich materials, and polyanion compounds

Ya You

2017

Scholarcy highlights

  • The growing demand for energy and finite traditional fossil energy supplies give rise to an urgent desire for utilizing renewable clean energy, e.g., solar, tide, and wind
  • The formation of a NASICON-structured Na3V2(PO4)3 phase instead of NaVPO4F could be possible because the XRD patterns and charge/discharge curves of both materials are quite identical, as suggested by Paula et al
  • A new V-based pyrophosphate cathode material, Na7V3(P2O7)4 with a space group of C2/c, was demonstrated by Jongsoon et al. It was revealed that Na7V3(P2O7)4 was capable of delivering an average voltage of 4.13 V, which may represent one of the highest values observed for the V3+/4+ redox couple in sodium-ion batteries
  • 3.4 High-voltage polyanion positive electrode materials based on Ni2+/3+ The redox energy of Ni2+/3+ is located at > 4.5 V, which represents the highest operating potential in SIBs
  • There are still a lot of new materials and new chemistry need to be explored for SIB cathodes
  • 3.4 High-voltage polyanion positive electrode materials based on Ni2+/3+ The redox energy of Ni2+/3+ is located at > 4.5 V, which represents the highest operating potential in sodium-ion batteries. The theoretical output voltage of olivine NaNiPO4 was calculated to be 4.58 V; its electrochemical activity has never been verified experimentally

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