Review compares NVPF and NVOPF cathodes to evaluate their stability and performance in sodium-ion batteries, indicating design guidelines for future materials.
Key Points
To assess the structural and electrochemical properties of NASICON-type cathodes for sodium-ion batteries, focusing on NVPF and NVOPF materials.
Critical comparison of two vanadium-based fluorophosphate cathodes: Na3V2(PO4)2F3 (NVPF) and Na3V2O2(PO4)2F (NVOPF).
Evaluation of their crystal structures, sodium storage mechanisms, and interfacial stabilities under high-voltage operation.
Discussion of anion chemistry modulation strategies to enhance performance.
NVPF exhibits a higher redox potential with V3+/V4+ couple compared to NVOPF, which shows enhanced electronic conductivity due to partial F− to O2− substitution.
Both cathodes show distinct sodium storage behaviors and degradation characteristics when subjected to high-voltage operation.
Insights into structural chemistry's impact on electrochemical performance and interfacial stability are presented.