Mixed Polyanion Na‐Mn‐V‐P Glass–Ceramic Cathode Network: Improved Electrochemical Performance and Stability
Vamsi Krishna Katta, Suman Gandi, Naresh Kumar Katari, Wanichaya Mekprasart, Wisanu Pecharapa, Dimple P. Dutta, Balaji Rao Ravuri
Abstract
This investigation demonstrates the electrochemical performance of glass and glass–ceramic NaMn 1− x (VO) x PO 4 ( x = 0.1, 0.3, 05, 0.7 mol%, and labeled as NM 1− x V x P) cathode material system via phase details, structural illustration, electronic conductivity, and reversible capacity, etc. Pro‐crystal calculation analysis is used to monitor Na + ion pathways’ migration for as‐precipitated NaMnPO 4 , Na 2 MnP 2 O 7 , and NaVO 3 phases. The highest conductivity is achieved (≈5.92 × 10 −7 S cm −1 ) for the glass–ceramic sample having x = 0.3 mol% (NM 0.7 V 0.3 P) due to the lowest charge transfer resistance ( R ct ). Electrochemical measurements of the best conducting sample using coin half‐cell exhibit two distinct voltage plateaus at 2 and 2.9 V versus Na/Na + , facilitating the active centers in two directions. The cyclability test of best‐conducting NM 0.7 V 0.3 P glass–ceramic network exhibits adequate reversible capacity up to 97% of the specific capacity even up to 50 cycles, which satisfies its superior stability for longer durations.