Enhancing the rate capability of Na4Fe3(PO4)2(P2O7) by partial co-substitution of V3+ and Al3+ for Fe2+

Key Points

• The aim is to enhance the rate capability of sodium iron pyrophosphate by modifying its composition.
• Partial co-substitution of V3+ and Al3+ for Fe2+ in Na4Fe3(PO4)2(P2O7)
• Characterization of electrical properties and Na+ diffusion
• Comparison of modified and unmodified materials in sodium-ion battery setups.
• Significant improvement in electron conductivity observed in modified samples.
• Enhanced Na+ diffusion kinetics compared to pure sodium iron pyrophosphate.
• Improved battery performance metrics in tests with co-substituted materials.