Electrochemical performance of Na4P2O7 decorated Na4MnV(PO4)3/C cathode material for sodium-ion batteries

Na4P2O7 decorated Na4MnV(PO4)3/C (NMVP-SP) composites were prepared by a simple sol–gel method combined with high-temperature calcination in inert atmosphere. As a cathode material for sodium-ion batteries, the optimal NMVP-SP presents much higher capacity, better rate capability and cyclability than Na4MnV(PO4)3/C, which is attributed to Na4P2O7 coating that has good ionic conductivity and inhibits the manganese dissolution from Na4MnV(PO4)3 in electrolyte.