Preparation and sodium storage performance of carbon-coated Na4Fe3(PO4)2P2O7@C cathode material for sodium-ion batteries
PEI Man
MA Tian
CHEN Yu
ZHOU Xi
CHEN Lei
LIU Wei
Abstract：The carbon-coated sodium ferric pyrophosphate[Na4Fe3(PO4)2P2O7@C,abbreviated as NFPP@C]composite material was successfully prepared using the sol-gel method,with an optimized heat treatment temperature at 600℃and sintering time of 10 hours.NFPP@C was used as a cathode material for sodium-ion batteries,paired with metallic sodium(Na)and hard carbon(HC)as the anode materials,to assess its electrochemical sodium storage performance.Within the voltage range of 1.5～4.0 V(vs.Na+/Na),the discharge specific capacities of NFPP@C||Na half cells at 0.1 C and 5 C current densities were 112.2 mAh/g and 96.2 mAh/g,respectively.At 1 C current density,the capacity retention rate after 200 cycles reaches 99.7%.In the voltage range of 1.5～3.5 V(vs.HC)and at 1 C current density,the 3.5 Ah full-cell(i.e.,NFPP@C||HC soft-pack single cell)exhibited excellent long-cycle stability and high-temperature performance,with capacity retentions rates of 92% and 89.1%after 2 800 cycles at 25℃and 45℃,respectively.
Keywords：sodium ion batterycathode materialcarbon coatingNa4Fe3(PO4)2P2O7@Csodium storage performance
Publication Date：2026-02-25
Online Publishing Date：2026-03-13(First online date of this platform, not the publication date of the document)
Pages：7( 17-23 )