Synthesis of Na2FePO4F/C as cathode materials for sodium ion batteries with different solvents

Progress on Fe‐Based Polyanionic Oxide Cathodes Materials toward Grid‐Scale Energy Storage for Sodium‐Ion Batteries

“…synthesized NFPF‐H, NFPF‐EG, and NFPF‐PEG with different microstructures by hydrothermal reaction and carbon coating process, and then employed them in sodium‐ion batteries. The electrochemical performance of NFPF‐EG prepared with 30% ethylene glycol solvent showed a superior capacity of 112.3 mAh g –1 at 0.1 C, 65.9 mAh g –1 at 5 C, and 93.2% capacity retention after 200 cycles at 1 C. [ 210 ] Ion doping is another effective method to improve the performance. Jin et al.…”

“…Liu et al synthesized NFPF-H, NFPF-EG, and NFPF-PEG with different microstructures by hydrothermal reaction and carbon coating process, and then employed them in sodium-ion batteries. The electrochemical performance of NFPF-EG prepared with 30% ethylene glycol solvent showed a superior capacity of 112.3 mAh g -1 at 0.1 C, 65.9 mAh g -1 at 5 C, and 93.2% capacity retention after 200 cycles at 1 C. [210] Ion doping is another effective method to improve the performance. [211] An unexpected rate performance can be obtained by bringing elemental aluminum and metal-organic frameworks (MOFs) carbon into Na 2 FePO 4 F, where the capacity of Na 1.94 Fe 0.94 Al 0.06 PO 4 F/MOF-C only decreased from 115.2 mAh g -1 to 63.2 mAh g -1 at a fluctuant rate range from 0.1 C to 5 C. [212] In brief, the current optimization of Na 2 FePO 4 F has mainly concentrated on improving the reversible capacity through carbon decoration and structure design.…”

Phosphate-based cathode materials to boost the electrochemical performance of sodium-ion batteries

“…121 Shao et al synthesized NFPF/C electrode vitamin C as a carbon source, which showed a specic capacity of 117 mA h g À1 at 0.1C with capacity retention of about 85% even over 1000 cycles at 4C. 122,123 Even NFPF/C and the reduced graphene oxide composite showed a good specic capacity of approximately 110 mA h g À1 at 0.1C and cycle stability of 70% aer 5000 cycles at 10C. 124,125 In general, due to the lower mass of NFP, a specic capacity of NFP is higher than that of the NFPF.…”