| Autor: |
Han, Yang, Wang, Xuejie, Yan, Wenxue, Buzlukov, Anton L., Hu, Pei, Zhang, Liuyang, Yu, Jiaguo, Liu, Tao |
| Zdroj: |
ACS Applied Materials & Interfaces; July 2024, Vol. 16 Issue: 27 p35114-35122, 9p |
| Abstrakt: |
The cathode material Na4Fe3(PO4)2P2O7(NFPP) has shown great potential for sodium-ion batteries (SIBs) due to its cost-effectiveness, prolonged cycle life, and high theoretical capacity. However, the practical large-scale production of NFPP is hindered by its poor intrinsic electron conductivity and the presence of a NaFePO4impurity. In this study, we propose a mutually reinforcing approach involving Ti doping, mechanical nano treatment, and in situ carbon coating to produce Ti-NFPP via the solid-state methods of synthesis. Ti doping strengthens the covalent Fe–O interaction, hence accelerating the electron transfer and the redox reactions Fe2+/Fe3+. In situ carbon coating improves electrical conductivity and allows for accommodating the volumetric variation. Nanosized treatment promotes the uniform progression of solid-state reactions. The synthesized Na4Fe2.98Ti0.01(PO4)2P2O7material (Ti-NFPP) exhibits promising electrochemical properties with an initial discharge specific capacity of 112.5 mA h g–1at 0.1 C. A volumetric change of only 2.98% was observed during the de/sodiation process, indicating an enhanced reversibility of the crystal lattice. Moreover, it demonstrates exceptional cycling stability with a capacity retention rate of 97.2 mA h g–1at 10 C over 5000 cycles. These findings offer a promising pathway for the large-scale production of Ti-NFPP in SIBs. |
| Databáze: |
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