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Al-Doping Enables Low-Cost Preparation of High-Performance Na2FePO4F/C Using Commercial FePO4
Wenxin Xia1,2,3, Huan Ye1,2,3, Guoxing Ren1,2,3
1Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou 450001, China.
Abstract:
Na2FePO4F (NFPF) is a promising cathode material for sodium-ion batteries, yet it is still confronted with a cost-performance trade-off. In this study, a low-cost preparation method of high-performance NFPF cathode materials was proposed via an Al-doping strategy, using commercial FePO4 without premodification. The effect of the Al content on the crystal structure, sodium-ion diffusion kinetics, and electrochemical performance of NFPF was investigated in detail. X-ray diffraction and Rietveld refinements confirmed the high-purity phase. Na1.98Fe0.98Al0.02PO4F/C (NFPF-Al0.02) showed an excellent rate capability (57.7 vs 44.5 mAh·g-1 at 5.0 C) and better cycling stability (93.6% vs 66.7% after 100 cycles at 0.5 C) than the undoped NFPF sample. NFPF-Al0.02 also exhibited an excellent capacity retention of 84.6% after 1000 cycles at 5.0 C. GITT, CV, and EIS results revealed an order-of-magnitude increase in the sodium-ion diffusion coefficient of Al-doped NFPF-Al0.02 compared to that of pristine NFPF. A cost-performance comparison between this work and previous studies was conducted. In summary, this innovative method, which can produce high-performance NFPF cathode materials at low cost, is anticipated to significantly promote the commercialization of NFPF-based sodium-ion batteries.
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