Abstract
Exploring soft-chemistry synthesis of Fe-based battery cathode materials, we have optimized combustion synthesis as an ultra-rapid approach to produce Na2FePO4F fluorophosphate cathode. It yields nanoscale, carbon-coated target product by annealing (at 600 °C) for just 1 min. The purity of the material crystallizing in the orthorhombic structure was confirmed by powder X-ray diffraction pattern and XPS analysis, while the morphology was studied by scanning electron microscopy. The as-synthesized material exhibits good electrochemical performance delivering a first discharge capacity of more than 70 mAh/g at C/10 rate versus both Li+/Li and Na+/Na, hence acting as an efficient host for both Li-ion and Na-ion insertion. Combustion synthesis can be employed as an economic route for synthesis and rapid screening of various phosphate-based insertion materials.
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Acknowledgements
The first author thanks the University Paris Sud/University Paris-Saclay (France) for a 3-month internship. PB thanks the Department of Atomic Energy (DAE) for a DAE-BRNS Young Scientists Research Award (YSRA). The authors acknowledge Lotfi Bessais, Diana Dragoe, Eric Riviere, and Rita Baddour-Hadjean for their kind help with Mössbauer, XPS, magnetic, and Raman measurements, respectively. Crystalline structure was illustrated using the VESTA software [20].
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The first author thanks the Ministry of Human Resource Development (Govt. of India) for financial support.
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Sharma, L., Bhatia, A., Assaud, L. et al. Ultra-rapid combustion synthesis of Na2FePO4F fluorophosphate host for Li-ion and Na-ion insertion. Ionics 24, 2187–2192 (2018). https://doi.org/10.1007/s11581-017-2376-3
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DOI: https://doi.org/10.1007/s11581-017-2376-3