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In Situ X-Ray Diffraction and Alkali Ion (A = Li, Na, K) Intercalation Behavior of Na2FeP2O7 Pyrophosphate

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Recent Research Trends in Energy Storage Devices

Abstract

Among polyanionic materials, Na2FeP2O7 system has attracted much attention towards large-scale economic sodium-ion battery applications. High thermal stability, facile Na-ion migration, and high operational stability has made this system a suitable subject to explore Li-ion and K-ion intercalation into the pyrophosphate host matrix. Pyrophosphate (P2O7)4− anion offers better safety than other phosphate-based cathodes. Further, Fe-based systems are less hazardous and safer electrode materials and can offer a new class of cathode materials for Li-ion and K-ion battery applications. Excellent electrochemistry of triclinic Na2FeP2O7 structure (space group: \(P\bar{1}\)) has been studied using in situ XRD for few cycles tested against Na-ion intercalation (vs. Na/Na+), which clearly supports and demonstrates the expansion and contraction of the structure during Fe3+/Fe2+ redox process.

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Acknowledgements

The authors thank Shell Technology Centre (STC) Bangalore for financial support. Also, RG acknowledges the University Grants Commission (UGC) for financial support. SS and SPV thanks to Ministry of Human Resource Development (MHRD) for financial support.

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Correspondence to Ritambhara Gond .

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Gond, R., Singh, S., Vanam, S.P., Pralong, V., Barpanda, P. (2021). In Situ X-Ray Diffraction and Alkali Ion (A = Li, Na, K) Intercalation Behavior of Na2FeP2O7 Pyrophosphate. In: Sharma, Y., Varma, G.D., Mukhopadhyay, A., Thangadurai, V. (eds) Recent Research Trends in Energy Storage Devices. Springer, Singapore. https://doi.org/10.1007/978-981-15-6394-2_15

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  • DOI: https://doi.org/10.1007/978-981-15-6394-2_15

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