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Iron-Based Mixed Phosphate Na4Fe3(PO4)2P2O7 Thin Films for Sodium-Ion Microbatteries

Senthil Kumar, B and Rambabu, A and Murugesan, C and Krupanidhi, SB and Barpanda, P (2020) Iron-Based Mixed Phosphate Na4Fe3(PO4)2P2O7 Thin Films for Sodium-Ion Microbatteries. In: ACS Omega, 5 (13). pp. 7219-7224.

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Official URL: https://doi.org/10.1021/acsomega.9b03835


Iron-based polyanionic materials can be exploited to realize low cost, durable, and safe cathodes for both bulk and thin film sodium-ion batteries. Herein, we report pulsed laser deposited mixed phosphate Na4Fe3(PO4)2P2O7 as a positive electrode for thin film sodium-ion microbatteries. The bulk material and thin films of Na4Fe3(PO4)2P2O7 are employed by solution combustion synthesis (SCS) and the pulsed laser deposition (PLD) technique, respectively. Phase purity and the nature of the crystallinity of the thin films were confirmed by grazing incidence X-ray diffraction and transmission electron microscopy. Identification of surface roughness and morphology was obtained from atomic force microscopy and scanning electron microscopy, respectively. Emerging electrochemical properties were observed from charge-discharge profiles of the thin films, which are well comparable to bulk material properties. The Na4Fe3(PO4)2P2O7 thin film electrodes delivered a highly reversible Na+ storage capacity of �120 mAh g-1 with an excellent stability of over 500 cycles. Electrochemical analysis results revealed that the thickness of the film affects the storage capacity. © 2020 American Chemical Society.

Item Type: Journal Article
Publication: ACS Omega
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 15 Apr 2021 11:51
Last Modified: 15 Apr 2021 11:51
URI: http://eprints.iisc.ac.in/id/eprint/65131

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