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Abstract :
[en] Sodium-based electrode materials attract a lot of interest as an alternative to lithium-based materials for large-scale energy storage applications, due to the large natural abundance and lower cost of sodium. In recent years, fluorophosphates with the NASICON (Na Super-Ionic Conductor) type structure were studied as cathode electrode materials, because they exhibit rich chemistry, attractive lithium/sodium insertion properties and thus offer promising electrochemical properties [1]. Among them, Na3V2(PO4)2F3 (NVPF) deserves attention because of promising electrochemical properties and favorable characteristics. The inductive effects of both PO43- and F- allow for a high working potential combined with a high theoretical specific capacity due to the multiple oxidation states of vanadium[1-2].
NVPF and NVPF/carbon composite powders were synthesized by spray-drying method with conditions mentioned in our previous work [2]. Spray drying is a cost-effective and easily up-scalable route to prepare homogeneous multi-component powders, thus making it a suitable method to incorporate carbon in the composite powder. We used different carbon sources like (Carbon Black, MWCNTs and GO) to prepare the NVPF/carbon composite powders.
The samples were characterized by XRD, SEM and Galvanostatic charge-discharge cycling in order to understand the influence of carbon source on structure, morphology, reaction mechanism and most importantly electrochemical performance of NVPF and NVPF/carbon composite powders in Na-ion batteries.
References:
[1] R. a. Shakoor et al, Mater. Chem. 22 (2012) 20535–20541, doi: 10.1039/c2jm33862a.
[2] N. Eshraghi et al, Electrochimica Acta, 228, (2017), 319-324, doi: 10.1016/j.electacta.2017.01.026.
[3] A. Mahmoud et al, (2017). J Solid State Electrochem. doi: 10.1007/s10008-017-3717-x.
