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Vol. 36 No. 6 (2024): Vol 36 Issue 6, 2024

Copyright (c) 2024 P. Priyanka, B. Nalini

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A Potential Cathode for Quasi Solid-State Sodium-Ion Batteries with Trivalent Doping of La3+ in Sodium Iron Phosphate

https://doi.org/10.14233/ajchem.2024.31662
P. Priyanka
Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore-641 043, India
B. Nalini
Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore-641 043, India
https://orcid.org/0000-0002-7615-0529

Corresponding Author(s) : B. Nalini

nalinicselvin11@gmail.com

Asian Journal of Chemistry, Vol. 36 No. 6 (2024): Vol 36 Issue 6, 2024

Abstract

In this work, a low cost and environmental friendly cathode material sodium iron phosphate (NaFePO4) has been investigated with trivalent doping of lanthanum (La3+). Maricite phase of NaFePO4 exhibits 154 mAhg-1 theoretical capacity and this phase is said to be electrochemically inactive, hence studies are focussed on enhancing the properties of NaFePO4. Lanthanum exhibits a trivalent state and can be favourable on doping in the Fe site. Hence, an attempt is made to synthesize five different concentrations of La3+ in NaFe1-xLaxPO4 (x = 0.02, 0.04, 0.06, 0.08 and 0.1) of its first kind. An initial discharge capacity of 116 mAhg-1 at a current density of 0.1 Ag-1 has been achieved over 100 cycles when 0.02 concentration of La dopant in NaFePO4 is constructed as cell with NaOH aqueous electrolyte. The La-doped NaFePO4 at 0.02 concentration (NL2) exhibits higher specific capacity and cyclic stability. The initial discharge capacity of 36 mAh g-1 at 0.5 A g-1 was achieved over 500 cycles in the quasi-solid-state sodium battery analysis using a CuS:Sn2Sb3 anode and a PVA-NaOH electrolyte. This study shows a light on trivalent doping of La3+ with different concentrations and their effect as cathode when assembled as full cell for the first time.

Keywords

NaFePO4 Trivalent doping Lanthanum Cathode Quasi solid-state SIBs
Priyanka, P., & Nalini, B. (2024). A Potential Cathode for Quasi Solid-State Sodium-Ion Batteries with Trivalent Doping of La3+ in Sodium Iron Phosphate. Asian Journal of Chemistry, 36(6), 1393–1402. https://doi.org/10.14233/ajchem.2024.31662
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