Probing the Na+/Li+-ions Insertion Mechanism in an Aqueous Mixed-Ion Rechargeable Batteries with NASICON-NaTi2(PO4)3 Anode and Olivine-LiFePO4 Cathode

Venkatesha, A and Seth, D and Varma, RM and Das, S and Agarwal, M and Haider, MA and Bhattacharyya, AJ (2022) Probing the Na+/Li+-ions Insertion Mechanism in an Aqueous Mixed-Ion Rechargeable Batteries with NASICON-NaTi2(PO4)3 Anode and Olivine-LiFePO4 Cathode. In: ChemElectroChem .

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Abstract

Aqueous rechargeable mixed-ion batteries (ARMBs), where two types of ions shuttle between the cathode and anode, are an important alternative to conventional non-aqueous electrolyte-based rechargeable batteries. Herein, we present fundamental insights into the function of an ARMB comprising of NASICON-based sodium titanium phosphate (NaTi2(PO4)3/NTP) and olivine-based lithium iron phosphate (LiFePO4/LFP) employed as the anode and cathode respectively in combination with mixed-ion electrolytes, x-M Li2SO4: y-M Na2SO4 (x+y=1). Electrochemical and ex situ structural studies interestingly reveal a preferential Na+-ion insertion into NTP, despite the presence of two different cations in the electrolyte. This is strongly supported by molecular dynamics simulations, which show a 1–2 orders higher diffusion coefficient for Na+-ion than Li+-ion in NTP. In contrast, co-insertion of Li+ and Na+-ions into LFP takes place when cycled in mixed-ion electrolytes. We also show that batteries with mixed-ion electrolytes perform better than electrolytes with individual cations. © 2022 The Authors.

Item Type:	Journal Article
Publication:	ChemElectroChem
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc.
Keywords:	Anodes; Cathodes; Electrolytes; Iron compounds; Lithium; Lithium compounds; Lithium-ion batteries; Molecular dynamics; Olivine; Positive ions; Sodium sulfate; Titanium compounds, Aqueous electrolyte; Aqueous rechargeable battery; Diffusion coefficient-MD simulation; Ion insertion; Li +; MD simulation; Mixed-ion; Mixed-ion aqueous electrolyte; Nati2(PO4)3 and LiFePO4; Selective ion insertion, Diffusion
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	31 Jan 2023 04:42
Last Modified:	31 Jan 2023 04:42
URI:	https://eprints.iisc.ac.in/id/eprint/79581

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