Allu, Amarnath R. and Haque, Sinorul and Mandal, Indrajeet and K. , Jayanthi and Pal, Prabir and Sen, Prince and Pradhan, Bijay Laxmi and Dey, Krishna K. and Ghosh, Manasi and Gosvami, Nitya Nand and N. M. , Anoop Krishnan and Mir , Wasim Raja (2025) Water-In-Glass: A Self-Supporting Inorganic Aqueous Electrolyte. ACS Materials Letters, 129 (36). pp. 9240-9248. ISSN 26394979

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Abstract

Aqueous rechargeable sodium-ion batteries (ARNIBs) are emerging as cost-effective and safe candidates for large-scale energy storage applications. However, their advancement has been constrained by the narrow electrochemical stability window (ESW) of conventional aqueous electrolytes (1.23 V). Here, we present a transformative approach using an inexpensive and rapidly dissolvable inorganic glass material, water glass (W-glass), to significantly enhance the ESW and enable the development of solid-state, self-supporting aqueous film (SSA-film) electrolytes. These SSA-film electrolytes exhibit an extended ESW of up to 3.5 V and a conductivity of ~10-4 S/cm at room temperature. Structural analysis using magic angle spinning (MAS) nuclear magnetic resonance (NMR) and solution-state NMR reveals that the dissolution of W-glass in water is driven by interdependent hydrolysis of P–O–P linkages and Na⁺–H⁺ ion exchange.This work offers a cost-effective and scalable solution for advancing high-performance ARNIB technology, addressing critical barriers to commercial adoption.

Item Type:	Article
Subjects:	Glass Engineering Materials
Divisions:	Fuel Cell and Battery
Depositing User:	Ms Upasana Sahu
Date Deposited:	12 May 2026 16:47
Last Modified:	12 May 2026 16:47
URI:	https://cgcri.csircentral.net/id/eprint/5744

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