Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.332
Publication date: 16th December 2024
Ammonium-ion batteries have emerged as a promising energy storage technology for certain applications, offering advantages such as environmental friendliness, cost efficiency, and abundant resource availability. However, the side reactions originating from electrolytes, such as the water decomposition, and host material dissolution preclude their practical applications. Unlike the traditional metal-based aqueous batteries, the idea of “ultrahigh concentrated electrolyte” is not feasible due to the strong hydrolysis reactions of ammonium ions at high concentration.
Our group has been developing innovative strategies including hydrogen bond engineering, electrolyte engineering, and electrode engineering to overcome the challenges faced by aqueous ammonium-ion batteries. The role of hydrogen bond chemistry in stabilizing ammonium ions and improving ionic transport is particularly important, as it affects both electrode–electrolyte interfaces and bulk electrolyte performance.
In this work, we introduce sucrose molecules as electrolyte additive into the ammonium trifluoromethanesulfonate electrolyte. The quaternary hydrogen bond network is formed among cations (NH4+), anions (OTf-), solvents (H2O) and additives (C12H22O11). Such unique hydrogen bond network can inhibit the water decomposition. More interesting, we found that the weak hydrogen bond coordination of NH4+ ions and sucrose molecules allows faster ion diffusion in the bulk electrolytes. This is a new discovery which is very different from metallic charger carriers used in aqueous batteries.
Utilizing such designed electrolytes, the assembled ammonium full battery shows remarkable cycling stability of 2000 cycles at 20 °C and 10000 cycles at −20 °C, respectively.
We believe this work presents a new electrolyte modulating strategy for advancing the practical potential of aqueous ammonium ion batteries.
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