A new breakthrough in electrolyte science could make water-based batteries viable for electric aviation and grid storage. Overcoming long-standing voltage limitations, the process promises safer, scalable, and more environmentally-friendly power storage.
Scientists at the University of Maryland have developed a new type of battery electrolyte that could reshape how energy is stored and used.
The team’s work focuses on aqueous battery systems, which use water as the basis for electrolytes. It aims to overcome long-standing voltage limitations that have kept such batteries from competing with other chemistries.
Traditionally, aqueous electrolytes have been limited by a narrow electrochemical window, restricting their potential to power high-energy applications. The new system extends the reduction potential from 1.3 volts to 0.0 volts, so widening the scope for energy-dense, water-based, long-cycle batteries. A prototype battery using the new electrolyte remained stable after 2,000 cycles, according to findings published in Nature Nanotechnology.
A new approach to electrolyte design
At the core of the development is a membrane-free, bi-layer electrolyte that combines aqueous and organic components. The setup is supported by lithium-friendly ionophores, reduces resistance, and prevents unwanted mixing between layers. As a result, battery performance has improved, and future designs have the potential to be more so.
The work is part of a growing effort to explore alternatives to conventional lithium-ion batteries, many of which rely on flammable or environmentally-taxing materials. In contrast, water-based systems offer a lower risk of fire and pose fewer environmental hazards, making them attractive for sectors that prioritise safety and sustainability.
Wider applications and environmental potential
The research comes at a time when industries are looking for new ways to store and deliver electricity, as some low-carbon and renewable energy sources do not create sustained output. The new system’s expanded voltage window could make aqueous batteries viable for a range of uses, including powering electric aircraft and stabilising renewable-heavy power grids.
Solving a long-standing challenge
One of the major hurdles in aqueous battery design has been the compatibility with common anodes like lithium metal and graphite. The proposed system adjusts the electrolyte’s properties to bridge the gap between aqueous and non-aqueous environments.
This is due in part to the inclusion of ionophores like 12-crown-4 and tetraglyme, which help manage how lithium ions move across the electrolyte layers. The compounds form nanoclusters that keep each side of the battery working inside a stable range.
Next steps in battery development
By addressing the mismatch between aqueous electrolytes and high-energy battery components, this work opens the door to new battery chemistries that prioritise safety and efficiency.
While commercialisation is still in its early stages, the progress demonstrates the rising interest in rethinking battery materials and chemistry. Water-based batteries may still face technical challenges, but developments like this show their limitations are not fixed – and that with continued research, they could play a larger role in the global energy mix.
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