The latest 'proton battery' developed by RMIT University holds the potential to revolutionise power supply for homes, vehicles, and devices without the disposal-related environmental challenges posed by lithium-ion batteries.
The battery works by using a carbon electrode to store hydrogen that has been separated from water, functioning like a hydrogen fuel cell to generate electricity.
Currently, RMIT is launching a two-year research collaboration with the Italy-based automotive component supplier, Eldor Corporation, to refine further and prototype this technology. The relationship with Eldor isn't new as the two entities have worked together on this project for the past five years.
RMIT Professor John Andrews, who headed up the research, said that recent enhancements to the proton battery design are rendering it a competitive, carbon-neutral substitute to lithium-ion batteries.
“As the world shifts to intermittent renewable energy to achieve net zero greenhouse emissions, additional storage options that are efficient, cheap, safe, and have secure supply chains will be in high demand,” Prof Andrews said in an RMIT University statement.
“That’s where this proton battery – which is a very equitable and safe technology – could have real value and why we are keen to continue developing it into a viable commercial alternative.
“There are also no end-of-life environmental challenges with a proton battery since all components and materials can be rejuvenated, reused or recycled.”
An alternative to scarce rare Earth mineral-based batteries
Dr Shahin Heidari, left, and Dr Seyed Niya with the proton battery operating two small fans in the RMIT lab.
The team has effectively demonstrated the operational capability of the proton battery by powering several small fans and a light for a duration of a few minutes.
“Our battery has an energy-per-unit mass already comparable with commercially available lithium-ion batteries, while being much safer and better for the planet in terms of taking less resources out of the ground,” said Prof Andrews.
“Our battery is also potentially capable of very fast charging.
“The main resource used in our proton battery is carbon, which is abundant, available in all countries and cheap compared to the resources needed for other types of rechargeable battery such as lithium, cobalt and vanadium.”
Battery resembles a hydrogen fuel cell
The charging process of the proton battery involves splitting water molecules to produce protons that bond with a carbon electrode. According to Prof Andrews, this method bypasses the energy-consuming steps of storing hydrogen gas under high pressure and subsequently splitting these gas molecules again in fuel cells.
During discharge, the protons are released from the carbon electrode and combine with air oxygen to form water, generating power.
“Our proton battery has much lower losses than conventional hydrogen systems, making it directly comparable to lithium-ion batteries in terms of energy efficiency,” said Prof Andrews.
The battery is described in a paper in the Journal of Power Sources.