Australian Zinc-Iodine Battery Breakthrough Could Deliver 60,000 Charge Cycles and Ultra-Fast Charging
Researchers at Flinders University in Australia have reported a major advance in aqueous zinc-iodine battery technology, potentially solving one of the biggest problems that has held these batteries back: poor long-term durability.
The team has developed a prototype battery capable of surviving more than 60,000 charge and discharge cycles, while also supporting extremely fast recharging. Under certain operating conditions, the battery can reportedly reach a full charge in as little as three minutes.
That combination of long lifespan, rapid charging, improved safety, and lower material cost could make zinc-iodine batteries a serious alternative to conventional lithium-ion batteries in the future.
According to the research, the new aqueous zinc-iodine cells operate at around 1.3 to 1.4 volts. Performance varies depending on how the battery is configured. In one setting, the battery delivers around 200 mAh/g over 8,000 cycles with a seven-minute charge time. In another, it provides about 150 mAh/g but extends cycle life dramatically to more than 60,000 cycles.
Even more impressive is the reported degradation rate. The cells lose only about 0.0001% to 0.0003% capacity per cycle, suggesting unusually strong stability for this type of battery chemistry.
The key problem with earlier zinc-iodine batteries was the so-called “shuttle effect.” During operation, polyiodine compounds can move through the battery separator, gradually damaging performance and shortening battery life. This issue has been one of the main reasons aqueous zinc-iodine batteries have remained limited in practical use.
To address this, the researchers created a cage-like molecular structure using cyclodextrin. Cyclodextrin is a low-cost polymer derived from starch and is already used in products such as food and cosmetics. Its structure makes it especially useful for this battery design: the outside attracts water, while the inside repels water, allowing it to trap and release troublesome polyiodides when needed.
This helps keep the active battery materials under control, reducing unwanted chemical movement and dramatically improving cycling stability.
The breakthrough is important because zinc-based batteries offer several advantages over lithium-ion technology. Zinc is widely available, comparatively inexpensive, and far safer in water-based battery systems. Aqueous zinc batteries are also far less prone to fire risks than many lithium-based batteries, making them attractive for energy storage systems, consumer electronics, and potentially even larger-scale applications.
The research also highlights a major strategic opportunity for Australia. The country holds an estimated 20% to 28% of the world’s known zinc reserves, giving it a strong position if zinc battery technology becomes commercially viable. This could help reduce reliance on lithium-ion supply chains, which are currently heavily concentrated in a small number of global markets.
Battery waste is another growing concern. Australia currently produces about 3,300 tonnes of lithium battery waste each year, and that figure is expected to rise sharply to more than 136,000 tonnes by 2036. A safer, more sustainable, and easier-to-source battery chemistry could help reduce the environmental pressure created by the rapid growth of rechargeable devices, electric vehicles, and grid storage systems.
For now, the technology is still at the prototype stage. The Flinders University team says it is working with industry partners to develop a prototyping platform, but commercial production is not guaranteed yet.
Turning this zinc-iodine battery breakthrough into a real-world product will require more than strong lab results. It will depend on manufacturing investment, scalable production methods, market demand, and whether companies are willing to support a new battery supply chain.
Still, the findings mark a promising step forward for next-generation energy storage. If the technology can be scaled successfully, aqueous zinc-iodine batteries could offer a safer, faster-charging, longer-lasting, and more affordable alternative to today’s lithium-ion batteries.
