Australian Researchers Develop Zinc-Iodine Battery with 3-Minute Charge

A team of researchers at Australia’s Flinders University has created a novel aqueous zinc-iodine battery that could mark a significant advance toward safer, longer-lasting alternatives to current lithium-ion cells used in mobile phones and electronic devices.

How the polymer stabilizes iodine

The innovation centers on an organic polymer derived from cyclodextrin—a sugar-linked compound obtainable from starch. This polymer functions to trap iodine compounds and restrict their migration, addressing a key challenge that previously undermined performance and stability in zinc-iodine batteries.

Ultrafast charging and exceptional cycle life

Experimental results demonstrated strong performance: one configuration sustained over 8,000 charge cycles while retaining a capacity of approximately 205 milliampere-hours per gram, with full charging completed in about seven minutes.

In another configuration, the battery achieved more than 60,000 charge cycles at a capacity of 150 milliampere-hours per gram, while reducing full-charge time to roughly three minutes.

By comparison, some modern foldable smartphones are engineered for around 1,200 charge cycles. Theoretically, reaching 60,000 cycles implies a service life far exceeding the expected operational lifetime of the phone itself—even with daily charging.

Safety and scalability advantages

Zinc-iodine batteries are aqueous and inherently non-flammable, unlike lithium-ion batteries. This characteristic enhances their appeal for large-scale energy storage applications.

Why smartphones won’t adopt this technology soon

Despite these promising metrics, researchers caution that current zinc-iodine batteries exhibit lower volumetric energy density than lithium-ion cells—meaning they require greater physical volume to deliver equivalent capacity.

This presents a fundamental constraint for smartphones, which demand compact, high-density power sources. Additionally, zinc-iodine cells operate at a voltage range of approximately 1.3 to 1.4 volts, whereas lithium-ion batteries function at around 3.7 volts.

As a result, initial deployment is expected in grid-scale and residential energy storage systems—including electricity storage facilities and home solar power setups—rather than consumer mobile devices.

Nonetheless, the findings represent a meaningful step forward in battery chemistry development. Should future work by researchers and engineers succeed in increasing energy density and miniaturizing cell design, the prospect of a smartphone charging fully in minutes and retaining battery health for years would move significantly closer to practical reality.