As more countries switch to renewable energy and the demand for electricity continues to grow, scientists are searching for better ways to store large amounts of power.
Reliable energy storage is becoming increasingly important because solar panels and wind turbines do not produce electricity all the time.
Growing electricity use from artificial intelligence data centers is also adding pressure to power grids, creating an even greater need for affordable, long-lasting batteries.
One promising option is the soluble lead flow battery.
Unlike the lithium-ion batteries found in phones and electric cars, flow batteries store energy in liquid electrolytes that move through the system during charging and discharging.
Soluble lead flow batteries have several advantages. They are relatively inexpensive, can be built in large sizes for grid-scale energy storage, and use lead, a material that is already widely recycled through the existing lead-acid battery industry.
Despite these benefits, one major problem has limited their wider use. The battery’s carbon-based electrodes naturally repel water, while the battery’s liquid electrolyte is water-based. Because the liquid has trouble spreading across the electrode surface, the chemical reactions inside the battery occur less efficiently.
This slows charging and discharging and reduces the battery’s overall performance and lifespan.
Researchers at National Taiwan University have now found a simple way to overcome this obstacle. Their study, published in the Journal of Energy Storage, shows that changing only the surface of the electrode can greatly improve how the battery works.
The team coated tiny porous graphite spheres with an extremely thin layer of a special material called a MAX phase, made from titanium, aluminum and carbon. This coating changed the electrode from being water-repelling to water-attracting.
Once the surface became water-friendly, the electrolyte could spread more easily through the tiny pores inside the electrode. This allowed charged particles, known as ions, to move more freely, reducing the bottlenecks that had previously slowed the battery’s chemical reactions.
The improvement was impressive. Batteries fitted with the modified electrodes continued operating for 943 charging and discharging cycles while maintaining high efficiency throughout the testing period. The researchers also built a modular prototype battery to demonstrate that the technology works outside laboratory experiments. The prototype successfully powered LED lights and a small electric fan.
Professor Hsun-Yi Chen, who led the research, said the team achieved a significant increase in battery life simply by redesigning the electrode’s surface instead of changing the entire battery system. This approach could make long-duration energy storage more practical and affordable for large electrical grids.
The researchers also believe the same surface treatment could benefit other types of batteries that face similar challenges with moving liquids and charged particles through their electrodes.
Although more work is needed before the technology reaches commercial use, the study highlights how a small change at the microscopic level can lead to major improvements.
If developed further, this simple coating could help create cheaper, longer-lasting batteries that support renewable energy and provide more reliable electricity for the future.
