A new battery design strategy developed by researchers in South Korea could help solve one of the biggest challenges facing electric vehicles: how to charge batteries much faster without sacrificing safety or battery life.
As electric vehicles, portable electronics, and renewable energy systems become more common, demand is growing for lithium-ion batteries that can recharge in just a few minutes.
However, charging current batteries too quickly creates serious problems.
One of the biggest is the formation of metallic lithium on the battery’s anode, a process known as lithium plating.
This unwanted lithium build-up reduces battery performance, shortens battery life, and in severe cases can lead to overheating or even dangerous battery failures.
To reduce this risk, scientists have been searching for better materials for battery anodes. High-voltage anode materials have attracted attention because they are less likely to develop lithium plating and form more stable protective layers during charging.
Unfortunately, many of these materials have their own weaknesses, including slow movement of lithium ions and poor long-term performance under demanding conditions.
A research team led by Associate Professor Dongwook Han from Seoul National University of Science and Technology has now developed a new way to overcome these limitations. Their findings were published in the journal Advanced Functional Materials.
The team focused on a material called lithium titanium phosphate, which has a crystal structure known as NASICON. This structure is already well known for being highly stable, resisting heat, and allowing lithium ions to move through it efficiently.
Instead of changing the entire material, the researchers slightly adjusted its chemical composition by increasing the amount of phosphorus compared with titanium. This “off-stoichiometric” design caused tiny regions of titanium phosphate to naturally form near the surface of each particle.
These surface regions turned out to be extremely important. They created easier pathways for lithium ions to enter and leave the anode during charging, reducing the energy needed for ion movement. At the same time, the new surface structure remained flexible enough to absorb the tiny expansions and contractions that occur as the battery charges and discharges, helping prevent permanent damage.
The improvements were impressive. During fast-charging tests, the newly designed anode retained about 86% of its original capacity even when charged at a very demanding rate of 10C, meaning the battery could theoretically be fully charged in around six minutes. By comparison, the conventional version of the material lost much more of its capacity under the same conditions.
The new material also maintained strong performance after more than 250 charge-discharge cycles. When combined with high-voltage cathodes in complete battery cells, it continued to show excellent fast-charging ability and broad compatibility.
The researchers believe their approach could be applied beyond today’s lithium-ion batteries, including future all-solid-state batteries.
If successful, it could help make electric vehicles more practical by allowing much shorter charging times while improving safety, battery durability, and the reliability of energy storage systems that support renewable power.
