A new battery design approach developed by researchers in South Korea may address one of the biggest hurdles facing electric vehicles: how to charge batteries significantly faster without compromising safety or battery lifespan.
As the popularity of electric vehicles, portable electronics, and renewable energy systems grows, so does the need for lithium-ion batteries that can recharge in just minutes.
However, rapid charging introduces serious complications. One major issue is the formation of metallic lithium on the battery’s anode—a process known as lithium plating. This unwanted lithium buildup hampers battery performance, shortens its lifespan, and in extreme cases, can cause overheating or dangerous failures.
To mitigate these risks, scientists have been exploring better materials for battery anodes. High-voltage anode materials have gained attention because they are less prone to lithium plating and can develop more stable protective layers during charging. Unfortunately, many of these materials have drawbacks such as sluggish lithium-ion movement and poor long-term stability under tough operating conditions.
A research team led by Associate Professor Dongwook Han from Seoul National University of Science and Technology has now devised a solution to these limitations. Their research was published in the journal Advanced Functional Materials.
The team concentrated on a material called lithium titanium phosphate, which features a NASICON crystal structure widely recognized for its stability, heat resistance, and high ionic conductivity. Instead of altering the entire material, the researchers made a subtle chemical adjustment by increasing the phosphorus content relative to titanium—creating an “off-stoichiometric” composition.
This slight modification led to the formation of tiny titanium phosphate regions near the surface of each particle. These surface areas proved crucial because they provided more accessible pathways for lithium ions during charging, reducing the energy barrier for ion movement. Additionally, this surface structure remained flexible enough to accommodate the slight expansions and contractions associated with battery cycling, helping prevent permanent damage.
The results were striking. During fast-charging tests, the newly engineered anode retained about 86% of its initial capacity even when charged at a demanding rate of 10C—meaning a full charge in approximately six minutes. In comparison, traditional versions of the material experienced more significant capacity loss under the same conditions.
Furthermore, the new material demonstrated excellent durability, maintaining performance over 250 charge-and-discharge cycles. When paired with high-voltage cathodes in complete battery cells, it continued to deliver outstanding fast-charging capabilities and broad compatibility.
The researchers believe their strategy could extend beyond current lithium-ion batteries, potentially benefiting next-generation all-solid-state batteries. If successfully implemented, this advancement could make electric vehicles more practical by drastically reducing charging times, while also enhancing safety, longevity, and the overall reliability of energy storage systems that power renewable energy sources.