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. High-voltage anode materials have attracted attention because they are less likely to develop lithium plating and form more stable protective layers during charging. The team focused on a material called lithium titanium phosphate, which has a crystal structure known as NASICON. They created easier pathways for lithium ions to enter and leave the anode during charging, reducing the energy needed for ion movement.