University research team develops highly stable long-life secondary battery materials for EVs and ESSs

By Park Sae-jin Posted : December 6, 2022, 16:29 Updated : December 6, 2022, 17:00

[Courtesy of Sungkyunkwan University]

SEOUL -- A university research team has developed highly stable and high-capacity secondary battery materials that are ideal for high-performance devices such as electric vehicles and energy storage systems. Instead of lithium, the research team used zinc-aluminum alloy and a hybrid aluminum-ion solution for electrolytes.
Normally, high-performance batteries are mainly made of lithium and a liquid electrolyte. Because lithium is an expensive and volatile metal, all lithium-ion batteries expose the danger of combustion. However, rare metals are favored because of their high energy density. Water-based electrolytes are cheap to make and have high ion transfer rates but their drawback is hydrogen gas diffusion and layer passivation.
According to the National Research Foundation, a research team led by Sungkyunkwan University Professor Park Ho-seok has developed new materials for anodes and electrolytes. Researchers first created the aluminum-ion electrolyte and developed zinc-aluminum alloy anodes to trigger highly reversible metal alloy phase changes.
Through tests, researchers found that zinc-aluminum alloy anodes had a lifespan of more than seven thousand hours, which is much longer than that of conventional anodes made of other materials including zinc, aluminum, and other alloys. "This research has a great meaning as we were able to acquire core technology to solve issues commonly experienced by lithium-ion batteries like the stability and price while increasing the total energy density," Park said in a statement on December 6. 
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