A Triple-Layer Battery Resistant to Fire and Explosion

The lithium metal battery uses a “triple-layer solid polymer electrolyte” that offers greatly enhanced fire safety and an extended lifespan.

April 1, 2025

Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea

The research team has developed a stable, efficient polymer-based solid electrolyte, which is applicable to smartphones, EVs, and energy storage. (Image: Daegu Gyeongbuk Institute of Science and Technology)

Conventional solid polymer electrolyte batteries perform poorly due to structural limitations that hinder an optimal electrode contact. This could not eliminate the issue of “dendrites”, where lithium grows in tree-like structures during repeated charging and discharging cycles. Dendrites are a critical issue, as an irregular lithium growth can disrupt battery connections, potentially causing fires and explosions.

The research team, therefore, developed a triple-layer structure for the electrolyte to address such issues. Each layer serves a distinct function, significantly enhancing the battery’s safety and efficiency. This electrolyte incorporates decabromodiphenyl ethane (DBDPE) to prevent fires, zeolite to enhance the electrolyte’s strength, and a high concentration of a lithium salt, lithium bis(trifluoro-methanesulfonyl)imide (LiTFSI), to facilitate a rapid movement of lithium ions.

The triple-layer solid electrolyte features a robust middle layer that boosts the battery’s mechanical strength, while its soft outer surface ensures an excellent electrode contact, facilitating an easy movement of lithium ions. This enables a faster movement of lithium ions, enhancing energy transfer rates and effectively preventing dendrite formation.

The experiment showed that the battery developed by the research team retained about 87.9 percent of its performance after 1000 charging and discharging cycles, demonstrating a notable improvement in durability compared with traditional batteries, which typically maintain 70-80 percent of their performance. It can also extinguish itself in a fire, thus significantly reducing the fire risk. This battery is expected to be applicable across various sectors, ranging from small devices like smartphones and wearables to electric vehicles and large-scale energy storage systems.

“This research is anticipated to make a significant contribution to the commercialization of lithium metal batteries using solid polymer electrolytes, while providing enhanced stability and efficiency to energy storage devices,” said Dr. Kim.

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