Eco-Friendly Solid Electrolyte Revolutionizes All-Solid-State Batteries


A team of scientists from UNIST has made a breakthrough in all-solid-state batteries. They’ve developed an eco-friendly solid electrolyte from Prussian Blue analogs (PBAs). This innovative research addresses cost and environmental concerns, accelerating the commercialization of all-solid-state secondary batteries.

Role of Solid Electrolytes

Solid electrolytes are crucial in all-solid-state batteries. Traditional options, however, face high costs and environmental limitations. The team, led by Professors Hyun-Wook Lee and Sung-Kyun Jung from UNIST, and Professor Dong-Hwa Seo from KAIST, used PBAs as a solid electrolyte. This offers an economical and environmentally friendly alternative.

Prussian Blue Analogs as Solid Electrolytes

PBAs, known for their use as blue dye materials since the 18th century, have emerged as a promising candidate for solid electrolytes. They have wide ion conduction channels and are easy to synthesize. The research team found that PBAs’ inherent properties could enhance ionic conductivity. Different transition metals influence the size of the ion channels, affecting conductivity.

Development of All-Solid Sodium Secondary Battery

The team developed an all-solid sodium secondary battery using manganese-based Prussian blue-based materials. The battery demonstrated remarkable sodium ion conductivity of 0.1 mS/cm at room temperature, showcasing the potential of PBAs as solid electrolytes.


The use of eco-friendly Prussian blue-based materials as solid electrolytes presents a new perspective for the future of solid electrolytes. This research addresses the challenges of high prices and environmental concerns associated with existing solid electrolytes. It also paves the way for the commercialization of all-solid-state batteries.


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