POSCO Holdings will be working with the Taiwanese all-solid-state battery company Prologium to develop core materials for next-generation secondary batteries, including cathode materials, silicon anode materials, and solid electrolytes for all-solid-state batteries, and set up a global supply system. Prologium, founded in 2006, developed an all-solid-state battery in 2012 and has been selling it to manufacturers of small IT devices as smart watches. The company is also attracting investment from global investors, jointly developing all-solid-state batteries for electric vehicles with major automakers like the Daimler Group of Germany.In conventional secondary batteries, electricity is generated and charged through a liquid electrolyte between the positive and negative electrodes. All-solid-state battery is a next-generation battery using a solid electrolyte instead of the liquid one between the positive and negative electrodes and the separator removed, ensuring safety, and increasing energy density.Meanwhile, POSCO Holdings is securing the competence to develop materials, including high-capacity cathode materials and silicon anode materials applicable to all-solid-state batteries. Earlier this year, it established POSCO JK Solid Solution, a solid electrolyte material manufacturing corporation, to reinforce the capacity for developing next-generation secondary battery materials.