SK On has announced significant breakthroughs in solid-state battery technology, highlighting its adoption of photonic sintering, a process leveraging intense light energy to create solid electrolytes. This method, commonly employed in printed circuit board production, has been successfully adapted for next-generation batteries, enabling faster, cost-effective manufacturing with improved cycle life.
Collaborating with the Korea Institute of Ceramic Engineering and Technology, SK On developed hybrid electrolytes by combining oxide-based materials with gel polymers through photonic sintering. This innovative approach eliminates the need for high-temperature heat treatment—traditionally over 1,000°C for more than 10 hours—while addressing challenges like brittleness and scalability. Experimental results confirmed that batteries using this hybrid electrolyte demonstrated superior durability and uniform microstructure, achieved through the optimization of inorganic dyes to enhance light energy absorption.
In a related study, SK On and Seoul National University explored lithium- and manganese-rich layered oxide (LMRO) cathodes for sulphide-based solid-state batteries. These manganese-rich materials offer a cost advantage over nickel and cobalt but have faced issues such as gas generation and capacity loss in liquid electrolyte systems. The team addressed these challenges by developing a specialized coating to suppress oxygen release during charging, significantly enhancing battery performance and longevity.
“These achievements reflect SK On’s relentless focus on R&D and collaboration with academic institutions,” said Kisoo Park, Head of SK On’s R&D Division. “We are committed to leading innovation in the next-generation battery sector.”
SK On is advancing two solid-state battery variants—a polymer-oxide composite and a sulphide-based model—with pilot plant operations set to begin in Daejeon in late 2025. Commercial prototypes are targeted for release in 2027 and 2029, respectively. The company has also applied for patents globally to safeguard its technological developments.
Last summer, SK On announced a solid polymer electrolyte for lithium metal batteries capable of operating at room temperature, further cementing its position as a leader in battery innovation.
