LG Energy Solution Demonstrates Sulfur Cathode Technology for All-Solid-State Batteries

LG Energy Solution announced today that it has successfully demonstrated a high-capacity battery utilizing sulfur as a cathode material through an all-solid-state battery architecture, presenting new possibilities for next-generation, high-energy-density batteries.
The research, conducted in collaboration with Professor Shirley Meng’s research team at the University of Chicago, was published on February 27 in ITALICS, a leading international journal in the field of energy research.
The study represents a key research achievement by the Frontier Research Lab (FRL), jointly operated by LG Energy Solution with the University of California, San Diego (UC San Diego) and the Pritzker School of Molecular Engineering at the University of Chicago.

Sulfur has long been considered a promising candidate for next-generation cathode materials due to its low cost, abundant availability, and exceptionally high theoretical capacity of approximately 1,675 mAh/g. However, conventional battery systems using liquid electrolytes have faced a major challenge known as polysulfide dissolution, in which sulfur compounds generated during charge and discharge processes dissolve into the electrolytes, leading to rapid performance degradation and limited cycle life.
To address this issue, the joint research team adopted an all-solid-state battery structure that replaces liquid electrolytes with solid electrolytes. This approach effectively suppresses polysulfide dissolution and enables stable electrochemical performance.
As a result, the researchers achieved a capacity of approximately 1,500 mAh/g, while maintaining stable cycling performance. Importantly, the performance was verified not only in coin-cell testing but also in pouch-type cell configurations, thereby demonstrating the potential for practical battery applications.
“This achievement confirms the potential of sulfur cathodes to expand energy capacity beyond conventional lithium-ion batteries,” commented an LG Energy Solution representative. “Through continued collaboration with leading academic institutions, we will further advance next-generation battery technologies by strengthening safety, energy density, and cost competitiveness.”
Professor Shirley Meng, who led the research, delivered an address during The Battery Conference at InterBattery 2026, held at COEX, Seoul, in March 2026, where she shared insights into the future development of all-solid-state batteries and next-generation battery technologies.

 
 
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