LG Energy Solution Implements Sulfur Cathode All-Solid-State Battery, Demonstrates Potential for Next-Generation High-Capacity Batteries

Performance of Approximately 1,500 mAh/g Capacity Verified

LG Energy Solution has demonstrated the potential of next-generation battery technology by implementing a high-capacity battery using sulfur as the cathode material through all-solid-state technology.

A researcher is studying all-solid-state batteries at the Industry-Academia Joint Research Institute operated by LG Energy Solution. Photo by LG Energy Solution

On March 5, LG Energy Solution announced that the results of a joint study with Professor Shirley Meng's research team at the University of Chicago—a world-renowned expert in all-solid-state batteries—were published on February 27 in the international energy journal "Nature Communications."

This research represents a major collaborative achievement from the Frontier Research Lab (FRL), which LG Energy Solution operates in conjunction with UC San Diego (UCSD) and the Pritzker School of Molecular Engineering at the University of Chicago.

The key aspect of the study is that sulfur was applied as the battery cathode material, achieving high energy storage performance. Sulfur has attracted attention as a candidate for next-generation high-capacity cathode materials because it is inexpensive, abundant, and can theoretically deliver a high capacity of about 1,675 mAh/g.

However, in conventional liquid electrolyte-based batteries, the "polysulfide dissolution" phenomenon—where sulfur compounds generated during charge and discharge escape into the electrolyte—causes rapid performance degradation. Despite its high theoretical capacity, this has made it difficult to ensure battery lifespan and stability, limiting commercialization.

To address these issues, the joint research team introduced an all-solid-state battery structure using solid electrolytes instead of liquid electrolytes. This fundamentally blocked the environment in which polysulfide dissolution occurs and succeeded in achieving a capacity of approximately 1,500 mAh/g along with stable cycle performance.

Notably, this performance was not limited to coin cell experiments but was also demonstrated in actual pouch-type cells, verifying that the research results could translate into real-world battery applications.

An LG Energy Solution representative stated, "This research is significant in that it confirmed the potential for greater energy capacity by applying a sulfur cathode, exceeding that of conventional lithium-ion batteries. Based on industry-academic collaboration, we will continue to advance the development of next-generation battery technologies by securing safety, energy density, and cost competitiveness at the same time."

Meanwhile, Professor Shirley Meng, who led this research, is scheduled to present on the advancement of all-solid-state and next-generation battery technologies as a speaker at "The Battery Conference," which will be held during InterBattery 2026 at COEX in Gangnam-gu, Seoul, from March 11 to 13.

This content was produced with the assistance of AI translation services.