SK On has completed a pilot plant for all-solid-state batteries (ASSBs) at its Institute of Future Technology in Daejeon, South Korea, advancing its goal of commercializing next-generation batteries by 2029.
The 4,600 square-meter facility, officially opened on September 15, will focus on the development of sulfide-based ASSBs and lithium-metal batteries.
The company’s pilot line incorporates an in-house adaptation of the Warm Isostatic Press (WIP) process—known as “WIP-free” technology—which applies uniform pressure to electrodes at moderate temperatures to improve density and performance. While traditional WIP methods can slow automated production due to complex cell-sealing steps, SK On has combined optimized mixing of active materials and conductive additives with refined electrode compositions and pressing conditions. These improvements reduce internal and interfacial resistance, minimize heat generation, enhance ion transport, and extend cycle life.
SK On plans to introduce ASSBs with an initial energy density of 800 Wh/L by 2029, one year ahead of its original timeline, and aims to reach 1,000 Wh/L in the longer term. The pilot plant will produce prototypes and validate their performance and quality, serving as a foundational step before scaling to full-volume manufacturing.
Collaboration remains a key element of SK On’s strategy. Since last year, the company has worked with Solid Power Korea on solid-state battery research. In May, SK On and Hanyang University reported a threefold increase in cycle life for sulfide-based ASSBs by applying a protective-film technology to lithium-metal anodes. Patent applications for these innovations have been filed both domestically and internationally.
By integrating advanced processes and academic partnerships, SK On seeks to position itself at the forefront of solid-state battery commercialization and support the broader electrification of transportation and energy storage systems.
Source: SKinno News
