On September 16, 2025, SK On announced the completion of a pilot plant for all-solid-state batteries at the Future Technology Research Institute in Yuseong-gu, Daejeon Metropolitan City, South Korea. The pilot production line will primarily supply sample products to customers and conduct systematic evaluation and verification of product quality and performance.
The newly constructed facility spans approximately 4,628 m2. At this pilot line, SK On will focus on developing sulfide-based all-solid-state batteries, with certain sections also dedicated to solid-state lithium metal batteries. The company aims to commercialize all-solid-state batteries by 2029, one year ahead of its original target of 2030.
Currently, SK On’s primary commercialization goal is to develop all-solid-state batteries with an energy density of 800 Wh/L, with a long-term objective of reaching 1,000 Wh/L.
It is reported that SK On has become the first in Korea to apply its self-developed Warm Isostatic Press (WIP) technology at the pilot plant. This next-generation electrode pressing process works by applying uniform isostatic pressure to electrodes at temperatures slightly above room temperature (25~100℃), effectively enhancing electrode density and overall performance.
Although WIP technology significantly reduces battery heat generation and extends cycle life, its conventional application relies on cell packaging processes and is difficult to integrate into continuous automated production lines, limiting production efficiency.
To address this challenge, SK On leveraged innovative battery design and tailored manufacturing processes, combined with conventional pressing methods, to overcome mass-production limitations while preserving the advantages of WIP technology, thereby improving production efficiency.
The completion ceremony for the all-solid-state battery pilot plant was held on September 15. Attendees included SK On President Lee Seok-hee, Future Technology Research Institute Director Park Ki-soo, and Andreas Maier, Head of Solid Power Korea. SK On stated that it has been continuously collaborating with Solid Power on joint research and development of all-solid-state batteries since the two companies established a strategic partnership last year.
Lee Seok-hee, stated, “The completion of this pilot facility for all-solid-state batteries represents a critical foundation for SK On to become a company capable of sustainable and stable growth amid any market conditions.” He emphasized, “We will strive to pioneer the global commercialization of all-solid-state batteries, thereby accelerating the arrival of the era of electrification.”
Source: WeChat Official Account——马里亚纳锂电
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