Construction initiated for trial facility specializing in solid-state battery development
SK On, a leading Korean battery manufacturer, has made a significant stride in the development of solid-state batteries. The company's pilot plant, spanning approximately 4,600 square meters at the SK On Institute of Future Technology in Daejeon, is dedicated to the development of sulfide-based cells and lithium metal batteries.
The extended cycle life of SK On's sulfide-based solid-state cells is a new achievement in the company's battery development. This extended cycle life, a key factor in the long-term performance and reliability of the batteries, was achieved by adding a protective layer to lithium metal anodes.
This novel approach, part of SK On's ongoing research and collaboration efforts, has been in partnership with Solid Power, a US company in the field of solid-state batteries, since 2022. The collaboration aims to accelerate the development and commercialization of all-solid-state batteries (ASSBs).
In 2025, SK On, in collaboration with Hanyang University, reported the significant extension of the cycle life of sulfide-based solid-state cells. This collaboration marked a crucial step towards the commercialization of high-performance solid-state batteries.
SK On's proprietary manufacturing technology does not require the complex and difficult-to-integrate warm isostatic pressing (WIP) process, setting it apart from traditional methods. By combining material mixing, electrode design, and optimized pressing conditions, SK On aims to achieve the same advantages as the WIP method without its limitations.
In the long term, SK On plans to increase the energy density of its cells to 1,000 watt-hours per liter. Currently, the company's goal is to produce cells with an energy density of 800 watt-hours per liter.
The extended cycle life of SK On's sulfide-based solid-state cells is a step towards the commercialization of high-performance solid-state batteries. As the race for the development of next-generation batteries continues, SK On is poised to make a significant impact in the industry.
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