Mitsui Kinzoku and Factorial Partner to Scale Solid-State Battery Production

Key Facts

1Mitsui Kinzoku signed a Joint Development Agreement with Factorial to scale up the Solstice all-solid-state battery platform.

In a move reflecting the global race for next-generation electric vehicle technology, Mitsui Kinzoku has announced a strategic partnership with Factorial. The two companies signed a Joint Development Agreement to scale up the Solstice all-solid-state battery platform. This collaboration aims to leverage Mitsui Kinzoku's foundational solid-state electrolyte technology to accelerate the manufacturing and commercialization of these advanced batteries.

This agreement positions Mitsui Kinzoku, a leading producer of sulfide-based solid electrolytes, at the forefront of high-growth EV technology. Per market data, Mitsui Kinzoku (5706.T) shares stood at 22,760 JPY at the close of September 16, 2026, having reached a day high of 22,830 JPY. The partnership combines Mitsui's materials science expertise with Factorial’s innovative platform to meet industry-wide demand.

Looking ahead, the focus remains on the industrialization of the Solstice platform for passenger vehicle applications. Based on price levels at the close of September 16, 2026, the stock maintains a support level near its daily low of 22,160 JPY. Investors will be watching for further technical milestones in this joint development as a key catalyst for long-term growth in the non-ferrous metals and battery sectors.