Mitsui Kinzoku Partners with Factorial to Scale All-Solid-State Battery Manufacturing
Factorial partners with Mitsui Kinzoku to pair Solstice solid-state cells with sulfide electrolyte manufacturing expertise for large-scale deployment.
Rhea-AI Summary
Factorial Energy (FAC) announced a strategic partnership and Joint Development Agreement with Japan-based materials company Mitsui Kinzoku to support industrialization of Factorial’s Solstice™ sulfide-based all-solid-state battery platform.
Mitsui Kinzoku contributes its A-SOLiD™ sulfide solid electrolyte technology and deep materials expertise, including an estimated 90% share of the ultra-thin copper foil market for semiconductors and a dedicated electrolyte plant in Saitama advancing toward mass production. Factorial remains a fabless innovator, leading cell design, process development, supply chain qualification, line integration, and manufacturing validation as it works to scale Solstice™.
The collaboration builds on Factorial’s recent momentum, including a June 2026 Nasdaq listing, strategic investments from IQT and POSCO Future M, first commercial orders in passenger vehicle and aerospace markets, and test results such as a drone flight with 30% longer range and an over 1,200 km automotive drive on a single charge.
Positive
- Joint Development Agreement with Mitsui Kinzoku to industrialize Solstice™ all-solid-state batteries
- Mitsui Kinzoku holds an estimated 90% share of the ultra-thin copper foil market for semiconductors
- Mitsui’s A-SOLiD™ sulfide electrolyte advancing toward mass production at a dedicated Saitama plant
- Solstice™ platform delivers high energy density and improved thermal stability with dry-cathode processing
- Initial drone flight test using Factorial technology achieved 30% longer range in 2026
- Mercedes-Benz road test with Factorial tech exceeded 1,200 km range on a single charge
- Factorial secured its first commercial orders in passenger vehicle and aerospace markets in 2026
- Factorial completed a Nasdaq listing in June 2026 and attracted strategic investment from POSCO Future M and IQT
Negative
- None.
Details
Market reaction after Solstice platform partnership: FAC +13.30%
Following this news, FAC has gained 13.30%, reflecting a significant positive market reaction. Our momentum scanner has triggered 19 alerts so far, indicating notable trading interest and price volatility. The stock is currently trading at $5.67.
Data tracked by StockTitan Argus (15 min delayed). Upgrade to Gold for real-time data.
Key Figures
- Ultra-thin copper foil share
- 90%
- Estimated share of the semiconductor market held by Mitsui Kinzoku
- Drone range improvement
- 30% longer range
- Initial 2026 drone flight test
- Single-charge range
- over 1,200 km
- Mercedes-Benz real-world road testing
Previous Partnership Reports
-
Strategic partnership framework followed flight tests showing over 30% higher drone range
-
Shareholder letter outlined partnerships and a capital-light manufacturing strategy after Nasdaq listing
24h Move is the share-price change in the day after each event; other market factors may also have contributed.
Key Terms
all-solid-state battery technical
solid electrolyte technical
dry-cathode processing technical
joint development agreement financial
AI-generated analysis. How Rhea-AI works. Not financial advice.
- Strategic partnership expected to accelerate global scale up of Factorial's all-solid-state Solstice™ platform
- Mitsui Kinzoku, one of the few companies in the world holding foundational solid-state electrolyte technology, signs Joint Development Agreement to help power the scale up
- The partnership positions Solstice™ at the center of an industry wide push toward commercializing all solid-state batteries.
BOSTON, Sept. 17, 2026 (GLOBE NEWSWIRE) -- Factorial Energy Inc. (“Factorial”) (Nasdaq: FAC), a global leader in solid-state battery technology, today announced a strategic partnership with Mitsui Kinzoku Company, Limited to support the industrialization of its Solstice™ all-solid-state battery platform.
Mitsui Kinzoku is a leading producer of sulfide-based solid electrolytes for all-solid-state batteries, one of few companies worldwide with foundational technology in this space, and already the global leader in ultra-thin copper foil, with an estimated
"I am very pleased that we have been able to enter into this joint development agreement with Factorial," said Dr. Kiyotaka Yasuda, Senior Executive Officer, General Manager, Business Creation Division of Mitsui Kinzoku Company, Limited. "Batteries are a key technology for realizing an electrified society, but significant technical challenges still remain. That is precisely why we believe it is necessary to go beyond the extension of existing technologies and take on the challenge of creating new value. By leveraging Mitsui Kinzoku's long-established expertise in materials and manufacturing technologies and combining it with Factorial's advanced technological capabilities, we aim to accelerate the realization of next-generation batteries."
Factorial remains the fabless innovator across the platform, leading cell design, process development, supply chain qualification, line integration, and manufacturing validation.
“Battery innovation can't be done by one single company," said Siyu Huang, CEO of Factorial. "It's driven by the entire supply chain and, increasingly, by an entire industry coalition. Mitsui Kinzoku's foundational electrolyte technology brings critical materials expertise to our work to move Solstice™ toward commercial deployment. We're not just building a battery. We're building the connective thread that helps the whole industry move forward together.”
As robotics, aerospace systems, and AI-enabled infrastructure ask more of the physical world, energy is fast becoming the defining constraint on what's possible. Factorial calls this the emergence of the energy layer - the battery infrastructure needed to power the next era of mobility, aerospace and physical intelligence. Built for that layer, Solstice™, Factorial's sulfide-based all-solid-state battery platform, delivers high energy density and improved thermal stability, with proprietary dry-cathode processing enabling more cost-effective manufacturing.
This collaboration builds on Factorial's recent momentum, including strategic investments from IQT and POSCO Future M; its first commercial orders for passenger vehicles in January and for aerospace in July; expanded automotive and industrialization partnership programs; and its June 2026 Nasdaq listing under the ticker symbol FAC.
About Factorial Energy
Factorial Energy (Nasdaq: FAC) is a leading American solid-state battery innovator backed by IQT – the not-for-profit strategic investor for the U.S. national security community and America’s allies – and Mercedes-Benz, Stellantis, Hyundai, and Kia. Through its proprietary FEST® and Solstice™ platforms, engineered for scalable manufacturing, Factorial delivers industry-leading performance across aerospace, energy storage and mobility applications. In 2026, Factorial's initial drone flight test achieved
About Mitsui Kinzoku
Mitsui Kinzoku is a Japan-based global materials company and a leading manufacturer of non-ferrous metals and advanced materials, providing innovative solutions primarily for the automotive and electronics industries. Leveraging its core strengths in non-ferrous metals, functional materials, and recycling technologies, the company develops and manufactures a wide range of high-performance products, including automotive components, semiconductor materials, battery materials, and engineered materials. With a strong focus on innovation, environmental responsibility, and resource circulation, Mitsui Kinzoku collaborates with partners around the world to create new value and will continue to contribute to the realization of a sustainable society.
Forward-Looking Statements
Certain statements in this communication may be considered forward-looking statements. Forward-looking statements generally relate to future events or Factorial’s future financial or operating performance, including expectations regarding manufacturing capabilities, commercialization plans, business strategy, customer programs, partnerships, supply-chain development and production readiness. In some cases, forward-looking statements can be identified by terms such as “may,” “should,” “expect,” “intend,” “will,” “estimate,” “anticipate,” “believe,” “predict,” “project,” “target,” “plan,” “potentially” or similar terminology. These statements are subject to risks, uncertainties and other factors that could cause actual results to differ materially from those expressed or implied. Factorial undertakes no obligation to update forward-looking statements except as required by law.
Factorial has used, and intends to continue to use, its Investor Relations website (https://ir.factorialenergy.com), as a means of disclosing material non-public information and for complying with its disclosure obligations under Regulation FD. Information on or that can be accessed through Factorial’s Investor Relations website, or that is contained in any website to which a hyperlink is provided herein is not part of this press release, and the inclusion of Factorial’s Investor Relations website address, and any hyperlinks are only inactive textual references.
Factorial IR Contact:
IR@factorialenergy.com
Factorial Media Contact:
Factorial@antennagroup.com
A photo accompanying this announcement is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/7c718db9-61c2-4ef9-8111-13e68368dabb
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What is the main objective of the Factorial–Mitsui Kinzoku partnership?
The partnership is structured as a Joint Development Agreement aimed at supporting the industrialization and global scale-up of Factorial’s Solstice™ sulfide-based all-solid-state battery platform. Mitsui Kinzoku’s sulfide solid electrolyte technology and manufacturing expertise are intended to help move Solstice™ from development toward commercial deployment.
What roles will Factorial and Mitsui Kinzoku each play in this collaboration?
Factorial remains a fabless innovator and leads cell design, process development, supply chain qualification, line integration, and manufacturing validation for the Solstice™ platform. Mitsui Kinzoku contributes its A-SOLiD™ sulfide solid electrolyte technology and materials manufacturing capabilities, supported by its experience in non-ferrous metals and advanced materials.
Which applications are targeted by Factorial’s Solstice™ and FEST® platforms?
Factorial’s FEST® and Solstice™ solid-state battery platforms are engineered for scalable manufacturing and are used across aerospace, energy storage, and mobility applications. The company highlights emerging needs in mobility, aerospace systems, robotics, AI-enabled infrastructure, and broader physical intelligence as key demand drivers for these platforms.
What recent milestones has Factorial reported beyond this partnership?
Recent milestones include strategic investments from IQT and POSCO Future M, first commercial orders in passenger vehicle and aerospace markets in 2026, an initial drone flight test delivering 30% longer range, and automotive demonstrations such as a Mercedes-Benz test vehicle exceeding 1,200 km of range on a single charge and integration into a Dodge Charger Daytona demonstration vehicle with Stellantis.