Solid State EV Batteries Will Crush The Fossil Fuel Fantasy

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New solid-state EV batteries are making the case for vehicle electrification stronger than ever before, by replacing the traditional liquid electrolyte with higher-performing, less volatile materials. The technology has yet to crack into high-volume commercial production, but the US startup Factorial Energy is among those gearing up for a quick run at acceleration following a long period of R&D, helped along by the growing market for electric drones and robotics in military applications.

Solid-State EV Batteries: The Wait Is Almost Over

CleanTechnica has spilled plenty of ink on solid-state technology over the years. While foundational research continues apace, some innovators in the commercial space are already approaching launch point.

Factorial Energy is a case in point. Activity among commercial solid-state EV battery stakeholders began ramping up around 2022, and Factorial weighed in that year with a $200 million round of private sector funding spearheaded by Mercedes-Benz and Stellantis. Hyundai and Kia have also supported the firm, among others.

Factorial took the next step up the financial strategy ladder last December, when it the hooked up with Cartesian Growth Corporation III, a branch of the US-based global private equity firm Cartesian Capital Group. The two firms announce the creation of a special purpose acquisition company (SPAC) under a definitive business combination agreement.

The agreement enables Factorial to vault itself into an Initial Public Offering with a listing on Nasdaq, the National Association of Securities Dealers Automated Quotations. “The business combination (“Combination”) values Factorial at approximately $1.1 billion on a pre-money, pre-merger basis,” Factorial and Cartesian III explained in a press statement. “The Combination also includes $100 million in new capital committed by institutional investors in a private placement of common stock. Upon closing, the combined company will list on Nasdaq under the ticker symbol FAC.”

“A Nasdaq listing is expected to provide the capital and enhanced visibility to drive commercial adoption of our transformative products,” added Factorial co-founder and CEO Dr. Siyu Huang.

The Drone Effect, Part I

If all goes according to plan, the Factorial–Cartesian III Combination proposal should be wrapped up by mid-year. In the meantime, Factorial is not confining its solid-state EV battery to the conventional territory of street-legal vehicles. The drone market has also emerged as fertile territory, particularly in the defense sector.

Cartesian III Chairman & CEO Peter Yu noted as much in the December SPAC announcement. “Our due diligence ratified that Factorial’s solutions can be transformative not only for marquee automotive partners, but also for critical national security priorities, such as the drone or UAV market,” Yu emphasized.

In the same announcement, Factorial also underscored its interest in emerging markets. “Beyond passenger vehicles, Factorial is expanding into high-growth defense, aerospace, and robotics applications where high power, ability to operate across extreme temperature ranges, and lightweight performance are mission-critical,” the company noted.

The Drone Effect, Part II

Sure enough, in March, Factorial and Cartesian III announced a new investment from the Virginia firm IQT, adding to recent investments by the leading battery supply chain firms Philenergy and POSCO Future M of South Korea. “This funding accelerates Factorial’s expansion in high-growth sectors, including drones and mobile robotics,” Factorial emphasized.

IQT is a not-for-profit strategic investor affiliated with national security interests among the US and its allies. US President Donald Trump has been chipping away at the NATO alliance, which is a whole ‘nother can of worms. Regardless, for the time being, Factorial is focusing itself on developing a “resilient battery ecosystem aligned with trusted allies and secure supply chains.”

“From unmanned aerial vehicles (“UAVs”) to robotics, incremental improvements are no longer sufficient,” emphasized Factorial CEO Siyu Huang, making the case for leapfrogging over conventional lithium-ion batteries.

“Support from IQT, Philenergy, and POSCO Future M accelerates our growth, particularly in the strategic drone segment,” Huang noted, underscoring the drone factor again.

“Factorial’s solid-state batteries deliver high energy density and lightweight performance that dramatically extend operational range in demanding environments. This performance profile positions the Company’s technology as a preferred alternative to conventional lithium-ion solutions where range, weight, and thermal performance are critical,” Factorial added for good measure.

In April, Factorial further underscored its interest in the drone market with the appointment to its Board of Directors of Dr. Dieter Zetsche. Formerly Chairman of the Board of Management of Daimler AG from 2006 to 2019 and an early investor and advisor to Factorial, Dr. Zetsche also took note of the drone market in a press statement announcing his new position.

Making The Solid-State EV Battery Of The Future Happen, Now

As for how Factorial expects to manufacture its new solid state battery at scale sooner rather than later, Philenergy has an answer for that. In February, Factorial and Cartesian III announced a strategic collaboration with Philenergy. The company, not to be confused with the similarly named expo PhilEnergy, spun off from the Korean firm Philoptics in 2022 and maintains operations in the US as well as Hungary and Korea.

Philenergy has yet to surface on the CleanTechnica radar, so now is a good time to catch up. “In the secondary battery manufacturing process, [the company] mainly deals with the stacking process equipment that cuts the polar plates of the cathode and anode by laser notching and stacks the processed taps between the separators,” Philenergy posted on LinkedIn in 2024.

“Philenergy has an outstanding stacking technology than other secondary battery equipment companies, which has increased production efficiency, and its laser notching technology has also stood out by being the first in the industry to supply Samsung SDI with process equipment for mass production lines,” Philenergy elaborated.

That was more than enough to convince Factorial and Cartesian III. “Philenergy’s advanced manufacturing capabilities — including automated laser notching, precision stacking systems, next-generation winding technology, and intelligent assembly infrastructure — represent the cutting edge of battery production engineering,” they enthused in a press statement dated February 26 of this year.

No definitive word yet on applying the new battery to EV manufacturing here in the US, but in February the domestic automaker Karma Automotive announced its intention to launch the “first solid-state battery production program in the United States for passenger vehicles” in partnership with Factorial.

“The collaboration will integrate Factorial’s FEST® solid-state battery technology into Karma’s next-generation vehicle platform, beginning with the all-electric Karma Kaveya super-coupe, a high-performance ultra-luxury super car delivering over 1,000 horsepower and top speed in excess of 200mph which is scheduled to arrive on American roads in late 2027,” Karma noted, with FEST referring to Factorial’s solid-state compatibility product, enabling 80% integration into conventional lithium-ion manufacturing lines.

The two firms announced the news by press release on the media distribution platform BusinessWire.com on February 5. However, as of this writing, the links have been scrubbed from the Karma website. A link exists on the Factorial website, but that goes to a secondary news organization.

I’m reaching out to both companies for confirmation. In the meantime, if anyone has heard anything since February, drop a note in the discussion.

Image (cropped): The US startup Factorial Energy is aiming its new solid-state EV battery at the up-and-coming market for electric military drones and robotics (courtesy of Factorial).