Stellantis and Factorial Energy have announced the successful validation of Factorial’s automotive-size FEST (Factorial Electrolyte System Technology) solid-state battery cells. Solid-state batteries could offer higher energy density and faster charging than today’s lithium-ion batteries. The validated 77 Ah FEST cells demonstrated specific energy of 375 Wh/kg over 600 cycles, progressing towards automotive qualification. The cells… Read more »
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Factorial Energy opens solid-state battery factory in Massachusetts
Factorial Energy, a developer of solid-state battery technology for EV applications, has opened a new battery manufacturing facility in the Boston suburb of Methuen, Massachusetts. The new plant represents a significant step in scaling up the production of Factorial’s solid-state battery technology for EVs. Factorial says its proprietary FEST (Factorial Electrolyte System Technology) quasi-solid-state batteries… Read more »
Factorial Energy to open solid-state EV cell development and production facility
Factorial Energy, a Massachusetts-based solid-state battery developer, is building a solid-state cell development and manufacturing facility in Methuen, Massachusetts. “The existing 67,000-square-foot building on the site will undergo extensive buildout to house Factorial’s pilot production facility, which will manufacture automotive-sized solid-state batteries at pre-production speed and volume,” says the company. Factorial plans to invest $45… Read more »
Factorial Energy raises $200 million for solid-state battery tech
Massachusetts-based solid-state battery developer Factorial Energy raised $200 million in a Series D funding round from Mercedes-Benz and Stellantis. It will use the funding for research and development, commercial production and the deployment of batteries with its Factorial Electrolyte System Technology (FEST) electrolyte. While Stellantis announced 2026 as its goal for introducing the first competitive… Read more »
Factorial Energy and Hyundai partner to test solid-state battery technology
Factorial Energy and Hyundai are partnering to test Factorial’s solid-state battery technology and its implementation in Hyundai EVs. The companies will integrate Factorial’s technology at the cell, module and system levels, perform vehicle-level integration, and co-develop specifications for manufacturing Factorial’s batteries. Factorial’s FEST (Factorial Electrolyte System Technology) platform leverages a proprietary solid electrolyte material that… Read more »
Stellantis and Factorial Energy team up to develop solid-state batteries
Stellantis and Massachusetts-based solid-state battery developer Factorial Energy have signed a joint development agreement to advance Factorial’s high-voltage solid-state battery technology. The agreement also includes a strategic investment from Stellantis. Factorial says its solid-state batteries offer 20 to 50 percent more range and increased safety, at the same cost as conventional lithium-ion batteries. The company’s… Read more »
Factorial Energy unveils 40 Ah solid-state EV battery cell
Factorial Energy has introduced what it says is the first 40 Ah solid-state EV battery cell. The Factorial Electrolyte System Technology (FEST) is a proprietary solid electrolyte material designed to enable safe and reliable cell performance with high-voltage and high-energy-density electrodes. Solid electrolytes like FEST are considered safer than conventional lithium-ion technology, as they replace… Read more »
POSCO Future M invests in US-based Factorial to develop all-solid-state batteries
South Korea’s POSCO Future M has invested in battery developer Factorial, following a memorandum of understanding (MOU) signed by the two companies in November 2025 for the development of all-solid-state battery technology. POSCO Future M is preparing for the growth of the all-solid-state battery market and will supply Factorial with a stable source of high-quality… Read more »
Karma Automotive and Factorial partner on solid-state battery production for Kaveya super-coupe
Karma Automotive and solid-state battery developer Factorial have announced what they describe as the first solid-state battery production program in the US for passenger vehicles. Factorial’s FEST (Factorial Electrolyte System Technology) cells will be integrated into Karma’s next-generation vehicle platform, starting with the all-electric Kaveya super-coupe—a 1,000+ hp vehicle with a top speed exceeding 200… Read more »
POSCO Future M and Factorial to cooperate on solid-state battery development
Korea-based battery materials supplier POSCO Future M and solid-state battery pioneer Factorial have signed a memorandum of understanding (MOU) to cooperate on the development of all-solid-state battery technology. Under the MOU, the two companies plan to develop materials for all-solid-state batteries, which are expected to offer higher safety, superior energy density and better charging performance… Read more »