(19)

(11)

EP 4 508 699 A1

(12)

(43) Date of publication: 19.02.2025 Bulletin 2025/08 (21) Application number: 23789023.1 (22) Date of filing: 14.04.2023

(51) International Patent Classification (IPC):  H01M 8/18(2006.01) H01M 12/08(2006.01) H01M 4/96(2006.01) (52) Cooperative Patent Classification (CPC): H01M 8/18; H01M 12/08; H01M 4/96 (86) International application number: PCT/US2023/018696 (87) International publication number: WO 2023/201068 (19.10.2023 Gazette 2023/42)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 14.04.2022 US 202263363020 P 26.10.2022 US 202263381099 P (71) Applicant: Form Energy, Inc. Somerville MA 02143 (US)

(72) Inventors: CHIANG, Merrill K. Somerville, Massachusetts 02143 (US) SU, Liang Somerville, Massachusetts 02143 (US) CHIANG, Yet-Ming Somerville, Massachusetts 02143 (US) WOODFORD, William Henry Somerville, Massachusetts 02143 (US) RAMAN, Kailash Somerville, Massachusetts 02143 (US) (74) Representative: Kompter, Hans-Michael  Heumann Rechtsanwälte- und Patentanwälte Spessartring 63 64287 Darmstadt 64287 Darmstadt (DE)