López-Aranguren, PedroPedroLópez-ArangurenLannelongue, PierrePierreLannelongueCarrasco, JavierJavierCarrascoGolov, Andrey A.Andrey A.GolovRobles-Fernández, AdrianAdrianRobles-FernándezGonzalo, Elena C.Elena C.GonzaloTron, Artur V.Artur V.TronMarchandier, ThomasThomasMarchandierHatz, Anna KatharinaAnna KatharinaHatzFathi, RezaRezaFathiXu, QiQiXuChaykina, DianaDianaChaykinaVarkey, Cerun AlexCerun AlexVarkeyGavagnin, ClaudioClaudioGavagninKaminski, MatteoMatteoKaminskiAlmousli, AlaaAlaaAlmousliEshetu, Gebrekidan GebresilassieGebrekidan GebresilassieEshetuHamzelui, NiloofarNiloofarHamzeluiDiaz, FabianFabianDiazDrude, Emanuel SebastianEmanuel SebastianDrudeAbada, SaraSaraAbadaGuy, Nicolas G.Nicolas G.GuySudharshan, AkshayanAkshayanSudharshanBrunetti, MassimoMassimoBrunettiBeschnitt, StefanStefanBeschnitt2025-04-252025-04-252025https://publica.fraunhofer.de/handle/publica/48699710.1016/j.csbj.2025.03.0132-s2.0-105001042948The development of sustainable, high-efficiency and reliable batteries is critical to support climate neutrality goals, particularly in the electromobility sector. The European-funded HELENA project (Halide Solid State Batteries for Electric Vehicles and Aircraft) addresses these challenges by focusing on the manufacturing of next-generation lithium-metal solid-state batteries. The project tackles key hurdles in raw material sourcing, battery production, sustainability and cost-effectiveness. A multidisciplinary partnership brings the innovation from the lab to the industrial scale, covering the whole value chain, including industrial material producers, R&D centres, battery manufacturers, and automotive and aerospace end-users. The cell design features a high-voltage nickel-rich cathode coupled with a high-energy lithium metal anode and a lithium-ion superionic halide solid electrolyte. This configuration enhances energy and power density, thus being suitable for electric vehicles and aircrafts. HELENA aims to reshape the solid-state battery landscape by advancing technology readiness levels through the manufacturing of 10 Ah pre-industrial prototypes. This report highlights mid-way results of the project, discussing the major advancements in battery specifications and safety standards from end-users, processing of materials into battery component, battery modelling and recycling strategies to ensure long-term sustainability.entrueBattery roadmapClimate neutralityElectric aviationElectric vehiclesHalidesSolid-state batteriesjournal article