Saft Opens France’s First Solid-State Battery Production Lines

France’s solid-state manufacturing milestone highlights a widening battery race across aviation, electric vehicles, drones, and stationary storage. At a glance: Saft, TotalEnergies’ battery subsidiary, has inaugurated production lines in Bordeaux for polymer semi-solid and sulphide solid-state batteries, marking a significant European manufacturing step for next-generation cells. The facility combines more than a decade of research with industrial production capability and uses a dry-electrode process that Saft says can reduce carbon dioxide emissions from that manufacturing stage by up to 40 percent. The development arrives as battery companies diversify beyond conventional liquid-electrolyte lithium-ion systems into solid-state, sodium-ion, lithium-metal, and graphene-aluminium-ion platforms. Tianneng has also presented a portfolio spanning lead-acid, lithium-ion, sodium-ion, and solid-state technologies for mobility and stationary storage applications. Meanwhile, SES AI has completed the ramp-up of a Korean drone-battery plant to one million annually produced NDAA-compliant cells, underscoring demand for qualified domestic and allied supply chains.

Technology advance: Saft’s Bordeaux lines move solid-state chemistry closer to application-specific production. Saft’s new facility in Bordeaux is producing both polymer semi-solid and sulphide solid-state technologies at room temperature, a combination intended to support applications where safety, energy density, and weight are critical. Solid electrolytes replace the volatile liquid or gel electrolytes used in conventional lithium-ion cells, potentially reducing fire risk while enabling higher energy density. Saft states that its solid-state designs can deliver energy-density gains of up to 50 percent compared with standard battery architectures, although performance depends on cell configuration and operating requirements. The company is applying a dry-electrode process, which removes a solvent-intensive coating step and is intended to lower production emissions. Saft has already delivered semi-solid cells for evaluation in aviation, where mass, thermal management, and high-voltage integration are major engineering constraints. The Bordeaux lines therefore represent both a chemistry milestone and a process-development platform for future aerospace battery systems.

Partnerships: Saft and Safran are advancing high-voltage batteries for electric and hybrid aircraft. Saft has delivered its first semi-solid-state battery cells to Safran under an aviation collaboration focused on high-voltage systems for future electric and hybrid propulsion. Safran will conduct most validation and integration work at its System Test Center in Niort, France, giving the partnership a defined industrial test location rather than relying only on laboratory characterization. The collaboration links Saft’s cell-development and manufacturing capabilities with Safran’s aerospace systems expertise, creating a pathway from electrochemical development to aircraft-level assessment. The companies originally announced the cooperation at the 2025 Paris Air Show, but the latest cell delivery is the current operational milestone reported in the available coverage. Evaluation of the solid-state cells and associated batteries is expected to begin next year. For battery engineers, the partnership is significant because aviation demands high-voltage reliability, stringent qualification, low mass, and predictable behavior across demanding duty cycles that differ sharply from passenger-car applications.

Acquisitions/expansions: SES AI expands Korean drone-cell capacity while Gotion advances Moroccan manufacturing. SES AI has completed the ramp-up of its drone battery plant in Chungju, South Korea, to annual capacity of one million NDAA-compliant cells and plans to expand the site to three million cells annually by the second quarter of 2027. The announcement positions the facility around batteries that meet U.S. National Defense Authorization Act supply-chain requirements, a potentially important qualification for defense, aerospace, and commercial drone customers. Separately, Gotion Power Morocco is scheduled to begin commissioning equipment at its Kenitra lithium-iron-phosphate cell plant during the week of October 20, according to industry coverage. The first phase is described as a $1.3 billion project designed for 20 gigawatt-hours of annual capacity, with production expected to ramp progressively. Together, the developments show manufacturers placing capacity in South Korea and Morocco to serve strategic transportation, defense, and energy-storage markets.

Regulatory/policy: Supply-chain compliance is becoming a product requirement for emerging drone batteries. SES AI’s announcement places NDAA compliance at the center of its Korean production expansion, rather than treating regulatory qualification as a later procurement detail. The requirement is especially relevant to drone manufacturers and government buyers that must evaluate where battery cells are produced and whether suppliers satisfy defense-related sourcing rules. The available reporting does not identify a new rule issued during the current window, but it does document a public manufacturing announcement tied directly to compliance-qualified cells. This matters for battery startups because certification, traceability, and geographic origin can determine market access alongside energy density, cycle life, and price. In parallel, Saft’s French solid-state production effort supports European industrial autonomy in a chemistry viewed as strategically important for aviation and space applications. For manufacturers, the policy signal is clear: qualification and supply-chain provenance increasingly shape cell design, factory location, and customer adoption.

Finance/business: Industrial investment is broadening across mobility, aviation, drones, and grid storage. The clearest disclosed capital figure in the available reporting is Gotion’s planned $1.3 billion first phase for its Kenitra, Morocco, LFP cell plant, designed around 20 gigawatt-hours of annual capacity. The project illustrates how battery investment is moving into North Africa as manufacturers seek large-scale production footprints and access to regional automotive and energy markets. Saft’s Bordeaux expansion represents a different business model, emphasizing specialized solid-state production for aerospace and space rather than immediate mass-market automotive output. SES AI’s Chungju ramp similarly targets a focused application, producing NDAA-compliant cells for drones and related customers, with a stated path from one million to three million cells per year. The broader commercial pattern is a segmented battery economy: LFP factories pursue high-volume transport and storage, while solid-state and lithium-metal developers pursue premium applications where safety, weight, compliance, and performance can justify higher engineering costs.

Sources: The Driven, AsiaOne, Business Wire, BatteryTech, CNEVPost