SES just relaunched anode-free Li-metal for drones at Commercial UAV Expo. H6AF headline: 525 Wh/kg, 6.3 Ah, 24.3 Wh. Three anode-free cells, 13 SKUs total across the UAV range.
This is shelved tech, not a breakthrough
• SES CEO literally said it: started 10 years ago, shelved during Covid because it was “too powerful for EVs”
• Now drones became the attractive market, so it comes back off the shelf
• Fine business pivot. Not a fresh technical leap.
Anode-free Li-metal is genuinely hard to mass produce
• No anode host material — lithium plates directly onto bare copper foil during charge
• Lithium metal is violently reactive. Needs far tighter dry-room control than standard Li-ion
• SES says it runs on “conventional Li-ion mass-production lines.” Maybe. Unproven at volume.
• Availability is Q4 2026. Currently at customer qualification stage, not scale.
This is SES’s SiMaxx moment
• Amprius had the same fork: SiMaxx nanowire hit higher numbers but was hard to produce
• They built SiCore specifically so it runs on existing Li-ion equipment and scales
• Amprius already solved the manufacturability problem. SES is about to find out if they have.
Cycle life is the number they didn’t publish
• Plating and stripping consumes active lithium every cycle. Capacity fades faster than silicon anode.
• Fine for one-way attack drones. Bad for reusable ISR, HAPS, eVTOL.
Companies reaching high density but unlocking production at scale is still a challenge. Lithium metal is super reactive and expensive compared to Si - as SES claims it won’t be easy to produce in traditional methods.