Short answer: solid-state is our R&D platform, not a product you can order today. The target is a 3 V cell built on a new high-temperature sintered electrode — 210 Wh/kg, 10,000 W/kg, more than 30,000 cycles and a material cost under ¥1 per Wh, measured against the capacitor-type NiMH cells we ship now.
What changes in a solid-state cell?
Two things. The electrode is produced by high-temperature sintering instead of pasting onto nickel foam, and the aqueous electrolyte is replaced by a solid electrolyte. The result is that nominal voltage rises from 1.2 V to 3 V per cell — two and a half times the voltage in the same can.
What are the targets?
| Metric | Capacitor NiMH today | Solid-state target |
|---|---|---|
| Nominal voltage | 1.2 V | 3 V |
| Energy density | 60–120 Wh/kg | 210 Wh/kg (+200%) |
| Power density | ~2,500 W/kg | 10,000 W/kg (+300%) |
| Full cycles | >10,000 | >30,000 (+300%) |
| Material cost | baseline | <¥1 per Wh (−100%) |
What would it mean for a vehicle pack?
Higher voltage per cell means fewer cells for the same pack voltage, which means fewer welds, fewer connections and less packaging. At the target energy density a 288 V pack would need roughly a third of the cells it needs today.
Will it replace NiMH packs?
Not in the near term. Capacitor-type NiMH is in production, proven in rail and grid duty, and cheap to build. Solid-state is the next platform, and it will be introduced where its energy density is worth the early cost.
Frequently asked questions
Can I order a solid-state pack?
No. It is in development, and we do not publish a date until the cell passes the same abuse and ageing protocol as the current range.
Is it lithium-free?
The programme is built on the aqueous metal-hydride platform, so it does not depend on a lithium supply chain.
Where can I read about what ships today?
Start with the capacitor-type NiMH cell article and the NiMH packs we build for Toyota and Lexus hybrids.
Frequently asked questions
Can I order a solid-state hybrid battery?
No. Solid-state is our R&D programme — there is no part number, no price and no release date. Nothing on that page can be ordered.
What are the targets?
A 3 V cell on a high-temperature sintered electrode, 210 Wh/kg, 10,000 W/kg, more than 30,000 cycles, and a material cost under ¥1 per Wh.
What should I buy if I need a pack now?
The NiMH and Li-ion packs we ship today. They are available now, with a 3-year / 100,000 km warranty.
