Everything Electric Podcast Donut Labs Solid-State Battery Could Change EVs Forever…If It's Real!
Mar 23, 2026
Dr Euan McTurk, an electrochemist who decodes battery chemistry, and Dave Borlase, EV and clean-energy commentator from Just Have A Think, dig into Donut Labs' bold solid-state claims. They debate ultra-fast charging, energy density versus volume, safety around dendrites and solid electrolytes, and the commercial plausibility and infrastructure needed for real-world rollout.
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Tests Suggest Solid State Safety And Fast Charging
- Independent tests showed Donut's cell could charge very fast and survive extreme heat, suggesting a non-flammable solid-state electrolyte.
- Euan McTurk noted VTT's tests included 5-minute-style charges at 25°C and a 100°C safety soak that didn't lead to catastrophic failure.
Wh Per Litre Beats Wh Per Kilo For EV Range
- Gravimetric energy density (Wh/kg) can be misleading for EVs; volumetric energy density (Wh/L) often matters more.
- Euan explained 400 Wh/kg sounds great but if the cell is low density (like expanded polystyrene) it may not increase pack range much.
Use Ultra Fast Chargers For Specific Use Cases
- Don't assume ultra-fast public chargers will replace home charging for most drivers.
- Euan advised ultra-fast 1.5MW chargers suit HGVs, emergency services, or dense urban hubs, while home overnight charging remains cheapest and simplest.