What did the VTT test reveal about Donut Lab's battery?

The VTT test showed Donut Lab's battery retained 97.7% of its energy after a 10-day idle period, demonstrating normal battery-type charge retention.

How does Donut Lab's battery compare to supercapacitors?

Donut Lab's battery demonstrated stable, long-term charge retention, unlike supercapacitors which typically lose significant energy through self-discharge over a few days or weeks.

What are the claimed specifications for Donut Lab's solid-state battery?

Donut Lab claims its battery delivers 400 Wh/kg, can charge in under 10 minutes, and lasts for 100,000 cycles.

Home / Technology / Finnish Startup's Solid-State Battery Beats Self-Discharge

Finnish Startup's Solid-State Battery Beats Self-Discharge

9 Mar

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Summary

New battery retains 97.7% charge after 10 days, unlike supercapacitors.
Claims 400 Wh/kg energy density, double current lithium-ion batteries.
Promises under 10-minute charging and 100,000 cycle lifespan.

Finnish Startup's Solid-State Battery Beats Self-Discharge

Finnish startup Donut Lab has presented third-party test results from VTT Technical Research Centre of Finland to counter speculation that its new solid-state battery is actually a supercapacitor. The independent tests focused on the battery's charge retention over an extended idle period.

The VTT center conducted a 10-day test, measuring the battery's voltage every 10 seconds. Results showed the cell retained 97.7% of its energy, a characteristic of batteries, not supercapacitors which typically experience significant self-discharge.

While a minor voltage drop occurred in the first hour due to chemical stabilization, the overall stability disproved theories of it being a supercapacitor. Donut Lab claims its battery offers 400 Wh/kg, significantly higher than typical lithium-ion batteries.

Furthermore, Donut Lab asserts its solid-state battery can charge in under 10 minutes and last for 100,000 cycles, a substantial improvement over current EV battery lifespans. The company aims to clarify its potentially revolutionary technology.

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