Experts say Donut Lab's "breakthrough" solid-state battery is just ordinary lithium-ion
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WTF?! Eye-catching battery claims are nothing new, but some deserve closer scrutiny. According to an investigation led by independent researcher Ziroth and supported by more than 20 battery experts, the much-hyped Donut Lab solid-state battery appears to be something far more familiar: a lithium-ion cell.
The conclusion doesn't rest on speculation or anonymous sources. Instead, it comes down to how the battery behaves under testing. Data from Finland's VTT, including voltage curves and expansion measurements, consistently points to lithium-ion chemistry rather than the sodium-ion solid-state design the company claimed.
Start with the voltage. At around 50% charge, the tested cell measures between 3.7 and 3.8 volts. That's typical for lithium-ion batteries, particularly high-nickel NCM chemistries. Sodium-ion cells generally operate at lower voltages and do not reach that range under similar conditions. On its...
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