- Donut Lab’s solid-state battery may be a breakthrough.
- It charges from zero to 80 percent in just 4.5 minutes.
- The company claims an energy density of 400 Wh/kg.
The battery world is hardly lacking in ambition, but it remains controlled by a tight circle of Chinese and Korean heavyweights. When Finnish startup Donut Lab claimed earlier this year that it had developed the world’s first all-solid-state battery for vehicles, it was never going to land quietly.
Donut Lab says it has built what many consider the holy grail of batteries. It claims the pack can charge faster than anything else on the market, delivers 400 Wh/kg of energy density, and is good for 100,000 cycles. Predictably, that raised questions.
Industry experts pushed back hard, which led Donut Lab to team up with Finland’s VTT Technical Research Center to demonstrate just how quickly its battery can actually charge.
Read: Verge Fixed The Two Biggest Electric Motorcycle Problems At Once
In a newly released video, Donut Lab sets out to show the charging speed and thermal stability of its latest battery. The headline figure is a claimed charge rate of up to 11C (286A), which, if sustainable, would put it in rare company.
Cooling Reality Check
In the 11C charging test, the battery cell charged from 0 to 80 percent in just 4.5 minutes when equipped with two heatsinks. A full charge at 11C took just over 7 minutes. During this test, the battery temperature reached 63°C (145°F). In a separate test with just one aluminum heat sink, the temperature rose to 90°C (194°F), prompting a pause for 4 minutes while the battery cooled.
As noted by Electrek, Donut Lab claimed its battery required no active cooling to safely achieve its extraordinary charging speeds. However, this test suggests that some level of thermal management is necessary. Even so, the charging speeds are impressive, particularly for a company of this size.
According to Donut Lab chief executive Vile Piippo, “unlike other solid-state batteries requiring high compressive pressures and undergoing volume changes of up to 15-20 per cent during recharging cycles, the Donut Battery does not require special compression or more extensive cooling.”
Hitting Back At Critics
The company published the results of its fast-charging test on a new website, dubbed “iDonutBelieve,” in a thinly veiled swipe at those who said the firm was exaggerating its claims. It is promising that the results of another test will be released next week, with the aim of proving the pack’s energy density and 100,000-cycle claim.
The first vehicle to use the Donut Lab solid-state battery is an all-electric motorcycle from Verge. Dubbed the TS Pro, it’s set to arrive in the first quarter and will be offered with 20.2 and 33.3 kWh packs.
