Battery breakthrough achieves energy density necessary for electric planes

https://uk.finance.yahoo.com/news/battery-breakthrough-achieves-energy-density-133548407.html

"aim of significantly increasing the battery’s cycle life. Energy density has been the biggest obstacle towards the advancement of electric planes, with 500Wh/kg viewed as an important benchmark for achieving both long-haul and high-capacity flights... potential to hold up to five times more energy than lithium-ion batteries of the same size (3,460 Wh/kg), however previous experimental designs have consistently failed beyond the lab scale"