The lithium-air battery, developed at the Japanese National Institute for Materials Science (NIMS), had an energy density of over 500Wh/kg. By comparison, lithium-ion batteries found in Tesla vehicles have an energy density of 260Wh/kg.
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.
WOW !!
Lithium-air batteries have the potential to hold up to five times more energy than lithium-ion batteries of the same size (3,460 Wh/kg),