All-solid-state batteries are considered safer than the lithium-ion ones widely used in EVs because they do not use flammable organic solvents. Solid-state batteries also have higher potential energy density, which can translate into extended driving ranges for EVs. But they are more expensive and more difficult to mass produce.

Panasonic says its solid-state battery can withstand tens of thousands of charging cycles. Conventional lithium-ion batteries, meanwhile, generally last for a few thousand charging cycles.