Battery weight has long vexed engineers designing electric cars for the mass market.
Bigger batteries are needed to power a car for longer distances, but their weight in turn requires the car to expend more energy.
But what if the body of the car itself was a battery?
Researchers at KTH Royal Institute of Technology have found a promising solution with carbon fibre. Eric Jacques, a researcher in vehicle and aerospace engineering at KTH, says carbon fibre can fill two functions in an