A number of cars and concepts turned heads at the at the Detroit motor show, but it was a claim by General Motors’ CEO Mary Barra (above) that swung the spotlight on to a showpiece of another sort: lithium-ion battery technology. Barra said that GM and its 2017 Chevrolet Volt car had “cracked the code” of combining long range with an affordable price. Improved lithium-ion … [Read more...] about General Motors’ CEO highlights battery technology and the race for the greenest machine