Toyota Motor Corp is to launch an all-electric small sedan in China late next year, having turned to local partner BYD Co (???) for key technology to finally make an affordable yet roomy runaround, four sources said. Two of the four people with knowledge of the matter described the car as an electric holy grail for Toyota, which has struggled for years to come up with a small electric vehicle (EV) that is competitive on cost in China and does not compromise on comfort. The sources said the breakthrough was chiefly down to BYD’s less bulky lithium-iron-phosphate (LFP) Blade batteries…