Xiaomi, one of Tesla’s biggest challengers in mainland China over the past year, has unveiled a refreshed version of its fully electric sedan capable of travelling more than 900km on a single charge, as it seeks to stay ahead of intensifying competition. Lei Jun, founder and CEO of the smartphone maker and electric vehicle (EV) start-up, said on Wednesday that the updated SU7 – priced higher than existing variants – would demonstrate superior performance to sustain strong sales growth. “Given...