Xiaomi Corp.’s quarterly revenue exceeded analyst expectations as the smartphone company gained a foothold in the cutthroat electric vehicle sector it entered in March. Sales rose 31% to 92.5 billion yuan ($12.8 billion) in the September quarter, according to a company statement on Monday, higher than the average estimate of 90.3 billion yuan from analysts surveyed by Bloomberg. About 9.5 billion yuan came from its EV venture....