July 9 (Reuters) - General Motors Co (GM.N) said on Friday second-quarter deliveries with its joint ventures in China rose by 5.2% to more than 750,000 vehicles, helped by higher demand for its large and luxurious sport-utility vehicles and multi-purpose cars. The U.S. automaker said sales of its Cadillac XT6 three-row large luxury SUV grew 42% to about 10,000 vehicles, while demand for its GL8 premium multi-purpose family vehicle increased by 40% to over 45,000 units. (https://bit.ly/3AJMQhb) GM, which is working on its new "Ultium" battery technology, earlier this year unveiled an Ultium-based model for China, the Cadillac LYRIQ all-electric SUV. This electric SUV will go on sale in the country early next year, the company said.