FRANKFURT—Mercedes-Benz on Monday took the wraps off its battery-powered VISION EQXX prototype which it says will have a range of more than 1,000 kilometres (km) per charge, taking a big stride in its electric vehicle (EV) ambitions. Daimler, soon to be rebranded Mercedes-Benz, announced plans in 2021 to invest more than 40 billion euros ($45…