FRANKFURT—Luxury sportscar maker Porsche AG, which parent Volkswagen could float in a partial stock market listing later this year, on Friday set out a more ambitious sales target for electric vehicles. More than 80 percent of newly sold Porsche vehicles will be fully-electric in 2030, Porsche AG Chief Executive Oliver Blume said at the group’s annual press conference. That target previously applied to Porsche’s electrified models overall, which also includes plug-in hybrids. Porsche AG also stuck to its long-term target of an operating margin of at least 15 percent, finance chief Lutz Meschke said. Volkswagen and its top shareholder Porsche SE struck a framework agreement for a potential partial listing of Porsche AG, which could value the division at up to 90 billion euros. Such a listing would include listing up to 25 percent of Porsche AG’s preferred stock, selling 25 percent plus one ordinary share in the carmaker to Porsche SE …