Exxon Mobil Corp. (NYSE:XOM) has invented a type of graphite that can extend the life of electric-vehicle batteries by as much as 30%, pushing the oil major further into advanced battery materials as automakers look for longer-lasting cells and supply chains less reliant on China. “We’ve invented a new carbon molecule that will extend the life of the battery by 30%,” Chief Executive Officer Darren Woods, adding that it’s a “revolutionary step change in battery performance.” According to Woods, several EV…