Mullen Automotive, Inc. (NASDAQ:MULN) shares are trading higher Tuesday. The company announced its subsidiary Mullen Advanced Energy submitted a concept paper in response to the U.S. Department of Energy (DOE) Funding Opportunity for Battery Materials. What To Know: Mullen said the concept paper seeks a $50 million DOE grant. If awarded, the funds will be used to support capital investment for plant equipment and tooling to maximize capacity for manufacturing battery modules and packs for electric vehicles, industrial, energy storage and consumer applications at Mullen’s new 122,000-square-foo…