By Eric Onstad and Paul Lienert LONDON/DETROIT (Reuters) – Volkswagen, whose drive to develop a “solid-state” electric car battery with U.S. startup QuantumScape has been dogged by delays, is casting its net wider in pursuit of the potentially game-changing technology. The German auto giant is holding talks with France’s Blue Solutions, which already produces solid-state batteries for Daimler electric buses, about adapting the design for cars, a source with direct knowledge of the discussions told Reuters. VW and Blue Solutions aim to reach a joint development agreement in the coming months, a…