QuantumScape stock has more than doubled in three months. Its latest partnership is adding fuel to the fire.Shares of QuantumScape (QS 19.44%) exploded on Wednesday and were trading over 16% through 1:30 p.m. ET. The developer of solid-state lithium-metal batteries for electric vehicles just signed a partnership, and investors see this as a big milestone and catalyst for QuantumScape stock. QuantumScape's new partnershipQuantumScape is partnering with Corning (GLW 1.36%) to jointly develop ceramic separator ...