US Electric Vehicle solid state battery developer QuantumScape, which has a long term development agreement with Volkwagen, said this week it has overcome key obstacles to fast charging, longer life and range improvement on EVs. The news sent its share price rocketing and it had already been on a roll since it went public in September, reversing into an existing stock and then in November taking a £500 million PIPE investment, part of a deal to make $680 million of cash available to the battery maker, from financial backer Kensington Capital Acquisition, part of Kensington Capital Partners, after it had secured long term tie-in agreements with key execs of QuantumScape. A pipe is a private investment in a public equity…