The US lags far behind in the making of the raw materials that go into making lithium ion battery cells. The most costly component is cathode materials. Mr. Straubel, a former Chief Technology Officer at Tesla who started Redwood Materials is planning to invest $3.5 billion in making the cathode material at its Reno, Nevada plant. In this WSJ interview he discusses various aspects of this venture as the EV industry takes off with large battery investments in the US by Korean and American makers in batteries.