The expectations for the batteries on board are low cost and the increase in the cruising range. The battery under development uses a higher-capacity anode than usual, but its high activity causes a side reaction with the electrolyte, resulting in low charge-discharge efficiency. In addition, lithium dendrite growth during charging is a safety concern. We try to solve these problems by adopting a solid electrolyte. Moreover, we aim for the electrodes that can be mass-produced at low cost. To realize their high-speed mass production, we have been striving to establish both making slurry and painting of cathode composite, as well as a roll press process to ensure the electrode packing density and interface adhesion. Furthermore, to maximize the energy density, we have been working on making the materials into thinner layers that do not contribute to energy.