| Abstract Scope |
Li ion battery is one of suitable energy storage in our life, especially for mobile electronic devices and electric vehicles. Using these devices, battery life and charging time, and safety are very important. Actually, charging time is too long, for example, it takes 5 hours to fully charge in smart phone. This is because SEI layer, decomposed materials of electrolyte; LiF, organic matter etc., is deposited on active materials. In this study, we have tried to insert artificial SEI of high dielectric constant materials, BaTiO3, on the cathode LiCoO2 epitaxial thin film. The high rate performance and cyclability were enhanced by existence of triple phase interface, cathode–electrolyte-dot BaTiO3. The key point of this effect is that high dielectric constant material is better. We will discuss an effect of inserted dot materials.1) S. Yasuhara et al., Nano Lett. 19, 1688-1694 (2019). |