A Japanese university developed an electric double layer capacitor (EDLC) dubbed the "Nanohybrid Capacitor," which has an energy density per unit volume of 20Wh/l. According to the Graduate School of the Tokyo University of Agriculture and Technology (TUAT), the new capacitor has three times as high energy density as existing EDLCs. When commercialized, it may be utilized to store renewable energy or as regeneration systems for hybrid cars, etc. Like the existing EDLCs, it uses activated carbon for the positive electrode. But lithium titanate (Li4Ti5O12) is used for the negative electrode to enhance energy density. In addition, TUAT formed nanocrystallized Li4Ti5O12 with a particle diameter of about 5-20nm and mounted it on carbon nanofibers so that the time required for charging/discharging becomes shorter than that with existing EDLCs.Found if or when we can start using these in our Electric Cars Here
