Like the Nissan leaf currently on the market, electric vehicles sold in recent years are running with batteries such as lithium-ion batteries.


On the other hand, our laboratory has developed an electric vehicle that can travel with a power storage device called a capacitor as a power source.


  1. 充電速度が非常に速い

  2. 充放電耐性が強い

  3. パワー密度が大きい

  4. 電圧と容量特性が線形であり、残量が把握しやすい


The good point of using capacitor instead of battery is as follows.

  1. Charging speed is very faster.

  2. Strong charge / discharge resistance

  3. Power density is high.

  4. Voltage and capacitance characteristics are linear, and the remaining amount is easy to grasp.


This is a capacitor driven vehicle witch we developed in our laboratory, using Toyota Motor's COMS.This vehicle is able to run for 20 to 30 minutes with only 30 seconds of charge, and we have a track record of actually driving at Komaba campus. In the experiment, the maximum speed can be up to about 50 km/h.


Of course, the mainstream of lithium ion battery also has advantages in terms of cost, energy density and so on. Therefore, our laboratory has the idea that the capacitor does not completely replace it with the battery, and that we can make good use of the good part by coexistence. In the second generation wireless in-wheel motor currently being studied, a lithium ion capacitor is mounted on the wheel part, and combined with the battery mounted on the car body side, it will have two power sources. With this cooperation, we are currently conducting research to improve further efficiency well by using capacitors in parts where higher responsiveness is required than batteries.