| abstract |
An electrochemical device having excellent output characteristics, long life, and high energy density is provided. [Solution] In order to suppress oxidative deterioration of the electrolyte solution on the high potential side, a positive electrode active material having a flat potential behavior such as lithium iron phosphate is used for the positive electrode. Activated carbon for electric double layer capacitors is used for the negative electrode. At this time, when the voltage between the terminals of the electrochemical device is 0 V by a method such as assembling after the positive electrode is precharged, the energy corresponding to the region having a flat potential behavior can be obtained. A high-density electrochemical device can be provided. [Selection] Figure 1 |