Hybrid electric vehicle battery technology in Fuji heavy industry

Fuji heavy industry, discloses new energy storage technology is oriented in the development of hybrid electric vehicles. Through the use of the company called hybrid capacitor (Hybrid Capacitor) of the storage elements, while the characteristics of the lithium ion rechargeable batteries and electric double-layer capacitors. At the same time, the instantaneous output current is increased to the same level as that of the electric double-layer capacitor, and the energy density of the unit volume is increased to 2 times to that of the original electric double-layer capacitor, which is up to 27Wh/l. Although not announced the details of the specific date of the use of inputs, however, it is said that the discussion of the basic stage has ended, and has begun to be equipped with the car, the evaluation as a hybrid car driver source characteristics.

Fuji heavy industry responsible person in July 11, 2005 in the United States, Santiago, the opening of the Advanced Capacitor World Summit 2005, published the technology. The anode and activated carbon for electric double layer structure is identical to the original, and the cathode by the joint development with Japan Kanebo Polyacence (Polyacenes, PAS) materials, and is still used in the electrolyte of propylene carbonate (Propylene Carbonate) class of solvent and lithium salt. Through the storage and release of lithium ions in the cathode of the class PAS material, that is, through the phenomenon called "Intercalation (insert)" to obtain two kinds of effects of electric double layer and lithium ion redox. Discharge voltage can be set to a high of about +3.8V. Thus, the energy density is increased.

The company had been successfully tested the production capacity of about 2000F of flat cell units. The energy density per unit weight is 6Wh/kg, and the energy density per unit volume is 27Wh/l. The experimental results show that the charge and discharge cycle life can reach up to 100 thousand times at room temperature. "In fact, it is expected to improve the cycle life several times" (Fuji heavy industry responsible person). However, there are still problems to be solved under the conditions of low temperature, therefore, the company said that in the future will be to improve the material properties and other aspects of further efforts.