LCA Evaluation of an Electric Double-Layer Capacitor System as an Energy Storage Device for Hybrid Electric Vehicles

摘要

An energy storage system consiting of electric double-layer capacitors was designed for hybrid electric vehicles (HEV). The input energy and the CO_2 emission for the capacitor system were compared with those for a lithium ion battery ststem. A vehicle of 2,000 cc class was assumed to run inn the 10 centre dot 15 mode defined by Japanese Industrial Standard (JIS). From the result of calculations, the CO_2 emission in the life-cycle model for HEV decreased by 35.7% with increasing system capacity from 666 Wh to 903 Wh, even though the CO_2 emission increased with system capacity at the time of energy storage system manufacture. The superiority of the capacitor energy storage system was clarified by evaluation over the whole of the life cycle model.