Abstract
Energy devices, such as high performance secondary battery and fuel cell, are the most important technology as the base of the society in the 21st century, which are strongly related to information, energy and environment tech-nology. For example, recently developed mobile computational era has been largely contributed to the high performance Li ion battery (LIB), providing the light weight and small sized rechargeable battery. The typical energy devices are LIB, electric double layer capacitor, direct methanol and polymer electrolyte fuel cells, which are consisted of carbon elements as a major and key component. Namely, both of carbon science and technology can contribute enormously to the innovation of the new century technology. In the present paper, the recent development and future possibility of such carbon-based energy devices are demonstrated and discussed by comparing the performances with each energy devices.
