高性能二次電池の開発動向 : 安全性と資源問題の解決に向けて(<特集>電池技術が拓く低炭素社会)

概要

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Advanced secondary batteries such as a nickel-metal hydride battery and Lithium-ion battery which were commercialized in Japan in 1990 and 1992, respectively have been used in the daily life, such as cellular-phone, note-book computer, power-assisted bicycles, hybrid-vehicles, and electric vehicles. The production numbers of these secondary batteries have increased rapidly, now comprising of 60% of the whole battery sales in Japan. During last decay the energy densities and power densities of these batteries have been doubled. Application of these batteries is now expanding from portable appliances (1-30Wh) to low-carbon emission vehicles (1-30kWh) and then energy storage systems (MWh) for solar and wind power plants. Further improvement on both energy density and safety for the lithium ion battery have been demanded for the electric vehicles, pushing strongly research and development on new battery materials such as positive and negative electrodes, separator and electrolyte. Development of new materials would be the key issues for taking initiative in developing advanced secondary batteries and also advanced clean vehicles.
2010-05-20