While electrical storage devices store energy by spatially redistributing charge carriers and thus creating or modifying an electric field, chemical reactions take place in electrochemical storage devices in which electrons are released and later reabsorbed. Electrochemical Energy Storage (EES) refers to devices that convert electrical energy into chemical energy during charging and back into electrical energy upon demand. These basic facts are sketched above in Fig. Basic modes of electric energy storage. Electrochemical energy storage systems have the potential to make a major contribution to the implementation of sustainable energy. This chapter describes the basic principles of electrochemical energy storage and discusses three important types of system: rechargeable batteries, fuel cells and. The different storage technologies can be classified on the basis of the different methodologies utilized: electrochemical (lead-, nickel-, high temperature salts-, redox-batteries, hydrogen. electrical (capacitors, supercapacitors). Although some storage technologies could work for several.
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