Abstract: This article reviews different energy storage technologies. A statistical analysis is performed, on the basis of the information in the web of science, on the research papers and patents including publication year, originating countries/areas and institutions of the authors. The statistical analysis provides an indication of the development trend of the energy storage technologies. It is shown that, among all the energy storage technologies considered, fundamental studies on lithium ion batteries, supercapacitor, sodium ion batteries, flywheel, superconducting magnetic energy storage and solid state batteries are most actively studied, whereas the technology development of lithium ion batteries, flywheel, supercapacitors, compressed air energy storage, and lead-acid batteries are also very active.

Key words: energy storage, patent, sci-tech articles, statistics