AUTHOR=Zhang Sheng S. TITLE=Status, Opportunities, and Challenges of Electrochemical Energy Storage JOURNAL=Frontiers in Energy Research VOLUME=1 YEAR=2013 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2013.00008 DOI=10.3389/fenrg.2013.00008 ISSN=2296-598X