A stable vanadium redox-flow battery with high energy density for large-scale energy storage - Chen, Baowei.; Graff, Gordon.; Hu, Jianzhi.; Kim, Soowhan.; Li, Liyu.; Liu, Jun.; Nie, Zimin.; Vijayakumar, M.; Wang, Wei.; Xia, Guanguang.; Yang, Zhenguo.; Zhang, Jianlu.