Update
Chinese Researchers Develop Long-Lived All-Iron Flow Battery
Researchers at the Institute of Metal Research under the Chinese Academy of Sciences have developed a redesigned electrolyte for an alkaline all-iron flow battery that can operate for more than 6,000 charge-discharge cycles with no measurable capacity loss, equivalent to roughly 16 years of daily use. The battery is reported to cost about 80 times less than lithium for the raw material, making it a viable option for grid-scale stationary storage.