Recently, the team led by Zhang Huamin and Li Xianfeng, Researcher of Storage Energy Technology Research Institute, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, made progress in the new flow battery system and developed a new generation of high-energy density, low-cost neutral liquid zinc-iron liquid flow Battery system, research results published online in the "German Applied Chemistry".
Large-scale energy storage technology is the key core technology to achieve the universal application of renewable energy. Because of its high safety, large energy storage capacity, high efficiency and long service life, the flow battery has a good application in the field of large-scale energy storage Prospects of the whole vanadium flow battery is currently the most mature development of the flow battery technology is now in the demonstration phase of the industry, but the battery is still low energy density, high cost problems.To this end, the research team to choose the cost Low FeCl2 and ZnBr2 as active substances, a neutral flow battery system was constructed.The complexation technology was used to solve the problem of iron hydrolysis under neutral conditions, the use of porous ion conductive membrane to replace the traditional ion exchange membrane to solve the problem of iron ion contamination Which leads to the problem of high membrane internal resistance and improves the conductivity of the ions in the neutral medium and improves the performance and stability of the neutral zinc-iron flow battery. Under the operating current density of 40 mA / cm2, The energy efficiency of over 86%, continuous operation of more than 100 cycles no significant attenuation of the performance of the system active substance concentration up to 2M, the volume energy density of up to 56Wh / L. More importantly, Compared to other flow battery system, the system has a lower cost (<400RMB/kWh) , 表现出很好的应用前景. 该工作对于新一代液流电池的研究开发, 具有重要的指导意义.
The research has been supported by the National Natural Science Foundation of China, the key projects of Chinese Academy of Sciences, the "Top Talent of Young Scientists" of the Central Organization Department of Youth and the Collaborative Innovation Center of Chemical Energy Materials Chemistry of the Ministry of Education.
