In recent years, all-vanadium redox flow battery (VRFB) has been paid much attention as a new type of battery for energy storage. Researchers have been focusing much on production and optimization of vanadium electrolyte solutions used for the key materials in VRFB. Production of high concentration and stability electrolyte is one of key technologies referring to VRFB. Commercialization process can be accelerated with the performance improvement of vanadium electrolyte solutions. The research progress in VRFB electrolyte solutions is summarized in this paper. The preparation methods and influence factors of stability on vanadium electrolyte solutions are mainly introduced, and concentration analysis methods and existence forms of vanadium ions in vanadium electrolyte solutions are also discussed. Moreover, further research and prospects on vanadium electrolyte solutions are presented. Contents
1 Introduction
2 Production of vanadium electrolyte solutions
2.1 Chemical synthesis methods
2.2 Electrolytic synthesis methods
3 Concentration analysis of vanadium electrolyte solutions
4 Research on stability of vanadium ions in vanadium electrolyte solutions
4.1 Supporting electrolyte solutions
4.2 Temperature
4.3 Additives
5 Research on existence forms of vanadium ions in vanadium electrolyte solutions
6 Outlook