V(V)在硫酸水溶液中溶解度低，且随温度升高，溶解度进一步下降，致使全钒液流电池用电解液浓度低，且要配备价格昂贵的冷却系统。这不仅提升了储能系统的成本，降低了系统的能量转化效率，更限制了电池大功率充、放电性能。提升V(V)在较高温度下在硫酸随溶液中的热稳定性已成为全钒液流储能系统发展迫切需要解决的问题。研究过程中发现，某些含磷化合物对提高V(V)在硫酸水溶液中的热稳定性和电化学活性有积极的影响，但这类添加剂是如何影响V(V)与硫酸、以及水等溶剂的相互作用的，目前尚不清楚。本项目拟通过研究添加剂加入前、后，电解液核磁共振谱、红外光谱、拉曼光谱、紫外-可见光谱等的变化，获得添加剂在电解液系统中与V(V)、硫酸、水等的相互作用变化规律，为添加剂结构设计和选择提供指导。

The solubility of V (V) in sulphuric acid aqueous solution is low, and with the increase of temperature, the solubility further decreases, resulting in low concentration of electrolyte for all vanadium flow battery and expensive cooling system. This not only increases the cost of the energy storage system, reduces the energy conversion efficiency of the system, but also limits the high-power charging and discharging performance of the battery. Enhancing the thermal stability of V (V) in sulfuric acid solution at high temperature has become an urgent problem for the development of all vanadium liquid flow energy storage system. It has been found that some phosphorus compounds have a positive effect on improving the thermal stability and electrochemical activity of V (V) in sulfuric acid aqueous solution. However, how these additives affect the interaction of V (V) with sulfuric acid, water and other solvents remains unclear. This project intends to study the changes of NMR, FT-IR, Raman and UV-Vis spectra of electrolyte before and after adding additives, and obtain the interaction rules of additives with V (V), sulfuric acid and water in electrolyte system, which will provide guidance for the design and selection of additives structure.