Requirements of ion exchange membrane for Vanadium Redox BatteryThe key component that affects the service life of vanadium battery is ion exchange membrane, which has been restricting the service life development of vanadium battery. The vanadium membrane of the battery must be hydrophilic, allowing H+ to pass freely, but at the same time it must be able to inhibit the mutual mixing of vanadium ions with different valence states in the positive and negative electrolyte, so as to prevent the self-discharge of the battery from being inhibited in the short circuit of the battery, thus prolonging the service life of the battery. Therefore, it is necessary to select a good conductivity selective ion exchange membrane.

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The ion exchange membrane of vanadium battery must meet the following conditions: (1) Good chemical stability and electrochemical oxidation resistance. (2) Hydrogen ions can freely pass through the membrane and have high conductivity. (3) It has good isolation performance for positive and negative active substances, and the permeability coefficient of vanadium ions is low. (4) longer service life. Physical and chemical stability of ion exchange membrane refers to its ability to resist environmental influences, such as acid resistance; Whether the ion exchange membrane can be used in vanadium battery depends on whether it can be used. It has good mechanical properties, acid resistance and strong oxidation resistance of pentavalent vanadium. The ideal diaphragm should have the characteristics of high current efficiency, high voltage efficiency, high energy efficiency and long service life.