Recovery and regeneration of waste electrolyte from all-vanadium redox flow battery
Vanadium flow battery is an electrochemical energy storage device.As energy is stored in the electrolyte,power and capacity are independent of each other,which has outstanding advantages in the field of large-scale energy storage.However,the recovery and treatment of the used electrolyte of the battery is a challenge.Electrochemical tests and electrolyte composition analysis showed that the activity of the waste electrolyte did not decrease significantly,and the focus of recovery should be the comprehensive adjustment of the electrolyte valence state.This paper proposes four electrolyte recov-ery methods,the optimal proportion recovery method,direct electrolysis method,sulfuric acid electro-lysis method and asymmetric electrode method,which can restore the electrolyte capacity to 75％,92％,93％,92％ of the initial state,respectively,and the coulombic efficiency of the battery is maintained at 95％～98％,showing good charge and discharge performance.This study is conducive to promoting the comprehensive utilization of vanadium resources and has important guiding significance for the applica-tion and operation maintenance of vanadium flow batteries.
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