After 200 cycles of vanadium flow battery, the capacity retention rate is less than 10%, and the electrolyte will not be able to charge and discharge. What is the method to reuse the electrolyte?
Vanadium Redox Flow Batteries are one of the most sustainable battery storage system. This is, mainly, due to the recyclability[1,2] and purity[2,3] of the vanadium electrolyte. VRFBs will see increased demand in the coming years[2,3,4].
1. a)Method of restoring electrolyte of vanadium redox flow battery through electrolysis https://patentimages.storage.googleapis.com/af/b8/25/9ed813de284474/US11251452.pdf https://patents.google.com/patent/US11251452B2/en b)Method for producing vanadium electrolytic solution https://patents.google.com/patent/US5368762
2. How VRFBs and Vanadium Electrolyte Support a Circular Economy https://www.ctechinnovation.com/how-vrfbs-and-vanadium-electrolyte-support-a-circular-economy/
3. U.S. Vanadium Successfully Recycles Electrolyte From Vanadium Redox Flow Batteries At A 97% Recovery Rate https://usvanadium.com/u-s-vanadium-successfully-recycles-electrolyte-from-vanadium-redox-flow-batteries-at-a-97-recovery-rate/ https://usvanadium.com/solving-the-technical-and-economic-challenges-to-reprocessing-vrfb-electrolyte/
4. Argonne National Lab achieves battery patents for redox flow, solid-state, multivalent-ion and more https://pv-magazine-usa.com/2022/05/16/argonne-national-lab-achieves-battery-patents-for-redox-flow-solid-state-multivalent-ion-and-more/
The reuse of the electrolyte depends strongly on the use. Ideally, the negative electrolyte V(II)/V(III) is not oxidized by air and can be remixed with the positive electrolyte under a nitrogen atmosphere and used again. A relatively low SoC value should be used during mixing. Otherwise, heat will be generated in the electrolyte.
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