ElectrodialysisElectrodialysis is an emerging technique for sustainable nickelNickel refining in recyclingRecycling of black massBlack mass from spent lithiumLithium-ion batteriesBattery. Black massBlack mass is leached and the leachate is mixed with a chelating agentChelating agents to form nickelNickel chelates, recoverable by electrodialysisElectrodialysis. Two agents were used for recovering nickelNickel from NMCNickel-Manganese-Cobalt (NMC) 811 type black massBlack massethylenediaminetetraacetic acidAcid (EDTA)Ethylenediaminetetraacetic Acid (EDTA) and hydroxyethylethylenediaminetriacetic acidAcid (HEDTA)Hydroxyethylethylenediaminetriacetic Acid (HEDTA), EDTA being a stronger chelating agentChelating agents but HEDTAHydroxyethylethylenediaminetriacetic Acid (HEDTA) being more selective towards nickelNickel. EDTA and HEDTA gave recoveries of 99.2% and 98.5%, respectively, with 82.6% and 33.3% co-recovery of cobaltCobalt at 10% excess addition of the chelating agentChelating agents. Smaller additions gave recovery losses but selectivity improvements, with only 4.15% and 4.64% co-recovery of cobaltCobalt using EDTA and HEDTA at 80% of stoichiometric addition. 87.8% of EDTA was selectively recovered by acidic precipitationPrecipitation at pH 0.3, later recovering 92.9% of nickelNickel by precipitationPrecipitation at pH 12. HEDTA could not be recovered by this method and had to be decomposed with thermally activated persulfate resulting in 96.2% recovery of nickelNickel. This also worked for EDTA, precipitating 96.0% of nickelNickel. EDTA is the preferred chelating agentChelating agents owing to its similar performance to HEDTAHydroxyethylethylenediaminetriacetic Acid (HEDTA) at stoichiometric addition and its potential to be recirculated in an industrial process.