ReMade Proposal Operando investigation structural transformations related to electrochemical insertion battery spent components Prussian Bl

Recycling spent Li-ion batteries has attracted significant attention (high demand, pollution). On the other hand, Prussian Blue Analogues (PBAs) have been studied ascathodes for batteries. PBAs structure, AxM[M · zH2O, consists of a double perovskite framework with (C#N) anions bridging MN6 and M C6 octahedra; A+ and H2O occupy the interstitial sites. PBAs capacity to intercalate Ni and Co was suggested by Cui et al.; such a possibility opens the utilization of PBAs for Li-ion battery recycling, using an equivalent technology than employed for lithium recovery. We have studied the recovery of Co and Ni by an electrochemical method using K0.68Ni[Fe(CN)6]0.89 1.86 H2O. However, the electrochemical and structural studies showed contradictory results suggesting that Co2+/Ni2+ intercalation could be hindered by competition with H3O+.