To demonstrate the performance of regenerated layered oxide residue and upcycled leached materials, electrochemical testing of cells was carried out. Coin cells were assembled for pristine NMC and upcycled NMC materials (using the leached LMO), but owing to air/moisture sensitivity of Ni-rich LO cathode materials, Swagelok TM cells were prepared for the regenerated cathode material after hydrothermal treatment. Electrochemical testing data for regenerated cathode material after hydrothermal treatment, pristine NMC 532 and upcycled NMC 532 are given in Figure . In the case of the leachate, upcycling to NMC532 was examined. Given that LMO is no longer used in commercial cells, upcycling of this phase is a more likely pathway, and here we show successful upcycling to NMC532. The upcycling to produce NMC532 gives comparable performance to pristine material. In this case coin cell data of pristine NMC 532 gave first charge and discharge capacities of 177 mA h g -1 and 161 mA hg -1 , respectively, while upcycled NMC 532 (using the leachate) gave comparable charge/discharge capacities of 176 mA h g -1 and 158 mA h g -1 , respectively. This illustrates the potential for the selective leaching approach to recover the Mn based component and upcycle to newer chemistries. The LO material, regenerated after the hydrothermal treatment of the remaining solid, gave high initial charge/discharge capacities of 211.9 mA h g -1 and 178.6 mA h g -1 , respectively, although there was significant capacity fade. Therefore, in this case, while the results show respectable performances, further optimisation is needed to improve the cycling stability to commercial levels. It is worth noting in this respect that high Ni NMCs/NCAs typically have a protective coating applied due to their high moisture sensitivity. Further work will target additional studies on the delamination of the electrode strip, rather than the dissolution reported here, to examine the effect of Al levels on performance. An alternative approach to the recycling of the LO phase would be to incorporate additional hydrometallurgical processes to separate the valuable Ni and Co metals, which would benefit from the fact that the LMO phase has been removed, thus concentrating the Ni/Co in the remaining solid and delivering a higher value solid product.