Title: Research data supporting the publication of 'Upcycling of low value end-of-life cathode material into next generation cathode materials' Electrochemical folder: contains electrochemical data for materials discussed in the paper. gives discharge capacities and cycle numbers ICP-OES: contains ICP-OES data for leaching studies performed in the paper. concentrations of metals are given at different times. XRD: contains XRD data for materials discussed in the paper. gives intensities at different 2theta positions. Refinements: contains refinement data for associated XRD data above.