For the upcycling to disordered rocksalt type Li4Mn2O5 and Li2MnO2.25F, stoichiometric quantities of recovered LiMn2O4, Li2O and MnO or LiF (Equation 1 and 2) were weighed out using an analytical balance (± 0.1 mg) in an Ar-filled glovebox. These reagents were then ground together using a Pulverisette 7 planetary ball-mill with 5 mm silicon nitride milling balls and a 45 mL silicon nitride pot at 900 rpm for 8 hrs. The total milling time was broken up into 10 minute intervals followed by a 5 minute rest period to ensure that there was no excessive heating of the milling pots. XRD data were collected using a Bruker D2 phaser with a Co X-ray Kα source (λ = 1.79 Å) and a Bruker D8 diffractometer with a Cu Kα X-ray source (λ = 1.54 Å). Measurements were conducted in the range of 10 -90˚ with a step size of ~ 0.02˚. Rietveld and Pawley refinements were performed using the GSAS-II and TOPAS version 6 programs. Scanning electron microscopy (SEM) images were taken using a HITACHI TM4000plus SEM with an AztecOne EDX analyser.