[NMC111]) and have focused on single phase cathode regeneration. The elements in solution can then be used to reform the original material or upcycled to form a more desirable material. Recovered LiFePO4 (LFP) and LMO have been used to synthesise LFP/C and LiMnPO4/C nanocomposites respectively with good cycling performance reported. Recovered LMO has also been suggested as a potential cathode material for sodium ion batteries. Within EVs, mixed cathode materials are sometimes utilised to combine the advantages of the different materials. For example, LiMn2O4 (LMO) can be combined with LiNi0.8Co0.15Al0.05O2 (NCA) or LiNixMnyCozO2 (NMC) to synergise the thermal stability of the LMO component with the high capacity and long lifetime provided by the NCA/NMC component. However, this increases the complexity of recycling as there are more components within the cathode that must be considered within recycling processes. Furthermore, future waste streams are likely to contain mixtures of different cathode chemistries through shredding together of batteries from different sources. This is particularly the case for consumer batteries for portable devices, such as mobile phones. Zou et al proposed a method to recycle mixed cathode materials containing LCO, LMO, NMC111 and LFP and then form NMC111. Similar cathode materials have also been used to form NMC532 and NMC622. Driscoll et al recently published a paper where ascorbic acid was used to selectively leach one component from a mixed cathode material. 12 NMC532 was then formed from the leaching solution. While these methods appear promising, they represent the manufacture of current or older generation cathode materials from end-of-life materials. In the future there must be a focus on upcycling to form next generation cathode materials to ensure that recycling is adapting to the evolving battery landscape. LiMn1.5Ni0.5O4 (LMNO) is one example of a new material that is gaining interest for next generation LIBs due to its high operating voltage (~ 4.7 V). Its higher operating voltage allows it to be used alongside high voltage anodes, such as Nb oxide based anodes to deliver 3 V high power cells. However, this high operating voltage can introduce problems when using conventional electrolytes as they are not typically stable at higher voltages and so electrolyte additives are required. LMNO can be synthesised by a variety of methods such as solid state, co-precipitation, sol-gel, and hydrothermal. The different synthesis methods and reaction conditions have an influence upon the structure and electrochemical performance of LMNO. LMNO can form an ordered (P4332) or disordered (Fd3 ̅ m) structure depending on the degree of ordering between Ni 2+ and Mn 4+ in the structure. Ordered LMNO has a flat voltage profile with a voltage plateau at ~ 4.7 V due to Ni redox activity. In contrast, disordered LMNO contains a small amount of Mn 3+ which results in an additional voltage plateau at 4 V due to Mn 3+ redox.