Demand for battery-grade lithium (Li) salt precursors (≥99.5%) has abruptly ramped up in the last few years driven by the fast-growing market of lithium batteries for the electrification of transport. For instance, global Li production in 2022 has reported a significant increase of 21% from the previous year when compared to other mineral commodities. This is only going to grow exponentially as demonstrated by the recently updated McKinsey's estimation of the Li-ion battery market growth, which now reports a 6.7 times increase from 700 GWh in 2022 to 4.7 TWh by 2030, instead of the previously reported 2.6 TWh by 2030. High-purity precursors for battery materials are produced from either hard-rock minerals or Li-rich brines through a beneficiation process. The final step in processing is purification. Currently, the methods used in the purification process require large amounts of hazardous chemicals as well as longduration and energy-intensive steps to produce the final material. Mainstream cathode materials such as LiCoO2, LiNixMnyCozO2 or LiNi0.8Co0.15Al0.05O2 employ lithium carbonate (Li2CO3) and lithium hydroxide (LiOH) as key precursor materials for their synthesis, with LiOH being preferred due to the lower calcination temperature of around 650 °C required to obtain the oxide cathode materials from LiOH as opposed to around 900 °C for lithium carbonate. In the case of LiOH production from hardrock minerals, acid-roasting of the β-spodumene mineral with sulphuric acid produces a lithium sulphate (Li2SO4) leachate. The subsequently purified leachate would then be converted into the desired LiOH by reacting with caustic soda. Currently, this conventional method used in the final product conversion involves a large amount of chemicals as a precipitating agent. It also generates a significant chemical byproduct/waste which undermines the sustainability of the overall battery manufacturing process. Electrodialysis has recently been proposed as an alternative green technology to convert leachate produced from ores, Li-rich brines, or even existing high-purity Li2CO3 products into LiOH battery precursors. Electrodialysis uses ion exchange membranes that enable the selective transport of ions based on their charge and size, and is a well-established method used in water desalination for the separation of metallic cations and their accompanying anions. In the specific case of Li salts, selective separation in a cost-effective and environmentally sustainable manner has been reported. Furthermore, electrodialysis can produce green hydrogen as a result of the water-splitting reaction that occurs during LiOH production. The key mechanism in an electrodialysis-driven LiOH production is the transport of Li ions from a Li-containing liquor through a cation exchange membrane (CEM) to a LiOH-receiving solution in which water oxidation produces the OH -ions necessary to increase the concentration of LiOH. At the same time, H + are produced in the anodic compartment which combines with SO4 2-anions to produce sulfuric acid (H2SO4) which can potentially be recycled back into the leach circuit. The process is illustrated in Figure . Current electrodialysis technologies have mainly focused on the use of polyfluoro-alkyl (PFAS)-based monovalent CEMs used in the chloro-alkali industry, such as Nafion TM . This class of membrane is a good option for Li-salt electrodialysis given their high chemical resistance in acidic and alkali media, high mechanical stability and relatively low electrical resistance. There are, however, several drawbacks that need to be addressed, such as the CEM's low selectivity to Li-ion transport versus other monovalent species such as H + or Na + (ideally values above 1 would be required to minimise interference from Na + impurities), undesired gas permeation, and hydroxide leakage that can decrease energy and current efficiencies. Additionally, the use of highly-fluorinated PFA polymer backbones and sidechains in polymeric materials is currently under scrutiny by a number of countries with new legislation being enacted that will restrict their use due to their environmental impact. In particular, the current preferred CEM option, Nafion TM , as well as being expensive, is a polymer composed of a highly perfluorinated polymer backbone and pendant sulfonate functional groups. Novel approaches to membrane design are therefore required to develop membranes with reduced levels of fluorination as well as enhanced Li selectivity.