In this work, we have developed and tested a new type of low-fluorine polymeric CEMs based on a methacrylic polymer backbone including lithium sulfonyl-1-(trifluoromethylsulfonyl)imide functional groups. The membranes were obtained by green UV-photopolymerisation as crosslinked random copolymers between lithium sulphonamide monomers and inexpensive alkyl methacrylates. The versatility of the acrylic chemistry platform, monomer availability and ease of photopolymerisation synthetic methodology enabled a wide range of copolymeric cationic membranes to be fabricated which could be tailored to target desired membrane properties and performance (in terms of ion transport, water uptake, selectivity, and flexibility).