Finally, compared with other types of PEO-based SPEs reported in the literature, the promising performances of the developed crosslinked SPE10:1:1-CL are highlighted (as shown in Table ). It not only shows excellent cycling performance with high loading LFP cathodes, but also surprisingly good compatibility with very high loading, high energy 4V-class LMO cathodes, which is a remarkable result within the PEO-based SPE family due to the low oxidative stability of PEO. Our findings collectively highlight the synergistic benefits of concentrated ionic liquid and the crosslinking approach in the designed PCIL-SPEs. The superior rate performance and prolonged cycling stability observed in the crosslinked PCIL-SPEs suggest they are a promising avenue for their deployment in high energy density solid-state LMBs.