A facile method for construction of a functionalized multi-layered separator to enhance cycle performance of lithium manganese oxide

A facile approach has been proposed to improve the cycle performance of LiMn₂O₄-based cathodes by chemical modification of the separator. This strategy is based on the construction of a multilayer structure consisting of an interlayer with polar hydroxyl (OH) groups to promote the chemical reactivity between a hydrophobic separator and a surface layer with a HF scavenger to remove any HF remaining in the electrolyte. Systematic studies performed in this work indicate that separator functionalization is effective in increasing the structural stability of LiMn₂O₄ cathodes.