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A novel LiMn₂O₄-graphene flexible film is successfully prepared by facile vacuum filtration technique. LiMn₂O₄ nanowires with diameters of 50⁻100 nm are distributed homogeneously on graphene sheet matrix. Used as cathode in rechargeable hybrid aqueous batteries, the LiMn₂O₄-graphene film exhibits enhanced electrochemical performance in comparison to LiMn₂O₄-graphene powder. The LiMn₂O₄-graphene film shows stable 13.0 mAh g &amp;minus;1 discharge capacity after 200 cycles at 1.0 C, benefitting from the presence of graphene with strong conductivity and large pore area in this free-standing film. This synthetic strategy for a free-standing film can provide a new avenue for other flexible materials and binder-free electrodes.

Self-Assembly of Free-Standing LiMn2O4-Graphene Flexible Film for High-Performance Rechargeable Hybrid Aqueous Battery