Abstract
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−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.
Highlights
Some work has discussed the positive effect on the electrochemical properties of graphene-based LiFePO4 or LiMn2O4 composites [12–14]
It is worth noting that most of this work is focused on powder graphene composites and their application in lithium rechargeable batteries with organic electrolyte
Graphene oxide (GO) was synthesized by natural flake graphite according to previous work [18]
Summary
Materials 2018, 11, 1056 the electrochemical properties of pristine LiFePO4 or LiMn2O4 cathodes often deteriorate drastically with increasing of charge-discharge rates. To overcome these issues, one of the effective strategies is anchoring the active LiFePO4 or LiMn2O4 particles into various porous carbon matrixes to enhance the electrical conductivity and suppress the volume change during cycling [10–12]. Some work has discussed the positive effect on the electrochemical properties of graphene-based LiFePO4 or LiMn2O4 composites [12–14]. It is worth noting that most of this work is focused on powder graphene composites and their application in lithium rechargeable batteries with organic electrolyte. Few works have discussed graphene-based flexible film electrodes for rechargeable hybrid aqueous batteries
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