As the increased demand of eco-friendly rechargeable batteries in recent years, aqueous/non-aqueous lithium-air batteries have been attached more and more attention because of their high specific energy density, 3-5 times higher than that of lithium-ion batteries^1-2. As the key component, the structure of the air cathode should been optimized to improve the cycle performance during discharge and charge process^3-4. In this work, polyaniline-assisted polyvinylidene fluoride film was synthesized coated on graphene sponge as flexible cathode for lithium air batteries. With the 3D inter-connected structure of the graphene sponge for the guidance of oxygen flows, the assisted polyaniline for enhanced electron transfer, as well as the polyvinylidene fluoride film for the prevention of electrolyte flooding, the reaction zone can be reserved extremely during oxygen reduction reaction and oxygen evolution reaction, which can then promote charge transfer, and result to the lower overpotential for both discharge and charge process. The detailed electrochemical performance will be analyzed in the following presentation.

References

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[2] Luntz, A. C.; McCloskey, B. D. Nonaqueous Li-air Batteries: a Status Report. Chem. Rev. 2014, 114, 11721-11750.

[3] Wen, Z.; Shen, C.; Lu, Y. Air Electrode for the Lithium-Air Batteries: Materials and Structure Designs. ChemPlusChem 2015, 80, 270-287.

[4] Wang, X.; Wen, K.; Song, Y.; Ye, L.; Zhang, K. H. L.; Pan, Y.; Lv, W.; Liao, Y.; He, W. Gas Transport Evaluation in Lithium–air Batteries with Micro/nano-structured Cathodes. J. Power Sources 2015, 274, 762-767.