Larger ionic diameter of Na~+ relative to Li is the main bottleneck in the development of sodium-ion batteries,so many researchers devoted to designing and preparing great electrode materials^.Hard carbon materials are studied widely due to the disordered structure and larger interlayer distance^.However,the rate performance of hard materials in previous reports is desirable to be enhanced.Heteroatom-doped carbon materials have been widely investigated for abundant extrinsic defects and increased interlayer distance.Based on this background,we have prepared polyaniline-based carbon nanospheres(PCSs)by simple pyrolysis treatment of polyaniline nanospheres.PCSs show the good capacitance property and excellent rate performance which are superior to that of other carbon electrode materials in literature.Through structural characterization and detailed analysis,we consider that the excellent electrochemical performance of PCSs is due to high N/O-codoped level,disordered structure,large interlayer distance and distinct superiorities of spherical structure.
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