Three-dimensional polymer-derived ceramic/graphene paper as a Li-ion battery and supercapacitor electrode

摘要

We study the synthesis and electrochemical performance of molecular precursor-derived ceramic (PDC)/carbon nanotube-embedded graphene self-supporting composite papers as Li-ion battery and supercapacitor electrodes. The composite papers are prepared using vacuum filtration of PDC-graphene oxide (GO) dispersion, followed by thermal reduction at 500 degrees C. Tested as a Li-ion battery electrode, the composite papers deliver a reversible capacity as high as 300 mA h g(-1) (normalized with respect to total mass of the electrode) with negligible capacity loss after 1000 charge/discharge cycles. Boron-doped silicon carbon nitride (Si(B) CN) outperforms its undoped counterpart (SiCN) in terms of rate capability, cyclic stability, and coulombic efficiency. Among the PDC materials analyzed, Si(B) CN-CNT-rGO demonstrates the lowest ohmic resistance and highest specific capacitance of approximately 269.52 F g(-1) at a current density of 5 A g(-1), making it a promising electrode material for electrochemical energy storage applications.