Hollow multi-nanochannel carbon nanofiber/MoS_(2)nanoflower composites as binder-free lithium-ion battery anodes with high capacity and ultralong-cycle life at large current density

摘要

The electrode materials with high pseudocapacitance can enhance the rate capability and cycling stability of lithium-ion storage devices.Herein,we fabricated MoS_(2)nanoflowers with ultra-large interlayer spacing on N-doped hollow multi-nanochannel carbon nanofibers(F_(2)-MoS_(2)/NHMCFs)as freestanding binder-free anodes for lithium-ion batteries(LIBs).The ultra-large interlayer spacing(0.78~1.11 nm)of MoS_(2)nanoflowers can not only reduce the internal resistance,but also increase accessible active surface area,which ensures the fast Li+intercalation and deintercalation.The NHMCFs with hollow and multi-nanochannel structure can accommodate the large internal strain and volume change during lithiation/delithiation process,it is beneficial to improving the cycling stability of LIBs.Benefiting from the above combined structure merits,the F_(2)-MoS_(2)/NHMCFs electrodes deliver a high rate capability 832 mA h g^(-1)at 10 A g^(-1)and ultralong cycling stability with 99.29 and 91.60%capacity retention at 10 A g^(-1)after 1000 and 2000 cycles,respectively.It is one of the largest capacities and best cycling stability at10 A g^(-1)ever reported to date,indicating the freestanding F2-MoS_(2)/NHMCFs electrodes have potential applications in high power density LIBs.