An enhanced stable-structure core-shell coaxial carbon nanofiber web as a direct anode material for lithium-based batteries

A new core-shell coaxial carbon nanofibers web (C-CNFW), exhibiting high carbon purity (without any binders), structural integrity, enhanced stability under different current loads, long cycling life, large reversible capacity (over 520 mA h g− 1), excellent capacity retention and good rate capability, is fabricated by coaxial electrospinning and subsequent carbonization. It is envisaged that the superior electrochemical properties of C-CNFW will make it a promising candidate for the anode material of high-power lithium-ion batteries (LIBs), owing to the unique combinative effects of core carbon material from mineral oil and sheath carbon material from PAN.

Research Highlights
► A novel core-shell coaxial carbon nanofibers web (C-CNFW) is fabricated.
► The C-CNFW presents a reversible capacity about 520 mA h g− 1.
► After 80 cycles, the coaxial structure of the nanofibers is enhanced stable.
► The C-CNFW can keep a desirable structural integrity.