Abstract
A novel network of spindle-like carbon nanofibers was fabricated via a simplified synthesis involving electrospinning followed by preoxidation in air and postcarbonization in Ar. Not only was the as-obtained carbon network comprised of beads of spindle-like nanofibers but the cubic MnO phase and N elements were successfully anchored into the amorphous carbon matrix. When directly used as a binder-free anode for lithium-ion batteries, the network showed excellent electrochemical performance with high capacity, good rate capacity and reliable cycling stability. Under a current density of 0.2 A g−1, it delivered a high reversible capacity of 875.5 mAh g−1 after 200 cycles and 1005.5 mAh g−1 after 250 cycles with a significant coulombic efficiency of 99.5%.
Highlights
Lithium-ion batteries (LIBs) have been identified as one of the most advanced inventions in high energy density storage devices and are extensively utilized in various electronic systems for mobile phones, computers and vehicles [1,2,3]
The electrochemical performance of the beaded nanofiber carbon network anchored with Manganese oxide (MnO) and N was investigated as a working electrode of CR2032-type coin cell with lithium foil as the counter and reference electrodes
Based on the above analysis, such a reliable electrochemical performance of the enhanced reversible capacity, the good rate capacity and significant cycle stability may be mainly attributed to the high theoretical capacity of MnO, the improved conductivity of carbon anchored with N, and the robust beaded nanofiber network with structural endurance that effectively alleviates the volume change of the electrode during lithium insertion–extraction
Summary
Lithium-ion batteries (LIBs) have been identified as one of the most advanced inventions in high energy density storage devices and are extensively utilized in various electronic systems for mobile phones, computers and vehicles [1,2,3]. Wang et al and Zhao et al claimed that the electrospun MnO–C composite nanofibers preformed high reversible capacities of 663 and 1082 mAh g−1, respectively, at a current density of 0.1 A g−1 [5,13].
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