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N-Enriched carbon nanofibers for high energy density supercapacitors and Li-ion batteries

机译：用于高能量密度超级电容器和锂离子电池的富氮碳纳米纤维

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Nitrogen enriched carbon nanofibers have been obtained by one-step carbonization/activation of PAN-based nanofibers with various concentrations of melamine at 800 °C under a N _(2) atmosphere. As synthesised carbon nanofibers were directly used as electrodes for symmetric supercapacitors. The obtained PAN-MEL fibers with 5% melamine stabilised at 280 °C and carbonized at 800 °C under a nitrogen atmosphere showed excellent electrochemical performance with a specific capacitance of up to 166 F g ~(?1) at a current density of 1A g ~(?1) using 6 M KOH electrolyte and a capacity retention of 109.7% after 3000 cycles. It shows a 48% increase as compared to pristine carbon nanofibers. Two electrode systems of the CNFM5 sample showed high energy densities of 23.72 to 12.50 W h kg ~(?1) at power densities from 400 to 30?000 W kg ~(?1) . When used as an anode for Li-ion battery application the CNFM5 sample showed a high specific capacity up to 435.47 mA h g ~(?1) at 20 mA g ~(?1) , good rate capacity and excellent cycling performance (365 mA h g ~(?1) specific capacity even after 200 cycles at 100 mA g ~(?1) ). The specific capacity obtained for these nitrogen enriched carbon nanofibers is higher than that for pristine carbon nano-fibers.
机译：通过在N _（2）气氛下在800°C下用不同浓度的三聚氰胺对PAN基纳米纤维进行一步碳化/活化，可以获得富氮的碳纳米纤维。作为合成碳纳米纤维，直接用作对称超级电容器的电极。所获得的具有5％三聚氰胺的PAN-MEL纤维在280°C的温度下稳定并在氮气氛下在800°C的温度下碳化，显示出优异的电化学性能，在1A的电流密度下比电容高达166 F g〜（？1）使用6 M KOH电解质处理g〜（？1），经过3000次循环后容量保持率为109.7％。与原始碳纳米纤维相比，它显示出48％的增长。 CNFM5样品的两个电极系统在功率密度为400至30？000 W kg〜（？1）时显示出23.72至12.50 W h kg〜（？1）的高能量密度。当用作锂离子电池应用的阳极时，CNFM5样品在20 mA g〜（？1）时显示出高达435.47 mA hg〜（？1）的高比容量，良好的倍率容量和出色的循环性能（365 mA hg）甚至在100 mA g〜（？1）的200个循环后仍达到〜（？1）比容量。这些富氮碳纳米纤维的比容量高于原始碳纳米纤维的比容量。

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