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  • Title: Mesh-Like Carbon Nanosheets with High-Level Nitrogen Doping for High-Energy Dual-Carbon Lithium-Ion Capacitors.
    Author: Li Z, Cao L, Chen W, Huang Z, Liu H.
    Journal: Small; 2019 Apr; 15(15):e1805173. PubMed ID: 30861630.
    Abstract:
    Li-ion capacitors (LICs) have demonstrated great potential for bridging the gap between lithium-ion batteries and supercapacitors in electrochemical energy storage area. The main challenge for current LICs (contain a battery-type anode as well as a capacitor-type cathode) lies in circumventing the mismatched electrode kinetics and cycle degradation. Herein, a mesh-like nitrogen (N)-doped carbon nanosheets with multiscale pore structure is adopted as both cathode and anode for a dual-carbon type of symmetric LICs to alleviate the above mentioned problems via a facile and green synthesis approach. With rational design, this dual-carbon LICs exhibits a broad high working voltage window (0-4.5 V), an ultrahigh energy density of 218.4   Wh   kg - 1 electrodes ( 229.8   Wh   L - 1 electrodes ), the highest power density of 22.5   kW   kg - 1 electrodes ( 23.7   kW   L - 1 electrodes ) even under an ultrahigh energy density of 97.5   Wh   kg - 1 electrodes ( 102.6   Wh   L - 1 electrodes ), as well as reasonably good cycling stability with capacity retention of 84.5% (only 0.0016% capacity loss per cycle) within 10 000 cycles under a high current density of 5 A g-1 . This study provides an efficient method and option for the development of high performance LIC devices.
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