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Mesh‐Like Carbon Nanosheets with High‐Level Nitrogen Doping for High‐Energy Dual‐Carbon Lithium‐Ion Capacitors
Author(s) -
Li Zhao,
Cao Liujun,
Chen Wei,
Huang Zechuan,
Liu Hao
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201805173
Subject(s) - anode , materials science , capacitor , supercapacitor , cathode , carbon fibers , energy storage , lithium (medication) , electrochemistry , current density , electrode , nanotechnology , battery (electricity) , optoelectronics , chemical engineering , voltage , electrical engineering , composite material , power (physics) , chemistry , composite number , medicine , physics , quantum mechanics , endocrinology , engineering
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 – 1electrodes( 229.8 Wh L – 1electrodes), the highest power density of 22.5 kW kg – 1electrodes( 23.7 kW L – 1electrodes) even under an ultrahigh energy density of 97.5 Wh kg – 1electrodes( 102.6 Wh L – 1electrodes), 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.