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Electrospun N‐Doped Hierarchical Porous Carbon Nanofiber with Improved Degree of Graphitization for High‐Performance Lithium Ion Capacitor
Author(s) -
Shi Ruiying,
Han Cuiping,
Xu Xiaofu,
Qin Xianying,
Xu Lei,
Li Hongfei,
Li Junqin,
Wong ChingPing,
Li Baohua
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201801345
Subject(s) - electrospinning , nanofiber , materials science , anode , supercapacitor , power density , mesoporous material , cathode , lithium (medication) , chemical engineering , carbon fibers , carbon nanofiber , electrode , energy storage , nanotechnology , porosity , catalysis , composite material , chemistry , capacitance , composite number , power (physics) , organic chemistry , carbon nanotube , polymer , medicine , physics , quantum mechanics , endocrinology , engineering
The lithium‐ion capacitor (LIC) has been regarded as a promising device that combines the merits of lithium‐ion batteries and supercapacitors, and that meets the requirements for both high energy and high power density. The development of advanced electrode materials is the key requirement. Herein, we report the bottom‐up synthesis of activated carbon nanofiber (a‐PANF) with a hierarchical porous structure and a high degree of graphitization. Electrospinning has been employed to prepare an interconnected fiber network with macropores, and ferric acetylacetonate has been introduced as both a mesopore‐creating agent and a graphitic catalyst to increase the degree of graphitization. Furthermore, chemical activation enlarges the specific surface area by producing abundant micropores. Half‐cell evaluation of the as‐prepared a‐PANF gave a discharge capacity of 80 mA h g −1 at 0.1 A g −1 within 2–4.5 V and no capacity fading after 1000 cycles at 2 A g −1 , which represents a significant improvement compared to conventional activated carbon (AC). Furthermore, an as‐assembled LIC with a‐PANF cathode and Fe 3 O 4 anode showed a superior energy density of 124.6 W h kg −1 at a specific power of 93.8 W kg −1 , which remained at 103.7 W h kg −1 at 4687.5 W kg −1 . This indicates promising application potential of a‐PANF as an electrode material for efficient energy storage systems.