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Flexible Cellulose Paper‐based Asymmetrical Thin Film Supercapacitors with High‐Performance for Electrochemical Energy Storage
Author(s) -
Feng JinXian,
Ye ShengHua,
Wang AnLiang,
Lu XueFeng,
Tong YeXiang,
Li GaoRen
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201401876
Subject(s) - materials science , supercapacitor , non blocking i/o , electrode , graphite , capacitance , electrochemistry , power density , fabrication , carboxymethyl cellulose , energy storage , composite material , nanotechnology , chemical engineering , metallurgy , catalysis , power (physics) , physics , alternative medicine , engineering , medicine , chemistry , quantum mechanics , pathology , biochemistry , sodium
Cellulose paper (CP)‐based asymmetrical thin film supercapacitors (ATFSCs) have been considered to be a novel platform for inexpensive and portable devices as the CP is low‐cost, lightweight, and can be rolled or folded into 3D configurations. However, the low energy density and poor cycle stability are serious bottlenecks for the development of CP‐based ATFSCs. Here, sandwich‐structured graphite/Ni/Co 2 NiO 4 ‐CP is developed as positive electrode and the graphite/Ni/AC‐CP as negative electrode for flexible and high‐performance ATFSCs. The fabricated graphite/Ni/Co 2 NiO 4 ‐CP positive electrode shows a superior areal capacitance (734 mF/cm 2 at 5 mV/s) and excellent cycling performance with ≈97.6% C sp retention after 15 000 cycles. The fabricated graphite/Ni/AC‐CP negative electrode also exhibits large areal capacitance (180 mF/cm 2 at 5 mV/s) and excellent cycling performance with ≈98% C sp retention after 15 000 cycles. The assembled ATFSCs based on the sandwich‐structured graphite/Ni/Co 2 NiO 4 ‐CP as positive electrode and graphite/Ni/AC‐CP as negative electrode exhibit large volumetric C sp (7.6 F/cm 3 at 5 mV/s), high volumetric energy density (2.48 mWh/cm 3 , 80 Wh/kg), high volumetric power density (0.79 W/cm 3 , 25.6 kW/kg) and excellent cycle stability (less 4% C sp loss after 20 000 cycles). This study shows an important breakthrough in the design and fabrication of high‐performance and flexible CP‐based electrodes and ATFSCs.