Issue 20, 2017

CNT-threaded N-doped porous carbon film as binder-free electrode for high-capacity supercapacitor and Li–S battery

Abstract

A novel lightweight, free-standing, CNT-threaded nitrogen-doped porous carbon film (CNCF) has been synthesized as a binder-free electrode for supercapacitor and Li–S battery. The meticulous structural design of using CNT to thread the ZIF-8-derived porous carbon polyhedrons together endows the porous carbon thin film with nice flexibility, high surface area (645.2 m2 g−1), and hierarchical pore structure as well as good nitrogen doping (2.8 at%) and overall electrical conductivity. When used as binder-free electrode for a supercapacitor, the CNCF delivers a high specific capacitance of 340 F g−1 at 2 A g−1, long-term stability with a coulombic efficiency of 97.7% after 10 000 cycles at 20 A g−1, and high energy density of 21.1 W h kg−1 with a power density of 5000 W kg−1. It can also serve as an efficient sulfur host for the Li–S battery. The S@CNCF electrode exhibits a high discharge capacity of 926 mA h g−1 after 200 cycles at 1C, and 614 mA h g−1 after 1800 cycles with an ultra-low overall capacity decay of 0.02%/cycle with sulfur loading of 3 mg cm−2. Moreover, when the sulfur loading is increased to 6.9 mg cm−2, the electrode shows a high initial areal capacity of 7.3 mA h cm−2 and a volumetric capacity of 0.94 A h cm−3. This film holds promising potential for flexible or film-like high-energy storage systems.

Graphical abstract: CNT-threaded N-doped porous carbon film as binder-free electrode for high-capacity supercapacitor and Li–S battery

Supplementary files

Article information

Article type
Paper
Submitted
19 Feb 2017
Accepted
18 Apr 2017
First published
18 Apr 2017

J. Mater. Chem. A, 2017,5, 9775-9784

CNT-threaded N-doped porous carbon film as binder-free electrode for high-capacity supercapacitor and Li–S battery

Y. Liu, G. Li, Z. Chen and X. Peng, J. Mater. Chem. A, 2017, 5, 9775 DOI: 10.1039/C7TA01526G

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