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Issue 17, 2017
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Promoting power density by cleaving LiCoO2 into nano-flake structure for high performance supercapacitor

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Abstract

LiCoO2 (LCO) usually can deliver high energy density but low power density in Li-ion batteries (LIBs). Whether LCO could be used as electrode material for high-performance supercapacitors is dependent on promoting its power density. Owing to Faradaic redox reactions taking place on its surfaces or inside crystals through ion intercalation/deintercalation from the surfaces, increasing the specific area of LCO is a key factor to promote its rate capability. Herein, we report a facile strategy to prepare LCO nano-flakes with high specific area exceeding that of currently used micro-scale particles in LIBs. LCO as a nano-flake structure is expected to have a high fraction of Li atom exposure, which benefits fast redox reactions taking place on the surfaces. An LCO-based electrode exhibits an excellent specific capacitance of 581.3 F g−1 at 0.5 A g−1, high power density of 2262 W kg−1 at an energy density of 41.0 Wh kg−1, and good cycling stability (83.9% capacitance retention at 6 A g−1 after 2000 cycles) in LiCl aqueous electrolyte. Faradaic redox behaviors have been analyzed, indicating an ideal diffusion-controlled process. Moreover, a full solid-state symmetric supercapacitor is assembled using LCO nano-flake-based electrodes, which presents good performance with light weight and flexibility. Impressively, three charged supercapacitors in series can light 100 green light emitting diodes for 14 min. LCO in nano-flake structure form with high power density could be an excellent material for superior supercapacitors.

Graphical abstract: Promoting power density by cleaving LiCoO2 into nano-flake structure for high performance supercapacitor

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Publication details

The article was received on 28 Dec 2016, accepted on 22 Mar 2017 and first published on 29 Mar 2017


Article type: Paper
DOI: 10.1039/C6NR09959A
Citation: Nanoscale, 2017,9, 5509-5516
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    Promoting power density by cleaving LiCoO2 into nano-flake structure for high performance supercapacitor

    Q. Liu, M. S. Javed, C. Zhang, Y. Li, C. Hu, C. Zhang, M. Lai and Q. Yang, Nanoscale, 2017, 9, 5509
    DOI: 10.1039/C6NR09959A

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