Journal
NANOSCALE
Volume 9, Issue 17, Pages 5509-5516Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr09959a
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Funding
- NSFC [51572040, 51402112]
- Graduate Scientific Research and Innovation Foundation of Chongqing [CYS16016]
- National High Technology Research and Development Program of China [2015AA034801]
- Fundamental Research Funds for the Central Universities [CQDXWL-2014-001, CQDXWL-2013-012]
- NSFCQ [cstc2015jcyjA20020]
- Science and Technology Research Project of Chongqing Municipal Education Commission of China [KJKJ1400607]
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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.
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