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Related Experiment Videos

Promoting power density by cleaving LiCoO2 into nano-flake structure for high performance supercapacitor.

Qipeng Liu1, Muhammad Sufyan Javed, Cuilin Zhang

  • 1Department of Applied Physics, The State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, P. R. China. hucg@cqu.edu.cn.

Nanoscale
|April 13, 2017
PubMed
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Lithium cobalt oxide (LCO) nano-flakes significantly enhance supercapacitor power density. This novel material offers high capacitance and stability, enabling applications like powering LEDs.

Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium cobalt oxide (LCO) is known for high energy density but limited power density in lithium-ion batteries (LIBs).
  • Improving LCO's power density is crucial for its application in high-performance supercapacitors.
  • Increasing the specific surface area of electrode materials is key to enhancing rate capability through Faradaic redox reactions.

Purpose of the Study:

  • To develop a facile strategy for preparing high-specific-area LCO nano-flakes.
  • To evaluate the electrochemical performance of LCO nano-flakes as an electrode material for supercapacitors.
  • To demonstrate the potential of LCO nano-flakes in flexible, solid-state supercapacitors.

Main Methods:

  • A facile strategy was employed to synthesize LCO nano-flakes with a high specific area.

Related Experiment Videos

  • Electrochemical performance was assessed using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy in LiCl aqueous electrolyte.
  • A full solid-state symmetric supercapacitor was assembled using the LCO nano-flake electrodes.

    • Main Results:

    • LCO nano-flakes exhibited an excellent specific capacitance of 581.3 F g-1 at 0.5 A g-1.
    • The electrode demonstrated high power density (2262 W kg-1 at 41.0 Wh kg-1) and good cycling stability (83.9% retention after 2000 cycles at 6 A g-1).
    • The assembled solid-state symmetric supercapacitor showed good performance, light weight, and flexibility, capable of powering LEDs.

    Conclusions:

    • LCO nano-flakes with high specific area are a promising material for superior supercapacitors.
    • The nano-flake structure facilitates fast redox reactions, significantly boosting power density.
    • This material holds potential for flexible and lightweight energy storage devices.