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Structurally modified V2O5based extrinsic pseudocapacitor.

Himadri Raha1, Debabrata Pradhan1,2, Prasanta Kumar Guha1,3

  • 1School of Nano Science and Technology, Indian Institute of Technology Kharagpur-721302, India.

Nanotechnology
|March 15, 2022
PubMed
Summary
This summary is machine-generated.

Researchers enhanced lithium-ion battery electrodes by inducing pseudocapacitance in vanadium pentoxide (V2O5) particles. This structural modification improves energy storage performance and device longevity.

Keywords:
Li-ion supercapacitorPAM-Li2SO4SAED patternextrinsic pseudocapacitorgel electrolytestructural modification of V2O5

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Energy storage systems require architectural and material redesign to meet evolving demands.
  • Integrating capacitive behavior into batteries enhances lifetime and power efficiency.
  • Electrode material properties like particle size and chemical structure influence charge storage.

Purpose of the Study:

  • To transform a vanadium pentoxide (V2O5)-based lithium-ion battery electrode into a lithium-ion pseudocapacitive electrode.
  • To investigate the effect of structural modifications on V2O5 for improved energy storage.
  • To optimize V2O5 particle size for enhanced pseudocapacitive performance.

Main Methods:

  • Structural modification of V2O5 via optimized reaction pressure to create particles of varying sizes (V2O5-L, V2O5-M, V2O5-S).
  • Analysis of electrochemical behavior using galvanostatic charge-discharge and cyclic voltammetry (CV) plots.
  • Fabrication of energy storage devices using the modified V2O5 material.

Main Results:

  • Smaller V2O5 particles (V2O5-S) exhibited flattened charge-discharge plateaus and less intense redox peaks in CV plots, indicating pseudocapacitance.
  • V2O5-S demonstrated significant improvements in rate capabilities and stability.
  • Fabricated devices achieved a volumetric energy density of 4.36 mWh cm-3 and a volumetric power density of 125 mW cm-3.
  • The device maintained 95% capacitance after 10,000 cycles and 63% after 25,000 cycles.

Conclusions:

  • Structural optimization of V2O5 by controlling particle size effectively induces pseudocapacitance.
  • The V2O5-S material shows promise for high-performance and long-lasting energy storage applications.
  • This approach offers a viable strategy for enhancing lithium-ion battery electrode performance.