Controllable Assembly of Hybrid Electrodes by Electrophoretic Deposition for High-Performance Battery-Supercapacitor Hybrid Devices

Yu Ouyang, Ori Geuli, Qingli Hao*, Daniel Mandler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Hybrid electrodes, which are made of a physical (electrical double layer) storage component and a chemical (battery-type) material, have shown great potential in battery-supercapacitor hybrid (BSH) devices. Here, we present an approach which is based on electrophoretic deposition (EPD) as a means of assembling a binder-free, high-performance BSH device. Ketjenblack (KB) used as the physical storage material and NiCo2O4 (NCO) as the chemical storage compound were dispersed in the presence of Ni2+. The latter assisted in positively charging the surface of both materials and thus resulted in similar deposition rates by EPD on nickel foam (NF). This enabled us to nicely control the NCO to KB ratio in the hybrid electrode and optimize its performance. In this binder-free hybrid electrode, the KB chains served as a fast electron path providing high conductivity for the NCO electroactive material. More importantly, the KB chains could remain in contact with NCO coping with the mechanical stress during the electrochemical reaction. As a result, the optimized hybrid electrode showed high specific capacity (460 C g-1 at 1 A g-1) and excellent cycling performance (82.5% retention after 15 000 cycles). The BSH device was assembled with the hybrid electrode (NF/NCO-KB) as positive and activated carbon as negative electrodes, and exhibited high energy density of 53.0 Wh kg-1 at power density of 746 W kg-1 and outstanding cycling performance of 88.6% retention after 10 000 cycles.

Original languageAmerican English
Pages (from-to)1784-1793
Number of pages10
JournalACS Applied Energy Materials
Volume3
Issue number2
DOIs
StatePublished - 24 Feb 2020

Bibliographical note

Publisher Copyright:
© 2020 American Chemical Society.

Keywords

  • Electrophoretic deposition
  • cycling stability
  • fast ion/charge transfer
  • hybrid device
  • hybrid electrode

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