Analysis of LiCoO2electrodes through principal component analysis of current-voltage datacubes measured using atomic force microscopy

Yasushi Maeda, Noboru Taguchi, Hikari Sakaebe

Research output: Contribution to journalArticlepeer-review

Abstract

This study aimed to reveal the electrical characteristics of the composite electrodes of Li-ion batteries. LiCoO2 electrodes were analyzed using atomic force microscopy, and three-dimensional datasets of current-voltage (I-V) curves (IV-datacubes) were obtained. The IV-datacubes were then analyzed using principal component analysis to determine the typical I-V curve corresponding to each LiCoO2 particle on a statistical basis. Detailed analysis based on the thermionic emission model with series resistance showed that some of the particles exhibited poor electrical contact in the electrode. Overall, the obtained results suggested that our IV-datacube analysis can reveal the characteristics of buried electrical contacts within electrodes, which is otherwise difficult to accomplish using alternative methods. We, therefore, believe that the method presented herein is a promising analytical method for composite electrodes.

Original languageEnglish
Article number012402
JournalJournal of Vacuum Science and Technology B: Nanotechnology and Microelectronics
Volume39
Issue number1
DOIs
Publication statusPublished - Jan 1 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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