Internal resistance mapping preparation to optimize electrode thickness and density using symmetric cell for high-performance lithium-ion batteries and capacitors

Kazuaki Kisu, Shintaro Aoyagi, Haruka Nagatomo, Etsuro Iwama, McMahon Thomas Homer Reid, Wako Naoi, Katsuhiko Naoi

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Methods for characterizing and optimizing the internal resistance of electrodes are crucial for achieving the simultaneous goals of high energy density and high power density in lithium-ion batteries. In this study we propose—and confirm the efficacy of—a method for electrode design optimization based on the construction of an internal resistance map, a visualization tool for minimizing electrode resistance. The construction of the map proceeds by identifying the three primary components of the electrode resistance—charge-transfer resistance, ionic resistance, and contact resistance—and elucidating the dependence of each component on electrode density and thickness. We fabricate electrode sheets of various densities and thicknesses and conduct electrode impedance spectroscopy (EIS) measurements to measure the dependence of internal resistance on density and thickness, which we characterize via empirical formulas incorporated into our internal resistance map. Using our map, we predict that the resistance per unit area of a nickel-cobalt- manganese (NCM) electrode attains its minimum value at thickness 70 μm and density 2.9 g cm−3. We then further use the map to predict variations in IR drop for NCM electrodes of different densities, obtaining results in excellent agreement with experimental measurements.

Original languageEnglish
Pages (from-to)207-212
Number of pages6
JournalJournal of Power Sources
Volume396
DOIs
Publication statusPublished - 2018 Aug 31
Externally publishedYes

Keywords

  • Composite electrode
  • Electrode density
  • Internal resistance
  • Lithium-ion batteries
  • Symmetric cell

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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