Secondary-Phase Stochastics in Lithium-Ion Battery Electrodes

Kandler Smith, Aashutosh Mistry, Partha Mukherjee

Research output: Contribution to journalArticlepeer-review

122 Scopus Citations

Abstract

Lithium-ion battery electrodes exhibit complex interplay among multiple electrochemically coupled transport processes, which rely on the underlying functionality and relative arrangement of different constituent phases. The electrochemically inactive solid phases (e.g., conductive additive and binder, referred to as the secondary phase), while beneficial for improved electronic conductivity and mechanical integrity, may partially block the electrochemically active sites and introduce additional transport resistances in the pore (electrolyte) phase. In this work, the role of mesoscale interactions and inherent stochasticity in porous electrodes is elucidated in the context of short-range (interface) and long-range (transport) characteristics. The electrode microstructure significantly affects kinetically and transport-limiting scenarios and thereby the cell performance. The secondary-phase morphology is also found to strongly influence the microstructure-transport-kinetics interactions. Apropos, strategies have been proposed for performance improvement via electrode microstructural modifications.

Original languageAmerican English
Pages (from-to)6317-6326
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number7
DOIs
StatePublished - 2018

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

NREL Publication Number

  • NREL/JA-5400-70743

Keywords

  • conductive binder
  • electrochemically active area
  • electrode microstructural characterization
  • Li-ion battery
  • porous composite electrode
  • secondary-phase morphology

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