Open AccessGuidelines for Optimizing the Architecture of Battery Insertion Electrodes with Ohmic Surface, Coating, or Electrolyte Resistances
Author(s) -
Robert Usiskin,
Joachim Maier
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ab8649
Subject(s) - electrolyte , ohmic contact , electrode , materials science , coating , particle size , nernst equation , particle (ecology) , ion , separator (oil production) , nanotechnology , chemistry , thermodynamics , physics , oceanography , organic chemistry , geology
This work analyzes galvanostatic charging of a single-phase storage particle where the insertion kinetics are limited by solid-state diffusion combined with an ohmic resistance at the particle surface, in a coating (or SEI), or in the electrolyte. Using the Nernst-Planck formalism, the “optimal” dimensions in six particle geometries are derived as a function of the material transport properties. Special attention is given to geometries in which ions and electrons are transported over different length scales (“wiring lengths”). The results yield quantitative guidelines for the optimal particle size and carbon spacing in a battery insertion electrode. A strategy for increasing electrode thickness based on a particle size gradient is also discussed.