Open AccessThick Sintered Electrode Lithium-Ion Battery Discharge Simulations: Incorporating Lithiation-Dependent Electronic Conductivity and Lithiation Gradient Due to Charge Cycle
Author(s) -
Chen Cai,
Ziyang Nie,
J. Pierce Robinson,
Daniel S. Hussey,
Jacob M. LaManna,
David L. Jacobson,
Gary M. Koenig
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/abc747
Subject(s) - electrode , materials science , battery (electricity) , lithium (medication) , conductivity , electrochemistry , ion , ionic conductivity , lithium ion battery , composite material , analytical chemistry (journal) , chemistry , thermodynamics , electrolyte , medicine , power (physics) , physics , organic chemistry , endocrinology , chromatography
In efforts to increase the energy density of lithium-ion batteries, researchers have attempted to both increase the thickness of battery electrodes and increase the relative fractions of active material. One system that has both of these attributes are sintered thick electrodes comprised of only active material. Such electrodes have high areal capacities, however, detailed understanding is needed of their transport properties, both electronic and ionic, to better quantify their limitations to cycling at higher current densities. In this report, efforts to improve models of the electrochemical cycling of sintered electrodes are described, in particular incorporation of matrix electronic conductivity which is dependent on the extent of lithiation of the active material and accounting for initial gradients in lithiation of active material in the electrode that develop as a consequence of transport limitations during charging cycles. Adding in these additional considerations to a model of sintered electrode discharge resulted in improved matching of experimental cell measurements.