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Title: Quantifying Negative Effects of Carbon-Binder Networks from Electrochemical Performance of Porous Li-Ion Electrodes

Journal Article · · Journal of the Electrochemical Society
ORCiD logo [1]; ORCiD logo [2];  [2];  [2];  [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Argonne National Lab. (ANL), Lemont, IL (United States); Purdue Univ., West Lafayette, IN (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Purdue Univ., West Lafayette, IN (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States). Joint Center for Energy Storage Research (JCESR); Argonne National Lab. (ANL), Lemont, IL (United States). Argonne Collaborative Center for Energy Storage Science

Porous Li-ion electrodes contain active particles, ion transporting electrolyte, and carbon-binder networks. While macrohomogeneous models are often used to predict electrode behavior, accurate predictions remain challenging, owing to the incomplete understanding of the critical role of carbon-binder networks and how they affect the electrochemical response. The present study systematically characterizes these effects in terms of effective properties by utilizing macrohomogeneous models to analyze the measured responses for electrodes with different carbon-binder content, electrode thickness, and porosity but with identical materials. We find that the impact of the carbon-binder network is more severe than previously thought. Even for low carbon-binder content (5 %wt. dry electrode), the presence of the network decreases the reaction area and increases the ion transport resistance, negatively impacting electrode performance. These effects scale with not just porosity or active material volume but also with carbon-binder content. The findings underscore the importance of connecting all effective properties to electrode specifications in a full factorial sense to transform the electrode design paradigm.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1831722
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 7 Vol. 168; ISSN 0013-4651
Publisher:
IOP Publishing - The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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