Effect of Substrate Permeability on Scanning Ion Conductance Microscopy: Uncertainty in Tip–Substrate Separation and Determination of Ionic Conductivity

Composite electrodes can significantly improve the performance of an electrochemical device by maximizing surface area and active material loading. Typically, additives such as carbon are used to improve conductivity and a polymer is used as a binder, leading to a heterogeneous surface film with thi...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2019-12, Vol.91 (24), p.15718-15725
Main Authors: Payne, Nicholas A, Dawkins, Jeremy I. G, Schougaard, Steen B, Mauzeroll, Janine
Format: Article
Language:English
Subjects:
Additives
Analytical chemistry
Chemistry
Conductance
Conduction
Conductivity
Electrochemistry
Electrodes
Ion currents
Lithium
Lithium-ion batteries
Mapping
Micrometers
Microscopy
Performance enhancement
Permeability
Porosity
Rechargeable batteries
Substrates
Surface area
Thickness
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Description
Summary:Composite electrodes can significantly improve the performance of an electrochemical device by maximizing surface area and active material loading. Typically, additives such as carbon are used to improve conductivity and a polymer is used as a binder, leading to a heterogeneous surface film with thickness on the order of 10s of micrometers. For such composite electrodes, good ionic conduction within the film is critical to capitalize on the increased loading of active material and surface area. Ionic conductivity within a film can be tricky to measure directly, and homogenization models based on porosity are often used as a proxy. SICM has traditionally been a topography-mapping microscopy method for which we here outline a new function and demonstrate its capacity for measuring ion conductivity within a lithium-ion battery film.
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.9b03907