Machine Learning Solvation Environments in Conductive Polymers: Application to ProDOT-2Hex with Solvent Swelling

Automated identification and classification of ion-solvation sites in diverse chemical systems will improve the understanding and design of polymer electrolytes for battery applications. We introduce a machine learning approach to classify and characterize ion-solvation environments based on feature...

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Bibliographic Details
Published in:Macromolecules 2021-04, Vol.54 (7), p.3377-3387
Main Authors: Magdău, Ioan-Bogdan, Miller, Thomas F
Format: Article
Language:English
Subjects:
Polymer Science
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Summary:Automated identification and classification of ion-solvation sites in diverse chemical systems will improve the understanding and design of polymer electrolytes for battery applications. We introduce a machine learning approach to classify and characterize ion-solvation environments based on feature vectors extracted from all-atom simulations. This approach is demonstrated in poly­(3,4-propylenedioxythiophene), which is a promising candidate polymer binder for Li-ion batteries. In the dry polymer, four distinct Li+ solvation environments are identified close to the backbone of the polymer. Upon swelling of the polymer with propylene carbonate solvent, the nature of Li+ solvation changes dramatically, featuring a rapid diversification of solvation environments. This application of machine learning can be generalized to other polymer condensed-phase systems to elucidate the molecular mechanisms underlying ion solvation.
ISSN:0024-9297
1520-5835
DOI:10.1021/acs.macromol.0c02132