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Mechanical robustness of composite electrode for lithium ion battery: Insight into entanglement & crystallinity of polymeric binder

Title
Mechanical robustness of composite electrode for lithium ion battery: Insight into entanglement & crystallinity of polymeric binder
Authors
Byun, SeoungwooJaecheol ChoiRoh, YoungjoonDanoh SongMyung-Hyun RyouLee, Yong Min
DGIST Authors
Lee, Yong Min
Issue Date
2020-02
Citation
Electrochimica Acta, 332
Type
Article
Article Type
Article
Author Keywords
Molecular weightPolyvinylidene fluorideAdhesion propertiesComposite electrodeSAICAS
Keywords
CUTTING ANALYSIS SYSTEMADHESION PROPERTIESPERFORMANCETEMPERATURECATHODEANODESCHALLENGESSEPARATORSPROPERTYBEHAVIOR
ISSN
0013-4686
Abstract
To investigate the correlation between the molecular weight of the polymeric binder in Li-ion battery electrodes and their adhesion properties, polyvinylidene fluoride (PVdF) with three different molecular weights of 500,000, 630,000, and 1,000,000 are selected for LiCoO2 electrode fabrication. Using a surface and interfacial cutting analysis system, it is observed that, as the molecular weight of the PVdF increases, the adhesion strength not only in the electrode composite, but also at the electrode/current collector interface increases. This enhancement can be attributed to the increased polymeric chain entanglement and higher crystallinity of PVdF with higher molecular weight, which is confirmed using a microfluidic viscometer and differential scanning calorimeter, respectively. In summary, regardless of slightly higher electrode resistance, the LiCoO2 electrode with a PVdF binder of high molecular weight shows better electrochemical performance during cycling test even at 60 °C due to its stable mechanical integrity. © 2019 Elsevier Ltd
URI
http://hdl.handle.net/20.500.11750/11404
DOI
10.1016/j.electacta.2019.135471
Publisher
Pergamon Press Ltd.
Related Researcher
  • Author Lee, Yong Min Battery Materials & Systems LAB
  • Research Interests Battery; Electrode; Electrolyte; Separator; Simulation
Files:
There are no files associated with this item.
Collection:
Department of Energy Science and EngineeringBattery Materials & Systems LAB1. Journal Articles


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