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Effects of an Integrated Separator/Electrode Assembly on Enhanced Thermal Stability and Rate Capability of Lithium-Ion Batteries

Title
Effects of an Integrated Separator/Electrode Assembly on Enhanced Thermal Stability and Rate Capability of Lithium-Ion Batteries
Authors
Gong, SeokhyeonJeon, HyunkyuLee, HoogilRyou, Myung-HyunLee, Yong Min
DGIST Authors
Lee, Yong Min
Issue Date
2017-05
Citation
ACS Applied Materials and Interfaces, 9(21), 17814-17821
Type
Article
Article Type
Article
Keywords
BindersCarbonateCellsCoatingsComposite SeparatorsCycling PerformanceElectric BatteriesElectric DischargesElectrode Integrated SeparatorElectrodesInitial Discharge CapacitiesIntegrated ElectrodesIntegrationIntegrationInterfacial PropertyIonsLayerLi IonLithiumLithium Ion BatteriesLithium Ion BatteriesLithium CompoundsPlastic CoatingsPoly(Vinylidene Fluoride)Polyethylene SeparatorsPolymeric AdhesiveRate CapabilitiesSecondary BatteriesSeparator Integrated ElectrodeSeparatorsSpray Coating TechniquesTemperatureThermal ShrinkageThermal ShrinkageThermodynamic Stability
ISSN
1944-8244
Abstract
To improve the rate capability and safety of lithium-ion batteries (LIBs), we developed an integrated separator/electrode by gluing polyethylene (PE) separators and electrodes using a polymeric adhesive (poly(vinylidene fluoride), PVdF). To fabricate thin and uniform polymer coating layers on the substrate, we applied the polymer solution using a spray-coating technique. PVdF was chosen because of its superior mechanical properties and stable electrochemical properties within the voltage range of commercial LIBs. The integrated separator/electrode showed superior thermal stability compared to that of the control PE separators. Although PVdF coating layers partially blocked the porous structures of the PE separators, resulting in reduced ionic conductivity (control PE = 0.666 mS cm-1, PVdF-coated PE = 0.617 mS cm-1), improved interfacial properties between the separators and the electrodes were obtained due to the intimate contact, and the rate capabilities of the LIBs based on integrated separators/electrodes showed 176.6% improvement at the 7 C rate (LIBs based on PVdF-coated and control PE maintained 48.4 and 27.4% of the initial discharge capacity, respectively). © 2017 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/4727
DOI
10.1021/acsami.7b00044
Publisher
American Chemical Society
Related Researcher
Files:
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Collection:
Energy Science and EngineeringETC1. Journal Articles


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