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Understanding the adhesion properties of polymeric binders in LIB composite electrodes by liquid electrolyte impregnation

Title
Understanding the adhesion properties of polymeric binders in LIB composite electrodes by liquid electrolyte impregnation
Authors
Lee, Yong Min
DGIST Authors
Lee, Yong Min
Issue Date
2019-11-26
Citation
Asian Conference on Electrochemical Power Sources 2019
Type
Conference
Abstract
Polymeric binders are essential for fabricating composite electrodes of lithium-ion batteries (LIBs), because large amount of nano- or micron-sized particles of active materials or conducting agents have to be fixed on the surface of current collectors. However, in general, since the polymeric binders are electrically insulating and electrochemically inert, their amount in the electrode should be minimized to maximize the energy density of LIBs. From this point of view, in order to ensure the reliable physical contact between the active material and the current collector even in liquid electrolyte impregnation, not only the intrinsic adhesion strength of the binder but also its uniform distribution within the electrode must be controlled However, with the conventional peel test, it is almost impossible to investigate the adhesion properties under wet condition. So, here, we introduce ground-breaking results about how the adhesion strengths of LIB electrodes change with liquid electrolyte impregnation using surface and interfacial cutting analysis system (SAICAS, Daipla Witnes, Japan). The SAICAS can control the velocity or force of the microblade of the width of 1mm during cutting and peeling while measuring vertical or horizontal forces. The horizontal force during the peeling can be converted into adhesion strengths at the interface or arbitrary depth in the electrode. With LiCoO2 electrodes (LiCoO2:Super P Li®:PVdF=90:5:5, wt%, loading level=20 mg cm-2, electrode density=3.6 g cm-3), we compared their adhesion strengths in dry or wet (1.15M LiPF6 in EC/EMC=3/7, v/v). Also, some strategies are proposed in which the crystalline phase or distributions of binders can be controlled to improve the adhesion strength even in the wet state. We therefore emphasize the importance of understanding and controlling the adhesive and physical properties of binders in improving the electrochemical reliability of LIB electrodes.
URI
http://hdl.handle.net/20.500.11750/14122
Publisher
Asian Conference on Electrochemical Power Sources
Related Researcher
  • Author Lee, Yong Min Battery Materials & Systems LAB
  • Research Interests Battery; Electrode; Electrolyte; Separator; Simulation
Files:
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Collection:
Department of Energy Science and EngineeringBattery Materials & Systems LAB2. Conference Papers


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