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Effect of Electrolyte on the Stress-Strain Behavior of Polymer Binder in Commercial Rechargeable Battery Electrode

Commercial battery electrodes are composites made of active particles bonded to current collected by polymer binders. Binder not only keeps all the particles together but also provides the electrical network necessary for battery operation. Several studies showed that the mechanical behavior of the polymer binder is very important, and it governs the cyclic performance of batteries. To develop advanced degradation models of battery electrodes, the mechanical behavior of binders needs to be characterized. Recently, some studies developed experimental methods to characterize the mechanical behavior of polymer binders, which showed that the most widely used binder, polyvinylidene fluoride (PVdF), behaves as an elastic-viscoplastic material under the typical charge/discharge rates of battery electrodes. However, the time dependent behavior of PVdF is not the only characteristic behavior to keep in mind. It should be noted that the electrolyte interacts with the binder and potentially changes its mechanical behavior which has not been characterized before. Most of the existing studies were carried out under dry conditions (no electrolyte present), and no study exists on the understanding of how electrolyte solvents and salts affect the mechanical behavior of polymer binders. In this talk, we will present the effect of electrolyte on the stress-strain behavior PVdF binder.