Stress calculation of electrode nanoparticles and adhesives for lithium-ion batteries during charge discharge cycles
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Abstract:
As an important material for lithium battery electrode manufacturing, adhesive is the main undertaker of the mechanical properties of electrode plate although its dosage is small. Most of the existing rheological models of composite electrode assume the binder layer as linear elastic material, which is difficult to describe its complex mechanical behavior. Therefore, in order to deeply understand the mechanical behavior of the electrode plate’s nanoparticles and adhesive during the charge and discharge process, a viscoelastic constitutive model was fitted based on the existing experimental data in literature. The results show that the main plastic deformation occurs during the first charge discharge cycle, and the maximum stress evolution of the bonding layer is similar to that of the nano particles. With the increase of the thickness of adhesive layer, the maximum stress at the interface of adhesive layer would decrease gradually. In addition, viscoelastic constitutive model under similar stain described the rhtological behavior of the binder PVDF better than the linear elastic model.
