Study on mechanical properties of anode material for lithium-ion battery with different binder materials

抄録

The basic mechanical properties of different binder materials in the anode material of lithium-ion batteries were investigated based on the microstructure of the electrode material. Anode materials consisting of carbon powder, and polyvinylidene fluoride (PVDF) or styrene-butadiene rubber (SBR) binders were subjected to tensile tests and a single cycle fatigue test, loading and unloading tests. Stress-strain curve, tensile strength, permanent strain, and the dissipated strain energy were measured in these tests and estimated using a simple model proposed in a previous study. The proposed model approximates the arrangement of carbon particles as body-centered cubic (bcc) or face-centered cubic (fcc). External loads on the model were supported by the binders placed between the carbon particles. Test results showed that the mechanical properties of the SBR binder, as well as the PVDF binder, affect the macroscopic mechanical properties of the anode material. Tensile strengths were approximately between the upper and lower limits of the proposed model. Stress-strain diagrams, permanent strain, and the dissipated strain energy were in good agreement using the bcc<110> model, one of the proposed models.