Abstract: Three different cathode slurries for lithium ion batteries with various PVDF binder contents were prepared and their rheological properties were tested and compared.Results showed that the shear viscosity of the cathode slurry increased and the flowability decreased with higher PVDF binder amount in the slurries.The thixotropic test showed that when appropriate amount of PVDF was added in the slurries，the particles can form a uniform and stable dispersion structure.Too more or too less PVDF amount will lead to the agglomeration of particles.

Key words: lithium ion battery, cathode slurry, PVDF, rheological property