Dry electrode film, preparation method therefor, and electrode and battery

Abstract

Disclosed are a dry electrode film, a preparation method therefor, and an electrode and a battery, which belong to the technical field of batteries. The method in the present application includes: mixing polytetrafluoroethylene, an active material, and a conductive agent, and pulverizing to obtain a pulverized mixed material; subjecting the pulverized mixed material to a primary jet milling shear to obtain a milled-sheared mixed material; wherein a condition of the primary shear includes: a gas stream temperature of −10° C.-10° C., a gas stream pressure of 0.7-0.9 MPa, and a rotational speed of 8000-12000 rpm; subjecting the milled-sheared mixed material to a secondary jet milling shear and fibrillation to obtain a fibrillized material; and subjecting the fibrillized material to a secondary fibrillation treatment to obtain the dry electrode film. The method in the present application can significantly improve the tensile strength of the electrode film, increase the liquid absorption rate of the electrode, and reduce the electrical resistivity of the electrode.

Dependencies are inferred from the claim text.