Methods for making battery electrode systems

摘要

Methods for making battery electrode system are disclosed herein. In an example of the method, a mixture of a polymer binder, an active material and a conductive filler is deposited on a current collector. The deposited mixture is exposed to an external field having a field direction that is normal to a surface of the current collector. The exposure aligns, outward from and normal to the surface of the current collector, the active material and the conductive filler to form a plurality of discrete structures that extend outward from and normal to the surface of the current collector and are respectively aligned with a field line of the external field. Each of the plurality of discrete structures includes some of the active material and some of the conductive filler.

主权项

1. A method for making a battery electrode system, the method comprising:
depositing a mixture of a polymer binder, active material particles and conductive filler material particles on a current collector; and exposing the deposited mixture to an external field having a field direction that is normal to a surface of the current collector, thereby aligning, outward from and normal to the surface of the current collector, the active material particles and the conductive filler particles to form an electrode having an anisotropic morphology which includes a plurality of discrete, field aligned structures that extend outward from and normal to the surface of the current collector and are respectively aligned with a field line of the external field, wherein each of the plurality of discrete, field aligned structures includes: some of the active material particles; some of the polymer binder; and some of the conductive filler particles; wherein each of the active material particles and the conductive filler material particles is in an aligned position within the polymer binder, and the aligned position corresponds with the field line of the external field applied to form the field aligned structures; wherein the electrode includes from about 90% to about 99% of the active material particles and the conductive filler material particles, and less than 10% of the polymer binder.