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US 2012/0231331 A1Published application
Electrode including current collector with nano-scale coating and method of making the same
Assignee3M Innovative Properties Company
InventorsRanjith DIVIGALPITIYA, Mary I. BUCKETT
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Abstract
Current collectors and methods are provided that relate to electrodes that are useful in lithium polymer electrochemical cells. The provided current collectors include a metallic substrate, a substantially uniform nano-scale carbon coating, and an active electrode material. The coating has a maximum thickness of less than about 200 nanometers.
Claims16
An electrode for a lithium polymer electrochemical cell comprising:
- a current collector comprising:
- a metallic substrate;
- a substantially uniform nano-scale carbon coating;
- and
- an active electrode material,
- wherein the coating has a maximum thickness of less than about 200 nanometers.
3 more elements
A method of making a current collector comprising:
- providing a metallic substrate;
- and
- applying to the substrate without a solvent present, a dry composition including carbon particles;
- and
- buffing an effective amount of said particles on said substrate at a pressure normal to the surface of greater than 0 and less than about 30 g/cm2 using an applicator pad, said applicator pad moving in a plane parallel to said surface in a plurality of directions relative to a point on the surface such that a substantially uniform coating of said particles is provided,
- wherein said particles have a Mohs' hardness between 0.4 and 3 and a largest dimension of less than about 100 microns,
- wherein the substantially uniform coating has a maximum average thickness of less than about 100 nanometers with a variation in thickness of no more than 10%, and wherein the metallic substrate is selected from aluminum, copper, magnesium, nickel, tin, and alloys thereof.
4 more elements
Dependencies are inferred from the claim text.