Electrode material and manufacturing method thereof
AssigneeKobe Steel, Ltd.
InventorsMamoru Hosokawa, Satoru Takada, Sho Katsura, Jun Suzuki, Toshiki Sato
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Abstract
Provided is an electrode material with excellent tab weldability and realizing decreased contact resistance with an active material layer. A collector (electrode material) (1) is provided with a metal foil substrate (1a) and a carbon-containing conductive substance (1b), and is configured such that, when observed from a square viewfield with a surface area of 0.1 mm2, the conductive substance (1b) is arranged in islands on the surface of the substrate (1a) with a 1-80% coverage ratio of the conductive substance (1b) on the surface of the substrate (1a).
Claims9
A manufacturing method of an electrode material comprising a substrate and a conductive substance, the method comprising:
- applying a solution comprising the conductive substance which comprises carbon onto a surface of the substrate formed of a metal foil, and
- subsequently drying the solution,
- wherein
- the solution comprises from 0.1 to 7 mass % of carbon powder having an average particle size of from 0.01 to 1 μm,
- the conductive substance is aggregated in the solution before or after applying the solution onto the surface of the substrate,
- a deposition amount per unit area of the conductive substance on the substrate is from 0.05 to 0.50 g/m2, and
- when the conductive substance is observed in a square visual field having an area of 0.1 mm2, the conductive substance is disposed in islands at a coverage ratio of from 1 to 80% on the surface of the substrate.
Dependencies are inferred from the claim text.