To provide a negative electrode current collector for lithium ion battery, which hardly causes cycle deterioration and has high strength, compared with a copper foil, and is excellent in productivity, to provide a clad material suitably used as a material thereof, and to provide a method for manufacturing the same.
The clad material includes copper layers 3 and 4 bonded to both sides of a nickel base metal layer 2 formed of a nickel base metal. The nickel base metal is composed of a nickel base alloy including 90 mass% or more of pure Ni or Ni, and the ratio tn/tc of the thickness tn of the nickel base metal layer 2 to the overall thickness tc of the clad material is 0.5 or more. The tn/tc is preferably 0.8 or less, and t1/t2 is preferably set to 0.9-1 where the thickness of one of the copper layers is t1, the thickness of the other copper layer is t2, and t2≥t1.
COPYRIGHT: (C)2011,JPO&INPIT
Masaaki Ishio
Ryoji Inoue
| JP2009004363A | ||||
| JP6070159U | ||||
| JP11238528A |