Negative electrode material for lithium secondary battery and method for manufacturing the same

摘要

A negative electrode material for a lithium secondary battery, having one of iron foil and iron-base alloy foil, wherein the one of iron foil and iron-base alloy foil which has a surface profile having a plurality of concave shaped hollows formed by heat treating with laser beam irradiation and the surface is a surface which contacts with an electrolyte solution for a lithium secondary battery. There is further provided a lithium secondary battery including a negative electrode of the negative electrode material, a positive electrode using a lithium compound as an active material, an electrolyte between the negative electrode and the positive electrode, and a separator dividing the negative electrode and the positive electrode from each other.

主权项

1. A lithium secondary battery, comprising:
a negative electrode; a positive electrode using a lithium compound as an active material; an electrolyte between the negative electrode and the positive electrode; and a separator dividing the negative electrode and positive electrode from each other, and the lithium secondary battery does not use a negative electrode wherein a negative electrode active material layer is applied on a surface of a negative electrode collector, the negative electrode material comprising one of iron foil and iron-base alloy foil, wherein the one of the iron foil and the iron-base alloy foil has a thickness of 5 μm to 20 μm, and has a surface profile having a plurality of concave shaped hollows formed by heat treating with laser beam irradiation, melting and transforming the surface, and a depth from a plane surface of the concave shaped hollow at an edge of the hollow to a lowermost part of the hollow is 0.5 μm to 2.5 μm, the surface is a surface of the negative electrode which contacts with the electrolyte solution.