Anode and battery
View Patent ↗An anode capable of relaxing the stress concentration and improving the characteristics and a battery using it are provided. The anode includes an anode current collector and an anode active material layer containing silicon (Si) as an element, wherein the anode active material layer has a metal element increasing and decreasing region in which a metal element is contained as an element, and a concentration of the metal element is increased and then decreased in a thickness direction.
1. An anode comprising:
an anode current collector; and
an anode active material layer containing silicon (Si) as an element,
wherein,
the anode active material layer has a metal element increasing and decreasing region which comprises a metal element and
a concentration of the metal element is increased and then decreased in a thickness direction of the region metal element increasing and decreasing region.
2. The anode according to claim 1 , wherein:
the anode active material layer further includes a metal element constant region which comprises the metal element,
a concentration of the metal element in the metal element constant region is lower than the concentration of the metal element in the metal element increasing and decreasing region and constant in the thickness direction, and
the metal element increasing and decreasing region and the metal element constant region form a layer in the thickness direction of the anode active material layer.
3. The anode according to claim 1 , wherein the increasing and decreasing region comprises more than one kind of metal element.
4. The anode according to claim 1 wherein the metal element is selected from the group consisting of titanium (Ti), chromium (Cr), iron (Fe), cobalt (Co), nickel (Ni), and zirconium (Zr).
5. The anode according to claim 1 , wherein at least part of the anode active material layer is formed by vapor-phase deposition method.
6. The anode according to claim 1 , wherein the anode active material layer is alloyed with the anode current collector at least in part.
7. The anode according to claim 1 , wherein a surface roughness of the anode current collector is 0.1 μm or more in unit of value Ra.
8. A battery comprising:
a cathode;
an anode;
and an electrolyte,
wherein,
the anode includes an anode current collector and an anode active material layer containing silicon (Si) as an element,
the anode active material layer includes a metal element increasing and decreasing region which comprises a metal element, and
a concentration of the metal element is increased and then decreased in a thickness direction of the region metal element increasing and decreasing region.
9. The battery according to claim 8 , wherein:
the anode active material layer further includes a metal element constant region in which comprises the metal element,
a concentration of the metal element in the metal element constant region is lower than the concentration of the metal element in the metal element increasing and decreasing region, and
the metal element increasing and decreasing region and the metal element constant region form a layer in the thickness direction of the anode active material layer.
10. The battery according to claim 8 , wherein the anode active material layer increasing and decreasing region comprises more than one kind of metal element.
11. The battery according to claim 8 , wherein the metal element is at least one selected from the group consisting of titanium (Ti), chromium (Cr), iron (Fe), cobalt (Co), nickel (Ni), and zirconium (Zr).