Battery and method for producing same
The present invention provides a battery that has excellent energy density and cycle characteristics early in the cycle. The battery in one aspect of the present invention comprises a positive electrode, a negative electrode that is free of a negative electrode active material, a separator that is disposed between the positive electrode and the negative electrode, and a conductive thin film that is disposed between the separator and the negative electrode. The thickness of the conductive thin film is 1 μm or less.
1 . A battery comprising:
a positive electrode;
a negative electrode that is free of a negative electrode active material;
a separator containing a porous material that is disposed between the positive electrode and the negative electrode;
a conductive thin film that is disposed between the separator and the negative electrode such that the conductive thin film contacts the separator and the conductive thin film contacts the negative electrode, wherein: the conductive thin film is formed uniformly,
the conductive thin film is composed of: carbon, metal, alloy, or a laminated film thereof, and
the metal or alloy comprises Cu, Ni, Fe, Mn, Ti, Cr, or stainless steel; and
an electrolytic solution, wherein
the thickness of the conductive thin film is 1 μm or less,
the conductive thin film is formed on the separator, and
a deposited metal layer is formed between the conductive thin film and the negative electrode during charging.
2 . The battery according to claim 1 , wherein the separator is composed of a member that does not react with metal ions.
3 . The battery according to claim 1 , wherein the separator contains porous polyethylene or polypropylene.
4 . The battery according to claim 1 , wherein the battery is a lithium secondary battery in which charging and discharging are performed by depositing lithium metal as the metal constituting the deposited metal layer on the surface of the negative electrode and dissolving the deposited lithium.
5 . A method for producing a battery, the method comprising the steps of:
forming a uniform conductive thin film of 1 μm or less on a separator containing a porous material, wherein:
the conductive thin film is composed of: carbon, metal, alloy, or a laminated film thereof, and
the metal or alloy comprises Cu, Ni, Fe, Mn, Ti, Cr, or stainless steel; and
laminating a negative electrode, the separator, and a positive electrode to form a laminate in which the conductive thin film faces the negative electrode, wherein:
the negative electrode is free of a negative electrode active material;
the conductive thin film contacts the separator; and
the conductive thin film contacts the negative electrode; and
injecting an electrolytic solution into the laminate, wherein
a deposited metal layer is formed between the conductive thin film and the negative electrode during charging.
6 . The method for producing a battery according to claim 5 , wherein the separator contains porous polyethylene or polypropylene.