Thin film battery having improved battery performance through substrate surface treatment and method for manufacturing same

A thin film battery comprising:

• a substrate;
• a cathode current collector on one side of the substrate;
• a cathode active material on the cathode current collector;
• an anode current collector on the other side of the substrate and separated from the cathode current collector;
• an electrolyte covering the cathode active material without overlapping with the anode current collector;
• a first surface treatment layer on an exposed portion of the substrate between the electrolyte and the anode current collector;
• and
• an anode active material on the anode current collector, the electrolyte, and the first surface treatment layer,
• wherein the first surface treatment layer comprises an organic material non-reactive to the anode active material.

A method of manufacturing a thin film battery, comprising:

• forming a cathode current collector on one side of a substrate;
• forming a cathode active material on the cathode current collector;
• forming an anode current collector on the other side of the substrate to be separated from the cathode current collector;
• forming an electrolyte to cover the cathode active material without overlapping with the anode current collector;
• forming a first surface treatment layer on a portion of the substrate exposed by non-overlap between the electrolyte and the anode current collector;
• and
• forming an anode active material on the anode current collector, the first surface treatment layer, and the electrolyte,
• wherein the first surface treatment layer comprises an organic material non-reactive to the anode active material.