Method for manufacturing flexible battery, and flexible battery manufactured thereby
View Patent ↗A method for manufacturing a flexible battery includes the steps of: preparing an electrode current collector having a current collecting portion provided with at least one through-hole; carrying out electrospinning of electrode slurry including an electrode active material, a binder, a conductive material and a solvent on at least one surface of an edge of the current collecting portion and over the through-hole to form an electrode active material layer on at least one surface of the electrode current collector; and forming a battery provided with the electrode current collector having the electrode active material layer formed thereon as an electrode. A flexible battery obtained from the method is also provided.
1. A method for manufacturing a flexible battery, comprising the steps of:
preparing an electrode current collector having a current collecting portion provided with at least one through-hole;
carrying out electrospinning of electrode slurry comprising an electrode active material, a binder, a conductive material and a solvent on at least one surface of an edge of the current collecting portion and over the through-hole while preventing the electrode slurry from passing through the through-hole to form an electrode active material layer on at least one surface of the electrode current collector; and
forming a battery provided with the electrode current collector having the electrode active material layer formed thereon as an electrode.
2. The method for manufacturing a flexible battery according to claim 1 , wherein the current collecting portion except the through-hole has an area of 4-85% of the total area of the current collecting portion.
3. The method for manufacturing a flexible battery according to claim 1 , wherein the current collecting portion has a ring-like, mesh-like or grid-like shape.
4. The method for manufacturing a flexible battery according to claim 1 , wherein the electrode current collector is made of any one material selected from stainless steel, aluminum, nickel, titanium, baked carbon, copper; stainless steel surface-treated with carbon, nickel, titanium, silver, gold or platinum; aluminum-cadmium alloys; non-conductive polymers surface-treated with a conductive material; non-conductive polymers surface-treated with a metal; and conductive polymers.
5. The method for manufacturing a flexible battery according to claim 1 , wherein the step of forming an electrode active material layer comprises carrying out masking at a tab connecting portion of the electrode current collector by using a mask, before the electrospinning step, forming an electrode active material layer through electrospinning, and then removing the mask from the tab connecting portion of the electrode current collector.
6. The method for manufacturing a flexible battery according to claim 1 , wherein the electrode is at least one of a positive electrode and a negative electrode.
7. The method for manufacturing a flexible battery according to claim 1 , wherein the step of forming a battery comprises forming an electrode assembly including the electrode and a separator, and introducing the electrode assembly into a battery casing.
8. The method for manufacturing a flexible battery according to claim 1 , wherein a tab connecting portion extended from the edge of the current collecting portion and connected to a tab is provided with one or more through-holes.
9. The method for manufacturing a flexible battery according to claim 1 , wherein the at least one through-hole is a single through-hole and the current collecting portion has a ring-like shape, and the current collecting portion except the single through-hole has an area of 4-20% of the total area of the current collecting portion.