Lithium ion secondary battery and method for manufacturing same
View Patent ↗A method for manufacturing a lithium ion secondary battery, the lithium ion secondary battery including a positive electrode and a negative electrode disposed with a separator sandwiched therebetween and contained together with an electrolytic solution in an outer case including a flexible film, wherein the quantity of dissolved nitrogen in the electrolytic solution in injecting the electrolytic solution into the outer case is 100 μg/mL or less.
1. A method for manufacturing a lithium ion secondary battery, the lithium ion secondary battery comprising a positive electrode and a negative electrode disposed with a separator sandwiched therebetween and contained together with an electrolytic solution in an outer case including a flexible film, wherein
a quantity of dissolved nitrogen in the electrolytic solution in injecting the electrolytic solution into the outer case is 100 μg/mL or less, the quantity being 5 μg/mL or more.
2. The method for manufacturing a lithium ion secondary battery according to claim 1 , wherein the electrolytic solution is subjected to decompression treatment before injecting the electrolytic solution into the outer case so that a quantity of dissolved nitrogen in the electrolytic solution becomes 100 μg/mL or less, and the electrolytic solution after being subjected to the decompression treatment is injected into the outer case.
3. The method for manufacturing a lithium ion secondary battery according to claim 1 , wherein a quantity of dissolved nitrogen in the electrolytic solution in injecting the electrolytic solution into the outer case is 10 μg/mL or more.
4. The method for manufacturing a lithium ion secondary battery according to claim 1 , wherein a quantity of dissolved nitrogen in the electrolytic solution in injecting the electrolytic solution into the outer case is 80 μg/mL or less.
5. The method for manufacturing a lithium ion secondary battery according to claim 1 , comprising a step of maintaining a battery obtained after injecting the electrolytic solution into the outer case, at a temperature of 35° C. or higher and 60° C. or lower for 48 hours or longer and shorter than 480 hours.
6. The method for manufacturing a lithium ion secondary battery according to claim 1 , wherein a thickness of the flexible film is 5 μm or larger and 150 μm or smaller.
7. A method for manufacturing a lithium ion secondary battery, the lithium ion secondary battery comprising a positive electrode and a negative electrode disposed with a separator sandwiched therebetween and contained together with an electrolytic solution in an outer case including a flexible film, wherein
a quantity of dissolved nitrogen in the electrolytic solution in injecting the electrolytic solution into the outer case is 100 μg/mL or less, and
the method comprises a step of maintaining a battery obtained after injecting the electrolytic solution into the outer case, at a temperature of 35° C. or higher and 60° C. or lower for 48 hours or longer and shorter than 480 hours.
8. The method for manufacturing a lithium ion secondary battery according to claim 7 , wherein the electrolytic solution is subjected to decompression treatment before injecting the electrolytic solution into the outer case so that a quantity of dissolved nitrogen in the electrolytic solution becomes 100 μg/mL or less, and the electrolytic solution after being subjected to the decompression treatment is injected into the outer case.
9. The method for manufacturing a lithium ion secondary battery according to claim 7 , wherein a quantity of dissolved nitrogen in the electrolytic solution in injecting the electrolytic solution into the outer case is 80 μg/mL or less.
10. The method for manufacturing a lithium ion secondary battery according to claim 7 , wherein a thickness of the flexible film is 5 μm or larger and 150 μm or smaller.