All-solid-state lithium ion secondary battery having fluorine and carbon-containing liquid repellent film and mounted body
This solid-state lithium ion rechargeable battery includes a laminated body which includes a positive electrode layer, a negative electrode layer, and a solid electrolyte sandwiched between the positive electrode layer and the negative electrode layer, and a liquid repellent film which is provided to be in contact with the laminated body, in which the liquid repellent film contains a fluorine element and a carbon element, and has a contact angle of 30° or more when an acetic acid aqueous solution is dropped thereon.
1. A solid-state lithium ion rechargeable battery comprising:
a laminated body which includes a positive electrode layer, a negative electrode layer, and a solid electrolyte sandwiched between the positive electrode layer and the negative electrode layer; and
a liquid repellent film which is provided to be in contact with the laminated body,
wherein the liquid repellent film contains a fluorine element and a carbon element, and has a contact angle of 30° or more when an acetic acid aqueous solution having a purity of 99.7% is dropped thereon,
an existence ratio of the fluorine element with respect to the carbon element in the liquid repellent film is 1.5 times or more and 2.0 times or less, the existence ratio being detected when the liquid repellent film is measured from an outer surface side using an X-ray photoelectron spectroscopy,
the liquid repellent film is formed by deposition of perfluorocyclobutane on the laminated body,
the existence ratio of the fluorine element is 35% or more and 60% or less,
an existence ratio of an oxygen element detected when the liquid repellent film is measured from the outer surface side using the X-ray photoelectron spectroscopy is 10% or less,
existence ratios of a hydrogen element and a silicon element in the liquid repellent film are 1 mol % or less, respectively,
a thickness of the liquid repellent film is 1 μm or less,
heat resistance of the liquid repellent film is 200° C. or more, and
the positive electrode layer, the negative electrode layer, and the solid electrolyte sandwiched between the positive electrode layer and the negative electrode layer have relative density of 80% or more.
2. The solid-state lithium ion rechargeable battery according to claim 1 , wherein the heat resistance of the liquid repellent film is 250° C. or more.
3. The solid-state lithium ion rechargeable battery according to claim 1 , wherein the existence ratio of the fluorine element is 45% or more and 60% or less.
4. The solid-state lithium ion rechargeable battery according to claim 1 , wherein the existence ratio of an oxygen element detected when the liquid repellent film is measured from the outer surface side using the X-ray photoelectron spectroscopy is 5% or less.
5. The solid-state lithium ion rechargeable battery according to claim 1 , wherein the existence ratio of an oxygen element detected when the liquid repellent film is measured from the outer surface side using the X-ray photoelectron spectroscopy is 0%.
6. The solid-state lithium ion rechargeable battery according to claim 1 , wherein the existence ratios of a hydrogen element and a silicon element in the liquid repellent film are each 0.1 mol % or less.
7. The solid-state lithium ion rechargeable battery according to claim 1 , wherein the existence ratios of a hydrogen element and a silicon element in the liquid repellent film are each 0.01 mol % or less.
8. A mounted body comprising:
the solid-state lithium ion rechargeable battery according to claim 1 ;
an external terminal each connected to the positive electrode layer and the negative electrode layer of the solid-state lithium ion rechargeable battery; and
a substrate which is joined with the external terminal and the solid-state lithium ion rechargeable battery via a solder.