Non-aqueous electrolyte secondary battery
A positive electrode in a lithium secondary battery includes an insulating tape that covers a welded part between a positive electrode tab and a positive electrode current collector-exposed surface. The insulating tape has a multilayer structure including an organic material layer, a composite material layer containing an organic material and an inorganic material, and an adhesive layer. The inorganic material in the composite material layer accounts for 20% or more of the weight of the composite material layer.
1. A non-aqueous electrolyte secondary battery comprising:
a positive electrode including a positive electrode current collector, a positive electrode active material layer famed on the positive electrode current collector and containing a lithium transition metal composite oxide, and a positive electrode tab welded to a positive electrode current collector-exposed surface;
a negative electrode including a negative electrode current collector and a negative electrode active material formed on the negative electrode current collector; and
a separator between the positive electrode and the negative electrode,
wherein the positive electrode includes an insulating tape that covers a welded part between the positive electrode tab and the positive electrode current collector-exposed surface,
wherein the insulating tape has a multilayer structure including an organic material layer and a composite material layer containing an organic material and an inorganic material, and
wherein the inorganic material in the composite material layer accounts for 20% or more of a weight of the composite material layer,
wherein the organic material contained in the composite material layer is formed of a resin which is adhesive at room temperature, and
wherein the organic material layer is a layer mainly composed of at least one of the group consisting of polyimide, polypropylene or polyethylene terephthalate.
2. The non-aqueous electrolyte secondary battery according to claim 1 ,
wherein the inorganic material in the composite material layer accounts for 35% or more and 80% or less of the weight of the composite material layer.
3. The non-aqueous electrolyte secondary battery according to claim 1 ,
wherein the composite material layer has a thickness of 1 μm or more and 5 μm or less.
4. The non-aqueous electrolyte secondary battery according to claim 1 , wherein a weight of the inorganic material is less than 20% of a total weight of the composite material layer and the organic material layer.
5. The non-aqueous electrolyte secondary battery according to claim 1 ,
wherein the insulating tape includes:
the organic material layer;
the composite material layer formed on the organic material layer; and
an adhesive layer formed on the composite material layer.
6. The non-aqueous electrolyte secondary battery according to claim 1 ,
wherein the insulating tape includes:
the organic material layer;
the composite material layer formed under the organic material layer; and
an adhesive layer formed on the organic material layer.
7. The non-aqueous electrolyte secondary battery according to claim 2 , wherein a weight of the inorganic material is less than 20% of a total weight of the composite material layer and the organic material layer.
8. The non-aqueous electrolyte secondary battery according to claim 1 ,
wherein the organic material contained in the composite material layer is at least one of the group consisting of a rubber-based resin and an acrylic-based resin.
9. A non-aqueous electrolyte secondary battery comprising:
a positive electrode including a positive electrode current collector, a positive electrode active material layer famed on the positive electrode current collector and containing a lithium transition metal composite oxide, and a positive electrode tab welded to a positive electrode current collector-exposed surface;
a negative electrode including a negative electrode current collector and a negative electrode active material formed on the negative electrode current collector; and
a separator between the positive electrode and the negative electrode,
wherein the positive electrode includes an insulating tape that covers a welded part between the positive electrode tab and the positive electrode current collector-exposed surface,
wherein the insulating tape has a multilayer structure including an organic material layer and a composite material layer containing an organic material and an inorganic material, and
wherein the organic material contained in the composite material layer is formed of a resin which is adhesive at room temperature,
wherein the inorganic material in the composite material layer accounts for 35% or more and 80% or less of the weight of the composite material layer, and
wherein a weight of the inorganic material is 10% or less of a total weight of the composite material layer and the organic material layer.
10. The non-aqueous electrolyte secondary battery according to claim 9 ,
wherein the organic material layer is a layer mainly composed of at least one of the group consisting of polyimide, polypropylene, or polyethylene terephthalate.
11. A non-aqueous electrolyte secondary battery comprising:
a positive electrode including a positive electrode current collector, a positive electrode active material layer formed on the positive electrode current collector and containing a lithium transition metal composite oxide, and a positive electrode tab welded to a positive electrode current collector-exposed surface;
a negative electrode including a negative electrode current collector and a negative electrode active material formed on the negative electrode current collector; and
a separator between the positive electrode and the negative electrode,
wherein the positive electrode includes an insulating tape that covers a welded part between the positive electrode tab and the positive electrode current collector-exposed surface,
wherein the insulating tape has a multilayer structure including an organic material layer and a composite material layer containing an organic material and an inorganic material, and
wherein the inorganic material in the composite material layer accounts for 20% or more of a weight of the composite material layer,
wherein the organic material contained in the composite material layer is at least one of the group consisting of a rubber-based resin and an acrylic-based resin, and
wherein the organic material layer is a layer mainly composed of at least one of the group consisting of polyimide, polypropylene and polyethylene terephthalate.
12. The non-aqueous electrolyte secondary battery according to claim 11 ,
wherein the inorganic material in the composite material layer accounts for 35% or more and 80% or less of the weight of the composite material layer.
13. The non-aqueous electrolyte secondary battery according to claim 11 ,
wherein the composite material layer has a thickness of 1 μm or more and 5 μm or less.
14. The non-aqueous electrolyte secondary battery according to claim 11 , wherein a weight of the inorganic material is less than 20% of a total weight of the composite material layer and the organic material layer.
15. The non-aqueous electrolyte secondary battery according to claim 11 ,
wherein the insulating tape includes:
the organic material layer;
the composite material layer formed on the organic material layer; and
an adhesive layer formed on the composite material layer.
16. The non-aqueous electrolyte secondary battery according to claim 11 ,
wherein the insulating tape includes:
the organic material layer;
the composite material layer formed under the organic material layer; and
an adhesive layer formed on the organic material layer.
17. A non-aqueous electrolyte secondary battery comprising:
a positive electrode including a positive electrode current collector, a positive electrode active material layer formed on the positive electrode current collector and containing a lithium transition metal composite oxide, and a positive electrode tab welded to a positive electrode current collector-exposed surface;
a negative electrode including a negative electrode current collector and a negative electrode active material formed on the negative electrode current collector; and
a separator between the positive electrode and the negative electrode,
wherein the positive electrode includes an insulating tape that covers a welded part between the positive electrode tab and the positive electrode current collector-exposed surface,
wherein the insulating tape has a multilayer structure including an organic material layer and a composite material layer containing an organic material and an inorganic material,
wherein the organic material contained in the composite material layer is at least one of the group consisting of a rubber-based resin and an acrylic-based resin,
wherein the inorganic material in the composite material layer accounts for 35% or more and 80% or less of the weight of the composite material layer, and
wherein a weight of the inorganic material is 10% or less of a total weight of the composite material layer and the organic material layer.
18. The non-aqueous electrolyte secondary battery according to claim 17 ,
wherein the organic material layer is a layer mainly composed of at least one of the group consisting of polyimide, polypropylene and polyethylene terephthalate.