Electrode for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and method for manufacturing the same
View Patent ↗The present invention relates to an electrode for a non-aqueous electrolyte secondary battery, a non-aqueous electrolyte secondary battery using the electrode, and a method for manufacturing the non-aqueous electrolyte secondary battery. The electrode for a non-aqueous electrolyte secondary battery includes a material mixture layer containing an active material and a porous insulating layer. The insulating layer is formed on the material mixture layer. The insulating layer contains a resin having a cross-linked structure and inorganic particles. A mixed layer that includes components of the insulating layer and components of the material mixture layer is provided at the interface between the insulating layer and the material mixture layer.
1. An electrode for a non-aqueous electrolyte secondary battery comprising:
a material mixture layer containing an active material; and
a porous insulating layer,
wherein the insulating layer is formed on the material mixture layer,
the insulating layer contains a resin having a cross-linked structure and inorganic particles,
a mixed layer that includes components of the insulating layer and components of the material mixture layer is provided at an interface between the insulating layer and the material mixture layer, and
the mixed layer has a thickness of 3 to 15 μm.
2. The electrode for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the insulating layer has a surface roughness Ra of 0.2 to 0.4 μm.
3. The electrode for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the insulating layer has a thickness of 3 to 50 μm.
4. The electrode for a non-aqueous electrolyte secondary battery according to claim 1 , wherein in the insulating layer, a content of the resin having the cross-linked structure is 35 to 75 vol %, and a content of the inorganic particles is 25 to 65 vol %.
5. The electrode for a non-aqueous electrolyte secondary battery according to claim 1 , wherein an insulating resin layer is further provided on at least a part of an end portion of the electrode.
6. The electrode for a non-aqueous electrolyte secondary battery according to claim 5 , wherein the insulating resin layer is disposed at a position corresponding to a current collector tab of a counter electrode or a self-electrode.
7. The electrode for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the insulating layer further contains a thermoplastic resin having a melting point of 100 to 170° C.
8. The electrode for a non-aqueous electrolyte secondary battery according to claim 1 , further comprising a porous thermoplastic resin layer that contains a thermoplastic resin having a melting point of 100 to 170° C.
9. The electrode for a non-aqueous electrolyte secondary battery according to claim 8 , wherein the thermoplastic resin layer has a thickness of 1 to 15 μm.
10. A non-aqueous electrolyte secondary battery comprising:
a positive electrode that includes a material mixture layer containing a positive electrode active material;
a negative electrode that includes a material mixture layer containing a negative electrode active material; and
a non-aqueous electrolyte,
wherein at least one electrode selected from the positive electrode and the negative electrode includes a porous insulating layer,
the insulating layer is formed on the material mixture layer,
the insulating layer contains a resin having a cross-linked structure and inorganic particles,
a mixed layer that includes components of the insulating layer and components of the material mixture layer is provided at an interface between the insulating layer and the material mixture layer, and
the mixed layer has a thickness of 3 to 15 μm.
11. The non-aqueous electrolyte secondary battery according to claim 10 , wherein the insulating layer has a surface roughness Ra of 0.2 to 0.4 μm.
12. The non-aqueous electrolyte secondary battery according to claim 10 , wherein the insulating layer has a thickness of 3 to 50 μm.
13. The non-aqueous electrolyte secondary battery according to claim 10 , wherein in the insulating layer, a content of the resin having the cross-linked structure is 35 to 75 vol %, and a content of the inorganic particles is 25 to 65 vol %.
14. The non-aqueous electrolyte secondary battery according to claim 10 , wherein an insulating resin layer is further provided on at least a part of an end portion of the electrode.
15. The non-aqueous electrolyte secondary battery according to claim 14 , wherein the insulating resin layer is disposed at a position corresponding to a current collector tab of a counter electrode or a self-electrode.
16. The non-aqueous electrolyte secondary battery according to claim 10 , wherein the insulating layer further contains a thermoplastic resin having a melting point of 100 to 170° C.
17. The non-aqueous electrolyte secondary battery according to claim 10 , wherein a porous thermoplastic resin layer that contains a thermoplastic resin having a melting point of 100 to 170° C. is further provided on a surface of the electrode.
18. The non-aqueous electrolyte secondary battery according to claim 17 , wherein the thermoplastic resin layer has a thickness of 1 to 15 μm.
19. The non-aqueous electrolyte secondary battery according to claim 10 , wherein the insulating layer is formed on the material mixture layer of the negative electrode.
20. The non-aqueous electrolyte secondary battery according to claim 10 , wherein the negative electrode includes as the negative electrode active material a graphite carbon material and a material containing silicon as a constituent element.
21. The non-aqueous electrolyte secondary battery according to claim 10 , wherein a polyurethane microporous film or a polyethylene terephthalate nonwoven fabric is further provided between the positive electrode and the negative electrode.