Nonaqueous electrolyte secondary battery insulating porous layer and nonaqueous electrolyte secondary battery laminated separator
As a nonaqueous electrolyte secondary battery insulating porous layer and nonaqueous electrolyte secondary battery laminated separator each of which allows a nonaqueous electrolyte secondary battery to have an improved discharge output characteristic, there are provided (i) a nonaqueous electrolyte secondary battery insulating porous layer containing a filler including a metal oxide and having a capacitance of not less than 0.0390 nF and not more than 0.142 nF per 19.6 mm 2 and a thickness of not less than 0.1 μm and not more than 20 μm and (ii) a nonaqueous electrolyte secondary battery laminated separator including the porous layer.
1. An insulating porous layer for a nonaqueous electrolyte secondary battery, the insulating porous layer comprising:
a fine metal oxide particle made of a titanium oxide and alumina,
the insulating porous layer having a capacitance of not less than 0.0390 nF and not more than 0.142 nF per 19.6 mm 2 and a thickness of not less than 0.1 μm and not more than 20 μm,
the insulating porous layer comprising pores having a pore size of not more than 3 μm.
2. The insulating porous layer according to claim 1 ,
wherein
the fine metal oxide particle contains a metal oxide in a form of a solid solution.
3. The insulating porous layer according to claim 1 ,
wherein
the fine metal oxide particle is a ground product.
4. The insulating porous layer according to claim 1 ,
wherein
the fine metal oxide particle contains two or more kinds of metal oxides.
5. A laminated separator for a nonaqueous electrolyte secondary battery, the laminated separator comprising:
a porous film containing a polyolefin at a proportion of not less than 50% by volume; and
an insulating porous layer containing a fine metal oxide particle made of a titanium oxide and alumina and disposed on one or both surfaces of the porous film,
the insulating porous layer having a thickness of not less than 0.1 μm and not more than 20 μm,
the porous film having a thickness of not less than 4 μm and not more than 50 μm,
the laminated separator having a capacitance of not less than 0.0145 nF and not more than 0.0230 nF per 19.6 mm 2 ,
the insulating porous layer comprising pores having a pore size of not more than 3 μm.
6. The laminated separator according to claim 5 ,
wherein
the laminated separator has a relative dielectric constant of more than 1.70 and not more than 2.60.
7. The laminated separator according to claim 5 ,
wherein
the porous film has a capacitance of not less than 0.0230 nF and not more than 0.0270 nF per 19.6 mm 2.
8. The laminated separator according to claim 5 ,
wherein
the fine metal oxide particle contains a metal oxide in a form of a solid solution.
9. The laminated separator according to claim 5 ,
wherein
the fine metal oxide particle is a ground product.
10. The laminated separator according to claim 5 ,
wherein
the fine metal oxide particle contains two or more kinds of metal oxides.
11. A nonaqueous electrolyte secondary battery member, comprising:
a cathode;
an insulating porous layer according to claim 1 ; and
an anode,
the cathode, the insulating porous layer, and the anode being arranged in that order.
12. A nonaqueous electrolyte secondary battery member, comprising:
a cathode;
a laminated separator according to claim 5 ; and
an anode,
the cathode, the laminated separator, and the anode being arranged in that order.
13. A nonaqueous electrolyte secondary battery, comprising:
a laminated separator according to claim 5 ; and
an electrolyte solution solvent,
the laminated separator having a relative dielectric constant having a proportion of not less than 0.0190 and not more than 0.930 with respect to a relative dielectric constant of the electrolyte solution solvent.
14. A nonaqueous electrolyte secondary battery, comprising:
an insulating porous layer according to claim 1 .
15. A nonaqueous electrolyte secondary battery, comprising:
a laminated separator according to claim 5 .