Nonaqueous electrolyte secondary battery
A nonaqueous electrolyte secondary battery ( 10 ) includes a porous film ( 78 ) (heat resistance layer (HRL)) in, which particles (filler F) of an insulating ceramic are attached through a binder onto a surface of at least one of a negative electrode active material layer ( 63 ) and a separator ( 72, 74 ). In the nonaqueous electrolyte secondary battery, the insulating ceramic of the porous film ( 78 ) contains at least one of Fe and Ni.
1. A nonaqueous electrolyte secondary battery comprising:
a battery case;
a wound electrode body that is stored in the battery case; and
an electrolytic solution that is stored in the battery case,
wherein the wound electrode body includes
a positive electrode current collector foil,
a positive electrode active material layer that contains positive electrode active material particles and is held by the positive electrode current collector foil,
a negative electrode current collector foil,
a negative electrode active material layer that contains negative electrode active material particles and is held by the negative electrode current collector foil,
a separator formed of a porous polyolefin resin and interposed between the positive electrode active material layer and the negative electrode active material layer, and
a porous film in which particles of an insulating ceramic are attached through a binder onto a surface of at least one of the negative electrode active material layer and the separator, and
the electrolytic solution contains LiBOB,
the insulating ceramic contains Fe in a weight ratio of 20 ppm to 6,000 ppm and Ni,
the insulating ceramic contains Fe in a weight ratio more than Ni,
the insulating ceramic is at least one of α-alumina or boehmite, and
wherein the nonaqueous electrolyte secondary battery is a lithium ion secondary battery.
2. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the insulating ceramic further contains Ni in a weight ratio of 20 ppm to 6,000 ppm.
3. The nonaqueous electrolyte secondary battery according to claim 1 , wherein a median size D50 of the insulating ceramic is 0.2 μm to 2.0 μm.
4. The nonaqueous electrolyte secondary battery according to claim 1 , wherein a thickness of the porous film is 3 μm to 10 μm.
5. The nonaqueous electrolyte secondary battery according to claim 1 , wherein a coating film derived from LiBOB is formed on a surface of the positive electrode active material layer or the negative electrode active material layer.
6. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the electrolytic solution contains LiBOB in an amount of 0.01 mol/L to 0.07 mol/L.
7. A nonaqueous electrolyte secondary battery comprising:
a battery case;
a wound electrode body that is stored in the battery case; and
an electrolytic solution that is stored in the battery case,
wherein the wound electrode body includes
a positive electrode current collector foil,
a positive electrode active material layer that contains positive electrode active material particles and is held by the positive electrode current collector foil,
a negative electrode current collector foil,
a negative electrode active material layer that contains negative electrode active material particles and is held by the negative electrode current collector foil,
a separator formed of a porous polyolefin resin and interposed between the positive electrode active material layer and the negative electrode active material layer, and
a porous film in which particles of an insulating ceramic are attached through a binder onto a surface of at least one of the negative electrode active material layer and the separator, and
the electrolytic solution contains LiBOB,
the insulating ceramic contains Ni in a weight ratio of 20 ppm to 6,000 ppm and Fe,
the insulating ceramic contains Fe in a weight ratio more than Ni,
the insulating ceramic is at least one of α-alumina or boehmite, and
wherein the nonaqueous electrolyte secondary battery is a lithium ion secondary battery.
8. The nonaqueous electrolyte secondary battery according to claim 7 , wherein a median size D50 of the insulating ceramic is 0.2 μm to 2.0 μm.
9. The nonaqueous electrolyte secondary battery according to claim 7 , wherein a thickness of the porous film is 3 μm to 10 μm.
10. The nonaqueous electrolyte secondary battery according to claim 7 , wherein a coating film derived from LiBOB is formed on a surface of the positive electrode active material layer or the negative electrode active material layer.
11. The nonaqueous electrolyte secondary battery according to claim 7 , wherein the electrolytic solution contains LiBOB in an amount of 0.01 mol/L to 0.07 mol/L.