Battery, separator, battery pack, electronic device, electromotive vehicle, power storage apparatus, and electric power system

1. A battery comprising:

a positive electrode;

a negative electrode;

an electrolytic solution holding layer between the positive electrode and the negative electrode,

wherein the electrolytic solution holding layer comprises inorganic particles and a vinylidene fluoride polymer,

wherein a mass ratio of the vinylidene fluoride polymer and the inorganic particles is 1:6 to 1:8, and the average molecular weight of the vinylidene fluoride polymer is between 500,000 and 1.5 million, and

wherein the electrolytic solution holding layer has an air permeability after heat pressing of 256-298 sec/100 cc and at least one of a degree of swelling of 102%-123% or a separation strength between the negative electrode and the separator of 10-13 N/m.

2. The battery according to claim 1 , wherein the battery comprises a separator including a base material layer, and the electrolytic solution holding layer is provided on at least one surface of the base material layer.

3. The battery according to claim 1 , wherein an average molecular weight of the vinylidene fluoride polymer is 750,000 or more to 1.2 million or less.

4. The battery according to claim 1 , wherein the vinylidene fluoride polymer includes a vinylidene fluoride homopolymer or a vinylidene fluoride copolymer including a vinylidene fluoride monomer unit and a hexafluoropropylene monomer unit.

5. The battery according to claim 4 , wherein a mass composition ratio of the vinylidene fluoride monomer unit: the hexafluoropropylene monomer unit is 100:0 to 95:5.

6. The battery according to claim 1 comprising an exterior body comprising laminated films.

7. An electromotive vehicle comprising:

the battery according to claim 1 ;

a converting apparatus configured to receive a supply of electric power from the battery and convert the electric power to a driving force of the electromotive vehicle.

8. A power storage apparatus comprising the battery according to claim 1 , wherein electric power is supplied to an electronic device connected to the battery.

9. An electric power system, wherein electric power is supplied from the battery according to claim 1 or electric power is supplied to the battery from a power generating apparatus or an electric power network.

10. The battery according to claim 1 , wherein the inorganic particles comprise a material selected from the group consisting of metallic oxide, metallic nitride, metallic carbide, and combinations thereof.

11. The battery according to claim 1 , wherein the inorganic particles comprise metallic oxide selected from the group consisting of alumina, magnesia, titania, zirconia, silica, and combinations thereof.

12. The battery according to claim 1 , wherein the inorganic particles comprise metallic nitride selected from the group consisting of silicon nitride, aluminum nitride, boron nitride, titanium nitride, and combinations thereof.

13. The battery according to claim 1 , wherein the inorganic particles comprise metallic carbide selected from the group consisting of silicon carbide, boron carbide, and combinations thereof.

14. The battery according to claim 1 , wherein an area density of the electrolytic solution holding layer is 0.1 mg/cm′ or more and 10 mg/cm′ or less.

15. The battery according to claim 14 , wherein an area density of the electrolytic solution holding layer is 0.41 mg/cm′ or more and 0.45 mg/cm′ or less.

16. The battery according to claim 1 , wherein a thickness of the electrolytic solution holding layer is 3.0 μm or less.

17. The battery according to claim 1 , wherein a duration until leaked electric current is observed with float charging at 60° C. and 4.25 V is 320 hour or more and 340 hour or less.

18. The battery according to claim 5 , wherein a mass composition ratio of the vinylidene fluoride monomer unit: the hexafluoropropylene monomer unit is 97.3 to 95:5.