Battery

1. A battery comprising:

a positive electrode;

a negative electrode; and

an electrolyte that includes an electrolyte salt, a solvent, a matrix polymer, and a ceramic powder;

wherein the matrix polymer is at least one selected from the group consisting of polyvinyl formal, polyacrylic acid ester, polyvinylidene fluoride, a copolymer of polyvinyl formal, a copolymer of polyacrylic acid ester and a copolymer of polyvinylidene fluoride; and

wherein a mass ratio of the ceramic powder to the matrix polymer ranges from 2/1 to 5/1, the ceramic powder is one or both of aluminum nitride (AlN) and boron nitride (BN), and the ceramic powder is mixed in an amount of 0.5 mg/cm 2 or more and 3.6 mg/cm 2 or less per unit area of the positive electrode or the negative electrode.

2. The battery according to claim 1 , wherein the electrolyte salt is a lithium salt, and wherein the concentration of the lithium salt in the electrolyte is 0.5 mol/kg or more and 2.1 mol/kg or less.

3. The battery according to claim 1 , wherein the matrix polymer contains polyvinylidene fluoride having a weight-average molecular weight of 550,000 or more.

4. The battery according to claim 1 , wherein the electrolyte has an extension that protrudes from a positive electrode active material layer and a negative electrode active material layer in a direction that crosses a laminate direction.

5. The battery according to claim 4 , wherein the extension covers a width of 0.1 mm or more and 2 mm or less from a lateral end portion of at least one of the positive electrode active material layer and the negative electrode active material layer.

6. The battery according to claim 1 , wherein the electrolyte includes a nonionic surfactant.

7. The battery according to claim 1 , wherein the matrix polymer includes a polyvinylidene fluoridehexafluoro-propylene copolymer.

8. The battery according to claim 1 , wherein the ceramic powder has a thermal conductivity of 50 W/m° C. or more.

9. The battery according to claim 1 , wherein the ceramic powder has an average particle size of 0.1 μm or more and 2.5 μm or less.

10. An electronic device comprising the battery according to claim 1 .

11. A battery comprising:

a positive electrode;

a negative electrode; and

a gel electrolyte layer that includes an electrolyte salt, a solvent, a matrix polymer, and a ceramic powder;

wherein the matrix polymer is at least one selected from the group consisting of polyvinyl formal, polyacrylic acid ester, polyvinylidene fluoride, a copolymer of polyvinyl formal, a copolymer of polyacrylic acid ester and a copolymer of polyvinylidene fluoride; and

wherein a mass ratio of the ceramic powder to the matrix polymer ranges from 2/1 to 5/1, the ceramic powder is one or both of aluminum nitride (AlN) and boron nitride (BN), and the ceramic powder is mixed in an amount of 0.5 mg/cm 2 or more and 3.6 mg/cm 2 or less per unit area of the positive electrode or the negative electrode.

12. The battery according to claim 11 , wherein the electrolyte gel layer surrounds each of the positive electrode and the negative electrode.

13. The battery according to claim 11 , wherein the positive electrode comprises a positive electrode active material layer, the negative electrode comprises a negative electrode active material layer, and the electrolyte gel layer protrudes from lateral end portions of each of the positive electrode active material layer and the negative electrode active material layer.

14. The battery according to claim 11 , wherein the ceramic powder has a thermal conductivity of 50 W/m° C. or more.

15. The battery according to claim 11 , wherein the ceramic powder has an average particle size of 0.1 μm or more and 2.5 μm or less.

16. The battery according to claim 11 , wherein the gel electrolyte layer is provided in contact with a separator, the separator is disposed between the positive electrode and the negative electrode.

17. The battery according to claim 11 , wherein the electrolyte salt is a lithium salt, and wherein the concentration of the lithium salt in the electrolyte is 0.5 mol/kg or more and 2.1 mol/kg or less.

18. The battery according to claim 11 , wherein the matrix polymer contains polyvinylidene fluoride having a weight-average molecular weight of 550,000 or more.

19. The battery according to claim 11 , wherein the matrix polymer includes a polyvinylidene fluoridehexafluoro-propylene copolymer.

20. An electronic device comprising the battery according to claim 11 .