Battery

1. A battery comprising:

a positive electrode;

a negative electrode;

a separator between the positive and negative electrodes, the separator comprising greater than 0% and not more than 10% by mass of polypropylene;

a polymeric layer between the separator and one or both of the positive electrode and the negative electrode, the polymeric layer including an electrolytic solution comprising 13% by mass to 25% by mass of an electrolyte salt; and

an exterior member housing the positive electrode, the negative electrode, the separator, and the polymeric layer,

wherein the battery has a maximum attained temperature not higher than 100° C. based on a nail piercing safety test.

2. The battery according to claim 1 , wherein the electrolytic solution ranges from 0.14 g per cm 3 to 0.35 g per cm 3 of a volume of the battery.

3. The battery according to claim 1 , wherein the polymeric layer is adapted to contact or adhere to the separator and one or both of the positive electrode and the negative electrode.

4. The battery according to claim 1 , wherein the polymeric layer comprises vinylidene fluoride.

5. The battery according to claim 1 , wherein the electrolytic solution comprises a cyclic carbonic ester derivative.

6. The battery according to claim 5 , wherein the cyclic carbonic ester derivative comprises one or both of 4-fluoro-1,3-dioxolan-2-one and 4-chloro-1,3-dioxolan-2-one.

7. The battery according to claim 5 , wherein the cyclic carbonic ester derivative comprises a halogen atom-containing cyclic carbonic ester derivative.

8. The battery according to claim 5 , wherein a content of the cyclic carbonic ester derivative is from 0.5% by mass to 2% by mass.

9. The battery according to claim 1 , wherein the exterior member comprises aluminum and a resin.

10. The battery according to claim 1 , wherein the separator includes a single film.

11. The battery according to claim 1 , wherein one of the positive electrode or the negative electrode is provided on the separator, and a peeling strength between the separator and an exposed portion of the positive electrode or the negative electrode is 5 mN/mm or more.

12. The battery according to claim 1 , wherein the electrolytic solution contains from 20% by mass to 50% by mass of a cyclic carbonate and from 50% by mass to 80% by mass of a solvent selected from the group consisting of diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, methyl propyl carbonate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, methyl butyrate, methyl isobutyrate, methyl trimethylacetate, ethyl trimethylacetate, N,N-dimethylacetamide, methyl N,Ndiethylcarbamate, ethyl N,N-diethylcarbamate, 1,2-dimethoxyethane, tetrahydrofuran, tetrahydropyran, and 1,3-dioxolane.

13. The battery according to claim 1 , wherein a ratio (MO/MA) of a first amount of the electrolytic solution (MO) existing between the exterior member and a battery element selected from the group consisting of the positive electrode, the negative electrode, the separator, and the polymeric layer, to a second amount of the electrolytic solution (MA) existing inside the exterior member, is not more than 0.04.

14. The battery according to claim 1 , wherein the separator has a thickness of 5 μm to 20 μm.

15. The battery according to claim 1 , wherein the separator comprises polypropylene and polyethylene.

16. The battery according to claim 1 , wherein the negative electrode comprises at least one element selected from the group consisting of tin, lead, aluminum, indium, silicon, zinc, antimony, bismuth, gallium, germanium, arsenic, silver, hafnium, zirconium, and yttrium.

17. The battery according to claim 1 , wherein the negative electrode comprises a an alloy of tin comprising at least one element selected from the group consisting of silicon, magnesium, nickel, copper, iron, cobalt, manganese, zinc, indium, silver, titanium, germanium, bismuth, antimony and chromium.

18. The battery according to claim 1 , wherein the negative electrode comprises an alloy of silicon comprising at least one element selected from the group consisting of tin, magnesium, nickel, copper, iron, cobalt, manganese, zinc, indium, silver, titanium, germanium, bismuth, antimony and chromium.

19. The battery according to claim 1 , wherein the negative electrode comprises a compound of tin or silicon, and wherein the compound comprises one or both of oxygen and carbon.

20. The battery according to claim 1 , wherein the separator comprises less than 5% by mass of polypropylene.