Lithium-ion secondary battery

1. A lithium-ion secondary battery comprising:

a positive electrode that includes a positive electrode active material;

a negative electrode; and

an electrolytic solution that includes a cyclic sulfuric acid ester compound represented by Formula (1), a cyclic ether compound represented by Formula (2), and a chain alkyl dinitrile compound represented by Formula (3),

wherein a ratio of a weight in milligrams of the cyclic sulfuric acid ester compound to a weight in grams of the positive electrode active material is from 0.01 to 2,

wherein

each of R1 to R6 represents one of a hydrogen group and a monovalent hydrocarbon group, and

n1 is an integer of 0 or greater,

wherein

each of R7 to R12 represents one of a hydrogen group and a monovalent hydrocarbon group, and

each of n2 and n3 is an integer of 1 or greater, and

wherein

each of R13 to R16 represents one of a hydrogen group and a monovalent hydrocarbon group, and

n4 is an integer of 0 or greater.

2. The lithium-ion secondary battery according to claim 1 , wherein a ratio of a weight in milligrams of the cyclic ether compound to the weight in milligrams of the cyclic sulfuric acid ester compound is from 0.2 to 5.

3. The lithium-ion secondary battery according to claim 1 , wherein a content of the chain alkyl dinitrile compound in the electrolytic solution is from 0.1 weight percent to 5 weight percent.

4. The lithium-ion secondary battery according to claim 2 , wherein a content of the chain alkyl dinitrile compound in the electrolytic solution is from 0.1 weight percent to 5 weight percent.

5. The lithium-ion secondary battery according to claim 1 , wherein

n1 in Formula (1) is 2 or less,

each of n2 and n3 in Formula (2) is 2 or less, and

n4 in Formula (3) is 7 or less.

6. The lithium-ion secondary battery according to claim 2 , wherein

n1 in Formula (1) is 2 or less,

each of n2 and n3 in Formula (2) is 2 or less, and

n4 in Formula (3) is 7 or less.

7. The lithium-ion secondary battery according to claim 3 , wherein

n1 in Formula (1) is 2 or less,

each of n2 and n3 in Formula (2) is 2 or less, and

n4 in Formula (3) is 7 or less.

8. The lithium-ion secondary battery according to claim 1 , wherein the positive electrode active material includes

a center part that includes a lithium composite oxide, and

a covering part that covers at least a portion of a surface of the center part and that includes a compound having a composition different from the lithium composite oxide.

9. The lithium-ion secondary battery according to claim 2 , wherein the positive electrode active material includes

a center part that includes a lithium composite oxide, and

a covering part that covers at least a portion of a surface of the center part and that includes a compound having a composition different from the lithium composite oxide.

10. The lithium-ion secondary battery according to claim 3 , wherein the positive electrode active material includes

a center part that includes a lithium composite oxide, and

a covering part that covers at least a portion of a surface of the center part and that includes a compound having a composition different from the lithium composite oxide.

11. The lithium-ion secondary battery according to claim 5 , wherein the positive electrode active material includes

a center part that includes a lithium composite oxide, and

a covering part that covers at least a portion of a surface of the center part and that includes a compound having a composition different from the lithium composite oxide.

12. The lithium-ion secondary battery according to claim 8 , wherein the compound having the composition different from the lithium composite oxide includes at least one of (1) another lithium composite oxide having a composition that is different from the lithium composite oxide; a lithium phosphoric acid compound; a metallic phosphoric acid salt; a halide; or a chalcogenide other than an oxide.