Electrolytic solution, secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus

1. A secondary battery comprising:

a cathode;

an anode; and

an electrolytic solution including a cyano compound, the cyano compound including a compound represented by a following Formula (1),

where R3 is one of a saturated hydrocarbon group, an unsaturated hydrocarbon group, an oxygen-containing saturated hydrocarbon group, halogenated groups of the foregoing groups, and groups each obtained by bonding two or more of the foregoing groups to one another; R4 is one of a cyano-group-containing group, halogenated groups thereof, and groups each obtained by bonding two or more of the foregoing groups to one another; a cyano group in the cyano-group-containing group is bonded to an oxygen atom at a terminal of a —C(═O)—O— bond with one or more carbon atoms in between; (D) when the R3 includes an unsaturated carbon bond, number of the cyano group in the R4 is one or larger; (E) when the R3 does not include the unsaturated carbon bond and the R4 includes the unsaturated carbon bond, the number of the cyano group in the R4 is one or larger; and (F) when the R3 does not include the unsaturated carbon bond and the R4 does not include the unsaturated carbon bond, the number of the cyano group in the R4 is two or larger,

wherein the compound represented by the Formula (1) is one or more of compounds represented by following Formula (1-1) to Formula (1-2).

2. The secondary battery according to claim 1 , wherein the cyano-group-containing group is one of a group obtained by substituting each of part or all of hydrogen groups in a saturated hydrocarbon group by a cyano group and a group obtained by substituting each of part or all of hydrogen groups in an unsaturated hydrocarbon group by a cyano group.

3. The secondary battery according to claim 2 , wherein

the saturated hydrocarbon group is an alkyl group with carbon number from 1 to 12 both inclusive, and

the unsaturated hydrocarbon group is an aryl group with carbon number from 6 to 18 both inclusive.

4. The secondary battery according to claim 1 , wherein

the saturated hydrocarbon group is one of an alkyl group with carbon number from 1 to 12 both inclusive and a cycloalkyl group with carbon number from 3 to 18 both inclusive,

the unsaturated hydrocarbon group is one of an alkenyl group with carbon number from 2 to 12 both inclusive, an alkynyl group with carbon number from 2 to 12 both inclusive, and an aryl group with carbon number from 6 to 18 both inclusive,

the oxygen-containing saturated hydrocarbon group is an alkoxy group with carbon number from 1 to 12 both inclusive, and

the halogenated groups each include, as a halogen group, one or more of a fluorine group, a chlorine group, a bromine group, and an iodine group.

5. The secondary battery according to claim 1 , wherein a content of the cyano compound in the electrolytic solution is from about 0.01 weight percent to about 20 weight percent both inclusive.

6. The secondary battery according to claim 1 , wherein

the electrolytic solution includes a non-cyano compound, and

the non-cyano compound includes a compound represented by a following Formula (2),

where R11 and R13 are each one of a monovalent hydrocarbon group, a monovalent oxygen-containing hydrocarbon group, halogenated groups of the foregoing groups, and groups each obtained by bonding two or more of the foregoing groups to one another; and R12 is one of a divalent hydrocarbon group and halogenated groups thereof.

7. The secondary battery according to claim 6 , wherein

the monovalent hydrocarbon group and the monovalent oxygen-containing hydrocarbon group encompass an alkyl group with carbon number from 1 to 12 both inclusive, an alkenyl group with carbon number from 2 to 12 both inclusive, an alkynyl group with carbon number from 2 to 12 both inclusive, an aryl group with carbon number from 6 to 18 both inclusive, a cycloalkyl group with carbon number from 3 to 18 both inclusive, and an alkoxy group with carbon number from 1 to 12 both inclusive,

the divalent hydrocarbon group is one of an alkylene group with carbon number from 1 to 12 both inclusive, an alkenylene group with carbon number from 2 to 12 both inclusive, an alkynylene group with carbon number from 2 to 12 both inclusive, an arylene group with carbon number from 6 to 18 both inclusive, a cycloalkylene group with carbon number from 3 to 18 both inclusive, groups each obtained by bonding two or more of the foregoing groups to one another, and groups each including one or more of the foregoing groups and an ether bond (—O—), and

the halogenated group includes, as a halogen group, one or more of a fluorine group, a chlorine group, a bromine group, and an iodine group.

8. The secondary battery according to claim 6 , wherein

the compound represented by the Formula (2) is one or more of compounds represented by following Formula (2-1) to Formula (2-12)

the compound represented by the Formula (3) is one or more of compounds represented by following Formula (3-1) to Formula (3-17), and

the compound represented by the Formula (4) is one or more of compounds represented by following Formula (4-1) to Formula (4-9).

9. The secondary battery according to claim 6 , wherein a content of the non-cyano compound in the electrolytic solution is from about 0.001 weight percent to about 2 weight percent both inclusive.

10. The secondary battery according to claim 1 , wherein the secondary battery is a lithium secondary battery.

11. An electrolytic solution comprising

a cyano compound including a compound represented by a following Formula

where R3 is one of a saturated hydrocarbon group, an unsaturated hydrocarbon group, an oxygen-containing saturated hydrocarbon group, halogenated groups of the foregoing groups, and groups each obtained by bonding two or more of the foregoing groups to one another; R4 is one of a cyano-group-containing group, halogenated groups thereof, and groups each obtained by bonding two or more of the foregoing groups to one another; a cyano group in the cyano-group-containing group is bonded to an oxygen atom at a terminal of a —C(═O)—O— bond with one or more carbon atoms in between; (D) when the R3 includes an unsaturated carbon bond, number of the cyano group in the R4 is one or larger; (E) when the R3 does not include the unsaturated carbon bond and the R4 includes the unsaturated carbon bond, the number of the cyano group in the R4 is one or larger; and (F) when the R3 does not include the unsaturated carbon bond and the R4 does not include the unsaturated carbon bond, the number of the cyano group in the R4 is two or larger,

wherein the compound represented by the Formula (1) is one or more of compounds represented by following Formula (1-1) to Formula (1-2).

12. A battery pack comprising:

a secondary battery;

a control section controlling a used state of the secondary battery; and

a switch section switching the used state of the secondary battery according to an instruction of the control section, wherein

the secondary battery includes

a cathode,

an anode, and

an electrolytic solution including a cyano compound, the cyano compound including a compound represented by a following Formula (1),

where R3 is one of a saturated hydrocarbon group, an unsaturated hydrocarbon group, an oxygen-containing saturated hydrocarbon group, halogenated groups of the foregoing groups, and groups each obtained by bonding two or more of the foregoing groups to one another; R4 is one of a cyano-group-containing group, halogenated groups thereof, and groups each obtained by bonding two or more of the foregoing groups to one another; a cyano group in the cyano-group-containing group is bonded to an oxygen atom at a terminal of a —C(═O)—O— bond with one or more carbon atoms in between; (D) when the R3 includes an unsaturated carbon bond, number of the cyano group in the R4 is one or larger; (E) when the R3 does not include the unsaturated carbon bond and the R4 includes the unsaturated carbon bond, the number of the cyano group in the R4 is one or larger; and (F) when the R3 does not include the unsaturated carbon bond and the R4 does not include the unsaturated carbon bond, the number of the cyano group in the R4 is two or larger,

wherein the compound represented by the Formula (1) is one or more of compounds represented by following Formula (1-1) to Formula (1-2).

13. An electric vehicle comprising:

a secondary battery;

a conversion section converting electric power supplied from the secondary battery into drive power;

a drive section operating according to the drive power; and

a control section controlling a used state of the secondary battery, wherein the secondary battery includes

a cathode,

an anode, and

an electrolytic solution including a cyano compound, the cyano compound including a compound represented by a following Formula (1),

where R3 is one of a saturated hydrocarbon group, an unsaturated hydrocarbon group, an oxygen-containing saturated hydrocarbon group, halogenated groups of the foregoing groups, and groups each obtained by bonding two or more of the foregoing groups to one another; R4 is one of a cyano-group-containing group, halogenated groups thereof, and groups each obtained by bonding two or more of the foregoing groups to one another; a cyano group in the cyano-group-containing group is bonded to an oxygen atom at a terminal of a —C(═O)—O— bond with one or more carbon atoms in between; (D) when the R3 includes an unsaturated carbon bond, number of the cyano group in the R4 is one or larger; (E) when the R3 does not include the unsaturated carbon bond and the R4 includes the unsaturated carbon bond, the number of the cyano group in the R4 is one or larger; and (F) when the R3 does not include the unsaturated carbon bond and the R4 does not include the unsaturated carbon bond, the number of the cyano group in the R4 is two or larger,

wherein the compound represented by the Formula (1) is one or more of compounds represented by following Formula (1-1) to Formula (1-2).

14. An electric power storage system comprising:

a secondary battery;

one or more electric devices supplied with electric power from the secondary battery; and

a control section controlling the supplying of the electric power from the secondary battery to the one or more electric devices, wherein

the secondary battery includes

a cathode,

an anode, and

an electrolytic solution including a cyano compound, the cyano compound including a compound represented by a following Formula (1),

where R3 is one of a saturated hydrocarbon group, an unsaturated hydrocarbon group, an oxygen-containing saturated hydrocarbon group, halogenated groups of the foregoing groups, and groups each obtained by bonding two or more of the foregoing groups to one another; R4 is one of a cyano-group-containing group, halogenated groups thereof, and groups each obtained by bonding two or more of the foregoing groups to one another; a cyano group in the cyano-group-containing group is bonded to an oxygen atom at a terminal of a —C(═O)—O— bond with one or more carbon atoms in between; (D) when the R3 includes an unsaturated carbon bond, number of the cyano group in the R4 is one or larger; (E) when the R3 does not include the unsaturated carbon bond and the R4 includes the unsaturated carbon bond, the number of the cyano group in the R4 is one or larger; and (F) when the R3 does not include the unsaturated carbon bond and the R4 does not include the unsaturated carbon bond, the number of the cyano group in the R4 is two or larger;

wherein the compound represented by the Formula (1) is one or more of compounds represented by following Formula (1-1) to Formula (1-2).

15. An electric power tool comprising:

a secondary battery; and

a movable section supplied with electric power from the secondary battery, wherein

the secondary battery includes

a cathode,

an anode, and

an electrolytic solution including a cyano compound, the cyano compound including a compound represented by a following Formula (1),

where R3 is one of a saturated hydrocarbon group, an unsaturated hydrocarbon group, an oxygen-containing saturated hydrocarbon group, halogenated groups of the foregoing groups, and groups each obtained by bonding two or more of the foregoing groups to one another; R4 is one of a cyano-group-containing group, halogenated groups thereof, and groups each obtained by bonding two or more of the foregoing groups to one another; a cyano group in the cyano-group-containing group is bonded to an oxygen atom at a terminal of a —C(═O)—O— bond with one or more carbon atoms in between; (D) when the R3 includes an unsaturated carbon bond, number of the cyano group in the R4 is one or larger; (E) when the R3 does not include the unsaturated carbon bond and the R4 includes the unsaturated carbon bond, the number of the cyano group in the R4 is one or larger; and (F) when the R3 does not include the unsaturated carbon bond and the R4 does not include the unsaturated carbon bond, the number of the cyano group in the R4 is two or larger,

wherein the compound represented by the Formula (1) is one or more of compounds represented by following Formula (1-1) to Formula (1-2).

16. An electronic apparatus comprising

a secondary battery as an electric power supply source, wherein

the secondary battery includes

a cathode,

an anode, and

an electrolytic solution including a cyano compound, the cyano compound including a compound represented by a following Formula (1),

where R3 is one of a saturated hydrocarbon group, an unsaturated hydrocarbon group, an oxygen-containing saturated hydrocarbon group, halogenated groups of the foregoing groups, and groups each obtained by bonding two or more of the foregoing groups to one another; R4 is one of a cyano-group-containing group, halogenated groups thereof, and groups each obtained by bonding two or more of the foregoing groups to one another; a cyano group in the cyano-group-containing group is bonded to an oxygen atom at a terminal of a —C(═O)—O— bond with one or more carbon atoms in between; (D) when the R3 includes an unsaturated carbon bond, number of the cyano group in the R4 is one or larger; (E) when the R3 does not include the unsaturated carbon bond and the R4 includes the unsaturated carbon bond, the number of the cyano group in the R4 is one or larger; and (F) when the R3 does not include the unsaturated carbon bond and the R4 does not include the unsaturated carbon bond, the number of the cyano group in the R4 is two or larger,

wherein the compound represented by the Formula (1) is one or more of compounds represented by following Formula (1-1) to Formula (1-2)