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

1. A secondary battery comprising:

a positive electrode;

a negative electrode; and

an electrolytic solution including heterocyclic compound represented by formula (2):

wherein X is selected from the group consisting of a (nitrogen atom)-(hydrogen atom) (NH), an oxygen atom (O) and a (phosphorus atom)-(hydrogen atom) (PH), and combinations thereof; and R5 to R8 independently represent any one group selected from the group consisting of a hydrogen group, a halogen group, a monovalent hydrocarbon group, a monovalent halogenated hydrocarbon group, a monovalent oxygen-containing group, a monovalent nitrogen-containing group, a monovalent sulfur-containing group, and a monovalent group formed by bonding two or more of the aforementioned groups to each other, and combinations thereof, wherein at least one of R5 to R8 represents any one group selected from a halogen group, a monovalent halogenated hydrocarbon group, a monovalent oxygen-containing group, a monovalent nitrogen-containing group, a monovalent sulfur-containing group, and a monovalent group formed by bonding two or more of the aforementioned groups to each other, and combinations thereof, and wherein at least two of the R5 to R8 each represent a perfluoroalkyl group.

2. The secondary battery according to claim 1 , wherein:

the halogen group includes at least one of a fluorine group (—F), a chlorine group (—Cl), a bromine group (—Br) and a iodine group (—I);

the monovalent hydrocarbon group includes at least one of an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an aryl group and a monovalent group formed by bonding two or more of the aforementioned groups to each other;

the monovalent halogenated hydrocarbon group includes a group produced by substituting at least one hydrogen group in the monovalent hydrocarbon group by the halogen group;

the monovalent oxygen-containing group includes at least one of a hydroxyl group (—OH), an alkoxy group (—0R101: wherein R101 represents any one group selected from an alkyl group and an aryl group, and combinations thereof), a carboxyl group (—COOH), a carboxylic acid ester group (—COOR102: wherein R102 represents any one group selected from an alkyl group and an aryl group, and combinations thereof), an aldehyde group (—CHO) and an acyl group (—COR103: wherein R103 represents any one group selected from an alkyl group and an aryl group, and combinations thereof);

the monovalent nitrogen-containing group includes at least one of a cyano group (—CN), an amino group (—NR104R105: wherein R104 and R105 independently represent any one group selected from a hydrogen group, an alkyl group and an aryl group, and combinations thereof), a nitro group (—NO 2 ), a nitroso group (—NO), an isocyanate group (—NCO), an azide group (—N 3 ) and a diazonium group (—N s + ); and

the monovalent sulfur-containing group includes at least one of a sulfo group (—SO 3 H), a thiol group (—SH), a thioether group (—SR106: wherein R106 represents any one group selected from an alkyl group and an aryl group, and combinations thereof) and a thioketone group (—CS—R107: wherein R107 represents any one group selected from an alkyl group and an aryl group, and combinations thereof).

3. The secondary battery according to claim 1 , wherein each of the R5 and the R8 represents the perfluoroalkyl group.

4. The secondary battery according to claim 1 , wherein the number of carbon atoms in the perfluoroalkyl group is from 1 to 10.

5. The secondary battery according to claim 1 , wherein the electrolytic solution includes at least one compound selected from unsaturated cyclic carbonic acid esters respectively represented by formula (3) to formula (5) and halogenated carbonic acid esters respectively represented by formula (6) and formula (7):

wherein R11 and R12 independently represent any one group selected from a hydrogen group and an alkyl group, and combinations thereof; R13 to R16 independently represent any one group selected from a hydrogen group, an alkyl group, a vinyl group and an allyl group, and combinations thereof, wherein at least one of R13 to R16 represents any one group selected from a vinyl group and an allyl group, and combinations thereof; and R17 represents a group represented by a formula>CR171R172, wherein R171 and R172 independently represent any one group selected from a hydrogen group and an alkyl group, and combinations thereof; and

wherein R18 to R21 independently represent any one group selected from a hydrogen group, a halogen group, an alkyl group and a halogenated alkyl group, and combinations thereof, wherein at least one of R18 to R21 represents any one group selected from a halogen group and a halogenated alkyl group; and R22 to R27 independently represent any one group selected from a hydrogen group, a halogen group, an alkyl group and a halogenated alkyl group, and combinations thereof, wherein at least one of R22 to R27 represents any one group selected from a halogen group and a halogenated alkyl group, and combinations thereof.

6. The secondary battery according to claim 1 , wherein the electrolytic solution includes at least one dinitrile compound represented by formula (9):

NC—R28—CN  (9)

wherein R28 represents any one group selected from a bivalent hydrocarbon group, a bivalent halogenated hydrocarbon group, a bivalent oxygen-containing group, a bivalent nitrogen-containing group, a bivalent sulfur-containing group, a bivalent phosphorus-containing group, and a bivalent group formed by bonding two or more of the aforementioned groups to each other, and combinations thereof.

7. The secondary battery according to claim 1 , wherein the electrolytic solution includes propylene carbonate.

8. The secondary battery according to claim 1 , wherein the secondary battery includes a lithium ion secondary battery.

9. An electric vehicle comprising:

the secondary battery according to claim 1 ;

a converter configured to convert an electric power supplied from the secondary battery to a driving force;

a driver configured to drive in response to the driving force; and

a controller configured to control an operation of the secondary battery.

10. An electric power storage system comprising:

the secondary battery according to claim 1 ;

at least one electric device to which an electric power is configured to be supplied from the secondary battery; and

a controller configured to control the supply of an electric power from the secondary battery to the electric device.

11. An electric power tool comprising:

the secondary battery according to claim 1 ; and

a movable unit to which an electric power is configured to be supplied from the secondary battery.

12. An electronic device comprising the secondary battery according to claim 1 as an electric power supply source.

13. An electrolytic solution for a secondary battery, comprising heterocyclic compound represented by formula (2):

wherein X is selected from the group consisting of a (nitrogen atom)-(hydrogen atom) (NH), an oxygen atom (O) and a (phosphorus atom)-(hydrogen atom) (PH), and combinations thereof; and R5 to R8 independently represent any one group selected from the group consisting of a hydrogen group, a halogen group, a monovalent hydrocarbon group, a monovalent halogenated hydrocarbon group, a monovalent oxygen-containing group, a monovalent nitrogen-containing group, a monovalent sulfur-containing group, and a monovalent group formed by bonding two or more of the aforementioned groups to each other, and combinations thereof, wherein at least one of R5 to R8 represents any one group selected from a halogen group, a monovalent halogenated hydrocarbon group, a monovalent oxygen-containing group, a monovalent nitrogen-containing group, a monovalent sulfur-containing group, and a monovalent group formed by bonding two or more of the aforementioned groups to each other, and combinations thereof, and wherein at least two of the R5 to R8 each represent a perfluoroalkyl group.

14. A battery pack comprising:

a secondary battery;

a controller configured to control an operation of the secondary battery; and

a switch configured to switch an operation of the secondary battery in response to a command from the controller,

wherein the secondary battery includes:

a positive electrode;

a negative electrode; and

an electrolytic solution including a second heterocyclic compound represented by formula (2):

wherein X is selected from the group consisting of a (nitrogen atom)-(hydrogen atom) (NH), an oxygen atom (O) and a (phosphorus atom)-(hydrogen atom) (PH), and combinations thereof; and R5 to R8 independently represent any one group selected from the group consisting of a hydrogen group, a halogen group, a monovalent hydrocarbon group, a monovalent halogenated hydrocarbon group, a monovalent oxygen-containing group, a monovalent nitrogen-containing group, a monovalent sulfur-containing group, and a monovalent group formed by bonding two or more of the aforementioned groups to each other, and combinations thereof, wherein at least one of R5 to R8 represents any one group selected from a halogen group, a monovalent halogenated hydrocarbon group, a monovalent oxygen-containing group, a monovalent nitrogen-containing group, a monovalent sulfur-containing group, and a monovalent group formed by bonding two or more of the aforementioned groups to each other, and combinations thereof, and wherein at least two of the R5 to R8 each represent a perfluoroalkyl group.