Non-aqueous 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

non-aqueous electrolytic solution including a boron compound, the boron compound including six or more boron (B) atoms, and including an octavalent boron-hydrogen-containing structure represented by Formula (1), a dodecavalent boron-carbon-containing structure represented by Formula (2), or both,

wherein the boron compound includes at least one compound that (i) consists of boron and hydrogen as constituent elements, (ii) includes the octavalent boron-hydrogen-containing structure represented by Formula (1) and (iii) is represented by Formula (3):

B x H y   (3),

where x is an integer from 6 to 18 both inclusive, and y is an integer from 10 to 22 both inclusive.

2. The secondary battery according to claim 1 , wherein the boron compound further includes one or more of compounds represented by respective Formulas (4) to (6):

C 2 B 10 R1 12   (4)

where each of R1s is one of a hydrogen group, a halogen group, a monovalent hydrocarbon group, a monovalent halogenated hydrocarbon group, and a monovalent group obtained by bonding two or more thereof,

M1 + [C 2 B 9 R2 12 ] −   (5)

where M1 + is one of a monovalent metal cation of a metal element belonging to Group 1 in long form of periodic table and a monovalent non-metal cation represented by NR3 4 + ; and each of R2s and R3s is one of a hydrogen group, a halogen group, a monovalent hydrocarbon group, a monovalent halogenated hydrocarbon group, and a monovalent group obtained by bonding two or more thereof,

M2 + [M3(C 2 B 9 R4 12 ) 2 ] −   (6)

where M2 + is one of a monovalent metal cation of a metal element belonging to Group 1 in the long form of periodic table and a monovalent non-metal cation represented by NR5 4 + ; M3 is a divalent metal element belonging to Groups 2 to 16 in the long form of periodic table; and each of R4s and R5s is one of a hydrogen group, a halogen group, a monovalent hydrocarbon group, a monovalent halogenated hydrocarbon group, and a monovalent group obtained by bonding two or more thereof.

3. The secondary battery according to claim 2 , wherein

the halogen group is one of a fluorine group (—F), a chlorine group (—Cl), a bromine group (—Br), and an iodine group (—I),

the monovalent hydrocarbon group is one of an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an aryl group, and a monovalent group obtained by bonding two or more thereof,

the monovalent halogenated hydrocarbon group is a group obtained by substituting one or more halogen groups for one or more hydrogen groups in the monovalent hydrocarbon group,

the monovalent metal cation is one of a lithium ion (Li + ), a sodium ion (Na + ), a potassium ion (K + ), a rubidium ion (Rb + ), and a cesium ion (Cs + ),

the monovalent non-metal cation is one of an ammonium ion (NH 4 + ), a trimethylammonium ion ((CH 3 ) 3 NH + ), a triethylammonium ion ((C 2 H 5 ) 3 NH + ), a tripropylammonium ion ((C 3 H 7 ) 3 NH + ), a tributylammonium ion ((C 4 H 9 ) 3 NH + ), a tetramethylammonium ion ((CH 3 ) 4 N + ), a tetraethylammonium ion ((C 2 H 5 ) 4 N + ), and a tetrabutylammonium ion ((C 4 H 9 ) 4 N + ), and

the divalent metal element is one of cobalt (Co) and nickel (Ni).

4. The secondary battery according to claim 2 , wherein

the boron compound represented by Formula (3) is one of B 6 H 10 , B 10 H 14 , and B 18 H 22 ,

the boron compound represented by Formula (4) is one of C 2 B 10 H 12 , C 2 B 10 H 11 CH 3 , and C 2 B 10 H 11 C 6 H 5 ,

the boron compound represented by Formula (5) is one of Li[C 2 B 9 H 12 ], Cs[C 2 B 9 H 12 ], and (C 2 H 5 ) 3 NH[C 2 B 9 H 12 ], and

the boron compound represented by Formula (6) is one of Cs[Co(C 2 B 9 H 12 ) 2 ], K[Co(C 2 B 9 H 12 ) 2 ], (C 4 H 9 ) 4 N[Co(C 2 B 9 H 12 ) 2 ], (CH 3 ) 3 NH[Co(C 2 B 9 H 12 ) 2 ], and (C 2 H 5 ) 3 NH[Co(C 2 B 9 H 12 ) 2 ].

5. The secondary battery according to claim 1 , wherein a content of the boron compound in the non-aqueous electrolytic solution is from about 0.01 weight percent to about 1.5 weight percent both inclusive.

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

7. A non-aqueous electrolytic solution, comprising a boron compound,

the boron compound including six or more boron (B) atoms, and including an octavalent boron-hydrogen-containing structure represented by Formula (1), a dodecavalent boron-carbon-containing structure represented by Formula (2), or both,

wherein the boron compound includes at least one compound that (i) consists of boron and hydrogen as constituent elements, (ii) includes the octavalent boron-hydrogen-containing structure represented by Formula (1) and (iii) is represented by Formula (3):

B x H y   (3),

where x is an integer from 6 to 18 both inclusive, and y is an integer from 10 to 22 both inclusive.

8. A battery pack, comprising:

a secondary battery;

a control section configured to control operation of the secondary battery; and

a switch section configured to switch the operation of the secondary battery according to an instruction of the control section,

the secondary battery including

a cathode,

an anode, and

non-aqueous electrolytic solution including a boron compound, the boron compound including six or more boron (B) atoms, and including an octavalent boron-hydrogen-containing structure represented by Formula (1), a dodecavalent boron-carbon-containing structure represented by Formula (2), or both,

wherein the boron compound includes at least one compound that (i) consists of boron and hydrogen as constituent elements, (ii) includes the octavalent boron-hydrogen-containing structure represented by Formula (1) and (iii) is represented by Formula (3):

B x H y   (3),

where x is an integer from 6 to 18 both inclusive, and y is an integer from 10 to 22 both inclusive.

9. An electric vehicle, comprising:

a secondary battery;

a conversion section configured to convert electric power supplied from the secondary battery into drive power;

a drive section configured to operate according to the drive power; and

a control section configured to control operation of the secondary battery,

the secondary battery including

a cathode,

an anode, and

non-aqueous electrolytic solution including a boron compound, the boron compound including six or more boron (B) atoms, and including an octavalent boron-hydrogen-containing structure represented by Formula (1), a dodecavalent boron-carbon-containing structure represented by Formula (2), or both,

wherein the boron compound includes at least one compound that (i) consists of boron and hydrogen as constituent elements, (ii) includes the octavalent boron-hydrogen-containing structure represented by Formula (1) and (iii) is represented by Formula (3):

B x H y   (3),

where x is an integer from 6 to 18 both inclusive, and y is an integer from 10 to 22 both inclusive.

10. An electric power storage system, comprising:

a secondary battery;

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

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

the secondary battery including

a cathode,

an anode, and

non-aqueous electrolytic solution including a boron compound, the boron compound including six or more boron (B) atoms, and including an octavalent boron-hydrogen-containing structure represented by Formula (1), a dodecavalent boron-carbon-containing structure represented by Formula (2), or both,

wherein the boron compound includes at least one compound that (i) consists of boron and hydrogen as constituent elements, (ii) includes the octavalent boron-hydrogen-containing structure represented by Formula (1) and (iii) is represented by Formula (3):

B x H y   (3),

where x is an integer from 6 to 18 both inclusive, and y is an integer from 10 to 22 both inclusive.

11. An electric power tool, comprising:

a secondary battery; and

a movable section configured to be supplied with electric power from the secondary battery,

the secondary battery including

a cathode,

an anode, and

non-aqueous electrolytic solution including a boron compound, the boron compound including six or more boron (B) atoms, and including an octavalent boron-hydrogen-containing structure represented by Formula (1), a dodecavalent boron-carbon-containing structure represented by Formula (2), or both

wherein the boron compound includes at least one compound that (i) consists of boron and hydrogen as constituent elements, (ii) includes the octavalent boron-hydrogen-containing structure represented by Formula (1) and (iii) is represented by Formula (3):

B x H y   (3),

where x is an integer from 6 to 18 both inclusive, and y is an integer from 10 to 22 both inclusive.

12. An electronic apparatus, comprising

a secondary battery as an electric power supply source,

the secondary battery including

a cathode,

an anode, and

non-aqueous electrolytic solution including a boron compound, the boron compound including six or more boron (B) atoms, and including an octavalent boron-hydrogen-containing structure represented by Formula (1), a dodecavalent boron-carbon-containing structure represented by Formula (2), or both,

wherein the boron compound includes at least one compound that (i) consists of boron and hydrogen as constituent elements, (ii) includes the octavalent boron-hydrogen-containing structure represented by Formula (1) and (iii) is represented by Formula (3):

B x H y   (3),

where x is an integer from 6 to 18 both inclusive, and y is an integer from 10 to 22 both inclusive.