| 摘要 |
The present invention aims to provide a nonaqueous electrolyte solution which enables production of a lithium ion secondary cell excellent in high temperature storage characteristics and cycling characteristics at high voltages. The present invention relates to a nonaqueous electrolyte solution including:
a nonaqueous solvent; and
an electrolyte salt;
wherein the nonaqueous solvent contains
a fluorinated linear carbonate (A) represented by Formula (1):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒRfOCOOR€ƒ€ƒ€ƒ€ƒ€ƒ(1)
where Rf represents a C1-4 fluorinated alkyl group and R represents a C1-4 alkyl group, and
at least one cyclic carbonate (B) selected from the group consisting of ethylene carbonate, propylene carbonate, and fluoroethylene carbonate, and
the nonaqueous solvent also contains
at least one compound (±) selected from the group consisting of
(I) a compound represented by Formula (2):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒRfOH€ƒ€ƒ€ƒ€ƒ€ƒ(2)
where Rf is defined as above,
(II) a compound represented by Formula (3)
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒROH€ƒ€ƒ€ƒ€ƒ€ƒ(3)
where R is defined as above, and
(III) a compound represented by Formula (4):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒROCOCl€ƒ€ƒ€ƒ€ƒ€ƒ(4)
where R is defined as above, and
at least one compound (²) selected from the group consisting of
(IV) a compound represented by Formula (5):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒHO(CH 2 CH 2 ) n OH€ƒ€ƒ€ƒ€ƒ€ƒ(5)
where n is an integer of 1 to 5,
(V) a compound represented by Formula (6):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒHO(CHCH 3 CH 2 ) n OH€ƒ€ƒ€ƒ€ƒ€ƒ(6)
where n is an integer of 1 to 5, and
(VI) a compound represented by Formula (7):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒHO(CHFCH 2 ) n OH€ƒ€ƒ€ƒ€ƒ€ƒ(7)
where n is an integer of 1 to 5,
the compound (±) being contained in an amount of 5000 ppm or less based on the amount of the fluorinated linear carbonate (A),
the compound (²) being contained in an amount of 50 ppm or less based on the amount of the cyclic carbonate (B). |
