Non-aqueous electrolyte solution and electricity-storage device using same
View Patent ↗A nonaqueous electrolytic solution that is capable of improving the electrochemical characteristics in a broad temperature range, and an energy storage device using the same are provided, and the nonaqueous electrolytic solution contains a nonaqueous solvent having dissolved therein an electrolyte salt, in which the nonaqueous solvent contains two or more kinds of cyclic carbonates selected from ethylene carbonate, propylene carbonate, 1,2-butylene carbonate, 2,3-butylene carbonate, 4-fluoro-1,3-dioxolan-2-one, trans- or cis-4,5-difluoro-1,3-dioxolan-2-one, vinylene carbonate, vinyl ethylene carbonate and 4-ethynyl-1,3-dioxolan-2-one, and the nonaqueous electrolytic solution further contains a cyclic acid anhydride represented by the following general formula (I) having bonded thereto a side chain that has 3 or more carbon atoms and has a double bond or a triple bond at an end thereof in an amount of from 0.01 to 10% by mass: wherein R 1 and R 2 each independently represent a hydrogen atom, a halogen atom or an alkyl group having from 1 to 6 carbon atoms, at least one hydrogen atom of which may be substituted by a halogen atom; and R 3 represents a linear or branched alkenyl group having from 2 to 4 carbon atoms and having a double bond at an end thereof or a linear or branched alkynyl group having from 2 to 4 carbon atoms and having a triple bond at an end thereof.
1. A nonaqueous electrolytic solution, comprising:
a nonaqueous solvent having dissolved therein an electrolyte salt,
wherein the nonaqueous solvent comprises two or more kinds of cyclic carbonates selected from the group consisting of ethylene carbonate, propylene carbonate, 1,2-butylene carbonate, 2,3-butylene carbonate, 4-fluoro-1,3-dioxolan-2-one, trans- or cis-4,5-difluoro-1 3-dioxolan-2-one, vinylene carbonate, vinyl ethylene carbonate and 4-ethynyl-1,3-dioxolan-2-one,
the nonaqueous electrolytic solution further comprises a cyclic acid anhydride of formula (I) in an amount of from 0.01 to 10% by mass:
wherein
R 1 and R 2 are each independently a hydrogen atom, a halogen atom or an alkyl group having from 1 to 6 carbon atoms, wherein a hydrogen atom on the alkyl group may be substituted by a halogen atom; and
R 3 is a linear or branched alkenyl group having from 2 to 4 carbon atoms and having a double bond at a free end of the linear or branched alkenyl group or a linear or branched alkynyl group having from 2 to 4 carbon atoms and having a triple bond at a free end of the linear or branched alkynyl group.
2. The nonaqueous electrolytic solution according to claim 1 , wherein the cyclic acid anhydride of formula (I) is at least one selected from the group consisting of 3-allyldihydrofuran-2,5-dione, 3-(3-methylallyl)dihy drofuran-2,5-dione, 3-(3,3-dimethylallyl)dihydrofuran-2,5-dione, 3-(2-methylallyl)dihydrofuran-2,5-dione, 3-(2,3-dimethylallyl)dihydrofuran-2,5-dione, 3-(2,3,3-trimethylallyl)dihydrofuran-2,5-dione, 3-(2-propyne-1-yl)dihydrofuran-2,5-dione, 3-(1-methyl-2-propyne-1-yl)dihydrofuran-2,5-dione and 3-(1,1-dimethyl-2-propyne-1-yl)dihydrofuran-2,5-dione.
3. The nonaqueous electrolytic solution according to claim 1 , wherein the cyclic carbonate is at least one selected from the group consisting of ethylene carbonate, propylene carbonate, vinylene carbonate and vinyl ethylene carbonate.
4. The nonaqueous electrolytic solution according to claim 1 , wherein the nonaqueous solvent further comprises a linear ester.
5. An energy storage device, comprising:
a positive electrode;
a negative electrode; and
the nonaqueous electrolytic solution according to claim 4 .
6. The energy storage device according to claim 5 , wherein the positive electrode comprises active material which is a complex metal oxide of lithium comprising at least one selected from the group consisting of cobalt, manganese and nickel, or a lithium-comprising olivine-type phosphate comprising at least one selected from the group consisting of iron, cobalt, nickel and manganese.
7. The energy storage device according to claim 5 , wherein the negative electrode comprises active material which comprises at least one selected from the group consisting of lithium metal, a lithium alloy, a carbon material capable of absorbing and releasing lithium, tin, a tin compound, silicon, a silicon compound and a lithium titanate compound.
8. The nonaqueous electrolytic solution according to claim 4 , wherein the linear ester is at least one selected from the group consisting of an asymmetric linear carbonate selected from methyl ethyl carbonate, methyl propyl carbonate, methyl isopropyl carbonate, methyl butyl carbonate and ethyl propyl carbonate, a symmetric linear carbonate selected from dimethyl carbonate, diethyl carbonate, dipropyl carbonate and dibutyl carbonate, and a linear carboxylate ester.
9. An energy storage device, comprising:
a positive electrode;
a negative electrode; and
the nonaqueous electrolytic solution according to claim 8 .
10. The energy storage device according to claim 9 , wherein the positive electrode comprises active material which is a complex metal oxide of lithium comprising at least one selected from the group consisting of cobalt, manganese and nickel, or a lithium-comprising olivine-type phosphate comprising at least one selected from the group consisting of iron, cobalt, nickel and manganese.
11. The energy storage device according to claim 9 , wherein the negative electrode comprises active material which comprises at least one selected from the group consisting of lithium metal, a lithium alloy, a carbon material capable of absorbing and releasing lithium, tin, a tin compound, silicon, a silicon compound and a lithium titanate compound.
12. The nonaqueous electrolytic solution according to claim 1 , wherein the nonaqueous solvent further comprises an aromatic compound comprising a fluorine atom, a tert-alkyl group, or both.
13. The nonaqueous electrolytic solution according to claim 1 , wherein the nonaqueous solvent further comprises a nitrile.
14. The nonaqueous electrolytic solution according to claim 1 , wherein the electrolyte salt comprises at least one selected from the group consisting of LiPF 6 , LiPO 2 F 2 , Li 2 PO 3 F, LiBF 4 , LiN(SO 2 CF 3 ) 2 , LiN(SO 2 C 2 F 5 ) 2 , LiN(SO 2 F) 2 , lithium difluorobis[oxalate-O,O′]phosphate and lithium tetrafluoro[oxalate-O,O′]phosphate.
15. The nonaqueous electrolytic solution according to claim 1 , wherein the electrolyte salt is present at a concentration of from 0.3 to 2.5 M with respect to the nonaqueous solvent.
16. An energy storage device, comprising:
a positive electrode;
a negative electrode; and
the nonaqueous electrolytic solution according to claim 1 .
17. The energy storage device according to claim 16 , wherein the positive electrode comprises active material which is a complex metal oxide of lithium comprising at least one selected from the group consisting of cobalt, manganese and nickel, or a lithium-comprising olivine-type phosphate comprising at least one selected from the group consisting of iron, cobalt, nickel and manganese.
18. The energy storage device according to claim 16 , wherein the negative electrode comprises active material which comprises at least one selected from the group consisting of lithium metal, a lithium alloy, a carbon material capable of absorbing and releasing lithium, tin, a tin compound, silicon, a silicon compound and a lithium titanate compound.