Nonaqueous electrolytic solution and nonaqueous electrolyte battery
View Patent ↗A nonaqueous electrolytic solution that can provide a battery that is low in gas generation, has a large capacity, and is excellent in storage characteristics and cycle characteristics contains an electrolyte and a nonaqueous solvent dissolving the electrolyte and further contains 0.001 vol % or more and less than 1 vol % of a compound represented by Formula (1) in the nonaqueous solvent. Alternatively, the nonaqueous electrolytic solution contains 0.001 vol % or more and less than 5 vol % of a compound represented by Formula (1) in the nonaqueous solvent and further contains at least one compound selected from the group consisting of cyclic carbonate compounds having carbon-carbon unsaturated bonds, cyclic carbonate compounds having fluorine atoms, monofluorophosphates, and difluorophosphates. In Formula (1), R 1 to R 3 each independently represent an alkyl group of 1 to 12 carbon atoms, which may be substituted by a halogen atom; and n represents an integer of 0 to 6.
1. A nonaqueous electrolyte battery comprising:
a negative electrode,
a positive electrode, and
a nonaqueous electrolytic solution,
wherein:
the negative electrode and the positive electrode each can absorb and desorb lithium ions,
the negative electrode comprises a carbonaceous material, and
the nonaqueous electrolytic solution comprises an electrolyte dissolved in a nonaqueous solvent, wherein the electrolyte comprises LiPF 6 and LiBF 4 , and wherein the nonaqueous solvent comprises 0.001 vol % or more and less than 1 vol % of a compound represented by Formula (1),
wherein R 1 and R 2 each independently represent an alkyl group of 1 to 12 carbon atoms, optionally substituted by a halogen atom; R 3 represents a methyl group or an ethyl group; and n represents an integer of 0 to 6.
2. The nonaqueous electrolyte battery according to claim 1 , wherein a ratio of LiBF 4 to a total amount of LiPF 6 and LiBF 4 is in a range of 0.01 to 20 wt %.
3. The nonaqueous electrolyte battery according to claim 1 , wherein a ratio of LiBF 4 to a total amount of LiPF 6 and LiBF 4 is in a range of 0.1 to 5 wt %.
4. The nonaqueous electrolyte battery according to claim 1 , comprising 0.7 mol/L to 1.5 mol/L of the electrolyte.
5. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous solvent comprises ethylene carbonate.
6. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous solvent comprises at least one dialkyl carbonate selected from the group consisting of dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate.
7. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous solvent comprises ethylene carbonate and at least one dialkyl carbonate selected from the group consisting of dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate.
8. The nonaqueous electrolyte battery according to claim 7 , wherein a ratio of ethylene carbonate to a total amount of ethylene carbonate and the at least one dialkyl carbonate is in a range of 5 to 50 vol %.
9. The nonaqueous electrolyte battery according to claim 7 , wherein a ratio of ethylene carbonate to a total amount of ethylene carbonate and the at least one dialkyl carbonate is in a range of 15 to 25 vol %.
10. The nonaqueous electrolyte battery according to claim 7 , wherein the nonaqueous solvent comprises ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate.
11. The nonaqueous electrolyte battery according to claim 1 , wherein n is 1 or 2.
12. The nonaqueous electrolyte battery according to claim 1 , wherein the compound represented by Formula (1) is triethyl phosphonoacetate.
13. The nonaqueous electrolyte battery according to claim 1 , wherein the compound represented by Formula (1) is triethyl phosphonoformate.
14. The nonaqueous electrolyte battery according to claim 1 , wherein the compound represented by Formula (1) is triethyl-3-phosphonopropionate.
15. A nonaqueous electrolyte battery comprising:
a negative electrode,
a positive electrode, and
a nonaqueous electrolytic solution,
wherein:
the negative electrode and the positive electrode each can absorb and desorb lithium ions,
the negative electrode comprises a carbonaceous material, and
the nonaqueous electrolytic solution comprises an electrolyte dissolved in a nonaqueous solvent,
wherein the nonaqueous solvent comprises:
(i) 0.001 vol % or more and less than 1 vol % of a compound represented by Formula (1),
wherein R 1 and R 2 each independently represent an alkyl group of 1 to 12 carbon atoms, optionally substituted by a halogen atom; R 3 represents a methyl group or an ethyl group; and n represents an integer of 0 to 6;
(ii) ethylene carbonate; and
(iii) at least one dialkyl carbonate selected from the group consisting of dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate,
wherein a ratio of ethylene carbonate to a total amount of ethylene carbonate and the at least one dialkyl carbonate is in a range of 5 to 50 vol %.
16. The nonaqueous electrolyte battery according to claim 15 , wherein the ratio of ethylene carbonate to the total amount of ethylene carbonate and the at least one dialkyl carbonate is in a range of 15 to 25 vol %.
17. A nonaqueous electrolyte battery comprising:
a negative electrode,
a positive electrode, and
a nonaqueous electrolytic solution,
wherein:
the negative electrode and the positive electrode each can absorb and desorb lithium ions,
the negative electrode comprises a carbonaceous material, and
the nonaqueous electrolytic solution comprises an electrolyte dissolved in a nonaqueous solvent,
wherein the nonaqueous solvent comprises:
(i) 0.001 vol % or more and less than 1 vol % of a compound represented by Formula (1),
wherein R 1 and R 2 each independently represent an alkyl group of 1 to 12 carbon atoms, optionally substituted by a halogen atom; R 3 represents a methyl group or an ethyl group; and n represents an integer of 0 to 6;
(ii) ethylene carbonate;
(iii) dimethyl carbonate; and
(iv) ethyl methyl carbonate.