Method for producing secondary battery
It is an object of the present invention to provide a method for producing a secondary battery in which water in the outer package can be removed even when the secondary battery includes an electrolytic solution containing a halogen-containing compound. The present exemplary embodiment is a method for producing a secondary battery including an electrolytic solution containing a supporting salt, a nonaqueous solvent, and a halogen-containing compound, an electrode assembly including a negative electrode and a positive electrode, and an outer package, the method including (1) disposing a first solution containing at least the supporting salt and the nonaqueous solvent, and the electrode assembly in the outer package; (2) charging the electrode assembly; (3) emitting from the outer package a gas generated by the charge; and (4) injecting a second solution including at least the halogen-containing compound into the outer package after the gas is emitted, wherein the first solution does not contain the halogen-containing compound, and the electrolytic solution includes the first solution and the second solution.
1. A method for producing a secondary battery comprising an electrolytic solution comprising a supporting salt, a nonaqueous solvent, and a halogen-containing compound, an electrode assembly comprising a negative electrode and a positive electrode, and an outer package, the method comprising:
(1) disposing a first solution comprising at least the supporting salt and the nonaqueous solvent, and the electrode assembly in the package;
(2) charging the electrode assembly;
(3) emitting from the package a gas generated by the charge; and
(4) injecting a second solution comprising at least the halogen-containing compound into the package after the gas is emitted,
wherein the first solution does not comprise the halogen-containing compound, and
the electrolytic solution comprises the first solution and the second solution.
2. The method for producing a secondary battery according to claim 1 , wherein the halogen-containing compound is at least one selected from the group consisting of a halogen-containing carbonate compound, a halogen-containing ether compound, and a halogen-containing ester compound.
3. The method for producing a secondary battery according to claim 1 , wherein the halogen-containing compound is a halogen-containing carbonate compound.
4. The method for producing a secondary battery according to claim 1 , wherein the halogen-containing compound is a halogen-containing ether compound.
5. The method for producing a secondary battery according to claim 1 , wherein the halogen-containing compound is a halogen-containing ester compound.
6. The method for producing a secondary battery according to claim 2 , wherein the halogen-containing carbonate compound is represented by the following formula (1-1) or the following formula (1-2):
wherein R 101 is a fluorine-substituted alkylene group or a fluorine-substituted alkenylene group;
wherein R 102 and R 103 each independently represent an alkyl group or a fluorine-substituted alkyl group, and at least one of R 102 and R 103 is a fluorine-substituted alkyl group.
7. The method for producing a secondary battery according to claim 2 , wherein the halogen-containing ether compound is represented by the following formula (2-1) or the following formula (2-2):
[Formula 3]
R 201 —O—R 202 (2-1)
wherein R 201 and R 202 each independently represent an alkyl group or a fluorine-substituted alkyl group, and at least one of R 201 and R 202 is a fluorine-substituted alkyl group;
wherein R 203 represents a fluorine-substituted alkylene group that may comprise one ether group disposed between carbon atoms.
8. The method for producing a secondary battery according to claim 2 , wherein the halogen-containing ester compound is represented by the following formula (3-1):
wherein R 301 and R 302 each independently represent an alkyl group or a fluorine-substituted alkyl group, and at least one of R 301 and R 302 is a fluorine-substituted alkyl group.
9. The method for producing a secondary battery according to claim 1 , wherein the charge is performed until voltage reaches 2.3 V or more.
10. The method for producing a secondary battery according to claim 1 , wherein a content of the halogen-containing compound in the second solution is 6.0% by mass or more.
11. The method for producing a secondary battery according to claim 1 , wherein the second solution further comprises the supporting salt and the nonaqueous solvent in addition to the halogen-containing compound.
12. The method for producing a secondary battery according to claim 1 , wherein a content of the halogen-containing compound in the electrolytic solution is 0.1 to 10% by mass.
13. The method for producing a secondary battery according to claim 1 , wherein the negative electrode comprises a negative electrode active material layer, the negative electrode active material layer comprises a negative electrode active material and a negative electrode binding agent, and the negative electrode binding agent is a water-dispersible polymer.
14. The method for producing a secondary battery according to claim 1 , wherein the positive electrode comprises a positive electrode active material layer, the positive electrode active material layer comprises a positive electrode active material and a positive electrode binding agent, and the positive electrode binding agent is a water-dispersible polymer.
15. The method for producing a secondary battery according to claim 1 , comprising a step of discharging after the step (2) and before the step (4).
16. The method for producing a secondary battery according to claim 1 , wherein the secondary battery is a stacked laminate type.
17. A secondary battery fabricated by the method for producing a secondary battery according to claim 1 .