Method for producing secondary battery

Patent metadata

Field	Value
Publication number	US-9859589-B2
Application number	US-201415103402-A
Country	US
Kind code	B2
Filing date	Aug 8, 2014
Priority date	Dec 11, 2013
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

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.

First claim

The invention claimed is:

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 .

Assignees

• Nec Corp

Inventors

• Iriyama Jiro
• Otohata Makihiro
• Matsumoto Kazuaki
• Shimanuki Ikiko

Classifications

• H01M50/664

  Temporary seals, e.g. for storage of instant batteries or seawater batteries · CPC title

• H01M50/609

  Arrangements or processes for filling with liquid, e.g. electrolytes · CPC title

• H01M10/446

  Initial charging measures · CPC title

• H01M10/0585 Primary

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M10/05

  Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence) · CPC title