Battery cell in which gelation electrolyte solution component is included in pore of separator configuring electrode assembly

Patent metadata

Field	Value
Publication number	US-10490849-B2
Application number	US-201615744488-A
Country	US
Kind code	B2
Filing date	Oct 7, 2016
Priority date	Oct 7, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

The present invention provides a battery cell including: an electrode assembly having a structure in which a separator is interposed between a cathode and an anode, wherein the separator is formed with a plurality of pores and the pores include a gelation electrolyte solution component.

First claim

The invention claimed is:

1. A battery cell, comprising:
a battery case in which an electrode assembly and a liquefied electrolyte solution are sealed and wherein the electrode assembly is impregnated in the liquefied electrolyte solution,
wherein the electrode assembly has a structure in which a separator is in direct physical contact with a cathode and an anode, wherein the separator has a plurality of pores and the pores include a gelation electrolyte solution component.

2. The battery cell of claim 1 , wherein:
the pores formed in the separator have an average diameter of 0.01 μm to 100 μm.

3. The battery cell of claim 1 , wherein:
the separator has porosity of 40% to 90%.

4. The battery cell of claim 1 , wherein:
the gelation electrolyte solution component is formed by polymerizing or curing after the separator is impregnated in a mixed liquid including a liquefied electrolyte solution component in a liquefied monomer and/or oligomer state and an polymerization initiator so that the mixed liquid is inserted into the pores of the separator.

5. The battery cell of claim 4 , wherein:
the liquefied electrolyte solution component in the liquefied monomer and/or oligomer state is at least any one selected from the group consisting of a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, a poly agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, and a polymer including an ionic dissociation group.

6. The battery cell of claim 4 , wherein:
the liquefied electrolyte solution component includes at least any one selected from the group consisting of nitride, halide, and sulfate of Li.

7. The battery cell of claim 4 , wherein:
the polymerization initiator gelates the liquefied electrolyte solution component in the liquefied monomer and/or oligomer state by heat or light applied from the outside.

8. The battery cell of claim 4 , wherein:
the liquefied electrolyte solution component inserted into the pores of the separator is polymerized or cured for 1 hour to 20 hours in a temperature range of 40° C. to 90° C.

9. The battery cell of claim 4 , wherein:
the polymerization initiator includes at least any one selected from the group consisting of benzoyl peroxide (BPO), acetyl peroxide, dilauryl peroxide, di-tertbutylperoxide, cumyl hydroperoxide, hydrogen peroxide, 2,2-azobis (2-cyanobutane), 2,2-azobis (methylbutyronitrile), azobis (isobutyronitrile) (AIBN), and azobisdimethyl-valeronitrile (AMVN).

10. The battery cell of claim 4 , wherein:
a content of the polymerization initiator is 0.01 wt % to 5 wt % with respect to the liquefied electrolyte solution component in the liquefied monomer and/or oligomer state.

11. The battery cell of claim 1 , wherein:
the liquefied electrolyte solution includes at least any one selected from the group consisting of N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma-butylolactone, 1,2-dimethoxyethane, tetrahydroxy franc, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane, acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, ether, methyl pyrophosphate, and ethyl propionate.

12. The battery cell of claim 1 , wherein:
the battery cell is a lithium secondary battery.

13. A method for manufacturing the battery cell of claim 1 , comprising:
a) manufacturing an electrode assembly by interposing a separator between a cathode and an anode;
b) impregnating the electrode assembly manufactured in the step a) into a mixed liquid including an liquefied electrolyte solution component in the liquefied monomer and/or oligomer state and an polymerization initiator;
c) impregnating the electrode assembly in a battery case along with a liquefied electrolyte solution and then sealing the battery case; and
d) polymerizing or curing the liquefied electrolyte solution component in the monomer and/or oligomer state inserted into a pore of the separator.

14. The method of claim 13 , wherein:
the liquefied electrolyte solution component in the monomer and/or oligomer state inserted into the pores of the separator in step d) is polymerized or cured for 1 to 20 hours in the temperature range of 40° C. to 90° C.

15. A battery pack comprising the battery cell of claim 1 .

16. A device comprising the battery pack of claim 15 as a power supply.

17. The device of claim 16 , wherein:
the device a mobile phone, a tablet computer, a laptop computer, a power tool, a wearable electronic device, an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.

18. The battery cell of claim 4 , wherein:
the liquefied electrolyte solution component includes at least any one selected from the group consisting Li 3 N, LiI, Li 5 NI 2 , Li 3 N—LiI—LiOH, LiSiO 4 , LiSiO 4 —LiI—LiOH, Li 2 SiS 3 , Li 4 SiO 4 , Li 4 SiO 4 —LiI—LiOH, and Li 3 PO 4 —Li 2 S—SiS 2 .

19. The battery cell of claim 1 , wherein the plurality of pores include pores having an average diameter of greater than 10 μm to 100 μm.

20. The battery cell of claim 1 , wherein the gelation electrolyte solution component is entirely in the separator.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Ji Eun
• Jeong Hee Seok
• Oh Sei Woon
• Lee Eun Ju

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0585

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