Lithium secondary battery and method of manufacturing thereof
First Claim
1. A lithium secondary battery comprising:
- a winding-type electrode assembly;
a case accommodating the electrode assembly; and
ion-conductive polymer contained in at least one of an inner space defined by the electrode assembly and an inner space defined by the case other than the inner space of the electrode assembly, wherein the ion-conductive polymer comprises an ion-conductive polymer powder that is injected into the inner space of the electrode assembly and is gelled by injecting an electrolytic solution into the inner space of the electrode assembly and the inner space of the case to form the ion-conductive polymer.
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Abstract
A lithium secondary battery having a winding-type electrode assembly and a case accommodating the electrode assembly, and a method of manufacturing thereof. In the lithium secondary battery, ion-conductive polymer is contained in at least one of a hollow portion of the electrode assembly and an inner space of the case other than the hollow portion. The hollow portion and/or the inner space of the case of the electrode assembly is filled with ion-conductive polymer which can consume the heat generated in the battery and which is changed into a gel-state by an electrolytic solution, to dissipate the heat generated in the battery. Accordingly, the explosion of the battery can be suppressed, thereby preventing the reliability and safety of the battery from lowering.
29 Citations
19 Claims
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1. A lithium secondary battery comprising:
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a winding-type electrode assembly;
a case accommodating the electrode assembly; and
ion-conductive polymer contained in at least one of an inner space defined by the electrode assembly and an inner space defined by the case other than the inner space of the electrode assembly, wherein the ion-conductive polymer comprises an ion-conductive polymer powder that is injected into the inner space of the electrode assembly and is gelled by injecting an electrolytic solution into the inner space of the electrode assembly and the inner space of the case to form the ion-conductive polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
a cathode;
an anode; and
a separator separating the cathode and the anode;
wherein the cathode, the separator and the anode are in a jelly-roll type configuration.
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7. The lithium secondary battery according to claim 4, wherein the electrode assembly comprises:
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a cathode comprising a mixture nickel cobalt oxide, carbon black, vinylidenefluoride-hexafluoropropylene copolymer and a solvent coated on an aluminum foil;
an anode comprising a mixture of graphite powder, vinylidenefluoride-hexafluoropropylene copolymer and a solvent coated on a copper foil; and
a separator, separating the cathode and the anode, and made of polyethylene.
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8. The lithium secondary battery according to claim 5, wherein the electrode assembly comprises:
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a cathode comprising a mixture nickel cobalt oxide, carbon black, vinylidenefluoride-hexafluoropropylene copolymer and a solvent coated on an aluminum foil;
an anode comprising a mixture of graphite powder, vinylidenefluoride-hexafluoropropylene copolymer and a solvent coated on a copper foil; and
a separator, separating the cathode and the anode, and made of polyethylene.
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9. The lithium secondary battery of claim 3, wherein the LiPF6 is dissolved in the solvent of ethylene carbonate and dimethyl carbonate in a mixture ratio by weight of 1:
- 1.
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10. A lithium secondary battery comprising:
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an electrode assembly formed in a jelly-roll configuration;
a case accommodating the electrode assembly; and
a gel of ion-conductive polymer positioned in an inner space defined by the jelly-roll configuration of the electrode assembly, wherein the ion-conductive polymer comprises an ion-conductive polymer powder that is injected into the inner space of the electrode assembly and is gelled by injecting an electrolytic solution into the inner space of the electrode assembly and the inner space of the case to form the ion-conductive polymer.
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11. A method of manufacturing a lithium secondary battery comprising:
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winding an electrode assembly to have an inner space;
placing the electrode assembly in a cylindrical case;
injecting an ion-conductive polymer into at least one of the inner space defined by the electrode assembly and an inner space defined by the cylindrical case other than the inner space of the electrode assembly, wherein the injecting comprises;
injecting an ion-conductive polymer powder into the inner space of the electrode assembly, and injecting an electrolytic solution into the inner space of the electrode assembly and the inner space of the cylindrical case, wherein the electrolytic solution gels the ion-conductive polymer powder to form the ion-conductive polymer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
the winding of the electrode assembly comprises winding the electrode assembly around a mandrel; and
the placing of the electrode assembly comprises removing the mandrel to form the inner space of the electrode assembly after placing the electrode assembly in the cylindrical case.
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13. The method according to claim 11, wherein the ion-conductive polymer is at least one selected from the group consisting of polyether, polyethylene oxide, polypropylene oxide, polyacrylonitrile, polyvinylidene fluoride, polyvinylidene chloride, polymethyl methacrylate, polymethyl acrylate, polyvinyl alcohol, polymethacrylonitrile, polyvinyl acetate, polyvinylpyrrolidone, polyethyleneimine, polybutadiene, polystyrene, polyisoprene, vinylidene fluoride-hexafluoropropylene copolymer and derivatives of these polymers.
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14. The method according to claim 11, wherein the ion-conductive polymer is at least one selected from the group consisting of polyether, polyethylene oxide, polypropylene oxide, polyacrylonitrile, polyvinylidene fluoride, polyvinylidene chloride, polymethyl methacrylate, polymethyl acrylate, polyvinyl alcohol, polymethacrylonitrile, polyvinyl acetate, polyvinylpyrrolidone, polyethyleneimine, polybutadiene, polystyrene, polyisoprene, vinylidene fluoride-hexafluoropropylene copolymer and derivatives of these polymers.
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15. The method according to claim 14, wherein the electrolytic solution contains a lithium salt and an organic solvent, the organic solvent being at least one solvent selected from the group consisting of propylene carbonate, ethylene carbonate, γ
- -butyrolactone, 1,3-dioxolane, dimethoxyethane, dimethyl carbonate, methylethyl carbonate, diethyl carbonate, tetrahydrofuran, dimethyl sulfoxide and polyethylene glycol dimethyl ether, and the lithium salt being at least one selected from the group consisting of lithium perchlorate (LiClO4), lithium tetrafluoroborate (LiBF4), lithium hexafluorophosphate (LiPF6), lithium trifluoromethanesulfonate (LiCF3SO3) and lithium bistrifluoromethanesulfonyl amide (LiN(CF3SO2)2).
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16. The method according to claim 13, further comprising:
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mixing nickel cobalt oxide, carbon black, vinylidenefluoride-hexafluoropropylene copolymer and a solvent to produce a first mixture and coating the first mixture on an aluminum foil, to form the cathode;
mixing graphite powder, vinylidenefluoride-hexafluoropropylene copolymer and a solvent to form a second mixture, coating the second mixture on a copper foil, and drying rolling and cutting the resultant, to form the anode; and
interposing a polyethylene separator between the cathode and the anode.
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17. The method according to claim 14, further comprising:
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mixing nickel cobalt oxide, carbon black, vinylidenefluoride-hexafluoropropylene copolymer and a solvent to produce a first mixture and coating the first mixture on an aluminum foil, to form the cathode;
mixing graphite powder, vinylidenefluoride-hexafluoropropylene copolymer and a solvent to form a second mixture, coating the second mixture on a copper foil, and drying rolling and cutting the resultant, to form the anode; and
interposing a polyethylene separator between the cathode and the anode.
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18. The method according to claim 15, further comprising:
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mixing nickel cobalt oxide, carbon black, vinylidenefluoride-hexafluoropropylene copolymer and a solvent to produce a first mixture and coating the first mixture on an aluminum foil, to form the cathode;
mixing graphite powder, vinylidenefluoride-hexafluoropropylene copolymer and a solvent to form a second mixture, coating the second mixture on a copper foil, and drying rolling and cutting the resultant, to form the anode; and
interposing a polyethylene separator between the cathode and the anode.
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19. The method according to claim 15, further comprising dissolving the lithium salt LiPF6 in the solvent of ethylene carbonate and dimethyl carbonate in a mixture ratio by weight of 1:
- 1, to produce the electrolytic solution.
Specification