WO2023068905A1 - 전해액 첨가제, 이를 포함하는 리튬 이차전지용 전해액 및 리튬 이차전지 - Google Patents
전해액 첨가제, 이를 포함하는 리튬 이차전지용 전해액 및 리튬 이차전지 Download PDFInfo
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- WO2023068905A1 WO2023068905A1 PCT/KR2022/016249 KR2022016249W WO2023068905A1 WO 2023068905 A1 WO2023068905 A1 WO 2023068905A1 KR 2022016249 W KR2022016249 W KR 2022016249W WO 2023068905 A1 WO2023068905 A1 WO 2023068905A1
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- secondary battery
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- electrolyte solution
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- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
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- 229910000676 Si alloy Inorganic materials 0.000 description 1
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- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical group C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910008484 TiSi Inorganic materials 0.000 description 1
- QDDVNKWVBSLTMB-UHFFFAOYSA-N [Cu]=O.[Li] Chemical compound [Cu]=O.[Li] QDDVNKWVBSLTMB-UHFFFAOYSA-N 0.000 description 1
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 1
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- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 125000002178 anthracenyl group Chemical group C1(=CC=CC2=CC3=CC=CC=C3C=C12)* 0.000 description 1
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- 229910052796 boron Inorganic materials 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- VBWIZSYFQSOUFQ-UHFFFAOYSA-N cyclohexanecarbonitrile Chemical compound N#CC1CCCCC1 VBWIZSYFQSOUFQ-UHFFFAOYSA-N 0.000 description 1
- SVPZJHKVRMRREG-UHFFFAOYSA-N cyclopentanecarbonitrile Chemical compound N#CC1CCCC1 SVPZJHKVRMRREG-UHFFFAOYSA-N 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
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- TXCDCPKCNAJMEE-UHFFFAOYSA-N dibenzofuran Chemical group C1=CC=C2C3=CC=CC=C3OC2=C1 TXCDCPKCNAJMEE-UHFFFAOYSA-N 0.000 description 1
- IYYZUPMFVPLQIF-ALWQSETLSA-N dibenzothiophene Chemical group C1=CC=CC=2[34S]C3=C(C=21)C=CC=C3 IYYZUPMFVPLQIF-ALWQSETLSA-N 0.000 description 1
- OKVJWADVFPXWQD-UHFFFAOYSA-N difluoroborinic acid Chemical compound OB(F)F OKVJWADVFPXWQD-UHFFFAOYSA-N 0.000 description 1
- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 description 1
- POLCUAVZOMRGSN-UHFFFAOYSA-N dipropyl ether Chemical compound CCCOCCC POLCUAVZOMRGSN-UHFFFAOYSA-N 0.000 description 1
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- 238000000921 elemental analysis Methods 0.000 description 1
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- 229940093499 ethyl acetate Drugs 0.000 description 1
- QKBJDEGZZJWPJA-UHFFFAOYSA-N ethyl propyl carbonate Chemical compound [CH2]COC(=O)OCCC QKBJDEGZZJWPJA-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 125000003983 fluorenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3CC12)* 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical group FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- 229910003472 fullerene Inorganic materials 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
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- SDAXRHHPNYTELL-UHFFFAOYSA-N heptanenitrile Chemical compound CCCCCCC#N SDAXRHHPNYTELL-UHFFFAOYSA-N 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 125000002883 imidazolyl group Chemical group 0.000 description 1
- WUNJCKOTXFSWBK-UHFFFAOYSA-N indeno[2,1-a]carbazole Chemical group C1=CC=C2C=C3C4=NC5=CC=CC=C5C4=CC=C3C2=C1 WUNJCKOTXFSWBK-UHFFFAOYSA-N 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000000555 isopropenyl group Chemical group [H]\C([H])=C(\*)C([H])([H])[H] 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- CASZBAVUIZZLOB-UHFFFAOYSA-N lithium iron(2+) oxygen(2-) Chemical group [O-2].[Fe+2].[Li+] CASZBAVUIZZLOB-UHFFFAOYSA-N 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- QEXMICRJPVUPSN-UHFFFAOYSA-N lithium manganese(2+) oxygen(2-) Chemical class [O-2].[Mn+2].[Li+] QEXMICRJPVUPSN-UHFFFAOYSA-N 0.000 description 1
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 description 1
- IGILRSKEFZLPKG-UHFFFAOYSA-M lithium;difluorophosphinate Chemical compound [Li+].[O-]P(F)(F)=O IGILRSKEFZLPKG-UHFFFAOYSA-M 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- VROAXDSNYPAOBJ-UHFFFAOYSA-N lithium;oxido(oxo)nickel Chemical compound [Li+].[O-][Ni]=O VROAXDSNYPAOBJ-UHFFFAOYSA-N 0.000 description 1
- URIIGZKXFBNRAU-UHFFFAOYSA-N lithium;oxonickel Chemical compound [Li].[Ni]=O URIIGZKXFBNRAU-UHFFFAOYSA-N 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- VNKYTQGIUYNRMY-UHFFFAOYSA-N methoxypropane Chemical compound CCCOC VNKYTQGIUYNRMY-UHFFFAOYSA-N 0.000 description 1
- 229940017219 methyl propionate Drugs 0.000 description 1
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 1
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000003136 n-heptyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
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- 125000004306 triazinyl group Chemical group 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- ZMQDTYVODWKHNT-UHFFFAOYSA-N tris(2,2,2-trifluoroethyl) phosphate Chemical compound FC(F)(F)COP(=O)(OCC(F)(F)F)OCC(F)(F)F ZMQDTYVODWKHNT-UHFFFAOYSA-N 0.000 description 1
- CBIQXUBDNNXYJM-UHFFFAOYSA-N tris(2,2,2-trifluoroethyl) phosphite Chemical compound FC(F)(F)COP(OCC(F)(F)F)OCC(F)(F)F CBIQXUBDNNXYJM-UHFFFAOYSA-N 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0568—Liquid materials characterised by the solutes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to an electrolyte solution additive, an electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same.
- lithium secondary batteries are in the limelight as a driving power source for portable devices because they are lightweight and have high energy density. Accordingly, research and development efforts to improve the performance of lithium secondary batteries are being actively conducted.
- a lithium secondary battery is composed of a carbon material or silicon-based negative electrode capable of occluding and releasing lithium ions, a positive electrode made of a lithium-containing transition metal oxide, and a non-aqueous electrolyte. Charging and discharging is possible because it plays a role of transmitting energy while reciprocating between the two electrodes, such as being inserted into the electrode and detached again during discharge.
- the cathode active material is structurally collapsed, resulting in deterioration in the performance of the cathode.
- metal ions eluted from the surface of the anode are electrodeposited on the cathode, thereby deteriorating the anode. This deterioration in battery performance tends to be accelerated when the potential of the positive electrode increases or when the battery is exposed to high temperatures.
- the criterion for determining low voltage in the open circuit voltage (OCV) distribution after completion of the battery activation process is the normal voltage ⁇ 2 mV, and the open circuit voltage distribution shows a bimodal curve or a wide distribution. In this case, the battery is judged to be defective, causing a problem in that the yield is very low.
- the present invention relates to an electrolyte solution additive, an electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same.
- An exemplary embodiment of the present invention is a sultone-based compound; LiPO 2 F 2 ; And it provides an electrolyte solution additive comprising a compound represented by Formula 1 below.
- R1 is hydrogen; A substituted or unsubstituted alkyl group having 1 to 10 carbon atoms; or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms;
- L1 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms.
- An exemplary embodiment of the present invention is a lithium salt; organic solvents; And it provides an electrolyte solution for a lithium secondary battery comprising the electrolyte solution additive.
- An exemplary embodiment of the present invention provides a lithium secondary battery including the electrolyte solution for a lithium secondary battery.
- the electrolyte solution additive according to an exemplary embodiment of the present invention has an effect of increasing the yield of the battery by improving the open circuit voltage (OCV) distribution after completion of the activation process without degrading the performance and stability of the battery.
- OCV open circuit voltage
- substitution means that a hydrogen atom bonded to a carbon atom of a compound is replaced with another substituent, and the position to be substituted is not limited as long as the hydrogen atom is substituted, that is, a position where the substituent is substituted, and when two or more are substituted , Two or more substituents may be the same as or different from each other.
- substituted or unsubstituted means deuterium; halogen group; nitrile group (-CN); nitro group; hydroxy group; an alkyl group; aryl group; Or substituted with one or two or more substituents selected from the group consisting of heterocyclic groups, or substituted with substituents in which two or more substituents among the above exemplified substituents are connected, or without any substituents.
- a substituent in which two or more substituents are connected may be a biphenyl group. That is, the biphenyl group may be an aryl group or may be interpreted as a substituent in which two phenyl groups are connected.
- the alkyl group may be straight or branched, and the number of carbon atoms is not particularly limited, but is preferably 1 to 60. According to one embodiment, the number of carbon atoms of the alkyl group is 1 to 30. According to another embodiment, the number of carbon atoms of the alkyl group is 1 to 20. According to another exemplary embodiment, the number of carbon atoms of the alkyl group is 1 to 10.
- alkyl group examples include methyl group, ethyl group, propyl group, n-propyl group, isopropyl group, butyl group, n-butyl group, isobutyl group, tert-butyl group, pentyl group, n-pentyl group, hexyl group, n -Hexyl group, heptyl group, n-heptyl group, octyl group, n-octyl group, etc., but is not limited thereto.
- the alkenyl group may be linear or branched, and the number of carbon atoms is not particularly limited, but is preferably 2 to 40. According to one embodiment, the alkenyl group has 2 to 20 carbon atoms. According to another exemplary embodiment, the alkenyl group has 2 to 10 carbon atoms. According to another exemplary embodiment, the alkenyl group has 2 to 6 carbon atoms.
- Specific examples include vinyl, 1-propenyl, isopropenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 3-methyl-1- Butenyl, 1,3-butadienyl, allyl, 1-phenylvinyl-1-yl, 2-phenylvinyl-1-yl, 2,2-diphenylvinyl-1-yl, 2-phenyl-2-( naphthyl-1-yl)vinyl-1-yl, 2,2-bis(diphenyl-1-yl)vinyl-1-yl, styrenyl group, etc., but is not limited thereto.
- the alkynyl group is a substituent including a triple bond between carbon atoms and may be straight or branched, and the number of carbon atoms is not particularly limited, but is preferably 2 to 40. According to one embodiment, the number of carbon atoms of the alkynyl group is 2 to 20. According to another embodiment, the number of carbon atoms of the alkynyl group is 2 to 10.
- the aryl group is not particularly limited, but preferably has 6 to 60 carbon atoms, and may be a monocyclic aryl group or a polycyclic aryl group. According to one embodiment, the number of carbon atoms of the aryl group is 6 to 30. According to one embodiment, the number of carbon atoms of the aryl group is 6 to 20.
- the aryl group may be a phenyl group, a biphenyl group, a terphenyl group, a quaterphenyl group, etc. as a monocyclic aryl group, but is not limited thereto.
- the polycyclic aryl group may be a naphthyl group, anthracenyl group, phenanthrenyl group, pyrenyl group, perylenyl group, triphenylenyl group, chrysenyl group, fluorenyl group, triphenylenyl group, etc., but is limited thereto it is not going to be
- the heterocyclic group is a ring group containing one or more of N, O, P, S, Si and Se as heteroatoms, and the number of carbon atoms is not particularly limited, but preferably has 2 to 60 carbon atoms. According to one embodiment, the carbon number of the heterocyclic group is 2 to 30. According to one embodiment, the carbon number of the heterocyclic group is 2 to 20.
- heterocyclic group examples include a pyridine group, a pyrrole group, a pyrimidine group, a quinoline group, a pyridazinyl group, a furan group, a thiophene group, an imidazole group, a pyrazole group, a dibenzofuran group, a dibenzothiophene group, carba A sol group, a benzocarbazole group, a naphthobenzofuran group, a benzonaphthothiophene group, an indenocarbazole group, a triazinyl group, and the like, but are not limited thereto.
- alkyl group may be applied except that the alkylene group is divalent.
- alkenyl group may be applied except that the alkenylene group is divalent.
- An exemplary embodiment of the present invention is a sultone-based compound; LiPO 2 F 2 ; And it provides an electrolyte solution additive comprising a compound represented by Formula 1 below.
- R1 is hydrogen; A substituted or unsubstituted alkyl group having 1 to 10 carbon atoms; or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms;
- L1 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms.
- the criterion for judging the low voltage in the open circuit voltage (OCV) distribution after completion of the battery activation process is the normal voltage ⁇ 2 mV, and the open circuit voltage distribution shows a bimodal curve or a wide distribution In this case, the battery is determined to be defective, resulting in a very low yield.
- a battery using an electrolyte solution additive according to an exemplary embodiment of the present invention may contribute to yield improvement because the open circuit voltage distribution shows a very sharp shape after the activation process is completed.
- the film resistance of the negative electrode is too large, the OCV distribution widens after the first charge due to a deviation in the state of charge of the battery, so the OCV distribution widens after the final activation process.
- the film resistance of the negative electrode is too small, self-discharge deviation occurs during high-temperature aging, resulting in a large OCV distribution after high-temperature aging, and thus, a wide OCV distribution after a final activation process.
- the sultone-based compound increases the film resistance of the negative electrode, when only the sultone-based compound is applied to the electrolyte, the resistance of the battery becomes very large.
- the compound of Chemical Formula 1 is reduced before the sultone-based compound in the electrolyte, the effect of resistance by the sultone-based compound can be suppressed, but the resulting film has low ability to suppress reduction in the electrolyte. There is a problem that the self-discharge of the battery increases.
- the film resistance is too low and the OCV distribution increases after the battery activation process due to the variation in self-discharge, resulting in a decrease in yield.
- LiPO 2 F 2 forms a film well, but has insufficient self-discharge suppression properties and cannot suppress the effects of sultone-based compounds. Therefore, when only the sultone-based compound and LiPO 2 F 2 are used, the film resistance is too high and the OCV distribution also increases during battery charging, resulting in a wide OCV distribution even after the activation process, resulting in a decrease in yield.
- the electrolyte solution additive of the present invention including a sultone-based compound, LiPO 2 F 2 and the compound of Formula 1 is used at the same time, the optimum film resistance can be obtained, and the OCV distribution after the battery activation process becomes Sharp Therefore, the yield of the battery is also increased.
- the electrolyte solution additive includes a compound represented by Formula 1 below.
- R1 is hydrogen; A substituted or unsubstituted alkyl group having 1 to 10 carbon atoms; or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms;
- L1 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms.
- R1 is hydrogen; an alkyl group having 1 to 10 carbon atoms; or an aryl group having 6 to 30 carbon atoms.
- R1 is an alkyl group having 1 to 10 carbon atoms.
- R1 is an alkyl group having 1 to 5 carbon atoms.
- R1 is a methyl group; ethyl group; propyl group; butyl group; or a pentyl group.
- R1 is a methyl group.
- L1 is an alkylene group having 1 to 10 carbon atoms.
- L1 is an alkylene group having 1 to 5 carbon atoms.
- L1 is a methylene group; ethylene group; propylene group; butylene group; or a pentylene group.
- L1 is a methylene group.
- the compound represented by Formula 1 is methyl prop-2-yn-1-yl carbonate.
- the compound represented by Formula 1 is represented by the following compound.
- An electrolyte solution additive according to an exemplary embodiment of the present invention includes a sultone-based compound.
- the sultone-based compound may include a structure including a ring sulfonic acid ester (sulfonic ester). Specifically, it may include a compound represented by Formula 2 below.
- L2 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms; Or a substituted or unsubstituted alkenylene group having 2 to 10 carbon atoms,
- n 1 to 10;
- L2 is an alkylene group having 1 to 10 carbon atoms unsubstituted or substituted with an alkyl group having 1 to 10 carbon atoms; or an alkenylene group having 2 to 10 carbon atoms unsubstituted or substituted with an alkyl group having 1 to 10 carbon atoms.
- L2 is an ethylene group unsubstituted or substituted with a methyl group; A propylene group unsubstituted or substituted with a methyl group; A butylene group unsubstituted or substituted with a methyl group; A vinylene group unsubstituted or substituted with a methyl group; or a propenylene group unsubstituted or substituted with a methyl group.
- L2 is a methylene group; propylene group; vinylene group; or a propenylene group.
- n 1 to 3.
- the sultone-based compound is 1,3-propane sultone, 1,4-butane sultone, ethenesultone, 1-propene 1,3-sultone (1-propene 1,3-sultone), preferably 1,3-propane sultone, 1-propene 1,3-sultone or 1,3-propane sultone and 1-propene 1,3-sultone may be a mixture of
- the sultone-based compound may be at least one selected from the group consisting of 1,3-propane sultone and 1-propene 1,3-sultone.
- the 1,3-propane sultone is am.
- the 1-propene 1,3-sultone is am.
- the film resistance of the negative electrode tends to increase.
- An electrolyte solution additive according to an exemplary embodiment of the present invention includes LiPO 2 F 2 .
- the sultone-based compound may be included in an amount of 10 parts by weight to 50 parts by weight based on 100 parts by weight of the total electrolyte additive. In another exemplary embodiment, it may be included in 14 parts by weight to 46 parts by weight, or may be included in 25 parts by weight to 30 parts by weight.
- the content of the sultone-based compound is less than the above range, a sufficient film effect is not obtained, and side effects occur during high-temperature aging, resulting in an increase in OCV distribution.
- the content of the sultone-based compound exceeds the above range, there is a problem in that the OCV distribution increases due to an increase in interface resistance and a variation in state of charge during charging.
- the LiPO 2 F 2 may be included in an amount of 30 parts by weight to 80 parts by weight based on 100 parts by weight of the total electrolyte additive. In another exemplary embodiment, it may be included in 40 parts by weight to 75 parts by weight, or may be included in 55 parts by weight to 65 parts by weight.
- the LiPO 2 F 2 content is less than the above range, interface resistance cannot be sufficiently reduced, and there is a problem in that the OCV distribution increases due to variation in state of charge during charging.
- the LiPO 2 F 2 content exceeds the above range, the interfacial resistance becomes too small and side effects occur during high-temperature aging, resulting in a large OCV distribution.
- the compound represented by Formula 1 may be included in an amount of 1 to 30 parts by weight based on 100 parts by weight of the electrolyte additive. In another exemplary embodiment, it may be included in 3 parts by weight to 27 parts by weight, or may be included in 10 parts by weight to 12 parts by weight.
- the sultone-based compound forms a film preferentially over the compound represented by Formula 1, resulting in increased interfacial resistance and variation in charge state during charging, resulting in an OCV distribution. There is a growing problem.
- the weight ratio of the sultone-based compound and the compound represented by Formula 1 may be 1:9 to 9:1. Specifically, it may be 2:8 to 9:1, or 5:5 to 8:2. More specifically, it may be 7:3 to 8:2.
- the optimum film resistance can be obtained, and the yield of the battery is also increased because the OCV distribution is sharply improved after the battery activation process.
- the ratio of the sultone-based compound is too high, the interfacial resistance becomes too large, and if the ratio of the sultone-based compound is too low, self-discharge becomes too large during high-temperature aging.
- the weight ratio of the sultone-based compound and the LiPO 2 F 2 may be 1:9 to 9:1. Specifically, it may be 2:8 to 8:2, or 2:8 to 5:5. More specifically, it may be 3:7 to 4:6.
- the optimum film resistance can be obtained, and the yield of the battery is also increased because the OCV distribution is sharply improved after the battery activation process.
- An exemplary embodiment of the present invention is a lithium salt; organic solvents; And it provides an electrolyte solution for a lithium secondary battery comprising the above-described electrolyte solution additive.
- the lithium salt contained in the electrolyte solution those commonly used in electrolyte solutions for lithium secondary batteries may be used without limitation.
- the lithium salt includes Li + as a cation and F - , Cl - , Br as an anion.
- the lithium salt may be at least one selected from the group consisting of LiPF 6 and LiN(CF 3 SO 2 ) 2 (LiFSI).
- the lithium salt may be appropriately changed within a generally usable range, but may be included in a total concentration of 0.8 M to 2.0 M in the electrolyte solution in order to obtain an optimal effect of forming a film for preventing corrosion on the surface of the electrode.
- the organic solvent included in the electrolyte solution may include any one selected from the group consisting of ether-based solvents, ester-based solvents, and amide-based solvents, or a mixture of two or more selected from the group.
- the organic solvent is not limited thereto, and those commonly used in an electrolyte solution for a lithium secondary battery may be used without limitation.
- any one selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methyl propyl ether, and ethyl propyl ether, or a mixture of two or more thereof may be used. , but is not limited thereto.
- ester-based solvent may include at least one compound selected from the group consisting of a cyclic carbonate compound, a linear carbonate compound, a linear ester compound, and a cyclic ester compound.
- cyclic carbonate compound examples include ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, and 1,2-pentylene carbonate. , any one selected from the group consisting of 2,3-pentylene carbonate, vinylene carbonate and fluoroethylene carbonate (FEC), or a mixture of two or more thereof.
- linear carbonate compound examples include a group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethylmethyl carbonate (EMC), methylpropyl carbonate and ethylpropyl carbonate Any one selected from, or a mixture of two or more thereof may be used representatively, but is not limited thereto.
- the linear ester compound is any one or two selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, and butyl propionate Mixtures of the above may be used representatively, but are not limited thereto.
- cyclic ester compound examples include any one selected from the group consisting of ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -caprolactone, ⁇ -valerolactone, and ⁇ -caprolactone, or two or more of these compounds. Mixtures may be used, but are not limited thereto.
- the cyclic carbonate-based compound is a high-viscosity organic solvent and has a high dielectric constant, so it can be preferably used because it dissociates the lithium salt in the electrolyte well.
- an electrolyte solution having high electrical conductivity can be prepared and thus can be used more preferably.
- the organic solvent may include a carbonate compound.
- the organic solvent may be a mixture of ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC).
- EC ethylene carbonate
- EMC ethyl methyl carbonate
- DMC dimethyl carbonate
- the electrolyte solution for a lithium secondary battery may further include additional additives as needed.
- the additional additive is not particularly limited as long as it is an additive for forming an SEI film capable of forming a stable film on the surface of the anode and cathode.
- At least one additive selected from the group consisting of halogen-substituted carbonate-based compounds, nitrile-based compounds, cyclic carbonate-based compounds, phosphate-based compounds, borate-based compounds, cyclic sulfites, acyclic sulfones, and lithium salt-based compounds is further added.
- the halogen group-substituted carbonate-based compound may be fluoroethylene carbonate (FEC), and may include 5 parts by weight or less based on 100 parts by weight of the total electrolyte solution, specifically including 0.1 to 5 parts by weight can do.
- FEC fluoroethylene carbonate
- the content of the halogen-substituted carbonate-based compound exceeds 5 parts by weight, cell swelling performance may deteriorate.
- the nitrile-based compound is succinonitrile (SN), adiponitrile (Adn), acetonitrile, propionitrile, butyronitrile, valeronitrile, caprylonitrile, heptanenitrile, cyclopentane carbonitrile, cyclohexane Carbonitrile, 2-fluorobenzonitrile, 4-fluorobenzonitrile, difluorobenzonitrile, trifluorobenzonitrile, phenylacetonitrile, 2-fluorophenylacetonitrile, and 4-fluorophenylacetonitrile and at least one or more compounds selected from the group consisting of
- the nitrile-based compound when used together with the aforementioned additives, effects such as improvement in high-temperature characteristics can be expected by stabilizing the cathode/anode film. That is, it can serve as a supplement to form an anode SEI film, can play a role of suppressing the decomposition of the solvent in the electrolyte, and can play a role of improving the mobility of lithium ions.
- the nitrile-based compound may be included in an amount of 5 parts by weight or less based on 100 parts by weight of the total non-aqueous electrolyte, and specifically, 0.1 part by weight to 2 parts by weight. When the total content of the nitrile-based compound in the non-aqueous electrolyte exceeds the above range, resistance increases due to an increase in the film formed on the surface of the electrode, and battery performance may deteriorate.
- the cyclic carbonate-based compound forms a stable SEI film mainly on the surface of the negative electrode during battery activation, thereby improving battery durability.
- the cyclic carbonate-based compound may include vinylene carbonate (VC) or vinylethylene carbonate, and may be included in an amount of 5 parts by weight or less based on 100 parts by weight of the total non-aqueous electrolyte, specifically 0.1 part by weight to 5 parts by weight. can When the content of the cyclic carbonate-based compound in the non-aqueous electrolyte exceeds 5 parts by weight, cell swelling inhibition performance and initial resistance may deteriorate.
- phosphate-based compounds include lithium difluoro(bisoxalato)phosphate (LiDFOP), lithium difluorophosphate (LiDFP, LiPO 2 F 2 ,), tetramethyl trimethyl silyl phosphate (LiTFOP), and trimethyl silyl phosphite (TMSPi). ), at least one compound selected from the group consisting of tris (2,2,2-trifluoroethyl) phosphate (TFEPa) and tris (trifluoroethyl) phosphite (TFEPi). It may be included in 3 parts by weight or less based on parts by weight. Specifically, it may be included in 0.01 parts by weight or more and 3 parts by weight or less.
- the borate-based compound promotes the separation of ion pairs of lithium salts, can improve the mobility of lithium ions, can reduce the interfacial resistance of the SEI film, and materials such as LiF, which are generated during battery reactions and are not well separated By dissociation, problems such as generation of hydrofluoric acid gas can be solved.
- a borate-based compound may include lithium bioxalyl borate (LiBOB, LiB(C 2 O 4 ) 2 ), lithium oxalyl difluoroborate or tetramethyl trimethylsilyl borate (TMSB), based on 100 parts by weight of the total non-aqueous electrolyte. It may be included in 3 parts by weight or less. Specifically, it may be included in 0.01 parts by weight or more and 3 parts by weight or less.
- the lithium salt-based compound is a compound different from the lithium salt contained in the non-aqueous electrolyte, and may include one or more compounds selected from the group consisting of LiODFB and LiBF 4 , 3 parts by weight or less based on 100 parts by weight of the total non-aqueous electrolyte can be included with Specifically, it may be included in 0.01 parts by weight or more and 3 parts by weight or less.
- the additives for forming the SEI film may be used in combination of two or more, and may be included in an amount of 10 parts by weight or less, specifically 0.01 part by weight to 10 parts by weight, preferably 0.1 part by weight to 5.0 parts by weight, based on 100 parts by weight of the total electrolyte. there is.
- the content of the additional additive satisfies the above range, a more excellent film formation effect can be realized, and when it is 10 parts by weight or less, the capacity of the battery is reduced due to the side reaction of the surplus non-aqueous electrolyte additive, the viscosity of the electrolyte is increased, and thus Other resistance increase and ionic conductivity decrease phenomena can be prevented.
- the content of the additional additive exceeds 10 parts by weight, excessive side reactions in the electrolyte may occur during charging and discharging of the battery.
- the additive for forming the SEI film is added in an excessive amount, it may not be sufficiently decomposed and may remain unreacted or precipitated in the electrolyte solution at room temperature. Accordingly, resistance may increase, and life characteristics of the secondary battery may be deteriorated.
- the electrolyte solution for a lithium secondary battery may further include vinylene carbonate (VC), fluoroethylene carbonate (FEC), and succinonitrile (SN).
- VC vinylene carbonate
- FEC fluoroethylene carbonate
- SN succinonitrile
- the sultone-based compound is included in an amount of 0.1 part by weight to 5 parts by weight based on a total of 100 parts by weight of the electrolyte solution. Specifically, it may be included in 0.1 parts by weight to 2 parts by weight, may be included in 0.1 parts by weight to 1.5 parts by weight, or may be included in 0.2 parts by weight to 1 part by weight. More specifically, 0.4 parts by weight to 0.6 parts by weight may be included, or 0.5 parts by weight may be included. If the content of the S-containing additive, such as a sultone-based compound, is greater than the above range, interface resistance becomes too large, and if it is less than the above range, sufficient interface resistance cannot be obtained.
- the S-containing additive such as a sultone-based compound
- the LiPO 2 F 2 is included in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the total electrolyte. Specifically, it may be included in 0.3 parts by weight to 2 parts by weight, or may be included in 0.5 parts by weight to 2 parts by weight. More specifically, it may be included in 0.5 parts by weight to 1.2 parts by weight, may be included in 1 part by weight to 1.2 parts by weight, or may be included in 1 part by weight. If the content of LiPO 2 F 2 is less than the above range, it is difficult to sufficiently reduce the interface resistance, and if it is more than the above range, it is difficult to express the effect itself because it is not dissolved well even if it is contained in the electrolyte.
- the compound represented by Formula 1 is included in an amount of 0.01 part by weight to 3 parts by weight based on a total of 100 parts by weight of the electrolyte. Specifically, 0.05 parts by weight to 1 part by weight may be included, or 0.05 parts by weight to 0.5 parts by weight may be included. More specifically, 0.1 parts by weight to 0.5 parts by weight may be included, or 0.2 parts by weight may be included. If the content of the compound represented by Formula 1 is less than the above range, the effect of suppressing excessive film formation of the sultone-based compound cannot be obtained, and if it is more than the above range, a large amount of reduction and decomposition gas is generated during the first charge, reducing the internal pressure of the battery. There is a problem with increasing
- the sultone-based compound LiPO 2 F 2 ;
- the compound represented by Formula 1 satisfies all of the above content ranges, optimal film resistance can be obtained, and the OCV distribution after the battery activation process is sharply improved, so the yield of the battery can be improved. there is.
- An exemplary embodiment of the present invention provides a lithium secondary battery including the electrolyte solution for a lithium secondary battery.
- the secondary battery may include a negative electrode, a positive electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte solution, and includes the electrolyte solution for a lithium secondary battery of the present invention as the electrolyte solution.
- the lithium secondary battery of the present invention can be manufactured by injecting the non-aqueous electrolyte of the present invention into an electrode structure composed of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode.
- an electrode structure composed of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode.
- the positive electrode, the negative electrode, and the separator forming the electrode structure those commonly used in manufacturing a lithium secondary battery may all be used.
- the lithium secondary battery including the lithium secondary battery electrolyte may include a P-based, carbonate-based, and S-based mixed SEI film, which can be confirmed through elemental analysis using XPS .
- the positive electrode may include a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector and including the positive electrode active material.
- the positive electrode may be formed by coating a positive electrode slurry including a positive electrode active material, a positive electrode binder, a positive electrode conductive material, and a solvent on a positive electrode current collector, followed by drying and rolling.
- the positive electrode current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery.
- stainless steel, aluminum, nickel, titanium, fired carbon, or carbon on the surface of aluminum or stainless steel. , those surface-treated with nickel, titanium, silver, etc. may be used.
- the cathode current collector may have a thickness of typically 3 to 500 ⁇ m, and adhesion of the cathode active material may be increased by forming fine irregularities on the surface of the current collector.
- it may be used in various forms such as films, sheets, foils, nets, porous materials, foams, and non-woven fabrics.
- the cathode active material may be a commonly used cathode active material.
- the cathode active material may include layered compounds such as lithium cobalt oxide (LiCoO 2 ) and lithium nickel oxide (LiNiO 2 ), or compounds substituted with one or more transition metals; lithium iron oxides such as LiFe 3 O 4 ; lithium manganese oxides such as Li 1+c1 Mn 2-c1 O 4 (0 ⁇ c1 ⁇ 0.33), LiMnO 3 , LiMn 2 O 3 , LiMnO 2 ; lithium copper oxide (Li 2 CuO 2 ); vanadium oxides such as LiV 3 O 8 , V 2 O 5 , and Cu 2 V 2 O 7 ; Formula LiNi 1-c2 M c2 O 2 (where M is at least one selected from the group consisting of Co, Mn, Al, Cu, Fe, Mg, B, and Ga, and satisfies 0.01 ⁇ c2 ⁇ 0.3) Ni site-type lithium nickel oxide; Formula LiMn 2-c3
- the positive electrode active material layer may include a positive electrode conductive material and a positive electrode binder together with the positive electrode active material described above.
- the positive electrode conductive material is used to impart conductivity to the electrode, and in the configured battery, any material that does not cause chemical change and has electronic conductivity can be used without particular limitation.
- any material that does not cause chemical change and has electronic conductivity can be used without particular limitation.
- Specific examples include graphite such as natural graphite or artificial graphite; carbon-based materials such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, summer black, and carbon fiber; metal powders or metal fibers such as copper, nickel, aluminum, and silver; conductive whiskeys such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; or conductive polymers such as polyphenylene derivatives, and the like, and one of them alone or a mixture of two or more may be used.
- the positive electrode binder serves to improve adhesion between particles of the positive electrode active material and adhesion between the positive electrode active material and the positive electrode current collector.
- specific examples include polyvinylidene fluoride (PVDF), vinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HFP), polyvinyl alcohol, polyacrylonitrile, carboxymethylcellulose (CMC) ), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene polymer (EPDM), sulfonated-EPDM, styrene butadiene rubber (SBR), fluororubber, or various copolymers thereof, and the like, and one type alone or a mixture of two or more types thereof may be used.
- PVDF polyvinylidene fluoride
- PVDF-co-HFP vinylidene flu
- the solvent may include an organic solvent such as NMP (N-methyl-2-pyrrolidone), and may be used in an amount that provides a desired viscosity when the cathode active material and optionally a binder and a conductive material are included.
- NMP N-methyl-2-pyrrolidone
- the slurry containing the cathode active material and, optionally, the binder and the conductive material may have a solid concentration of 50 wt% to 95 wt%, preferably 70 wt% to 90 wt%.
- the negative electrode may include a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector and including the negative electrode active material.
- the anode may be formed by coating an anode slurry including a cathode active material, an anode binder, an anode conductive material, and a solvent on an anode current collector, followed by drying and rolling.
- the negative current collector generally has a thickness of 3 to 500 ⁇ m.
- the negative electrode current collector is not particularly limited as long as it does not cause chemical change in the battery and has high conductivity.
- it is made of copper, stainless steel, aluminum, nickel, titanium, fired carbon, copper or stainless steel.
- a surface treated with carbon, nickel, titanium, silver, or the like, an aluminum-cadmium alloy, or the like may be used.
- fine irregularities may be formed on the surface to enhance the bonding strength of the negative electrode active material, and may be used in various forms such as films, sheets, foils, nets, porous bodies, foams, and nonwoven fabrics.
- a compound capable of reversible intercalation and deintercalation may be used as the anode active material.
- Specific examples include carbon-based active materials, silicon-based active materials, metal-based active materials capable of alloying with lithium; and a single material selected from the group consisting of lithium-containing nitrides or a mixture of two or more thereof.
- carbon-based active material examples include natural graphite, artificial graphite, expanded graphite, carbon fiber, non-graphitizable carbon, carbon black, carbon nanotube, fullerene, or activated carbon, and are commonly used in carbon materials for lithium secondary batteries. Anything can be used without limitation.
- silicon-based active material examples include silicon, silicon alloys, SiB 4 , SiB 6 , Mg 2 Si, Ni 2 Si, TiSi 2 , MoSi 2 , CoSi 2 , NiSi 2 , CaSi 2 , CrSi 2 , Cu 5 Si, In the group consisting of FeSi 2 , MnSi 2 , NbSi 2 , TaSi 2 , VSi 2 , WSi 2 , ZnSi 2 , SiC, Si 3 N 4 , Si 2 N 2 O, SiO v (0.5 ⁇ v ⁇ 1.2), and LiSiO One or more selected ones are exemplified.
- the metal-based active material include Al, Sn, Ag, Bi, Mg, Zn, In, Ge, Pb, Pd, Pt, Ti, Sb, Ga, Mn, Fe, Co, Ni, Cu, Sr, and Ba. It may be a compound containing any one or two or more metal elements selected from the group consisting of. These metal compounds can be used in any form, such as simple elements, alloys, oxides (TiO 2 , SnO 2 , etc.), nitrides, sulfides, borides, and alloys with lithium. It can be.
- a lithium secondary battery having improved overall performance such as cycle life characteristics can be manufactured. That is, in the case of a silicon-based active material, the stability of the SEI is greatly reduced because the volume change is large during charging and discharging.
- the non-aqueous electrolyte containing the additive of the present invention when used, the LiF content in the non-aqueous electrolyte increases and a rich SEI film that can compensate for the disadvantages of the silicon-based active material can be formed. The effect of improving the lifespan of the secondary battery using the is more significant.
- the anode active material layer may include an anode conductive material and an anode binder together with the anode active material described above.
- the anode binder is a component that assists in bonding between the conductive material, the active material, and the current collector, and is typically added in an amount of 1 to 30% by weight based on the total weight of the solid content in the anode slurry.
- binders are polyvinylidene fluoride (PVDF), polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, polytetra and fluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene polymer (EPDM), sulfonated-EPDM, styrene-butadiene rubber, fluororubber, and various copolymers thereof.
- PVDF polyvinylidene fluoride
- CMC carboxymethylcellulose
- EPDM ethylene-propylene-diene polymer
- sulfonated-EPDM styrene-butadiene rubber
- the anode conductive material is a component for further improving the conductivity of the anode active material, and may be added in an amount of 1 to 20% by weight based on the total weight of solids in the anode slurry.
- a conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery, and examples thereof include graphite such as natural graphite or artificial graphite; carbon black such as acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fibers and metal fibers; metal powders such as carbon fluoride, aluminum, and nickel powder; conductive whiskeys such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives may be used.
- the solvent may include water or an organic solvent such as NMP or alcohol, and may be used in an amount that has a desired viscosity when the negative electrode active material and optionally a binder and a conductive material are included.
- the slurry containing the negative electrode active material and, optionally, the binder and the conductive material may have a solid concentration of 50 wt% to 95 wt%, preferably 70 wt% to 90 wt%.
- the separator separates the negative electrode and the positive electrode and provides a passage for lithium ion movement. If it is normally used as a separator in a secondary battery, it can be used without particular limitation. It is desirable Specifically, a porous polymer film, for example, a porous polymer film made of polyolefin-based polymers such as ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, and ethylene/methacrylate copolymer, or these A laminated structure of two or more layers of may be used.
- a porous polymer film for example, a porous polymer film made of polyolefin-based polymers such as ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, and ethylene/methacrylate copolymer, or these A laminated structure of two or more layers of may be used.
- porous non-woven fabrics for example, non-woven fabrics made of high melting point glass fibers, polyethylene terephthalate fibers, and the like may be used.
- a coated separator containing a ceramic component or a polymer material may be used to secure heat resistance or mechanical strength, and may be selectively used in a single-layer or multi-layer structure.
- the lithium secondary battery may be a cylindrical battery.
- the cylindrical battery may be a 18650 battery or a 21700 battery.
- a battery module including the lithium secondary battery as a unit cell and a battery pack including the same are provided. Since the battery module and the battery pack include the secondary battery having high capacity, high rate and cycle characteristics, a medium or large-sized device selected from the group consisting of an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage system can be used as a power source for
- a cathode active material Li(Ni 0.5 Mn 0.3 Co 0.2 )O 2
- a conductive material carbon black
- a binder polyvinylidene fluoride; PVDF
- NMP N-methyl-2-pyrrolidone
- a positive electrode slurry was prepared by adding it in a weight ratio of 95.05:2.15:2.80.
- the positive electrode slurry was applied to an aluminum (Al) thin film having a thickness of about 15 ⁇ m, which is a positive electrode current collector, dried, and then rolled using a roll press to prepare a positive electrode.
- An anode slurry was prepared by adding an anode active material (graphite), a conductive material (carbon black), a binder (styrene butadiene rubber; SBR), and CMC (carboxymethylcellulose) in a weight ratio of 97.0:1.2:0.8:1.0 to H 2 O as a solvent. manufactured.
- the negative electrode slurry was applied to a copper (Cu) thin film as a negative electrode current collector having a thickness of 15 ⁇ m, dried, and then rolled using a roll press to prepare a negative electrode.
- Cu copper
- An electrode assembly was prepared by sequentially stacking the positive electrode, the negative electrode, and a separator made of Al 2 O 3 coated PE.
- a lithium secondary battery was manufactured by injecting an electrolyte solution into the case.
- a lithium secondary battery was manufactured in the same manner as in Example 1, except that 0.05 g of methyl prop-2-yn-1-yl carbonate was added to 93.95 g of the non-aqueous organic solvent.
- a lithium secondary battery was manufactured in the same manner as in Example 1, except that 0.5 g of methyl prop-2-yn-1-yl carbonate was added to 93.5 g of the non-aqueous organic solvent.
- a lithium secondary battery was manufactured in the same manner as in Example 1, except that 0.2 g of 1,3-propanesultone was added to 94.1 g of the non-aqueous organic solvent.
- a lithium secondary battery was manufactured in the same manner as in Example 1, except that 1 g of 1,3-propanesultone was added to 93.3 g of the non-aqueous organic solvent.
- a lithium secondary battery was manufactured in the same manner as in Example 1, except that 0.5 g of LiPO 2 F 2 was added to 94.3 g of the non-aqueous organic solvent.
- a lithium secondary battery was manufactured in the same manner as in Example 1, except that 1.2 g of LiPO 2 F 2 was added to 93.6 g of the non-aqueous organic solvent.
- a lithium secondary battery was manufactured in the same manner as in Example 1, except that 0.5 g of 1-propene 1,3-sultone (PRS) was added to 93.8 g of the non-aqueous organic solvent instead of 1,3-propanesultone.
- PRS 1-propene 1,3-sultone
- a lithium secondary battery was manufactured in the same manner as in Example 1, except that a non-aqueous organic solvent dissolved in 0.8M of LiPF 6 and 0.7M of LiFSI was used instead of 1.5M of LiPF 6 .
- a non-aqueous organic solvent ethylene carbonate (EC): ethyl methyl carbonate (EMC): dimethyl carbonate (DMC) mixed in a volume ratio of 20: 20: 60
- LiPF 6 was dissolved to a concentration of 1.5 M
- vinylene carbonate A lithium secondary battery was prepared in the same manner as in Example 1, except that a non-aqueous electrolyte was prepared by adding 2 g of VC) and 2 g of fluoroethylene carbonate (FEC).
- a lithium secondary battery was manufactured in the same manner as in Comparative Example 1, except that 1 g of LiPO 2 F 2 was additionally added to 95 g of the non-aqueous organic solvent.
- a lithium secondary battery was manufactured in the same manner as in Comparative Example 1, except that 1 g of LiPO 2 F 2 and 0.5 g of succinonitrile were additionally added to 94.5 g of the non-aqueous organic solvent.
- Lithium was prepared in the same manner as in Comparative Example 1, except that 0.2 g of methyl prop-2-yn-1-yl carbonate, 1 g of LiPO 2 F 2 , and 0.5 g of succinonitrile were additionally added to 94.3 g of the non-aqueous organic solvent. A secondary battery was manufactured.
- a lithium secondary battery was prepared in the same manner as in Comparative Example 1, except that 0.5 g of 1,3-propanesultone, 1 g of LiPO 2 F 2 , and 0.5 g of succinonitrile were additionally added to 94 g of the non-aqueous organic solvent.
- composition of the electrolyte solution of the secondary battery prepared in the above Examples and Comparative Examples is shown in Table 1 below.
- LiFSI Lithium bis(trifluoromethanesulfonyl)imide
- FEC fluoroethylene carbonate
- the lithium secondary batteries prepared in Examples 1 to 9 and Comparative Examples 1 to 6 were percharged at 0.3 C to an SOC of 0.8%, and then subjected to high-temperature aging at 60 °C for 1 day. After that, the first charge (0.2 C, SOC 80%), high temperature (60 ° C, 24 hr) and room temperature (12 hr) aging were followed by CC discharge (2 steps, 1.5C 2.5V/0.2C 2.5V). Finally, the activation process was carried out through the process of shipment charging (CCCV 1C, 3.61V 100mA cut-off).
- OCV open circuit voltage
- FIGS. 10 to 15 show OCV distributions of Comparative Examples 1 to 6, respectively.
- n Frequency of OCV occurrence after cell activation
- the battery using the electrolyte solution additive of the present invention shows a very sharp OCV distribution after completion of the activation process.
- the battery using the electrolyte solution additive according to an exemplary embodiment of the present invention shows a very sharp distribution of OCV after completion of the activation process, it can contribute to improving the yield of the battery.
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Abstract
Description
리튬염(M) | 유기 용매(vol%) | 전해액 첨가제(wt%) | 추가 첨가제(wt%) | |||||||||
LiPF6 | LiFSI | EC | EMC | DMC | PS | PRS | Ky01 | LiPO2F2 | VC | FEC | SN | |
실시예 1 | 1.5 | 0 | 20 | 20 | 60 | 0.5 | - | 0.2 | 1 | 2 | 2 | 0.5 |
실시예 2 | 1.5 | 0 | 20 | 20 | 60 | 0.5 | - | 0.05 | 1 | 2 | 2 | 0.5 |
실시예 3 | 1.5 | 0 | 20 | 20 | 60 | 0.5 | - | 0.5 | 1 | 2 | 2 | 0.5 |
실시예 4 | 1.5 | 0 | 20 | 20 | 60 | 0.2 | - | 0.2 | 1 | 2 | 2 | 0.5 |
실시예 5 | 1.5 | 0 | 20 | 20 | 60 | 1 | - | 0.2 | 1 | 2 | 2 | 0.5 |
실시예 6 | 1.5 | 0 | 20 | 20 | 60 | 0.5 | - | 0.2 | 0.5 | 2 | 2 | 0.5 |
실시예 7 | 1.5 | 0 | 20 | 20 | 60 | 0.5 | - | 0.2 | 1.2 | 2 | 2 | 0.5 |
실시예 8 | 1.5 | 0 | 20 | 20 | 60 | - | 0.5 | 0.2 | 1 | 2 | 2 | 0.5 |
실시예 9 | 0.8 | 0.7 | 20 | 20 | 60 | 0.5 | - | 0.2 | 1 | 2 | 2 | 0.5 |
비교예 1 | 1.5 | 0 | 20 | 20 | 60 | - | - | - | - | 2 | 2 | - |
비교예 2 | 1.5 | 0 | 20 | 20 | 60 | - | - | - | 1 | 2 | 2 | - |
비교예 3 | 1.5 | 0 | 20 | 20 | 60 | - | - | - | 1 | 2 | 2 | 0.5 |
비교예 4 | 1.5 | 0 | 20 | 20 | 60 | - | - | 0.2 | 1 | 2 | 2 | 0.5 |
비교예 5 | 1.5 | 0 | 20 | 20 | 60 | 0.5 | - | - | 1 | 2 | 2 | 0.5 |
비교예 6 | 1.5 | 0 | 20 | 20 | 60 | 0.5 | - | 0.2 | - | 2 | 2 | 0.5 |
n | Ave.(mV) | Max(mV) | min(mV) | 3σ (mV) | |
실시예 1 | 45 | 3602 | 3602 | 3602 | 0 |
실시예 2 | 22 | 3598 | 3599 | 3596 | 2 |
실시예 3 | 23 | 3604 | 3605 | 3603 | 1 |
실시예 4 | 30 | 3605 | 3606 | 3603 | 2 |
실시예 5 | 36 | 3596 | 3598 | 3594 | 2 |
실시예 6 | 27 | 3602 | 3604 | 3602 | 1 |
실시예 7 | 29 | 3601 | 3601 | 3601 | 0 |
실시예 8 | 38 | 3602 | 3602 | 3602 | 0 |
실시예 9 | 35 | 3601 | 3603 | 3601 | 1 |
비교예 1 | 54 | 3605 | 3607 | 3604 | 3 |
비교예 2 | 54 | 3605 | 3607 | 3603 | 6 |
비교예 3 | 51 | 3605 | 3607 | 3603 | 4 |
비교예 4 | 54 | 3605 | 3606 | 3603 | 4 |
비교예 5 | 42 | 3604 | 3606 | 3601 | 5 |
비교예 6 | 35 | 3602 | 3604 | 3601 | 3 |
Claims (14)
- 청구항 1에 있어서,상기 R1은 탄소수 1 내지 10의 알킬기인 것인 전해액 첨가제.
- 청구항 1에 있어서,상기 L1은 탄소수 1 내지 5의 알킬렌기인 것인 전해액 첨가제.
- 청구항 1에 있어서,상기 설톤계 화합물 및 상기 화학식 1로 표시되는 화합물의 중량비(설톤계 화합물:화학식 1로 표시되는 화합물)는 5:5 내지 8:2로 포함되는 것인 전해액 첨가제.
- 청구항 1에 있어서,상기 설톤계 화합물은 1,3-프로판설톤; 및 1-프로펜 1,3-설톤으로 이루어진 군에서 선택된 1 이상이고,상기 화학식 1로 표시되는 화합물은 메틸 프로프-2-인-1-일 카보네이트(methyl prop-2-yn-1-yl carbonate)인 것인 전해액 첨가제.
- 리튬염; 유기 용매; 및 청구항 1 내지 5 중 어느 한 항에 따른 전해액 첨가제를 포함하는 리튬 이차전지용 전해액.
- 청구항 6에 있어서,상기 설톤계 화합물은 상기 전해액 총 100 중량부를 기준으로 0.1 중량부 내지 5 중량부로 포함되는 것인 리튬 이차전지용 전해액.
- 청구항 6에 있어서,상기 LiPO2F2는 상기 전해액 총 100 중량부를 기준으로 0.1 중량부 내지 2 중량부로 포함되는 것인 리튬 이차전지용 전해액.
- 청구항 6에 있어서,상기 화학식 1로 표시되는 화합물은 상기 전해액 총 100 중량부를 기준으로 0.01 중량부 내지 3 중량부로 포함되는 것인 리튬 이차전지용 전해액.
- 청구항 6에 있어서,상기 리튬염은 양이온으로 Li+를 포함하고,음이온으로 F-, Cl-, Br-, I-, NO3 -, N(CN)2 -, BF4 -, ClO4 -, AlO4 -, AlCl4 -, PF6 -, SbF6 -, AsF6 -, BF2C2O4 -, BC4O8 -, (CF3)2PF4 -, (CF3)3PF3 -, (CF3)4PF2 -, (CF3)5PF-, (CF3)6P-, CF3SO3 -, C4F9SO3 -, CF3CF2SO3 -, (CF3SO2)2N-, (FSO2)2N-, CF3CF2(CF3)2CO-, (CF3SO2)2CH-, CF3(CF2)7SO3 -, CF3CO2 -, CH3CO2 -, SCN- 및 (CF3CF2SO2)2N-로 이루어진 군으로부터 선택된 1종 이상을 포함하는 것인 리튬 이차전지용 전해액.
- 청구항 6에 있어서,상기 유기 용매는 에테르계 용매, 에스테르계 용매 및 아미드계 용매로 이루어진 군에서 선택된 1종 또는 상기 군에서 선택된 2종 이상의 혼합물을 포함하는 것인 리튬 이차전지용 전해액.
- 청구항 6에 있어서,상기 전해액은 할로겐기가 치환된 카보네이트계 화합물, 니트릴계 화합물, 환형 카보네이트계 화합물, 포스페이트계 화합물, 보레이트계 화합물, 환형 설파이트, 비환형 설폰 및 리튬염계 화합물로 이루어진 군으로부터 선택된 1종 이상의 첨가제를 더 포함하는 것인 리튬 이차전지용 전해액.
- 청구항 6에 따른 리튬 이차전지용 전해액을 포함하는 리튬 이차전지.
- 청구항 13에 있어서, 상기 리튬 이차전지는 원통형 전지인 것인 리튬 이차전지.
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JP5835514B1 (ja) * | 2015-05-27 | 2015-12-24 | 宇部興産株式会社 | リチウム塩化合物、並びにそれを用いた非水電解液、リチウムイオン二次電池、及びリチウムイオンキャパシタ |
KR20190033448A (ko) * | 2017-09-21 | 2019-03-29 | 주식회사 엘지화학 | 리튬 이차전지용 비수전해액 및 이를 포함하는 리튬 이차전지 |
KR20200092889A (ko) * | 2019-01-25 | 2020-08-04 | 주식회사 엘지화학 | 리튬 이차 전지용 전해질 및 이를 포함하는 리튬 이차 전지 |
US20210036366A1 (en) * | 2018-04-18 | 2021-02-04 | Guangzhou Tinci Materials Technology Co., Ltd. | Lithium secondary battery electrolyte and lithium secondary battery thereof |
US20210313611A1 (en) * | 2019-02-04 | 2021-10-07 | South 8 Technologies, Inc. | Method of Electrochemical Energy Storage Device Construction |
KR20210142005A (ko) | 2019-03-20 | 2021-11-23 | 봅스트 맥스 에스에이 | 레이저 라인을 사용하는 멀티-카메라 이미징 시스템 |
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JP5835514B1 (ja) * | 2015-05-27 | 2015-12-24 | 宇部興産株式会社 | リチウム塩化合物、並びにそれを用いた非水電解液、リチウムイオン二次電池、及びリチウムイオンキャパシタ |
KR20190033448A (ko) * | 2017-09-21 | 2019-03-29 | 주식회사 엘지화학 | 리튬 이차전지용 비수전해액 및 이를 포함하는 리튬 이차전지 |
US20210036366A1 (en) * | 2018-04-18 | 2021-02-04 | Guangzhou Tinci Materials Technology Co., Ltd. | Lithium secondary battery electrolyte and lithium secondary battery thereof |
KR20200092889A (ko) * | 2019-01-25 | 2020-08-04 | 주식회사 엘지화학 | 리튬 이차 전지용 전해질 및 이를 포함하는 리튬 이차 전지 |
US20210313611A1 (en) * | 2019-02-04 | 2021-10-07 | South 8 Technologies, Inc. | Method of Electrochemical Energy Storage Device Construction |
KR20210142005A (ko) | 2019-03-20 | 2021-11-23 | 봅스트 맥스 에스에이 | 레이저 라인을 사용하는 멀티-카메라 이미징 시스템 |
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