WO2022270812A1 - 전지용 전해액 및 이를 포함하는 이차전지 - Google Patents
전지용 전해액 및 이를 포함하는 이차전지 Download PDFInfo
- Publication number
- WO2022270812A1 WO2022270812A1 PCT/KR2022/008448 KR2022008448W WO2022270812A1 WO 2022270812 A1 WO2022270812 A1 WO 2022270812A1 KR 2022008448 W KR2022008448 W KR 2022008448W WO 2022270812 A1 WO2022270812 A1 WO 2022270812A1
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- WO
- WIPO (PCT)
- Prior art keywords
- battery
- electrolyte solution
- compound
- carbonate
- secondary battery
- Prior art date
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 27
- 230000014759 maintenance of location Effects 0.000 claims abstract description 13
- 239000008151 electrolyte solution Substances 0.000 claims description 53
- 150000001875 compounds Chemical class 0.000 claims description 42
- 238000011084 recovery Methods 0.000 claims description 39
- -1 sulfate compound Chemical class 0.000 claims description 36
- 238000003860 storage Methods 0.000 claims description 28
- 229910052744 lithium Inorganic materials 0.000 claims description 20
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 19
- 239000003960 organic solvent Substances 0.000 claims description 19
- 239000000654 additive Substances 0.000 claims description 15
- 230000000996 additive effect Effects 0.000 claims description 15
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 13
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 13
- 150000002898 organic sulfur compounds Chemical class 0.000 claims description 13
- 159000000002 lithium salts Chemical class 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 229910003002 lithium salt Inorganic materials 0.000 claims description 11
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 10
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 10
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 8
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 8
- 229910013870 LiPF 6 Inorganic materials 0.000 claims description 7
- 125000000217 alkyl group Chemical group 0.000 claims description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims description 7
- 229910052731 fluorine Inorganic materials 0.000 claims description 7
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 6
- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011737 fluorine Substances 0.000 claims description 6
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 6
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 6
- ZPFAVCIQZKRBGF-UHFFFAOYSA-N 1,3,2-dioxathiolane 2,2-dioxide Chemical compound O=S1(=O)OCCO1 ZPFAVCIQZKRBGF-UHFFFAOYSA-N 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000004146 energy storage Methods 0.000 claims description 4
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 claims description 3
- OQYOVYWFXHQYOP-UHFFFAOYSA-N 1,3,2-dioxathiane 2,2-dioxide Chemical compound O=S1(=O)OCCCO1 OQYOVYWFXHQYOP-UHFFFAOYSA-N 0.000 claims description 3
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 3
- DSMUTQTWFHVVGQ-UHFFFAOYSA-N 4,5-difluoro-1,3-dioxolan-2-one Chemical compound FC1OC(=O)OC1F DSMUTQTWFHVVGQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910010238 LiAlCl 4 Inorganic materials 0.000 claims description 3
- 229910015015 LiAsF 6 Inorganic materials 0.000 claims description 3
- 229910015044 LiB Inorganic materials 0.000 claims description 3
- 229910013063 LiBF 4 Inorganic materials 0.000 claims description 3
- 229910013684 LiClO 4 Inorganic materials 0.000 claims description 3
- 229910012513 LiSbF 6 Inorganic materials 0.000 claims description 3
- QKBJDEGZZJWPJA-UHFFFAOYSA-N ethyl propyl carbonate Chemical compound [CH2]COC(=O)OCCC QKBJDEGZZJWPJA-UHFFFAOYSA-N 0.000 claims description 3
- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Inorganic materials [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 claims description 3
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 claims description 3
- 125000001153 fluoro group Chemical group F* 0.000 claims description 2
- 125000005843 halogen group Chemical group 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 14
- 239000002000 Electrolyte additive Substances 0.000 abstract description 9
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 238000007599 discharging Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
- 229910001416 lithium ion Inorganic materials 0.000 description 9
- 102100028667 C-type lectin domain family 4 member A Human genes 0.000 description 8
- 101000766908 Homo sapiens C-type lectin domain family 4 member A Proteins 0.000 description 8
- 150000002367 halogens Chemical group 0.000 description 8
- 239000006182 cathode active material Substances 0.000 description 6
- 239000010408 film Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000012046 mixed solvent Substances 0.000 description 6
- 239000007773 negative electrode material Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000009830 intercalation Methods 0.000 description 4
- 230000002687 intercalation Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910006176 NixCo Inorganic materials 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910003481 amorphous carbon Inorganic materials 0.000 description 2
- 239000006183 anode active material Substances 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000009831 deintercalation Methods 0.000 description 2
- 125000001028 difluoromethyl group Chemical group [H]C(F)(F)* 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 2
- KLLQVNFCMHPYGL-UHFFFAOYSA-N 5h-oxathiole 2,2-dioxide Chemical compound O=S1(=O)OCC=C1 KLLQVNFCMHPYGL-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 101150097504 LHX1 gene Proteins 0.000 description 1
- 229910002999 Li(Ni0.8Co0.1Mn0.1)O2 Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910011104 LiM1 Inorganic materials 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910014689 LiMnO Inorganic materials 0.000 description 1
- 229910013716 LiNi Inorganic materials 0.000 description 1
- 229910013210 LiNiMnCoO Inorganic materials 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000003660 carbonate based solvent Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000011357 graphitized carbon fiber Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- VGYDTVNNDKLMHX-UHFFFAOYSA-N lithium;manganese;nickel;oxocobalt Chemical compound [Li].[Mn].[Ni].[Co]=O VGYDTVNNDKLMHX-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
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- 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
- H01M2220/00—Batteries for particular applications
- H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
-
- 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 for a battery and a secondary battery including the same, and more particularly, to an electrolyte solution for a battery including an electrolyte solution additive capable of improving output characteristics and high-temperature storage characteristics of the battery and significantly reducing gas generation, and a secondary battery containing the same. It's about batteries.
- a lithium secondary battery enables smooth movement of lithium ions by putting an electrolyte solution between the positive and negative electrodes, and uses electric energy by generating or consuming electricity by oxidation-reduction reactions caused by intercalation and desorption at the positive and negative electrodes.
- the present invention provides an electrolyte solution for a battery including an electrolyte solution additive capable of improving output characteristics and high-temperature storage characteristics of a battery and significantly reducing gas generation, and a secondary battery including the same. intended to provide
- Another object of the present invention is to provide an excellent secondary battery capable of reducing discharge resistance, thereby improving battery output, improving recovery capacity at high temperatures, enabling long-term storage, and suppressing gas generation in the battery.
- the present invention provides an electrolyte solution additive comprising a compound represented by the following formula (1) and an electrolyte solution for a battery including the same.
- R 1 , R 2 and R 3 are each independently a straight-chain or branched alkyl group including a halogen substituent having 1 to 7 carbon atoms.
- the halogen substituent may be fluorine.
- the compound represented by Formula 1 may be included in an amount of 0.1 to 10% by weight based on 100% by weight of the total electrolyte solution.
- the electrolyte solution for a battery may include an organic sulfur compound in an amount of greater than 0 wt% to less than 1.5 wt% based on 100 wt% of the electrolyte solution.
- the organosulfur compound may be a sulfate compound, a sultone compound, or a mixture thereof.
- the sulfate compound is at least one selected from ethylene sulfate and 1,3-propylene sulfate
- the sultone compound is 1,3-propane sultone
- 3-fluoro-1,3-propane sulfone (3-fluoro-1,3-propane sultone) may be at least one selected from.
- the mixing may include a sulfate compound and a sultone compound in a weight ratio of 1:0.5 to 1.5 (sulfate compound:sultone compound).
- the organosulfur compound for the battery is at least one selected from the group consisting of vinylene carbonate (VC), fluoroethylene carbonate (FEC) and difluoroethylene carbonate, in a total of 100% by weight of the electrolyte Based on 0.3 to 10% by weight may be included.
- VC vinylene carbonate
- FEC fluoroethylene carbonate
- difluoroethylene carbonate in a total of 100% by weight of the electrolyte Based on 0.3 to 10% by weight may be included.
- the electrolyte solution includes ethylene carbonate (EC), diethyl carbonate (DEC), ethylmethyl carbonate (EMC), dimethyl carbonate (DMC), propylene carbonate (PC), dipropyl carbonate (DPC), butylene carbonate, methylpropyl carbonate and At least one organic solvent selected from the group consisting of ethylpropyl carbonate may be included.
- the electrolyte is LiPF 6 , LiBF 4 , LiCl, LiBr, LiI, LiClO 4 , LiB 10 Cl 10 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li and (CF 3 SO 2 ) 2 It may include one or more lithium salts selected from the group consisting of NLi.
- a secondary battery including a negative electrode, a positive electrode, a separator interposed between the negative electrode and the positive electrode, and an electrolyte solution, wherein the electrolyte solution may be the aforementioned electrolyte solution.
- the secondary battery may have a discharge resistance value of 42.1 m ⁇ or less at 60 °C.
- the secondary battery may have a recovery capacity retention rate of 96.9% or more at 60° C. calculated by Equation 2 below.
- Recovery capacity retention rate (%) ⁇ (recovery capacity after high temperature storage - initial recovery capacity) / initial recovery capacity ⁇ X 100
- the secondary battery may have a thickness increase rate of 5.9% or less at 60 °C calculated by Equation 3 below.
- Thickness increase rate (%) ⁇ (thickness after high temperature storage - initial thickness) / initial thickness ⁇ X 100
- the secondary battery may be an energy storage system (ESS) or a vehicle battery.
- ESS energy storage system
- vehicle battery ESS
- the output can be improved by reducing the discharge resistance, and the recovery capacity at high temperature is improved, thereby providing a secondary battery with excellent long life and high temperature capacity retention rate.
- the additive for a battery according to the present invention has an effect of suppressing gas generation in a battery to provide a secondary battery with excellent performance and lifespan.
- the present inventors studied a secondary battery having improved output, high temperature recovery capacity and excellent lifespan characteristics, when adding an additive having a specific structure to the electrolyte of the secondary battery, the above It was confirmed that all of the objects of can be achieved, and based on this, further research was conducted to complete the present invention.
- the electrolyte solution additive of the present invention is characterized in that it includes a compound represented by the following formula (1).
- R 1 , R 2 and R 3 are each independently a straight-chain or branched alkyl group including a halogen substituent having 1 to 7 carbon atoms.
- the electrolyte solution for a battery of the present invention is characterized in that it includes the electrolyte solution additive.
- the electrolyte solution additive including the compound represented by Formula 1 When the electrolyte solution additive including the compound represented by Formula 1 is added to the electrolyte solution of a secondary battery, electrons are localized toward the O element due to the electronegativity difference between the B element and the O element directly connected thereto. Accordingly, element B becomes electron-deficient (e-poor, ⁇ +), and an oxidation reaction is induced in an electrolyte solution containing lithium ions, forming a stable film on an electrode, for example, a cathode, and substituting at the terminal. Improved ionic conductivity due to halogenated substituents.
- the decomposition of the electrolyte can be prevented, and thus the cycle characteristics can be improved, and in particular, it does not decompose at a high temperature, so that the high temperature storage property is lowered as the conventional electrode film is decomposed at a high temperature.
- an increase in resistance is prevented to improve charging efficiency and output, and gas generation due to a chemical reaction inside the battery is also suppressed, thereby improving battery safety.
- gas generation inside the battery is mainly caused by the decomposition of electrolyte components, especially carbonate-based solvents, on the surface of the anode/cathode electrodes, and the anode/cathode protective film is easily deteriorated or is further promoted due to oxygen radicals generated from the cathode.
- This material forms a highly stable protective film composed of B, O, and F components to suppress direct decomposition of the solvent, and prevents the elution of transition metal ions at the anode due to deterioration of the anode by the metal ion coordination effect of the B-O group. As a result, it is possible to prevent the escape of the oxygen element constituting the skeleton of the anode.
- the structure of the electrode active materials of the positive electrode and the negative electrode is prevented from collapsing at high temperatures, thereby improving the capacity retention rate, thereby prolonging the lifespan.
- the R 1 , R 2 and R 3 are each independently a straight-chain or branched alkyl group including a halogen substituent having 1 to 7 carbon atoms. It may preferably be a straight-chain alkyl group containing a halogen substituent of 1 to 5 carbon atoms, more preferably an alkyl group containing a halogen substituent of 2 or less carbon atoms.
- the halogen substituent included in the compound represented by Formula 1 may be, for example, fluorine or iodine, preferably fluorine.
- Fluorine is an element with the highest electronegativity of 3.98, and when the halogen substituent is fluorine, the polarity of the compound represented by Chemical Formula 1 increases.
- the ionic mobility of the electrolyte containing the compound represented by Formula 1 and the organic solvent can be improved, and the compound forms a hydrogen bond with the electrode active material on the surface of the electrode, which can occur during charging and discharging of the battery. It is possible to prevent the side reaction of the battery, the effect of improving the stability and charge and discharge efficiency of the battery can be maximized.
- R 1 , R 2 and R 3 are each independently a trifluoromethyl group or a difluoromethyl group, and R 1 , R 2 and R 3 are all trifluoromethyl groups, or all are difluoromethyl groups.
- a methyl group it is chemically stable and inactive, and the molecular structure is simplified, so it is most preferable in terms of stability.
- the compound represented by Formula 1 may preferably be a compound represented by Formula 2 or Formula 3 below.
- the electrolyte solution additive includes the compound represented by Formula 2 or Formula 3, it is preferable in terms of the above-described molecular structure stabilization and chemical stability, ion mobility of the electrolyte solution, and prevention of side reactions of the electrode active material.
- the compound represented by Formula 1 may be included in an amount of, for example, 0.01 to 10.0% by weight, preferably 0.1 to 5.0% by weight, more preferably 0.1 to 2.0% by weight, based on 100% by weight of the battery electrolyte. More preferably 0.1 to 1.5% by weight, most preferably 0.1 to 1.2% by weight.
- the content of the electrolyte additive satisfies the above range, it is preferable in terms of improving the charging efficiency and high-temperature lifespan of the battery.
- the electrolyte solution for a battery of the present invention includes an organic sulfur compound for the purpose of improving lifespan characteristics of a battery, suppressing battery capacity decrease, and improving discharge capacity of a battery, in addition to the electrolyte additive represented by Formula 1 as an electrolyte additive.
- the organosulfur compound includes, for example, a sulfate compound and/or a sultone compound.
- the sulfate compound may include, for example, ethylene sulfate, 1,3-propylene sulfate, and the like.
- the sultone compound may include, for example, 1,3-propane sultone, 3-fluoro-1,3-propane sultone, and the like. .
- the organosulfur compound is preferably one or more selected from sulfate compounds and one or more selected from sultone compounds may be used in combination. In this case, it is possible to improve the lifetime by reducing the discharge resistance and suppressing gas generation.
- the discharge resistance is directly related to output performance corresponding to vehicle driving performance.
- the organosulfur compound may be included in the battery electrolyte in an amount of, for example, 1.5% by weight or less, preferably 0.3 to 1.5% by weight, and more preferably 0.7 to 1.2% by weight.
- an effect of improving low-temperature characteristics and cycle characteristics of a battery may be excellent.
- the weight ratio of the sulfate compound and the sultone compound in the battery electrolyte is 1:0.5 to 1.5 (sulfate compound: sultone compound), or 1:0.8 to 1.2 (sulfate compound: It may be included in the weight ratio of the sultone compound). Within this range, discharge resistance can be effectively reduced and lifespan can be improved.
- components added to improve performance of lithium secondary batteries and lithium ion capacitors include vinylene carbonate (VC), fluoroethylene carbonate (FEC), and difluoroethylene carbonate. 0.3 to 10% by weight, preferably 0.7 to 5% by weight, more preferably 1 to 4% by weight, and even more preferably 2 to 4% by weight.
- VC vinylene carbonate
- FEC fluoroethylene carbonate
- difluoroethylene carbonate 0.3 to 10% by weight, preferably 0.7 to 5% by weight, more preferably 1 to 4% by weight, and even more preferably 2 to 4% by weight.
- the organic solvent included in the battery electrolyte may be, for example, a carbonate-based organic solvent, specifically ethylene carbonate (EC), diethyl carbonate (DEC), ethylmethyl carbonate (EMC), dimethyl carbonate (DMC), propylene carbonate (PC), dipropyl carbonate (DPC), butylene carbonate, may be an organic solvent containing at least one selected from the group consisting of methylpropyl carbonate and ethylpropyl carbonate.
- EC ethylene carbonate
- DEC diethyl carbonate
- EMC ethylmethyl carbonate
- DMC dimethyl carbonate
- PC propylene carbonate
- DPC dipropyl carbonate
- butylene carbonate may be an organic solvent containing at least one selected from the group consisting of methylpropyl carbonate and ethylpropyl carbonate.
- the organic solvent may be, for example, one type or a mixed solvent of two or more types.
- an organic solvent having a high dielectric constant having high ionic conductivity and a viscosity of the solvent is suitable for application to a battery so as to improve the charge/discharge performance of the battery.
- a low-viscosity organic solvent that can be adjusted to have an appropriate viscosity can be mixed and used as a mixed solvent.
- EC and/or PC may be used as the high dielectric constant organic solvent
- EMC, DMC and/or DEC may be used as the low viscosity organic solvent
- the high dielectric constant and low viscosity organic solvent may be used.
- the solvent is preferably mixed in a volume ratio of 2:8 to 8:2. More specifically, with EC or PC; EMC; and DMC or DEC; may be a ternary mixed solvent of EC or PC; EMC; and DMC or DEC; may have a volume ratio of 2:3 to 5:2 to 4 (EC or PC: EMC: DMC or DEC).
- the organic solvent may be used in an amount remaining after subtracting the contents of components other than the organic solvent in the electrolyte solution.
- the moisture content in the organic solvent is preferably controlled to 150 ppm or less, preferably 100 ppm or less.
- the lithium salt contained in the battery electrolyte may be used without particular limitation as long as it is a compound capable of providing lithium ions used in a lithium secondary battery.
- LiPF 6 , LiBF 4 , LiCl, LiBr, LiI, LiClO 4 , LiB 10 At least one selected from the group consisting of Cl 10 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, and (CF 3 SO 2 ) 2 NLi.
- it may be LiPF 6 .
- the lithium salt When the lithium salt is dissolved in the electrolyte solution, the lithium salt functions as a source of lithium ions in the lithium secondary battery and can promote the movement of lithium ions between the positive electrode and the negative electrode. Accordingly, the lithium salt is preferably included in a concentration of about 0.6 to 2 M in the electrolyte solution. When the concentration of the lithium salt is less than 0.6 M, the conductivity of the electrolyte may be lowered and thus electrolyte performance may be deteriorated. When the concentration of the lithium salt is greater than 2 M, the viscosity of the electrolyte may increase and mobility of lithium ions may be reduced. Considering the conductivity of the electrolyte and the mobility of lithium ions, the lithium salt may be preferably included in an amount of 0.7 to 1.6 M, more preferably 0.8 to 1.5 M in the electrolyte solution.
- the secondary battery of the present invention is characterized in that it includes a negative electrode, a positive electrode, a separator interposed between the negative electrode and the positive electrode, and the battery electrolyte.
- the cathode may be prepared by preparing a composition for forming a cathode active material layer by mixing a cathode active material, a binder, and optionally a conductive agent, and then applying the composition to a cathode current collector such as aluminum foil.
- the cathode active material may be a conventional NCM (lithium nickel manganese cobalt oxide, LiNiMnCoO 2 ) cathode active material used in lithium secondary batteries, and specifically, has the chemical formula Li[NixCo 1-xy Mn y ]O 2 (here 0 ⁇ x ⁇ 0.5, 0 ⁇ y ⁇ 0.5) may be a lithium composite metal oxide in the form, but is not limited thereto.
- NCM lithium nickel manganese cobalt oxide
- LiNiMnCoO 2 lithium nickel manganese cobalt oxide
- LiNiMnCoO 2 lithium nickel manganese cobalt oxide
- the variables x and y of the formula Li[NixCo 1-xy Mn y ]O 2 of the lithium composite metal oxide are, for example, 0.0001 ⁇ x ⁇ 0.5, 0.0001 ⁇ y ⁇ 0.5, or 0.001 ⁇ x ⁇ 0.3, 0.001 ⁇ y ⁇ 0.3 can be
- a compound capable of reversible intercalation and deintercalation of lithium may be used as the cathode active material.
- the negative electrode may be prepared by preparing a composition for forming a negative electrode active material layer by mixing a negative electrode active material, a binder, and optionally a conductive agent, and then applying the composition to a negative electrode current collector such as copper foil.
- the negative electrode active material for example, a compound capable of reversible intercalation and deintercalation of lithium may be used.
- the negative electrode active material may be a carbonaceous material such as artificial graphite, natural graphite, graphitized carbon fiber, or amorphous carbon.
- a metallic compound capable of alloying with lithium or a composite including a metallic compound and a carbonaceous material may also be used as an anode active material, and for example, graphite may be used.
- silicon may be added to improve the performance of the carbonaceous material.
- the metal capable of alloying with lithium for example, at least one selected from Si, Al, Sn, Pb, Zn, Bi, In, Mg, Ga, Cd, Si alloy, Sn alloy, or Al alloy may be used.
- a metal lithium thin film may be used as the anode active material.
- the negative electrode active material one or more selected from the group consisting of crystalline carbon, amorphous carbon, carbon composites, lithium metal, and lithium-containing alloys may be used in view of high stability.
- a secondary battery according to an embodiment of the present invention by adding an electrolyte solution additive represented by Formula 1 to improve battery performance, battery discharge resistance, output characteristics, 60 °C measured by HPPC (Hybrid Pulse Power Characterization) method There is an effect of improving battery characteristics such as capacity recovery characteristics and life characteristics at high temperatures above.
- an electrolyte solution additive represented by Formula 1 to improve battery performance, battery discharge resistance, output characteristics, 60 °C measured by HPPC (Hybrid Pulse Power Characterization) method
- a performance improver is added in addition to the electrolyte additive represented by Formula 1 added to the electrolyte, so that the battery discharge resistance, output characteristics, 60 measured by HPPC (Hybrid Pulse Power Characterization) method There is an effect of further improving battery characteristics such as capacity recovery characteristics and life characteristics at a high temperature of ° C or higher.
- the secondary battery of the present invention may have an HPPC discharge resistance value measured at 60 ° C. of 42.1 m ⁇ or less, preferably 38.6 to 42.1 m ⁇ .
- the secondary battery may have an HPPC discharge resistance increase rate (DCIR increase rate) of 26.2% or less, preferably 20.3 to 26.2%, at 60° C. calculated by Equation 1 below.
- DCIR increase rate HPPC discharge resistance increase rate
- DCIR increase rate (%) ⁇ (discharge resistance after storage at high temperature - initial resistance) / initial resistance ⁇ X 100
- the HPPC discharge resistance value can be measured by the method prescribed in the document “Battery test manual for plug-in hybrid electric vehicles,” (2010, Idaho National Laboratory for the U.S. Department of Energy.), It is an important indicator of battery characteristics such as battery output.
- the discharge resistance is a resistance value measured during discharging of the battery, and improved output performance can be provided within the above range. The lower the discharge resistance, the smaller the energy loss, the faster the charging speed, and the higher the output of the battery.
- the secondary battery of the present invention has excellent charging speed and output because the HPPC discharge resistance value is reduced as described above, and is suitable for use as, for example, an automobile battery.
- the secondary battery may have a recovery capacity of 774.8 m ⁇ or more, preferably 774.8 to 790.0 m ⁇ , measured at 60 °C.
- the secondary battery may have a recovery capacity retention rate of 96.9% or more, preferably 96.9 to 98.8%, at 60° C. calculated by Equation 2 below.
- Recovery capacity retention rate (%) ⁇ (recovery capacity after high temperature storage - initial recovery capacity) / initial recovery capacity ⁇ X 100
- the recovery capacity represents the capacity conservation characteristics of a battery left for a long time, and the discharged electric capacity when the battery left for a long time is discharged to the discharge end voltage, and the discharge end voltage after recharging the discharged battery.
- the discharged capacitance when discharged to , respectively, is measured, and the two capacitance values are compared.
- the higher the recovery capacity the smaller the amount of natural discharge due to battery preservation (storage), which means that the battery can be stored for a long time.
- the higher the storage temperature of the battery the faster the natural discharge rate. This is a very important characteristic in batteries.
- the electrolyte solution additive of the present invention is added to the electrolyte solution for a battery, the recovery capacity is improved, and there is an effect that can be stored for a longer period of time with a single charge.
- the secondary battery may have a thickness of 3.27 mm or less, preferably 3.13 to 3.23 mm, measured at 60 °C.
- the secondary battery may have a thickness increase rate of 5.9% or less, preferably 3.0 to 5.9%, at 60 °C calculated by Equation 3 below.
- Thickness increase rate (%) ⁇ (thickness after high temperature storage - initial thickness) / initial thickness ⁇ X 100
- the thickness increase rate indicates swelling characteristics due to gas generation inside the battery, and the initial thickness and thickness of the pouch cell after being left at a high temperature are measured, respectively, and the difference between the two values is compared.
- the battery of the present invention when used as a vehicle battery, it improves output, which is important depending on the size of the vehicle, and at low and high temperatures, which is a problem in the environment of the vehicle, which is mostly exposed to sunlight during climate change, driving or parking. Improvement in performance and lifespan of the battery is made, and thus, excellent performance can be exhibited as an automobile battery.
- An electrolyte solution for a battery was prepared by adding the weight %.
- Example 2 The same procedure as in Example 1 was performed except that the compound represented by Formula 2 was changed to the compound represented by Formula 3 below.
- Example 2 was conducted in the same manner as in Example 2, except that the compound represented by Formula 2 was changed to the compound represented by Formula 3 below.
- An electrolyte solution for a battery was prepared by adding 0.5 wt% of ethylene sulfate, 0.5 wt% of 1,3-propylene sultone, and 3 wt% of fluoroethylene carbonate as organic sulfur compounds.
- Example 5 was carried out except that the compound represented by Formula 2 was used in an amount of 0.5% by weight.
- An electrolyte solution for a battery was prepared by adding 0.5 wt% of ethylene sulfate, 0.5 wt% of 1,3-propylene sultone, and 3 wt% of fluoroethylene carbonate as organic sulfur compounds.
- Example 7 was carried out except that the compound represented by Formula 3 was used in an amount of 0.5% by weight.
- Example 1 was carried out in the same manner as in Example 1, except that the compound represented by Formula 2 was not included.
- Example 2 was carried out in the same manner as in Example 2, except that the compound represented by Formula 2 was changed to the compound represented by Formula 4 below.
- Example 2 was carried out in the same manner as in Example 2, except that the compound represented by Formula 2 was changed to the compound represented by Formula 5 below.
- Example 5 was carried out in the same manner as in Example 5, except that the compound represented by Chemical Formula 2 was changed to 1-propene-1,3-sultone.
- a positive electrode mixture slurry was prepared by adding 100 parts by weight of the positive electrode mixture to 100 parts by weight of N-methyl-2-pyrrolidone (hereinafter referred to as 'NMP') as a solvent.
- the positive electrode mixture slurry was coated on an aluminum (Al) thin film, which is a positive electrode current collector, and dried to have a thickness of about 20 ⁇ m, and then a roll press was performed to prepare a positive electrode.
- a negative electrode mixture containing 96% by weight, 3% by weight, and 1% by weight of carbon powder obtained by mixing artificial graphite and natural graphite as a negative electrode active material, PVdF as a binder, and carbon black as a conductive agent, respectively.
- An anode mixture slurry was prepared by adding 100 parts by weight of NMP as a solvent.
- the negative electrode mixture slurry was coated on a copper (Cu) thin film as a negative electrode current collector having a thickness of 10 ⁇ m, dried to prepare a negative electrode, and then roll pressed to prepare a negative electrode.
- Cu copper
- the measured voltage value at 60 ° C, the charge and discharge current value corresponding to the C-rate, the current change ( ⁇ I), the discharge voltage change ( ⁇ V), the charge voltage change ( ⁇ V), Discharge resistance and charging resistance are measured, and the charge/discharge current for each C-rate is briefly flowed for a certain period of time, and the resistance value is calculated with the slope value obtained from the current and voltage change. showed up
- the DCIR increase rate (%) was calculated by substituting the initial resistance value and the discharge resistance value after high temperature storage into Equation 1 below.
- DCIR increase rate (%) ⁇ (discharge resistance after storage at high temperature - initial resistance) / initial resistance ⁇ X 100
- the charging conditions were charged until the charging current became 1/10C at a constant current of 1.0C and a voltage of 4.2V.
- As for the discharge conditions after charging and discharging by discharging up to 3.0V at a constant current of 1.0C, (initial) recovery capacity was measured.
- the recovery capacity retention rate (%) within the corresponding item was calculated by substituting the recovery capacity value measured initially and the recovery capacity value after high temperature storage in Equation 2 below.
- Recovery capacity retention rate (%) ⁇ (recovery capacity after high temperature storage - initial recovery capacity) / initial recovery capacity ⁇ X 100
- the thickness of the secondary battery was measured using a pressure-type thickness meter manufactured by Mitutoyo, in a state in which the pouch cell was placed between compression plates and then compressed with a weight of 300 g.
- the results of measuring the thickness immediately after taking it out of the oven at 60 ° C are shown in the initial thickness section in Table 1 below, and the thickness values measured in the same way after storage in a thermostat at 60 ° C for 4 weeks are shown in the table below. 1, it is shown in the thickness item after high temperature storage.
- the thickness increase rate (%) in the corresponding item was calculated by substituting the initially measured thickness value and the thickness value after high temperature storage in Equation 3 below.
- Thickness increase rate (%) ⁇ (thickness after high temperature storage - initial thickness) / initial thickness ⁇ X 100
- the secondary battery is charged with a constant current at 60 ° C. at a current of 1C rate until the voltage reaches 4.20V (vs. Li), and then cut-off at a current of 0.05C rate while maintaining 4.20V in constant voltage mode. did Subsequently, the discharge was performed at a constant current at a rate of 1C until the voltage reached 3.0V (vs. Li) during discharge (1st cycle). The cycle as described above was repeated 300 times, and the average value thereof was calculated and shown in FIGS. 1 and 2 below.
- Example 1 32.1 38.6 20.3 785.6 (98.2) 3.04 3.13 (3.0)
- Example 2 33.4 41.5 24.3 780.5 (97.6) 3.03 3.16 (4.3)
- Example 3 32.7 38.9 18.9 781.8 (97.7) 3.05 3.16 (3.6)
- Example 4 33.6 42.1 25.3 774.8 (96.9) 3.05 3.23 (5.9)
- Example 5 32.8 40.5 23.5 790.0 (98.8) 3.04 3.14 (3.3)
- Example 6 32.6 40.7 24.8 789.7 (98.7) 3.04 3.13 (3.0)
- Example 7 32.7 41.2 26.0 788.4 (98.6) 3.05 3.15 (3.3
- Examples 1 to 8 containing the compound represented by Formula 1 according to the present invention have initial resistance, resistance after high temperature storage, DCIR increase rate, recovery capacity and retention rate after high temperature storage, initial thickness, high temperature storage It was confirmed that in all items of post-thickness and increase rate, improved results were obtained compared to Comparative Examples 1 to 3 and Reference Example 1 not containing the compound. In particular, when the compound was used in a relatively excessive amount within an appropriate range, it can be seen that in Examples 2 and 4, compared to Examples 1 and 3 using a relatively small amount, the low resistance and gas reduction effect were large.
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Abstract
Description
구분 | 초기 방전 저항 (초기 DCIR, mΩ) |
고온저장 후 방전 저항 (30일 후 DCIR, mΩ) |
DCIR 증가율 (식 1, %) |
고온 저장 후 회복용량 (mAh) & 회복용량 유지율 (식 2, %) |
초기 두께 (mm) |
고온 저장 후 두께 (mm) & 두께 증가율 (식 3, %) |
실시예1 | 32.1 | 38.6 | 20.3 | 785.6 (98.2) |
3.04 | 3.13 (3.0) |
실시예2 | 33.4 | 41.5 | 24.3 | 780.5(97.6) | 3.03 | 3.16 (4.3) |
실시예3 | 32.7 | 38.9 | 18.9 | 781.8(97.7) | 3.05 | 3.16 (3.6) |
실시예4 | 33.6 | 42.1 | 25.3 | 774.8(96.9) | 3.05 | 3.23 (5.9) |
실시예5 | 32.8 | 40.5 | 23.5 | 790.0(98.8) | 3.04 | 3.14 (3.3) |
실시예6 | 32.6 | 40.7 | 24.8 | 789.7(98.7) | 3.04 | 3.13 (3.0) |
실시예7 | 32.7 | 41.2 | 26.0 | 788.4(98.6) | 3.05 | 3.15 (3.3) |
실시예8 | 32.8 | 41.4 | 26.2 | 786.1(98.3) | 3.04 | 3.16 (3.9) |
비교예1 | 36.3 | 45.9 | 26.4 | 767.5 (95.9) |
3.05 | 3.41 (11.8) |
비교예2 | 34.6 | 44.5 | 28.6 | 765.8(95.7) | 3.04 | 3.33 (9.5) |
비교예3 | 34.3 | 43.1 | 25.7 | 771.2(96.4) | 3.05 | 3.28 (7.5) |
참조예1 | 34.2 | 42.7 | 24.9 | 789.5(98.7) | 3.04 | 3.18 (4.6) |
Claims (16)
- 제 1항에 있어서,상기 화학식 1로 표시되는 화합물은, 상기 할로겐 치환기가 불소인 것을 특징으로 하는 전지용 전해액.
- 제 1항에 있어서,상기 화학식 1로 표시되는 화합물은 상기 전해액 총 100 중량%를 기준으로 0.1 내지 10 중량%로 포함되는 것을 특징으로 하는 전지용 전해액.
- 제 1항에 있어서,상기 전지용 전해액은 유기 황 화합물을 상기 전해액 총 100 중량%를 기준으로 1.5 중량% 이하로 더 포함하는 것을 특징으로 하는 전지용 전해액.
- 제 4항에 있어서,상기 유기 황 화합물은 설페이트 화합물, 술톤 화합물 또는 이들의 혼합인 것을 특징으로 하는 전지용 전해액.
- 제 5항에 있어서,상기 설페이트 화합물은 에틸렌 설페이트(ethylene sulfate) 및 1,3-프로필렌 설페이트(1,3-propylene sulfate) 중에서 선택된 1종 이상이고, 상기 술톤 화합물은 1,3-프로판설톤(1,3-propane sultone) 및 3-플루오로-1,3-프로판술폰(3-fluoro-1,3-propane sultone) 중에서 선택된 1종 이상인 것을 특징으로 하는 전지용 전해액.
- 제 5항에 있어서,상기 혼합은, 설페이트 화합물과 술톤 화합물을 1:0.5 내지 1.5(설페이트 화합물: 술톤 화합물)의 중량비로 포함하는 것을 특징으로 하는 전지용 전해액.
- 제 4항에 있어서,상기 전지용 유기 황 화합물은 비닐렌카보네이트(vinylenecarbonate, VC), 플루오로에틸렌카보네이트(fluoroethylene carbonate, FEC) 및 디플루오로에틸렌카보네이트(difluoroethylenecarbonate)로 이루어진 군으로부터 선택된 1종 이상을, 상기 전해액 총 100 중량%를 기준으로 0.3 내지 10 중량%로 더 포함하는 것을 특징으로 하는 전지용 전해액.
- 제 1항에 있어서,상기 전해액은 에틸렌 카보네이트(EC), 디에틸 카보네이트(DEC), 에틸메틸 카보네이트(EMC), 디메틸 카보네이트(DMC), 프로필렌 카보네이트(PC), 디프로필 카보네이트(DPC), 부틸렌 카보네이트, 메틸프로필 카보네이트 및 에틸프로필 카보네이트로 이루어진 군에서 선택된 1종 이상의 유기 용매를 포함하는 것을 특징으로 하는 전지용 전해액.
- 제 1항에 있어서,상기 전해액은 LiPF6, LiBF4, LiCl, LiBr, LiI, LiClO4, LiB 10Cl 10, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li 및 (CF3SO2)2NLi로 이루어진 군에서 선택된 1종 이상의 리튬염을 포함하는 것을 특징으로 하는 전지용 전해액.
- 음극, 양극, 상기 음극과 양극 사이에 개재된 분리막 및 전해액을 포함하는 이차전지로서,상기 전해액은 제 1항 내지 제 10항 중 어느 한 항의 전해액인 것을 특징으로 하는 리튬 이차전지.
- 제 12항에 있어서,상기 이차전지는, 60 ℃에서 방전 저항 값이 42.1 mΩ 이하인 것을 특징으로 하는 리튬 이차전지.
- 제12항에 있어서,상기 이차전지는, 하기 수학식 2로 계산된 60 ℃에서의 회복용량 유지율이 96.9 % 이상인 것을 특징으로 하는 리튬 이차전지.[수학식 2]회복용량 유지율(%) = {(고온 저장 후 회복용량 - 초기 회복용량) / 초기 회복용량} Ⅹ 100
- 제12항에 있어서,상기 이차전지는, 하기 수학식 3으로 계산된 60 ℃에서의 두께 증가율이 5.9 % 이하인 것을 특징으로 하는 리튬 이차전지.[수학식 3]두께 증가율(%) = {(고온 저장 후 두께 - 초기 두께) / 초기 두께} Ⅹ 100
- 제12항에 있어서,상기 이차전지는 에너지 저장시스템(ESS) 또는 자동차용 전지인 것을 특징으로 하는 리튬 이차전지.
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JP2002358999A (ja) * | 2001-06-01 | 2002-12-13 | Gs-Melcotec Co Ltd | 非水電解質二次電池 |
US20050171383A1 (en) * | 2000-09-21 | 2005-08-04 | Hitachi, Ltd. | Organic borate compounds and the nonaqueous electrolytes and lithium secondary batteries using the compounds |
JP2006019070A (ja) * | 2004-06-30 | 2006-01-19 | Matsushita Electric Ind Co Ltd | 非水電解質および非水電解質二次電池ならびにそれらの製造法 |
KR20080111139A (ko) * | 2006-04-27 | 2008-12-22 | 미쓰비시 가가꾸 가부시키가이샤 | 비수계 전해액 및 비수계 전해액 이차 전지 |
KR101295395B1 (ko) | 2004-12-10 | 2013-08-09 | 소니 주식회사 | 전지 |
JP2018156782A (ja) * | 2017-03-16 | 2018-10-04 | 積水化学工業株式会社 | 非水二次電池用添加剤及びそれを用いた非水二次電池用電解液並びに非水二次電池 |
-
2021
- 2021-06-23 KR KR1020210081292A patent/KR20220170456A/ko active Search and Examination
-
2022
- 2022-06-15 EP EP22828659.7A patent/EP4362161A1/en active Pending
- 2022-06-15 WO PCT/KR2022/008448 patent/WO2022270812A1/ko active Application Filing
- 2022-06-15 US US18/568,939 patent/US20240291034A1/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US20050171383A1 (en) * | 2000-09-21 | 2005-08-04 | Hitachi, Ltd. | Organic borate compounds and the nonaqueous electrolytes and lithium secondary batteries using the compounds |
JP2002358999A (ja) * | 2001-06-01 | 2002-12-13 | Gs-Melcotec Co Ltd | 非水電解質二次電池 |
JP2006019070A (ja) * | 2004-06-30 | 2006-01-19 | Matsushita Electric Ind Co Ltd | 非水電解質および非水電解質二次電池ならびにそれらの製造法 |
KR101295395B1 (ko) | 2004-12-10 | 2013-08-09 | 소니 주식회사 | 전지 |
KR20080111139A (ko) * | 2006-04-27 | 2008-12-22 | 미쓰비시 가가꾸 가부시키가이샤 | 비수계 전해액 및 비수계 전해액 이차 전지 |
JP2018156782A (ja) * | 2017-03-16 | 2018-10-04 | 積水化学工業株式会社 | 非水二次電池用添加剤及びそれを用いた非水二次電池用電解液並びに非水二次電池 |
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US20240291034A1 (en) | 2024-08-29 |
KR20220170456A (ko) | 2022-12-30 |
EP4362161A1 (en) | 2024-05-01 |
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