WO2023075573A1 - 단일벽 탄소나노튜브가 적용된 음극 및 이를 포함하는 이차전지 - Google Patents
단일벽 탄소나노튜브가 적용된 음극 및 이를 포함하는 이차전지 Download PDFInfo
- Publication number
- WO2023075573A1 WO2023075573A1 PCT/KR2022/016940 KR2022016940W WO2023075573A1 WO 2023075573 A1 WO2023075573 A1 WO 2023075573A1 KR 2022016940 W KR2022016940 W KR 2022016940W WO 2023075573 A1 WO2023075573 A1 WO 2023075573A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- negative electrode
- active material
- carbon nanotubes
- walled carbon
- conductive material
- Prior art date
Links
- 239000002109 single walled nanotube Substances 0.000 title claims abstract description 64
- 239000004020 conductor Substances 0.000 claims abstract description 55
- 239000007773 negative electrode material Substances 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 239000002409 silicon-based active material Substances 0.000 claims abstract description 8
- 239000011149 active material Substances 0.000 claims description 53
- 239000006185 dispersion Substances 0.000 claims description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 27
- 239000011230 binding agent Substances 0.000 claims description 22
- 239000000243 solution Substances 0.000 claims description 21
- 239000002270 dispersing agent Substances 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 17
- 239000006183 anode active material Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 239000002904 solvent Substances 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 102100028667 C-type lectin domain family 4 member A Human genes 0.000 claims description 9
- 101000766908 Homo sapiens C-type lectin domain family 4 member A Proteins 0.000 claims description 9
- 239000006182 cathode active material Substances 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 229910021437 lithium-transition metal oxide Inorganic materials 0.000 claims description 7
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 5
- 239000008151 electrolyte solution Substances 0.000 claims description 4
- 229910052736 halogen Inorganic materials 0.000 claims description 4
- 150000002367 halogens Chemical class 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000007774 positive electrode material Substances 0.000 claims description 4
- 229910018040 Li 1+x Ni Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 239000002041 carbon nanotube Substances 0.000 description 11
- 229910021393 carbon nanotube Inorganic materials 0.000 description 11
- -1 Bi 2 O 4 Inorganic materials 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 238000007599 discharging Methods 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- 239000002048 multi walled nanotube Substances 0.000 description 7
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 230000002902 bimodal effect Effects 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 239000011133 lead Substances 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- 229910015645 LiMn Inorganic materials 0.000 description 2
- 229910014689 LiMnO Inorganic materials 0.000 description 2
- 229910013716 LiNi Inorganic materials 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000004630 atomic force microscopy Methods 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- LDVMBMMEPJDZLP-UHFFFAOYSA-N oxirane;styrene Chemical compound C1CO1.C=CC1=CC=CC=C1 LDVMBMMEPJDZLP-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 108700028369 Alleles Proteins 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- UJKPHYRXOLRVJJ-MLSVHJFASA-N CC(O)C1=C(C)/C2=C/C3=N/C(=C\C4=C(CCC(O)=O)C(C)=C(N4)/C=C4\N=C(\C=C\1/N\2)C(C)=C4C(C)O)/C(CCC(O)=O)=C3C Chemical class CC(O)C1=C(C)/C2=C/C3=N/C(=C\C4=C(CCC(O)=O)C(C)=C(N4)/C=C4\N=C(\C=C\1/N\2)C(C)=C4C(C)O)/C(CCC(O)=O)=C3C UJKPHYRXOLRVJJ-MLSVHJFASA-N 0.000 description 1
- 229910005793 GeO 2 Inorganic materials 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910007969 Li-Co-Ni Inorganic materials 0.000 description 1
- 229910008163 Li1+x Mn2-x O4 Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910013709 LiNi 1-x M Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 229910006555 Li—Co—Ni Inorganic materials 0.000 description 1
- 229910018584 Mn 2-x O 4 Inorganic materials 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- QDDVNKWVBSLTMB-UHFFFAOYSA-N [Cu]=O.[Li] Chemical compound [Cu]=O.[Li] QDDVNKWVBSLTMB-UHFFFAOYSA-N 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical class [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910001420 alkaline earth metal ion Inorganic materials 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 229920003123 carboxymethyl cellulose sodium Polymers 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 229940105329 carboxymethylcellulose Drugs 0.000 description 1
- 229940063834 carboxymethylcellulose sodium Drugs 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 150000002019 disulfides Chemical class 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N germanium monoxide Inorganic materials [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- 239000000017 hydrogel Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- QEXMICRJPVUPSN-UHFFFAOYSA-N lithium manganese(2+) oxygen(2-) Chemical group [O-2].[Mn+2].[Li+] QEXMICRJPVUPSN-UHFFFAOYSA-N 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
- 238000005259 measurement Methods 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002073 nanorod Substances 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910021396 non-graphitizing carbon Inorganic materials 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920001197 polyacetylene Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000004627 regenerated cellulose Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920005608 sulfonated EPDM Polymers 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical group 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/134—Electrodes based on metals, Si or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- 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 a negative electrode to which single-walled carbon nanotubes are applied and a secondary battery including the same.
- a secondary battery is a representative example of an electrochemical device using such electrochemical energy, and its use area is gradually expanding.
- a lithium secondary battery is manufactured by impregnating an electrode assembly composed of a positive electrode, a negative electrode, and a porous separator with a lithium non-aqueous electrolyte, and each electrode forms an electrode mixture including an electrode active material, a conductive material, and a binder on a current collector.
- the basic performance characteristics of these lithium secondary batteries are greatly influenced by the anode material.
- the anode active material In order to maximize the performance of the battery, the anode active material must have an electrochemical reaction potential close to that of lithium metal, a high reaction reversibility with lithium ions, and a fast diffusion rate of lithium ions in the active material.
- Graphite is widely used as a material that meets these demands, and natural graphite has excellent adhesive strength and artificial graphite has excellent output characteristics and lifespan characteristics. Mixtures of graphite have been used.
- an anode active material such as SiO containing Si
- the volume expansion rate of the anode is high during charging and discharging, resulting in problems such as desorption of the anode mixture, thereby deteriorating lifespan characteristics.
- a porous matrix is used, a small-sized active material is dispersed in an inert matrix, the size of the active material is reduced, or the type or amount of the binder is adjusted.
- An object of the present invention is to solve the problems of the prior art and the technical problems that have been requested from the past.
- the problem to be solved by the present invention is to provide a secondary battery with improved lifespan characteristics according to cycle progression while lowering resistance by ensuring sufficient conductivity of active materials.
- the negative electrode mixture includes a negative electrode active material and a conductive material
- the negative electrode active material includes a silicon-based active material
- the conductive material is provided with a negative electrode composed of single-walled carbon nanotubes (SWCNTs).
- SWCNTs single-walled carbon nanotubes
- the single-walled carbon nanotubes may be included in a first shape connecting the surfaces of two or more negative electrode active material particles and a second shape covering the surfaces of each negative electrode active material particle, wherein the first shape
- the content of the conductive material may be 40% to 70% by weight of the total amount of the conductive material.
- the diameter of the single-walled carbon nanotubes may be 1 nm to 2 nm
- the length of the single-walled carbon nanotubes may be 2 ⁇ m to 5 ⁇ m
- the aspect ratio of the single-walled carbon nanotubes may be 1000 to 5000.
- the single-walled carbon nanotubes may be bundled and have a secondary shape.
- the negative electrode mixture may further include a binder and a dispersant.
- anode active material slurry including an active material and a conductive material composed of single-walled carbon nanotubes (SWCNTs)
- a method for manufacturing a negative electrode in which the conductive material of the single-walled carbon nanotubes is separately introduced is provided.
- the negative electrode active material slurry may further include a binder, and in this case, in the divided input, 30% to 60% by weight based on the total weight of the conductive material composed of the single-walled carbon nanotubes is a negative electrode active material and It may be pre-mixed, and the remaining 40% to 70% by weight of the conductive material composed of the single-walled carbon nanotubes are additionally added together with a binder and then mixed.
- a binder in this case, in the divided input, 30% to 60% by weight based on the total weight of the conductive material composed of the single-walled carbon nanotubes is a negative electrode active material and It may be pre-mixed, and the remaining 40% to 70% by weight of the conductive material composed of the single-walled carbon nanotubes are additionally added together with a binder and then mixed.
- the negative electrode active material is added to the pre-dispersion in an amount of 30 wt% to 60 wt% based on the total weight of the pre-dispersion solution, and in step (c), 40 wt% to 70 wt% based on the total weight of the pre-dispersion solution. % of the remaining pre-dispersion solution can be added.
- the present invention also, according to another embodiment,
- a positive electrode in which a positive electrode mixture including a positive electrode active material is formed on at least one surface of the positive electrode current collector;
- a secondary battery in which an electrode assembly including a separator interposed between the negative electrode and the positive electrode is embedded in a secondary battery case together with an electrolyte solution,
- the secondary battery provides a secondary battery having an increase rate of 47% or less in a 100th DCIR value compared to an initial DCIR value.
- the secondary battery may have a retention rate of 100 discharge capacity compared to the initial discharge capacity of 91% or more.
- the cathode active material may include a lithium transition metal oxide represented by Chemical Formula 1 below.
- M is at least one selected from the group consisting of Cu, Ti, Mg, Al, Pt, and Zr;
- A is an oxygen-substituted halogen
- the conductive material increases the connectivity between active materials and also increases the conductivity on the surface of the active material, so that resistance is significantly reduced and life characteristics can be improved.
- Example 1 is a SEM photograph of the surface of the negative electrode mixture of Example 1.
- Example 4 is a graph of life characteristics and resistance increase rate of Example 1 according to Experimental Example 2;
- the negative electrode mixture includes a negative electrode active material and a conductive material
- the negative electrode active material includes a silicon-based active material
- the conductive material is provided with a negative electrode composed of single-walled carbon nanotubes (SWCNTs).
- SWCNTs single-walled carbon nanotubes
- multi-walled carbon nanotubes with a large number of bonds constituting the wall were used, but in this case, still As the cycle progresses, there is a problem that their conductivity decreases.
- multi-walled carbon nanotubes have a relatively short length and are disadvantageous in securing conductivity between active materials.
- the inventors of the present application can exhibit both metallic and semiconducting properties at the same time, and have a small number of carbon nanotubes in the form of nano-rods, but use carbon nanotubes with a relatively long length.
- simple mixing of the conductive material and the active material is located on the surface of the active material to secure the conductivity of the negative electrode current collector and the active material, but there is a problem in that the conductivity between the negative electrode active material is lowered and sufficient conductivity cannot be obtained.
- the inventors have found that when the single-walled carbon nanotubes are included in a first form connecting the surfaces of two or more negative electrode active material particles and a second form covering the surfaces of each negative electrode active material particle, they have sufficient conductivity even if the cycle proceeds. Therefore, it was confirmed that the resistance increase rate is not large and the lifespan characteristic is improved, and the present invention has been completed.
- the content of the conductive material formed in the first shape may be 40% to 70% by weight of the total amount of conductive material.
- the content of the conductive material formed in the first form is too small, it is not possible to sufficiently secure conductivity between active materials, and in particular, it is not possible to solve the problem that the conductivity of the active material is lowered due to volume expansion according to the cycle progress. In many cases, the content of the conductive material present on the surface of the active material is relatively reduced, which is undesirable because sufficient conductivity with the current collector cannot be secured.
- a manufacturing method to have both the first shape and the second shape will be described below.
- the diameter of the single-walled carbon nanotubes may be 1 nm to 3 nm, specifically 1 nm to 2 nm.
- the average diameter is out of the above range and is too small, the dispersed carbon nanotubes are buried between the negative electrode active material particles, making it difficult to form sufficient pores.
- the length of the single-walled carbon nanotubes is not particularly limited, but the length of the single-walled carbon nanotubes may be 1 ⁇ m to 7 ⁇ m, specifically 2 ⁇ m to 5 ⁇ m.
- the diameter and length can be measured by AFM (Atomic Force Microscopy).
- the aspect ratio (length/diameter) of the single-walled carbon nanotubes which is defined as the ratio of the diameter and length of the single-walled carbon nanotubes, may be 500 to 7000, and specifically 1000 to 5000.
- the single-walled carbon nanotubes may generally exist in the form of a plurality of these single-walled carbon nanotubes, and may be aggregated in an entangled or bundled form according to the shape to have a secondary shape, but in detail It may have a secondary shape assembled in a bundle type.
- the 'bundle type' refers to a secondary shape in the form of a bundle or rope in which a plurality of carbon nanotubes are arranged side by side or spirally twisted, unless otherwise specified.
- 'Entangled type' means a form in which a plurality of carbon nanotubes are not limited to a specific orientation and are entangled.
- the shape may be prepared by varying the temperature in order to produce the desired shape of the carbon nanotube.
- the carbon nanotubes of the entangled structure have a lumpy structure and are similar to the intermediate shape of the point-like conductive material and the carbon nanotubes of the bundled structure, it is disadvantageous to form a network structure, whereas the bundled structure has a predetermined number of carbon atoms. Since the strands exist apart from each other by a distance, it is easier to transfer electrons, so it is more preferable to have a bundled structure when it is necessary to secure conductivity according to the present invention.
- the specific surface area of the single-walled carbon nanotube having such a secondary shape may be 800 to 1400 m 2 /g, specifically 1000 to 1200 m 2 /g.
- This specific surface area represents the BET specific surface area, which is measured by the BET method, and can be specifically calculated from the nitrogen gas adsorption amount under the liquid nitrogen temperature (77K) using BEL Japan's BELSORP-mino II. there is.
- the conductive material may be included in an amount of 0.01 to 10 wt%, specifically, 0.05 to 1 wt%, and more specifically, 0.05 to 0.2 wt%, based on the total weight of the negative electrode mixture.
- the anode active material may include other known active materials in addition to the silicon-based active material.
- carbon such as non-graphitizing carbon and graphite-based carbon
- graphite-based carbon may be mixed.
- the silicon-based active material may be included in an amount of 1 wt% to 20 wt%, specifically 5 wt% to 10 wt%, based on the total weight of the negative electrode active material.
- the negative electrode mixture may further include a binder and a dispersant.
- the binder is not limited as long as it is a component that assists in the binding of the active material and the conductive material and the binding to the current collector, and examples thereof include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydrogel Roxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butadiene rubber, fluoro rubber , various copolymers, etc., respectively.
- polyvinylidene fluoride polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydrogel Roxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM),
- the binder may be included in an amount of 0.1 to 30 wt%, specifically, 0.5 to 10 wt%, and more specifically, 1 to 5 wt%, based on the total weight of the negative electrode mixture.
- the dispersant is not limited as long as it is conventionally known in the art, but is carboxymethylcellulose (CMC), polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic acid, acrylonitrile-butadiene rubber, and styrene-ethylene oxide. It may be one or more materials selected from the group consisting of, and in detail, it may be a mixture of acrylonitrile-butadiene rubber and styrene-ethylene oxide.
- CMC carboxymethylcellulose
- polyvinylpyrrolidone polyvinyl alcohol
- polyacrylic acid acrylonitrile-butadiene rubber
- styrene-ethylene oxide styrene-ethylene oxide
- the dispersant may be included in an amount of 0.01 to 5% by weight, specifically, 0.05 to 1% by weight, and more specifically, 0.05 to 0.5% by weight, based on the total weight of the negative electrode mixture.
- the anode current collector is not particularly limited as long as the current collector does not cause chemical change in the battery and has high conductivity.
- the current collector does not cause chemical change in the battery and has high conductivity.
- Surface treatment of carbon, nickel, titanium, silver, etc. on the surface of steel may be used.
- the current collector may also form fine irregularities on its surface to increase adhesion of the negative electrode active material, and various forms such as films, sheets, foils, nets, porous materials, foams, and non-woven fabrics are possible.
- anode active material slurry including an active material and a conductive material composed of single-walled carbon nanotubes (SWCNTs)
- a method for manufacturing a negative electrode in which the conductive material of the single-walled carbon nanotubes is separately introduced is provided.
- the negative electrode active material slurry may further include a binder, and the divided input is 30% to 60% by weight based on the total weight of the conductive material composed of the single-walled carbon nanotubes pre-mixed with the negative electrode active material, , The remaining 40% to 70% by weight of the conductive material composed of the single-walled carbon nanotubes may be additionally added together with a binder and then mixed.
- a conductive material of single-walled carbon nanotubes is mixed with a dispersant in a solvent to prepare a pre-dispersion solution.
- the types of conductive material and dispersant of the single-walled carbon nanotubes are as described above.
- the content ratio of the conductive material and the dispersant may be mixed at 2:1 to 100:1, specifically 5:1 to 20:1, based on weight.
- the solvent is a solvent for preparing an anode active material, and may be used without particular limitation as long as it is generally used in the art. Specifically, dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, or water may be mentioned, and any one or two or more of these may be used. Mixtures may be used.
- the amount of the solvent is used to dissolve or disperse the negative electrode active material, conductive material, dispersant, and binder in consideration of the coating thickness and manufacturing yield of the slurry, and then to have a viscosity capable of exhibiting excellent thickness uniformity during coating for manufacturing a positive electrode. is enough
- an active material solution is prepared by injecting an anode active material into a portion of the pre-dispersed liquid.
- the pre-dispersion used may be 30 wt% to 60 wt% of the pre-dispersion based on the total weight of the prepared pre-dispersion.
- the conductive material of the pre-dispersion liquid is positioned to cover the surface of the negative active material.
- an active material slurry may be prepared by adding the remaining pre-dispersion liquid to the mixed active material solution, adding a binder, and mixing them.
- the amount of the pre-dispersion added is the remainder except for the pre-dispersed pre-dispersion, and may be 40% to 70% by weight based on the total weight of the pre-dispersion.
- the pre-dispersion liquid additionally introduced in step (c) is formed to connect the surfaces of the active material particles to form conductivity between the active materials.
- a pre-dispersion solution in which a conductive material and a dispersant of single-walled carbon nanotubes are mixed is divided into before and after active material mixing, a first form of connecting the surfaces of two or more negative electrode active material particles in an appropriate amount, Since the single-walled carbon nanotubes exist to include all of the second shape covering the surface of each negative electrode active material particle, excellent conductivity can be secured even as the cycle progresses, reducing the increase in resistance and improving lifespan characteristics. can have an effect.
- a positive electrode in which a positive electrode mixture including a positive electrode active material is formed on at least one surface of the positive electrode current collector;
- a secondary battery in which an electrode assembly including a separator interposed between the negative electrode and the positive electrode is embedded in a secondary battery case together with an electrolyte solution,
- the secondary battery is provided with an increase rate of 47% or less in a 100th DCIR value compared to an initial DCIR value.
- the initial DCIR value is obtained by charging the manufactured secondary battery at 0.5C, 4.2 V (cut-off condition) CC/CV, CC discharging at 2.0C, 2.5V (cut-off condition), and charging again to obtain an SOC of 50
- the resistance value is measured by discharging at 2.0C at % for 10 seconds
- the 100th DCIR value is the resistance value by performing 100 times under the above charging and discharging conditions, charging again, and discharging at 2.0C at SOC 50% for 10 seconds. is the measured value of
- the increase rate is 47% or less in the value compared with them.
- the secondary battery may have a retention rate of 100 discharge capacity compared to the initial discharge capacity of 91% or more.
- the initial discharge capacity is the discharge capacity when the manufactured secondary battery is charged at 0.5C, 4.2 V (cut-off condition) CC / CV and CC discharged at 2.0C, 2.5V (cut-off condition), Since the 100-time discharge capacity is the discharge capacity after 100 cycles under the above charging and discharging conditions, the capacity retention rate value can be calculated by expressing (100th discharge capacity/1st discharge capacity) x 100.
- the cathode active material is required for high energy density of a secondary battery
- a cathode active material having a high Ni content and an excess of Ni may be used.
- the cathode active material may include a lithium transition metal oxide represented by Chemical Formula 1 below.
- M is at least one member selected from the group consisting of Cu, Ti, Mg, Al, Pt, and Zr;
- A is an oxygen-substituted halogen
- a may be 0.88 ⁇ a ⁇ 1.
- the lithium transition metal oxide may be a bimodal mixture of large particles and small particles.
- the alleles may have an average diameter (D50) of 10 to 20 ⁇ m, and the small particles may have an average diameter (D50) of 1 to 7 ⁇ m.
- performance can be improved by reducing internal resistance of the electrode by improving the packing density, and performance is improved by maximizing contact between the positive electrode active material and the electrolyte, which is more preferable.
- the bimodal structure refers to a structure in which two distributed mountains appear based on the average diameter distribution of lithium transition metal oxide.
- the lithium transition metal oxide may be included in an amount of 80 wt% to 100 wt% based on the total weight of the cathode active material, and may be 100 wt% in detail.
- the positive current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery, and for example, stainless steel, aluminum, nickel, titanium, calcined carbon, or carbon, nickel, titanium on the surface of aluminum or stainless steel. , or surface-treated with silver or the like may be used.
- the cathode current collector may have a thickness of typically 3 ⁇ m 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 a film, sheet, foil, net, porous material, foam or nonwoven material.
- SWCNT Single-walled carbon nanotube, ANP
- Predispersion A was prepared by mixing the conductive material and carboxymethylcellulose (CMC) as a dispersant in a weight ratio of 1:2 in an N-methylpyrrolidone solvent.
- CMC carboxymethylcellulose
- a pre-dispersion B was prepared by mixing carboxymethylcellulose (CMC) as a dispersing agent in an N-methylpyrrolidone solvent.
- CMC carboxymethylcellulose
- An active material solution was prepared by adding a negative electrode active material in which SiO:graphite was mixed in a weight ratio of 5:95 to 50% by weight of the predispersion A as a negative electrode active material.
- pre-dispersion A was added to the active material solution, and styrene-butadiene rubber (SBR) as a binder and carboxymethylcellulose-sodium (CMC) as a thickener were added and mixed to prepare an active material slurry.
- SBR styrene-butadiene rubber
- CMC carboxymethylcellulose-sodium
- the amount of the negative electrode active material and the binder added was such that the weight ratio of the negative electrode active material, conductive material, dispersant, binder, and thickener in the final active material slurry was 97.2:0.2:0.6:1:1.
- An anode was prepared by applying the prepared active material slurry to a 10 ⁇ m copper current collector at a loading amount of 10 mg/cm 2 .
- Example 1 the negative electrode was prepared in the same manner as in Example 1 except that an active material solution was prepared by adding the negative active material to 100% by weight of the pre-dispersion A, and then mixing the pre-dispersion B.
- Example 1 the negative electrode was prepared in the same manner as in Example 1, except that the negative electrode active material was added to the pre-dispersion B, and 100% by weight of the pre-dispersion A was additionally mixed after the negative electrode active material was added.
- SWCNT Single-walled carbon nanotube, ANP
- MWCNT Multi-walled carbon nanotube, ANP
- a pre-dispersion C was prepared by mixing a conductive material in which the SWCNTs and MWCNTs were mixed in a weight ratio of 1:10 and carboxymethylcellulose (CMC) as a dispersant in a weight ratio of 1:1.5 in an N-methylpyrrolidone solvent.
- CMC carboxymethylcellulose
- An anode was prepared in the same manner as in Example 1, except that an active material solution was prepared by adding an anode active material to 100% by weight of the pre-dispersion C, and then mixing the pre-dispersion B.
- the negative electrode according to the present invention connects the active materials and is distributed on all surfaces of the active material, while the negative electrode according to Comparative Example 1 has a conductive material distributed on the surface of the active material. It can be seen that the active materials are not effectively connected, and in the negative electrode according to Comparative Example 2, the conductive material connects the active materials, but the amount distributed on the surface is extremely small.
- LiNi 0.88 Co 0.07 Mn 0.04 Al 0.01 O 2 as a cathode active material
- the SWCNT as a conductive material
- PVdF as a binder
- HPD hematoporphyrin derivative
- a composition for forming a cathode was prepared by mixing at a ratio of 98.5:0.05:1.37:0.08, and the composition was applied to an aluminum current collector in a loading amount of 18 mg/cm 2 to prepare a cathode.
- Example 1 Between the negative electrodes prepared in Example 1 and Comparative Examples 1 to 3 and the positive electrode, a polyethylene separator (thickness: 15 um) was interposed, and then the ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC) in a volume ratio of 20:10:70, and an electrolyte solution containing 1M of 1.3M LiPF 6 in the total amount of the electrolyte was injected to prepare a secondary battery.
- EC ethylene carbonate
- EMC ethyl methyl carbonate
- DMC dimethyl carbonate
- the manufactured secondary batteries were charged at 0.5C, 4.2 V (cut-off condition) CC/CV and discharged at 2.0C, 2.5V (cut-off condition) CC, and then recharged to 2.0C at 50% SOC for 10
- the resistance value was measured by performing an initial discharge, and the resistance value according to the cycle was calculated at an increasing rate compared to the resistance value of the first cycle, and the results are shown in FIGS. 4 to 7 below.
- the resistance increase rate is about 43.4%, whereas in the case of Comparative Examples 1 and 2, it can be seen that the resistance increase rate exceeds 47%, and the MWCNT Even in the case of use, when proceeding with one-time input, it can be confirmed that the resistance increase rate is similar to that of Comparative Example 1 because sufficient conductivity between active materials cannot be secured.
- Example 1 and Comparative Examples 1 to 3 While the secondary batteries prepared in Example 1 and Comparative Examples 1 to 3 were charged at 0.5C, 4.2 V (cut-off condition) CC/CV and CC discharged at 2.0C, 2.5V (cut-off condition), the discharge capacity was increased. It was measured, and the discharge capacity retention rate according to each cycle compared to the initial discharge capacity was set as (100th discharge capacity / 1st discharge capacity) x 100, and the results are shown in FIGS. 4 to 7 below.
- Example 1 according to the present invention exhibits an excellent capacity retention rate of 91% or more, whereas Comparative Examples 1 to 3 have a capacity retention rate lower than that of the present invention, which indicates that the cycle As progress progresses, the gap can be expected to widen.
- the negative electrode according to an embodiment of the present invention includes single-walled carbon nanotubes (SWCNTs) as a conductive material, thereby securing excellent conductivity even when the cycle progresses, thereby preventing an increase in resistance of a secondary battery including the negative electrode. It is reduced, and there is an effect of improving life characteristics.
- SWCNTs single-walled carbon nanotubes
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
Description
Claims (15)
- 음극 집전체의 적어도 일면에 음극 합제가 형성되어 있는 이차전지용 음극으로서,상기 음극 합제는 음극 활물질, 및 도전재를 포함하고,상기 음극 활물질은 실리콘계 활물질을 포함하며,상기 도전재는 단일벽 탄소나노튜브(SWCNT, Single-walled Carbon nanotube)로 구성된 음극.
- 제1항에 있어서,상기 단일벽 탄소나노튜브는 둘 이상의 음극 활물질 입자들의 표면을 연결하는 제1 형태와, 각각의 음극 활물질 입자의 표면을 덮는 제2 형태로 포함되는 음극.
- 제2항에 있어서,상기 제1 형태로 형성되는 도전재의 함량은 전체 도전재의 함량의 40중량% 내지 70중량%인 음극.
- 제1항에 있어서,상기 단일벽 탄소나노튜브의 직경은 1nm 내지 2nm 음극.
- 제1항에 있어서,상기 단일벽 탄소나노튜브의 길이는 2㎛ 내지 5㎛인 음극.
- 제1항에 있어서,상기 단일벽 탄소나노튜브의 종횡비는 1000 내지 5000인 음극.
- 제1항에 있어서,상기 단일벽 탄소나노튜브는 번들형으로 집합되어 2차 형상을 가지는 음극.
- 제1항에 있어서,상기 음극 합제는 바인더, 및 분산제를 더 포함하는 음극.
- 제1항에 따른 이차전지용 음극을 제조하는 방법으로서,활물질, 단일벽 탄소나노튜브(SWCNT, Single-walled Carbon nanotube)로 구성된 도전재를 포함하는 음극 활물질 슬러리를 제조할 때, 단일벽 탄소나노튜브의 도전재는 분할 투입되는 음극의 제조방법.
- 제9항에 있어서,상기 음극 활물질 슬러리는 바인더를 더 포함하며, 상기 단일벽 탄소나노튜브로 구성되는 도전재 전체 중량을 기준으로 30 중량% 내지 60중량%는 음극 활물질과 선혼합되고, 상기 단일벽 탄소나노튜브로 구성되는 도전재의 나머지 40중량% 내지 70중량%가 바인더와 함께 추가 투입되어 후혼합되는 음극의 제조방법.
- 제9항에 있어서,상기 음극의 제조방법은,(a) 단일벽 탄소나노튜브(SWCNT, Single-walled Carbon nanotube)의 도전재를 분산제와 용매 하에서 혼합하여 선분산액을 제조하는 단계;(b) 상기 선분산액의 일부에 음극 활물질을 투입하여 활물질 용액을 제조하는 단계;(c) 상기 활물질 용액에 나머지 선분산액을 투입하고, 바인더를 투입하여 활물질 슬러리를 제조하는 단계; 및(d) 상기 활물질 슬러리를 음극 집전체의 적어도 일면에 도포하고, 건조, 및 압연하여 음극을 제조하는 단계;를 포함하는 음극의 제조방법.
- 제11항에 있어서,상기 단계 (b)에서 선분산액 전체 중량을 기준으로 30 중량% 내지 60중량%의 선분산액에 음극 활물질을 투입하고, 단계 (c)에서 선분산액 전체 중량을 기준으로 40중량% 내지 70중량%의 나머지 선분산액을 투입하는 음극의 제조방법.
- 제1항에 따른 음극;양극 집전체의 적어도 일면에 양극 활물질을 포함하는 양극 합제가 형성된 양극;상기 음극 및 상기 양극 사이에 개재되는 분리막을 포함하는 전극조립체가 전해액과 함께 이차전지 케이스에 내장되는 이차전지이며,상기 이차전지는 초회 DCIR 값 대비 100회 DCIR 값의 증가율이 47% 이하인 이차전지.
- 제13항에 있어서,상기 이차전지는 초회 방전용량 대비 100회 방전용량의 유지율이 91% 이상인 이차전지.
- 제13항에 있어서,상기 양극 활물질은 하기 화학식 1로 표현되는 리튬 전이금속 산화물을 포함하는 이차전지:Li1+xNiaCobMncM1-(a+b+c)O2-yAy (1)상기 식에서,M은 Cu, Ti, Mg, Al, Pt, 및 Zr로 이루어진 군에서 선택되는 적어도 1종이고,A는 산소 치환형 할로겐이며,0≤x≤0.5, 0.8≤a≤1, 0≤b≤0.2, 0≤c≤0.2, 0.9≤a+b+c≤1, 및 0≤y≤0.001이다.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023553370A JP2024512901A (ja) | 2021-11-01 | 2022-11-01 | 単一壁炭素ナノチューブが適用された負極およびそれを含む二次電池 |
CN202280019403.3A CN116964771A (zh) | 2021-11-01 | 2022-11-01 | 具有单壁碳纳米管的负极及包含该负极的二次电池 |
EP22887767.6A EP4287303A1 (en) | 2021-11-01 | 2022-11-01 | Negative electrode with single-walled carbon nanotubes and secondary battery comprising same |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2021-0148229 | 2021-11-01 | ||
KR20210148229 | 2021-11-01 | ||
KR10-2022-0142922 | 2022-10-31 | ||
KR1020220142922A KR20230065391A (ko) | 2021-11-01 | 2022-10-31 | 단일벽 탄소나노튜브가 적용된 음극 및 이를 포함하는 이차전지 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023075573A1 true WO2023075573A1 (ko) | 2023-05-04 |
Family
ID=86158361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2022/016940 WO2023075573A1 (ko) | 2021-11-01 | 2022-11-01 | 단일벽 탄소나노튜브가 적용된 음극 및 이를 포함하는 이차전지 |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4287303A1 (ko) |
JP (1) | JP2024512901A (ko) |
WO (1) | WO2023075573A1 (ko) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007066745A (ja) * | 2005-08-31 | 2007-03-15 | Sony Corp | 正極活物質、正極および電池 |
KR20090078656A (ko) * | 2008-01-15 | 2009-07-20 | 삼성전자주식회사 | 전극, 리튬 전지, 전극 제조 방법 및 전극 코팅용 조성물 |
KR20170047095A (ko) * | 2015-10-22 | 2017-05-04 | 삼성전자주식회사 | 전극 활물질, 이를 포함하는 전극 및 이차전지, 및 상기 전극 활물질의 제조방법 |
JP2018101623A (ja) * | 2016-12-20 | 2018-06-28 | 三洋化成工業株式会社 | リチウムイオン電池用負極及びリチウムイオン電池 |
KR20200027787A (ko) * | 2018-09-05 | 2020-03-13 | 주식회사 엘지화학 | 음극 및 이를 포함하는 이차전지 |
-
2022
- 2022-11-01 WO PCT/KR2022/016940 patent/WO2023075573A1/ko active Application Filing
- 2022-11-01 EP EP22887767.6A patent/EP4287303A1/en active Pending
- 2022-11-01 JP JP2023553370A patent/JP2024512901A/ja active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007066745A (ja) * | 2005-08-31 | 2007-03-15 | Sony Corp | 正極活物質、正極および電池 |
KR20090078656A (ko) * | 2008-01-15 | 2009-07-20 | 삼성전자주식회사 | 전극, 리튬 전지, 전극 제조 방법 및 전극 코팅용 조성물 |
KR20170047095A (ko) * | 2015-10-22 | 2017-05-04 | 삼성전자주식회사 | 전극 활물질, 이를 포함하는 전극 및 이차전지, 및 상기 전극 활물질의 제조방법 |
JP2018101623A (ja) * | 2016-12-20 | 2018-06-28 | 三洋化成工業株式会社 | リチウムイオン電池用負極及びリチウムイオン電池 |
KR20200027787A (ko) * | 2018-09-05 | 2020-03-13 | 주식회사 엘지화학 | 음극 및 이를 포함하는 이차전지 |
Also Published As
Publication number | Publication date |
---|---|
EP4287303A1 (en) | 2023-12-06 |
JP2024512901A (ja) | 2024-03-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2019103460A1 (ko) | 이차전지용 양극재 및 이를 포함하는 리튬 이차전지 | |
WO2021029652A1 (ko) | 리튬 이차전지용 양극 및 이를 포함하는 리튬 이차전지 | |
WO2019164319A1 (ko) | 리튬 이차전지용 음극, 이의 제조방법 및 상기 리튬 이차전지용 음극을 포함하는 리튬 이차전지 | |
WO2019182364A1 (ko) | 리튬-함유 복합체의 코팅층을 구비한 세퍼레이터, 이를 포함하는 리튬 이차전지 및 상기 이차전지의 제조방법 | |
WO2019050282A1 (ko) | 리튬 이차전지용 양극 활물질, 이의 제조 방법, 이를 포함하는 리튬 이차전지용 양극 및 리튬 이차전지 | |
WO2020122497A1 (ko) | 리튬 이차전지용 양극재, 이를 포함하는 양극 및 리튬 이차전지 | |
WO2019078702A2 (ko) | 음극 활물질 및 이를 포함하는 전고체 전지용 음극 | |
WO2021066554A1 (ko) | 전극 및 이를 포함하는 이차 전지 | |
WO2020262890A1 (ko) | 음극 및 이를 포함하는 이차전지 | |
WO2020185014A1 (ko) | 음극 및 이를 포함하는 이차전지 | |
WO2021101188A1 (ko) | 음극 및 이를 포함하는 이차전지 | |
WO2014204278A1 (ko) | 리튬 이차전지용 고용량 전극 활물질 및 이를 사용한 리튬 이차전지 | |
WO2016148441A1 (ko) | 리튬 금속 산화물 및 이를 포함하는 리튬 이차전지용 음극 활물질, 및 이의 제조방법 | |
WO2021187907A1 (ko) | 리튬 이차전지용 양극재, 이를 포함하는 양극 및 리튬 이차전지 | |
WO2019107752A1 (ko) | 황-탄소 복합체, 그의 제조방법 및 이를 포함하는 리튬 이차전지 | |
WO2021025349A1 (ko) | 음극, 이의 제조방법 및 이를 포함하는 이차전지 | |
WO2019066129A2 (ko) | 복합음극활물질, 이의 제조 방법 및 이를 포함하는 음극을 구비한 리튬이차전지 | |
WO2021251663A1 (ko) | 음극 및 이를 포함하는 이차전지 | |
WO2022045852A1 (ko) | 음극 및 상기 음극을 포함하는 이차 전지 | |
WO2022060138A1 (ko) | 음극 및 이를 포함하는 이차전지 | |
WO2020256440A1 (ko) | 복합 음극, 및 상기 복합 음극을 포함한 리튬 이차 전지 | |
WO2024085297A1 (ko) | 음극 활물질, 이를 포함하는 음극 및 리튬 이차전지 | |
WO2022191639A1 (ko) | 복합양극활물질, 이를 채용한 양극과 리튬전지 및 그 제조방법 | |
WO2022139452A1 (ko) | 리튬 이차전지용 양극의 제조 방법 및 이에 의하여 제조된 리튬 이차전지용 양극 | |
WO2019078685A2 (ko) | 리튬 이차전지용 양극 활물질, 이의 제조방법, 이를 포함하는 리튬 이차전지용 양극 및 리튬 이차전지 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22887767 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022887767 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023553370 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280019403.3 Country of ref document: CN |
|
ENP | Entry into the national phase |
Ref document number: 2022887767 Country of ref document: EP Effective date: 20230828 |