KR20010046245A - Active material composition for lithium secondary battery and lithium secondary battery manufactured using the same - Google Patents
Active material composition for lithium secondary battery and lithium secondary battery manufactured using the same Download PDFInfo
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- KR20010046245A KR20010046245A KR1019990049941A KR19990049941A KR20010046245A KR 20010046245 A KR20010046245 A KR 20010046245A KR 1019990049941 A KR1019990049941 A KR 1019990049941A KR 19990049941 A KR19990049941 A KR 19990049941A KR 20010046245 A KR20010046245 A KR 20010046245A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 40
- 239000000203 mixture Substances 0.000 title claims abstract description 39
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000011149 active material Substances 0.000 title claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000006258 conductive agent Substances 0.000 claims abstract description 20
- 239000006183 anode active material Substances 0.000 claims abstract description 13
- 239000006182 cathode active material Substances 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 239000003792 electrolyte Substances 0.000 claims abstract description 8
- 239000002904 solvent Substances 0.000 claims abstract description 7
- 239000006230 acetylene black Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000011244 liquid electrolyte Substances 0.000 claims description 3
- 239000005518 polymer electrolyte Substances 0.000 claims description 2
- 230000007423 decrease Effects 0.000 abstract description 4
- 238000000354 decomposition reaction Methods 0.000 abstract description 3
- 230000005856 abnormality Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000001771 impaired effect Effects 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 10
- 229910001416 lithium ion Inorganic materials 0.000 description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 229910000733 Li alloy Inorganic materials 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 239000001989 lithium alloy Substances 0.000 description 3
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 2
- 229920006370 Kynar Polymers 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 2
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920005569 poly(vinylidene fluoride-co-hexafluoropropylene) Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- UKGJZDSUJSPAJL-YPUOHESYSA-N (e)-n-[(1r)-1-[3,5-difluoro-4-(methanesulfonamido)phenyl]ethyl]-3-[2-propyl-6-(trifluoromethyl)pyridin-3-yl]prop-2-enamide Chemical compound CCCC1=NC(C(F)(F)F)=CC=C1\C=C\C(=O)N[C@H](C)C1=CC(F)=C(NS(C)(=O)=O)C(F)=C1 UKGJZDSUJSPAJL-YPUOHESYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical compound [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 description 1
- URIIGZKXFBNRAU-UHFFFAOYSA-N lithium;oxonickel Chemical compound [Li].[Ni]=O URIIGZKXFBNRAU-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
본 발명은 캐소드 활물질 또는 애노드 활물질, 도전제, 결합제 및 용매를 포함하는 리튬 2차전지용 활물질 조성물에 있어서, 상기 도전제가 탄소 분말과 그라파이트 분말의 1:1∼5:1 (중량비) 혼합물이고 상기 도전제의 함량이 상기 활물질 조성물의 총중량에 대하여 1∼10중량인 것을 특징으로 하는 리튬 2차전지용 활물질 조성물 및 이를 이용하여 제조된 리튬 2차전지에 관한 것이다. 본 발명에 따르면, 리튬 2차전지용 활물질 조성물의 결합제로서 통상 사용되는 탄소 분말의 일부를 도전성이 우수하면서 비표면적이 작은 그라파이트 분말로 대체하여 극판의 밀도를 증가시키고 전지의 에너지 밀도, 전도성 및 고율 특성을 개선한다. 또한, 전해액과의 반응 사이트가 감소함에 따라 전지 이상에 의해 전해액의 분해 반응이 일어나더도 전지의 안정성이 크게 저해되는 일이 없다.The present invention relates to an active material composition for a lithium secondary battery including a cathode active material or an anode active material, a conductive agent, a binder, and a solvent, wherein the conductive agent is a 1: 1 to 5: 1 (weight ratio) mixture of carbon powder and graphite powder, and the conductive The amount of the agent relates to an active material composition for a lithium secondary battery, and a lithium secondary battery manufactured using the same, wherein the content of the agent is 1 to 10 weight based on the total weight of the active material composition. According to the present invention, a portion of the carbon powder commonly used as a binder of the active material composition for lithium secondary batteries is replaced with graphite powder having excellent conductivity and small specific surface area, thereby increasing the density of the electrode plate and improving the energy density, conductivity and high rate characteristics of the battery. To improve. Further, as the reaction site with the electrolyte decreases, even if the decomposition reaction of the electrolyte occurs due to battery abnormality, the stability of the battery is not significantly impaired.
Description
본 발명은 리튬 2차전지용 활물질 조성물 및 그를 이용하여 제조된 리튬 2차전지에 관한 것으로서, 보다 상세하게는 우수한 극판 밀도와 전도성을 제공할 수 있는 리튬 2차전지용 활물질 조성물 및 그를 이용하여 제조되어 에너지 밀도 및 고율 특성이 개선된 리튬 2차전지에 관한 것이다.The present invention relates to an active material composition for a lithium secondary battery and a lithium secondary battery manufactured using the same, and more particularly, to an active material composition for a lithium secondary battery capable of providing excellent electrode plate density and conductivity, and manufactured using the energy The present invention relates to a lithium secondary battery having improved density and high rate characteristics.
리튬 2차전지는 전해질의 종류에 따라서 액체 전해질을 사용하는 리튬 이온 전지와 고체형 전해질을 사용하는 리튬 이온 폴리머 전지로 나눌 수 있다. 이중, 리튬 이온 전지는 납축전지, Ni/Cd 전지등과 같은 기존의 전지에 비해 전지의 용량이 상당히 개선되기는 하였으나 안정성 및 충방전 수명특성은 여전히 불완전하다. 이러한 리튬 이온 전지의 문제점을 보완한 것이 리튬 이온 폴리머 전지인데, 리튬 리튬 이온 폴리머 전지는 고체형 전해질을 사용하므로 전해액이 누출될 염려가 적어 리튬 이온 전지에 비해 안전하며, 무게가 가볍고 부피가 적으며 자체 방전율도 아주 작다. 또한, 가공성이 우수하여 각형 및 대형 전지로 제작하기가 용이하다.Lithium secondary batteries can be divided into lithium ion batteries using liquid electrolytes and lithium ion polymer batteries using solid electrolytes, depending on the type of electrolyte. Among the lithium ion batteries, the capacity of the batteries is considerably improved compared to conventional batteries such as lead acid batteries and Ni / Cd batteries, but the stability and charge / discharge life characteristics are still incomplete. Complementing the problem of the lithium ion battery is a lithium ion polymer battery, which uses a solid electrolyte, so there is little risk of leakage of electrolyte solution, which is safer than a lithium ion battery, and is light in weight and small in volume. The self discharge rate is also very small. In addition, the processability is excellent, and it is easy to manufacture a square and a large battery.
한편, 리튬 2차전지는 통상적으로 캐소드, 세퍼레이타 및 애노드를 포함하여 이루어진다. 이 때 상기 캐소드와 애노드는 각각의 집전체 상부에 리튬 2차전지용 활물질 조성물을 도포하여 활물질층을 형성함으로써 제조된다. 이렇게 얻어진 캐소드, 애노드 및 세퍼레이타를 열 또는 압력을 이용하여 라미네이팅함으로써 형성된다.On the other hand, a lithium secondary battery typically comprises a cathode, a separator and an anode. In this case, the cathode and the anode are prepared by applying an active material composition for a lithium secondary battery on each current collector to form an active material layer. The cathodes, anodes and separators thus obtained are formed by laminating using heat or pressure.
통상, 리튬 2차전지용 활물질 조성물은 캐소드 활물질 또는 애노드 활물질, 도전제, 결합제 및 용매를 포함하는데, 이때 캐소드 활물질로는 리튬복합산화물이 사용되고 애노드 활물질로는 리튬금속, 리튬합금 또는 탄소재 물질이 통상 사용되며, 결합제로는 본 발명의 분야에서 사용되는 것이 통상 사용된다.In general, an active material composition for a lithium secondary battery includes a cathode active material or an anode active material, a conductive agent, a binder, and a solvent, wherein a lithium composite oxide is used as the cathode active material, and a lithium metal, a lithium alloy, or a carbonaceous material is typically used as the anode active material. As the binder, those used in the field of the present invention are usually used.
한편, 도전제로는 통상 카본블랙이나 아세틸렌블랙과 같은 탄소분말이 사용된다. 그러나, 탄소분말은 비표면적이 너무 커서 극판의 밀도가 떨어지며 과충전시에는 전해액 분해반응의 사이트로 작용함으로써 안전성 문제를 야기시킬 수 있다.On the other hand, a carbon powder such as carbon black or acetylene black is usually used as the conductive agent. However, the carbon powder has a large specific surface area, which causes a decrease in the density of the electrode plate, and may cause a safety problem by acting as a site for electrolyte decomposition during overcharging.
또한, 리튬 2차전지용 활물질 조성물 제조시 혼합과정에서 탄소분말의 분산이 균일하게 이루어지지 않게 되면 충분한 도전성 향상 효과를 기대할 수 없을 뿐 아니라 오히려 전지의 수명열화를 촉진한다는 문제점이 있다.In addition, when the dispersion of the carbon powder is not uniformly made during the mixing process during the preparation of the active material composition for lithium secondary battery, there is a problem in that it is not possible to expect a sufficient conductivity improvement effect, but rather promote the deterioration of battery life.
본 발명이 이루고자 하는 기술적 과제는 극판 밀도 및 도전성을 향상시킬 수 있는 리튬 2차전지용 활물질 조성물을 제공하는 것이다.The technical problem to be achieved by the present invention is to provide an active material composition for a lithium secondary battery that can improve the electrode plate density and conductivity.
본 발명이 이루고자 하는 다른 기술적 과제는 에너지 밀도가 높고 고율특성이 개선된 리튬 2차전지를 제공하는 것이다.Another object of the present invention is to provide a lithium secondary battery having high energy density and improved high rate characteristics.
본 발명의 기술적 과제는 캐소드 활물질 또는 애노드 활물질, 도전제, 결합제 및 용매를 포함하는 리튬 2차전지용 활물질 조성물에 있어서, 상기 도전제가 탄소 분말과 그라파이트 분말의 1:1∼5:1 (중량비) 혼합물이고 상기 도전제의 함량이 상기 활물질 조성물의 총중량에 대하여 1∼10중량인 것을 특징으로 하는 리튬 2차전지용 활물질 조성물에 의하여 이루어질 수 있다.SUMMARY OF THE INVENTION The present invention provides a lithium secondary battery active material composition including a cathode active material or an anode active material, a conductive agent, a binder, and a solvent, wherein the conductive agent is a 1: 1 to 5: 1 (weight ratio) mixture of carbon powder and graphite powder And the content of the conductive agent may be made by the active material composition for lithium secondary battery, characterized in that 1 to 10% by weight relative to the total weight of the active material composition.
본 발명의 다른 기술적 과제는 활물질, 도전제 및 결합제를 포함하는 전극판 및 액체 전해액 또는 고분자 전해질로부터 선택된 전해질을 포함하는 리튬 2차전지에 있어서, 상기 도전제가 탄소 분말과 그라파이트 분말의 1:1∼5:1 혼합물이고 상기 도전제의 함량이 상기 활물질 조성물의 총중량에 대하여 1∼10중량인 것을 특징으로 하는 리튬 2차전지에 의하여 이루어질 수 있다.Another technical problem of the present invention is a lithium secondary battery including an electrode plate including an active material, a conductive agent and a binder, and an electrolyte selected from a liquid electrolyte or a polymer electrolyte, wherein the conductive agent is 1: 1 to carbon powder and graphite powder. It is a 5: 1 mixture and the content of the conductive agent may be made by a lithium secondary battery, characterized in that 1 to 10% by weight relative to the total weight of the active material composition.
본 발명에 있어서, 상기 캐소드 활물질, 애노드 활물질, 결합제 및 용매로는 본 발명의 분야에서 통상적으로 사용되는 것이면 특별히 제한되지 않는다. 보다 구체적으로 언급하면, 캐소드 활물질로는 리튬망간옥사이드, 리튬코발트옥사이드 또는 리튬니켈옥사이드와 같은 리튬복합산화물이 사용된다. 또한, 애노드 활물질로는 리튬금속, 리튬합금 또는 탄소재 물질이 사용될 수 있는데, 리튬금속, 리튬합금 등이 애노드 활물질로서 채용되는 경우에 더 효과적이다.In the present invention, the cathode active material, the anode active material, the binder and the solvent are not particularly limited as long as they are commonly used in the field of the present invention. More specifically, a lithium composite oxide such as lithium manganese oxide, lithium cobalt oxide or lithium nickel oxide is used as the cathode active material. In addition, a lithium metal, a lithium alloy or a carbonaceous material may be used as the anode active material, which is more effective when a lithium metal, a lithium alloy, or the like is employed as the anode active material.
또한, 결합제로는 비닐리덴디플루오라이드-헥사플루오로프로필렌 공중합체 등의 고분자 화합물이 사용되며 용매로는 메탄올, 에탄올, 이소프로필알콜 등과 같은 알콜류 용매, 증류수 또는 그 혼합용매가 사용될 수 있다.In addition, a high molecular compound such as vinylidene difluoride-hexafluoropropylene copolymer may be used as the binder, and an alcohol solvent such as methanol, ethanol, isopropyl alcohol, distilled water, or a mixed solvent thereof may be used as the solvent.
한편, 상기 탄소 분말은 본 발명의 분야에서 통상적으로 사용되는 카본 블랙, 아세틸렌 블랙 또는 이들의 혼합물이다.On the other hand, the carbon powder is carbon black, acetylene black or a mixture thereof commonly used in the field of the present invention.
또한, 상기 탄소분말과 혼합하여 사용되는 그라파이트 분말은 무정형 입자로서 표면적이 5∼50㎡/g으로서 탄소 분말보다 작으나 전도성이 탄소 분말보다 우수하다는 장점이 있다.In addition, the graphite powder used in admixture with the carbon powder is an amorphous particle having a surface area of 5 to 50 m 2 / g, which is smaller than that of the carbon powder, but has an advantage of better conductivity than the carbon powder.
그러나, 그라파이트 분말의 입자 크기는 통상 10∼30㎛로서 상당히 크기 때문에 그대로 도전제로서 첨가할 경우 활물질 사이에서 충분한 브릿지 역할을 수행할 수 없다. 따라서, 그라파이트 분말의 입경이 최대한 서브 마이크론의 수준에 가깝도록, 바람직하게는 10㎛ 이하, 더 바람직하게는 1∼10㎛이 되도록 분쇄한다. 이렇게 얻어진 그라파이트 입자를 서브 마이크론 단위의 미립자인 탄소분말과 소정의 비율로 혼합하여 도전제로서 사용한다.However, since the particle size of the graphite powder is usually quite large, such as 10 to 30 µm, when it is added as a conductive agent as it is, it cannot function as a sufficient bridge between the active materials. Therefore, it is pulverized so that the particle diameter of graphite powder is as close as possible to the level of submicron, Preferably it is 10 micrometers or less, More preferably, it is 1-10 micrometers. The graphite particles thus obtained are mixed with the carbon powder which is the fine particles of the submicron unit at a predetermined ratio and used as a conductive agent.
본 발명에 따른 그라파이트 분말의 입경이 10㎛를 초과하는 경우에는 활물질 사이에서 브릿지 역할을 충분하게 수행할 수 없기 때문에 오히려 전도성을 저하시키는 원인이 되므로 바람직하지 않다.If the particle size of the graphite powder according to the present invention exceeds 10㎛ it is not preferable because it can not perform a sufficient bridge role between the active material, rather it causes a decrease in conductivity.
본 발명에 따른 탄소 분말과 흑연 분말의 혼합물을 활물질용 도전제로 첨가하면 우수한 도전성을 얻을 수 있음은 물론 극판 밀도를 개선할 수도 있다.When the mixture of the carbon powder and the graphite powder according to the present invention is added as the conductive agent for the active material, excellent conductivity can be obtained and the electrode plate density can be improved.
또한, 탄소 분말과 그라파이트 분말의 혼합물은 탄소 분말만으로 된 종래의 도전제보다도 분산성이 좋기 때문에 전도성 개선효과를 더 좋게 할 수 있다는 잇점도 있다.In addition, since the mixture of the carbon powder and the graphite powder has better dispersibility than the conventional conductive agent composed only of the carbon powder, there is an advantage that the conductivity improvement effect can be improved.
탄소 분말과 그라파이트 분말의 혼합 비율은 전술한 바와 같이 1:1∼5:1인 것이 바람직한데, 혼합 비율이 상기 범위보다 작으면 전도성 개선 효과, 극판 밀도 개선 효과 등이 미흡하므로 바람직하지 않은 반면, 상기 범위를 초과하게 되면 전도성이 오히려 저하되므로 바람직하지 않다.It is preferable that the mixing ratio of the carbon powder and the graphite powder is 1: 1 to 5: 1 as described above. If the mixing ratio is smaller than the above range, the conductivity improvement effect, the electrode plate density improvement effect, and the like are not preferable. It is not preferable to exceed the above range because the conductivity is rather lowered.
이하, 본 발명에 따른 활물질 조성물을 이용하여 리튬 2차전지를 제조하는 방법에 대해 상술하기로 한다.Hereinafter, a method of manufacturing a lithium secondary battery using the active material composition according to the present invention will be described in detail.
먼저, 예를 들면 리튬코발트옥사이드와 같은 리튬복합산화물, 비닐리덴디플루오로라이드-헥사플루오로프로필렌 공중합체, 카본블랙 또는 아세틸렌블랙으로부터 선택된 하나 이상의 탄소분말과 그라파이트 분말의 1:1 혼합물을 10:2:1의 중량비로 혼합한 다음, 이를 아세톤과 혼합하여 캐소드 활물질 조성물을 얻는다.First, a 1: 1 mixture of graphite powder and one or more carbon powders selected from, for example, lithium composite oxides such as lithium cobalt oxide, vinylidenedifluorolide-hexafluoropropylene copolymer, carbon black or acetylene black is 10: After mixing in a weight ratio of 2: 1, it is mixed with acetone to obtain a cathode active material composition.
또한, 리튬복합산화물 대신 적당한 애노드 활물질을 이용하는 것을 제외하고는 캐소드 활물질 조성물 제조시와 동일한 방법으로 애노드 활물질 조성물을 얻는다.In addition, the anode active material composition is obtained in the same manner as in the preparation of the cathode active material composition except that a suitable anode active material is used instead of the lithium composite oxide.
이어서, 캐소드 집전체와 애노드 집전체 상에 상기에서 얻어진 각각의 활물질 조성물을 직접 코팅하거나 캐스팅하여 캐소드와 애노드를 제조한다. 이렇게 얻어진 캐소드와 애노드에 세퍼레이타를 개재한 다음, 실리콘 고무 재질 또는 스테인레스 핫 롤로 라미네이팅한다.Subsequently, each of the active material compositions obtained above is directly coated or cast on the cathode current collector and the anode current collector to prepare a cathode and an anode. The separator and the anode thus obtained are interposed with a separator and then laminated with a silicon rubber material or a stainless hot roll.
마지막으로, 상기 결과물을 활성화공정, 탭용접공정 및 패키징공정을 거침으로써 리튬 이온 전지 또는 리튬 이온 폴리머 전지를 완성한다.Finally, the resultant is subjected to an activation process, a tap welding process and a packaging process to complete a lithium ion battery or a lithium ion polymer battery.
이하, 본 발명을 하기 실시예를 들어 설명하기로 하되, 본 발명이 하기 실시예로만 한정되는 것은 아니다.Hereinafter, the present invention will be described with reference to the following examples, but the present invention is not limited only to the following examples.
실시예Example
LiCoO260g, PVdF-HFP 공중합체 (상품명: KYNAR 2801) 10g, 아세틸렌블랙 4g, 평균 입경이 5㎛인 그라파이트 분말 4g을 100㎖의 아세톤과 혼합하여 캐소드 활물질 조성물을 제조한 다음, 캐스팅하여 캐소드 활물질 필름을 제조하였다.60 g of LiCoO 2 , PVdF-HFP copolymer (trade name: KYNAR 2801), 4 g of acetylene black, and 4 g of graphite powder having an average particle diameter of 5 μm were mixed with 100 ml of acetone to prepare a cathode active material composition, followed by casting to produce a cathode active material. A film was prepared.
다음으로, MCF 분말 60g, PVdF-HFP 공중합체 (상품명: KYNAR 2801) 15g, 아세틸렌블랙 2.5g, 평균 입경이 5㎛인 그라파이트 분말 2.5g을 150㎖의 아세톤과 혼합하여 애노드 활물질 조성물을 제조한 다음, 캐스팅하여 애노드 활물질 필름을 제조하였다.Next, an anode active material composition was prepared by mixing 60 g of MCF powder, 15 g of PVdF-HFP copolymer (trade name: KYNAR 2801), 2.5 g of acetylene black, and 2.5 g of graphite powder having an average particle diameter of 5 µm with 150 ml of acetone. , And cast to prepare an anode active material film.
계속해서, 알루미늄 집전체 및 구리 집전체 상에 상기에서 제조된 캐소드 활물질 필름 및 애노드 활물질 필름을 각각 열융착시켜 캐소드 극판 및 애노드 극판을 각각 제조하였다.Subsequently, the cathode active material film and the anode active material film prepared above were heat-sealed on the aluminum current collector and the copper current collector, respectively, to produce a cathode electrode plate and an anode electrode plate, respectively.
이렇게 제조된 각각의 전극판 사이에 세퍼레이터를 개재한 다음, 열융착시켜서 리튬 이온 폴리머 전지 샘플을 제조하였다.A lithium ion polymer battery sample was prepared by interposing a separator between the electrode plates thus prepared, followed by thermal fusion.
얻어진 단위셀의 에너지 밀도, 충방전 특성, 고율 특성을 평가하여 그 결과를 하기 표 1에 나타내었다.The energy density, charge and discharge characteristics, and high rate characteristics of the obtained unit cell were evaluated, and the results are shown in Table 1 below.
비교예Comparative example
흑연계 탄소분말을 첨가하지 않는 대신 아세틸렌블랙의 함량을 8g으로 하는 것을 제외하고는 실시예에서와 동일한 방법에 따라서 캐소드 극판을 얻었다.A cathode electrode plate was obtained in the same manner as in Example except that the content of acetylene black was 8 g instead of the graphite carbon powder.
또한, 흑연계 탄소분말을 첨가하지 않는 대신 아세틸렌블랙의 함량을 5g으로 하는 것을 제외하고는 실시예에서와 동일한 방법에 따라서 애노드 극판을 얻었다.In addition, an anode plate was obtained in the same manner as in Example except that the content of acetylene black was 5g instead of the graphite-based carbon powder.
얻어진 캐소드 극판 및 애노드 극판을 이용하여 실시예에서와 동일한 방법으로 리튬 이온 폴리머 전지 샘플을 제조하였다.A lithium ion polymer battery sample was prepared in the same manner as in Example using the obtained cathode electrode plate and anode electrode plate.
얻어진 단위셀의 에너지 밀도, 충방전 특성, 고율 특성을 평가하여 그 결과를 하기 표 1에 나타내었다.The energy density, charge and discharge characteristics, and high rate characteristics of the obtained unit cell were evaluated, and the results are shown in Table 1 below.
상기 표 1의 결과로부터 본 발명에 따른 리튬 2차 전지가 에너지 밀도, 전지 특성 면에서 더 우수하다는 것을 알 수 있다.From the results of Table 1, it can be seen that the lithium secondary battery according to the present invention is more excellent in terms of energy density and battery characteristics.
본 발명에 따르면, 리튬 2차전지용 활물질 조성물의 결합제로서 통상 사용되는 탄소 분말의 일부를 도전성이 우수하면서 비표면적이 작은 그라파이트 분말로 대체하여 극판의 밀도를 증가시키고 전지의 에너지 밀도, 전도성 및 고율 특성을 개선한다. 또한, 전해액과의 반응 사이트가 감소함에 따라 전지 이상에 의해 전해액의 분해 반응이 일어나더도 전지의 안정성이 크게 저해되는 일이 없다.According to the present invention, a portion of the carbon powder commonly used as a binder of the active material composition for lithium secondary batteries is replaced with graphite powder having excellent conductivity and small specific surface area, thereby increasing the density of the electrode plate and improving the energy density, conductivity and high rate characteristics of the battery. To improve. Further, as the reaction site with the electrolyte decreases, even if the decomposition reaction of the electrolyte occurs due to battery abnormality, the stability of the battery is not significantly impaired.
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| KR101123060B1 (en) * | 2007-07-23 | 2012-03-15 | 주식회사 엘지화학 | High Power Secondary Battery |
| US8673496B2 (en) | 2010-05-12 | 2014-03-18 | Samsung Sdi Co., Ltd. | Electrode composition, electrode for lithium secondary battery, method of manufacturing the electrode and lithium secondary battery including the electrode |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10312811A (en) * | 1997-03-11 | 1998-11-24 | Matsushita Electric Ind Co Ltd | Non-aqueous electrolyte secondary battery |
| KR19980083155A (en) * | 1997-05-12 | 1998-12-05 | 윤종용 | Lithium anode and lithium secondary battery employing the same |
| JPH1140153A (en) * | 1997-07-18 | 1999-02-12 | Hitachi Ltd | Battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10312811A (en) * | 1997-03-11 | 1998-11-24 | Matsushita Electric Ind Co Ltd | Non-aqueous electrolyte secondary battery |
| KR19980083155A (en) * | 1997-05-12 | 1998-12-05 | 윤종용 | Lithium anode and lithium secondary battery employing the same |
| JPH1140153A (en) * | 1997-07-18 | 1999-02-12 | Hitachi Ltd | Battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101123060B1 (en) * | 2007-07-23 | 2012-03-15 | 주식회사 엘지화학 | High Power Secondary Battery |
| US8673496B2 (en) | 2010-05-12 | 2014-03-18 | Samsung Sdi Co., Ltd. | Electrode composition, electrode for lithium secondary battery, method of manufacturing the electrode and lithium secondary battery including the electrode |
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