KR100637122B1 - Composition for surface-treating electrode current collector of lithium secondary battery - Google Patents
Composition for surface-treating electrode current collector of lithium secondary battery Download PDFInfo
- Publication number
- KR100637122B1 KR100637122B1 KR1020000018898A KR20000018898A KR100637122B1 KR 100637122 B1 KR100637122 B1 KR 100637122B1 KR 1020000018898 A KR1020000018898 A KR 1020000018898A KR 20000018898 A KR20000018898 A KR 20000018898A KR 100637122 B1 KR100637122 B1 KR 100637122B1
- Authority
- KR
- South Korea
- Prior art keywords
- current collector
- weight
- surface treatment
- polyvinylidene fluoride
- conductive agent
- Prior art date
Links
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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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
-
- 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
Abstract
본 발명은 폴리비닐리덴플루오라이드 50 내지 90 중량부와, 카본블랙 및 그래파이트중에서 선택된 도전제 10 내지 40 중량부와, 상기 폴리비닐리덴플루오라이드와 도전제를 용해 또는 분산시킬 수 있는 용매 500 내지 900 중량부를 포함하는 리튬 2차전지용 전극 집전체의 표면처리 조성물을 제공한다. 본 발명에 따르면, 폴리비닐리덴플루오라이드와 도전제를 집전체 표면에 코팅함으로써 집전체와 활물질층간의 계면저항이 감소하여 이온전도도와 고율 특성이 향상되고, 집전체와 활물질층간의 결착력이 증가한다. 또한, 집전체 표면처리시 결합제로서 애드코테를 사용한 경우에 발생되는 전지의 수명 열화를 미연에 방지할 수 있게 된다.The present invention is 50 to 90 parts by weight of polyvinylidene fluoride, 10 to 40 parts by weight of a conductive agent selected from carbon black and graphite, and 500 to 900 solvents capable of dissolving or dispersing the polyvinylidene fluoride and the conductive agent. It provides a surface treatment composition of an electrode current collector for a lithium secondary battery comprising a weight part. According to the present invention, by coating the polyvinylidene fluoride and the conductive agent on the surface of the current collector, the interface resistance between the current collector and the active material layer is reduced, thereby improving the ion conductivity and the high rate characteristic, and the binding force between the current collector and the active material layer is increased. . In addition, it is possible to prevent the deterioration of the life of the battery generated when the adcote is used as the binder during the current collector surface treatment.
Description
본 발명은 리튬 2차전지의 전극 집전체 표면처리 조성물에 관한 것으로서, 보다 상세하기로는 집전체 표면처리시 결합제로서 애드코테를 사용한 경우에 발생되는 수명 저하 문제점을 미연에 예방할 수 있을 뿐만 아니라 집전체와 활물질층간의 계면저항이 감소하여 이온전도도와 고율 특성이 우수하고 집전체와 활물질층간의 결착력이 우수한 리튬 2차전지의 전극 집전체 표면 처리 조성물에 관한 것이다.The present invention relates to an electrode current collector surface treatment composition of a lithium secondary battery, and more particularly, it is possible to prevent in advance the problem of deterioration in life caused by using adcote as a binder during current collector surface treatment. It relates to an electrode current collector surface treatment composition of a lithium secondary battery having excellent interfacial resistance between the active material layer and the active material layer, excellent in ion conductivity and high rate characteristics, and excellent in binding force between the current collector and the active material layer.
리튬 2차전지는 전해질의 종류에 따라서 액체 전해질을 사용하는 리튬 이온 전지와 고체형 전해질을 사용하는 리튬 이온 폴리머 전지로 나눌 수 있다. 이와 같이 리튬 이온 폴리머 전지는 고체형 전해질을 사용하므로 전해액이 누출될 염려가 적고, 가공성이 우수하여 배터리팩으로 만들 수 있다. 그리고 무게가 가볍고 부피가 적으며 자체 방전율도 아주 작다. 이와 같은 특성으로 말미암아 리튬 이온 폴리머 전지는 리튬 이온 전지에 비하여 안전할 뿐만 아니라 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. As described above, since the lithium ion polymer battery uses a solid electrolyte, there is little risk of leakage of the electrolyte, and excellent workability can be obtained as a battery pack. It is light in weight, low in volume, and has a very small self-discharge rate. Due to these characteristics, lithium ion polymer batteries are not only safer than lithium ion batteries, but also easy to manufacture in square and large sized batteries.
한편, 리튬 2차전지는 통상적으로 캐소드, 세퍼레이타 및 애노드를 포함하여 이루어진다. 이 때 상기 캐소드와 애노드는 각각의 집전체 상부에 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 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.
상기 방법에 따르면, 집전체에 대한 활물질층의 결합력이 약하고, 집전체와 활물질층간의 계면저항이 상승되어 여러 가지 문제점을 발생시킨다. 이러한 문제점을 해결하기 위하여 집전체의 양 면에 통상적인 결합제와 도전제를 포함하는 조성물을 코팅한 다음, 건조 및 열처리하여 표면처리막을 형성하는 방법이 제안되었다. According to the above method, the binding force of the active material layer to the current collector is weak, and the interface resistance between the current collector and the active material layer is increased, which causes various problems. In order to solve this problem, a method of forming a surface treatment film by coating a composition including a conventional binder and a conductive agent on both sides of the current collector, followed by drying and heat treatment.
상기 도전제로는 도전성 네트워크를 형성할 수 있는 탄소 재료를 사용하며, 결합제로서 애드코테(adcote)(Molton사)를 사용하는 것이 통상적이다. 여기에서 애드코테는 상품명으로 폴리(에틸렌-코-아크릴산) 에멀젼 상태이며, 상기 에멀젼내의 용매로서 주용매인 물과 부용매인 이소프로필 알콜을 함유하고 있다.As the conductive agent, a carbon material capable of forming a conductive network is used, and it is common to use adcote (Molton) as a binder. Here, adcote is a poly (ethylene-co-acrylic acid) emulsion state by brand name, and contains water as a main solvent and isopropyl alcohol as a subsolvent as a solvent in the said emulsion.
그런데, 이와 같이 결합제로서 애드코테를 사용하는 경우, 이 화합물이 수분에 대한 흡착력을 갖고 있고, 에멀젼내 이미 물을 함유하고 있어서 최종적으로 만들어진 전지내에 수분이 미량 잔류하게 되는 결과를 초래할 뿐만 아니라, 가소제 추출용매인 메탄올에 의하여 일부 용해됨에 따라 전지 수명이 열화되는 문제점이 있다. However, in the case of using adcote as a binder as described above, this compound has adsorptive power to moisture and already contains water in the emulsion, resulting in a small amount of water remaining in the finally produced battery, as well as a plasticizer. There is a problem in that the battery life is deteriorated as it is partially dissolved by methanol as an extraction solvent.
본 발명이 이루고자 하는 기술적 과제는 상기 문제점을 해결하여 전지의 성능에 치명적인 영향을 미치는 수분량을 줄일 수 있고, 추출용매인 메탄올과의 반응성이 없어서 이로 인한 전지의 수명 열화를 미연에 방지할 수 있는 리튬 2차전지용 전극 집전체 표면처리 조성물을 제공하는 것이다.The technical problem to be achieved by the present invention is to solve the above problems to reduce the amount of moisture that has a fatal effect on the performance of the battery, there is no reactivity with methanol as the extraction solvent, which can prevent the deterioration of the life of the battery due to this in advance It is providing the electrode current collector surface treatment composition for secondary batteries.
상기 기술적 과제를 이루기 위하여 본 발명에서는, 폴리비닐리덴플루오라이드 50 내지 90 중량부와, 카본블랙 및 그래파이트중에서 선택된 도전제 10 내지 40 중량부를 포함하는 리튬 2차전지용 전극 집전체의 표면처리 조성물을 제공한다.In order to achieve the above technical problem, the present invention provides a surface treatment composition of an electrode current collector for a lithium secondary battery comprising 50 to 90 parts by weight of polyvinylidene fluoride and 10 to 40 parts by weight of a conductive agent selected from carbon black and graphite. do.
본 발명의 특징은 전극 집전체 표면 처리시 결합제로서 폴리비닐리덴플루오라이드를 사용한 데 그 특징이 있다. 이 때 상기 폴리비닐리덴플루오라이드는 소수성을 띠므로 수분에 의한 전지의 성능 열화 문제점이 예방되고, 가소제 추출용매인 메탄올에 대하여 용해되지 않으므로 애드코테를 사용한 경우의 전지 수명 열화 문제점이 전혀 발생되지 않는다. 중량평균분자량이 100,000 내지 300,000으로서, 이를 도전제와 함께 혼합하여 집전체에 표면처리하면, 집전체와 활물질층간의 결착력을 향상시키는 동시에 전기전도도를 개선하여 계면저항을 줄임으로써 전지의 수명을 개선시킬 수 있게 된다.A feature of the present invention is that polyvinylidene fluoride is used as a binder in the surface treatment of the electrode current collector. At this time, since the polyvinylidene fluoride is hydrophobic, the problem of performance deterioration of the battery due to moisture is prevented, and since the polyvinylidene fluoride is not dissolved in methanol, which is a plasticizer extraction solvent, the problem of battery life deterioration does not occur at all. . If the weight average molecular weight is 100,000 to 300,000, and mixed with a conductive agent to surface-treat the current collector, improve the binding strength between the current collector and the active material layer, and improve the electrical conductivity to reduce the interface resistance to improve the life of the battery It becomes possible.
본 발명의 전극 집전체 표면처리 조성물은 상술한 바와 같이, 결합제인 폴리비닐플루오라이드와 도전제를 이들을 용해 또는 분산시킬 수 있는 용매를 함유한다. 이 때 상기 도전제로는 카본블랙, 그래파이트 등을 사용하며, 용매는 N-메틸피롤리돈, 아세톤 등을 사용한다. As described above, the electrode current collector surface treatment composition of the present invention contains a solvent capable of dissolving or dispersing a polyvinyl fluoride as a binder and a conductive agent. In this case, carbon black, graphite, and the like are used as the conductive agent, and N-methylpyrrolidone, acetone, and the like are used as the solvent.
상기 폴리비닐리덴플루오라이드는 바람직하게는 중량평균분자량이 100,000 내지 3000,000이며, 그의 함량은 50 내지 90 중량부이며, 도전제의 함량은 10 내지 50 중량부를 사용한다. 여기에서 폴리비닐리덴플루오라이드의 중량평균분자량이 100,000 미만인 경우에는 결합제의 함량이 상대적으로 많아져 도전성이 감소하고, 3000,000을 초과하는 경우에는 집전체와 활물질층간의 결착성이 저하되어 바람직하지 못하다. 그리고 폴리비닐리덴플루오라이드의 함량이 50 중량부 미만인 경우에는 집전체와 활물질층간의 결착성이 저하되고 90 중량부를 초과하는 경우에는 전도성이 감소되므로 바람직하지 못하다. 그리고 용매는 도전제와 결합제를 합한 고형분의 함량이 조성물 총중량을 기준으로 하여 1 내지 10중량%가 되도록 그 함량을 조절한다.Preferably, the polyvinylidene fluoride has a weight average molecular weight of 100,000 to 3000,000, its content is 50 to 90 parts by weight, and the content of the conductive agent is 10 to 50 parts by weight. If the weight average molecular weight of the polyvinylidene fluoride is less than 100,000, the content of the binder is relatively high, the conductivity decreases, and if it exceeds 3000,000, the binding property between the current collector and the active material layer is deteriorated. Can not do it. When the content of the polyvinylidene fluoride is less than 50 parts by weight, the binding property between the current collector and the active material layer is lowered, and when it exceeds 90 parts by weight, the conductivity is not preferable. And the solvent is adjusted so that the content of the solid content of the conductive agent and the binder is 1 to 10% by weight based on the total weight of the composition.
본 발명의 전극 집전체 표면처리 조성물은 경우에 따라서는 계면활성제를 더 함유하기도 한다. 이 때 계면활성제의 종류 및 함량은 표면처리 조성물에서 사용되는 통상적인 수준이다. 이러한 계면활성제외에 이미드(imide)계, 아미드(amide)계 화합물, 산(acid) 등을 더 사용하는 것도 가능하다In some cases, the electrode current collector surface treatment composition of the present invention may further contain a surfactant. At this time, the type and content of the surfactant is the usual level used in the surface treatment composition. In addition to these surfactants, it is also possible to further use imide-based, amide-based compounds, acids, and the like.
이하, 본 발명에 따른 표면처리 조성물을 이용하여 전극 집전체에 표면처리하는 방법을 살펴보기로 한다.Hereinafter, a method of surface treatment on an electrode current collector using the surface treatment composition according to the present invention will be described.
먼저, 집전체를 산 또는 알칼리 수용액으로 세정한다. 이 때 집전체가 캐소드 집전체인 알루미늄 박막인 경우는 알칼리 수용액, 예를 들어 5% NaOH 수용액 또는 KOH 수용액을 사용하여 세정하며, 집전체가 애노드 집전체엔 구리 박막인 경우는 산 수용액, 예를 들어 2M HCl 수용액을 사용하여 세정한다. 여기에서 집전체로는 박막, 익스팬디드 메탈(expanded metal), 펀치드 메탈(punched metal) 등을 사용한다.First, the current collector is washed with an acid or alkaline aqueous solution. In this case, when the current collector is an aluminum thin film which is a cathode current collector, it is washed with an aqueous alkali solution, for example, a 5% NaOH aqueous solution or a KOH aqueous solution, and when the current collector is a copper thin film as an anode current collector, an acid aqueous solution, for example For example, using 2M aqueous HCl solution. Herein, a thin film, an expanded metal, a punched metal, or the like is used as the current collector.
이어서, 산 또는 알칼리 수용액으로 세정된 집전체를 증류수로 세척한 다음, 아세톤 등과 같은 유기용매를 이용하여 더 세척한다. 이와 같이 세정된 집전체를 건조한다. 이 때 건조방법은 특별히 한정되지는 않으나, 공기를 이용하여 건조하는 것이 통상적이다.Subsequently, the current collector washed with an acid or alkaline aqueous solution is washed with distilled water, and then further washed with an organic solvent such as acetone. The current collector thus washed is dried. At this time, the drying method is not particularly limited, but drying with air is common.
이와 별도로, 폴리비닐리덴플루오라이드 50 내지 90 중량부, 카본블랙 및 그래파이트중에서 선택된 하나 이상의 도전제 10 내지 40 중량부 및 적정량의 용매를 혼합하여 표면 처리 조성물을 준비한다. 여기에서 용매는 도전제와 결합제를 합한 고형분의 함량이 조성물 총중량을 기준으로 하여 1 내지 10중량%가 되도록 그 함량을 조절한다.Separately, a surface treatment composition is prepared by mixing 50 to 90 parts by weight of polyvinylidene fluoride, 10 to 40 parts by weight of at least one conductive agent selected from carbon black and graphite, and an appropriate amount of a solvent. Here, the solvent is adjusted so that the content of the solid content of the conductive agent and the binder is 1 to 10% by weight based on the total weight of the composition.
그리고 나서, 얻어진 표면 처리 조성물을 상기 건조된 캐소드 집전체와 애노드 집전체의 양 면에 각각 코팅한 다음, 이를 열처리함으로써 양 면에 표면 처리막이 형성된 집전체가 완성된다. 여기에서 표면 처리 조성물의 코팅방법은 특별히 한정되지는 않으나, 스프레이 코팅법을 사용한다. Then, the obtained surface treatment composition is coated on both sides of the dried cathode current collector and the anode current collector, respectively, and then heat treated to complete the current collector having the surface treatment film formed on both surfaces. Here, the coating method of the surface treatment composition is not particularly limited, but a spray coating method is used.
상기 열처리과정은 열풍기 또는 램프를 이용하여 100 내지 200℃ 범위를 유지하도록 한다. 이 때 열처리온도가 200℃를 초과하는 경우에는 집전체로서 구리 박막을 사용하는 경우에는 구리 박막이 연성이 생기므로 바람직하지 못하다.The heat treatment process is to maintain a range of 100 to 200 ℃ using a hot air fan or lamp. At this time, when the heat treatment temperature exceeds 200 ° C., when the copper thin film is used as the current collector, the copper thin film is ductile, which is not preferable.
상술한 과정에 따라 얻어진 캐소드 집전체와 애노드 집전체 상에 각각의 활물질 조성물을 직접적으로 코팅하거나 캐스팅하여 캐소드와 애노드를 제조한다. 이렇게 얻어진 캐소드와 애노드에 세퍼레이타를 개재한 다음, 실리콘 고무 재질 또는 스테인레스 핫 롤로 라미네이팅한다. 이어서, 상기 결과물을 활성화공정, 탭용접공정 및 패키징공정을 거침으로써 리튬 2차전지를 완성한다.A cathode and an anode are manufactured by directly coating or casting each active material composition on the cathode current collector and the anode current collector obtained according to the above-described process. 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. Subsequently, the resultant is subjected to an activation process, a tap welding process, and a packaging process to complete a lithium secondary 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
캐소드 집전체인 두께가 20㎛인 알루미늄 호일 표면을 다음과 같이 정제하였다. 알루미늄 호일을 먼저 5% 수산화나트륨 수용액에 15초동안 담근 다음, 이를 증류수로 세척하였다. 이후, 아세톤으로 세척한 다음, 에어 드라이하였다.An aluminum foil surface having a thickness of 20 μm, which is a cathode current collector, was purified as follows. The aluminum foil was first immersed in 5% aqueous sodium hydroxide solution for 15 seconds and then washed with distilled water. It was then washed with acetone and then air dried.
이와 별도로, 폴리비닐플루오라이드 5g에 NMP 90g에 용해한 다음, 여기에 슈퍼피 5g을 부가하여 표면처리 조성물을 준비하였다. 이 표면 처리 조성물을 상기 과정을 거친 알루미늄 메시 상부에 10㎛의 두께로 스프레이 코팅한 다음, 열풍기를 이용하여 약 170℃에서 건조함으로써 캐소드 집전체의 표면처리를 실시하였다.Separately, 5 g of polyvinyl fluoride was dissolved in 90 g of NMP, and then 5 g of SuperP was added thereto to prepare a surface treatment composition. The surface treatment composition was spray-coated to a thickness of 10 μm on the aluminum mesh subjected to the above process, and then dried at about 170 ° C. using a hot air blower to perform surface treatment of the cathode current collector.
한편, 애노드 집전체인 구리 박막을 2M HCl 수용액에 5초동안 담금 다음, 증류수로 세척하였다. 이어서, 이를 아세톤으로 세척한 다음, 에어드라이하였다. On the other hand, the anode current collector copper thin film was immersed in 2M HCl aqueous solution for 5 seconds, and then washed with distilled water. It was then washed with acetone and then air dried.
그 후, 캐소드의 경우와 마찬가지로 구리 박막상에 상기 표면 처리 조성물을 10㎛의 두께로 스프레이 코팅한 다음, 열풍기를 이용하여 약 170℃에서 건조함으로써 애노드 집전체의 표면처리를 실시하였다.Thereafter, the surface treatment composition was spray-coated on the copper thin film in a thickness of 10 μm, and then dried at about 170 ° C. using a hot air blower to perform surface treatment of the anode current collector.
표면처리된 알루미늄 박막과 구리 박막 상부에, 캐소드 활물질 조성물과 애노드 활물질 조성물을 각각 캐스팅한 다음, 건조하여 캐소드와 애노드를 제조하였다. 여기에서 캐소드 활물질 조성물은 LiMn2O4 1000g과 카본블랙 50g을 혼합한 다음, 여기에 폴리비닐리덴플루오라이드 123g, NMP 500g, 아세톤 700g 및 디부틸프탈산 230g의 혼합물을 부가하여 충분히 혼합하여 제조하였다. 그리고 애노드 활물질 조성물은 그래파이트 1000g과 폴리비닐리덴플루오라이드 120g, NMP 500g, 아세톤 700g을 충분히 혼합하여 제조하였다.The cathode active material composition and the anode active material composition were cast on the surface-treated aluminum thin film and the copper thin film, respectively, and dried to prepare a cathode and an anode. Here, the cathode active material composition was prepared by mixing 1000 g of LiMn 2 O 4 and 50 g of carbon black, and then adding a mixture of 123 g of polyvinylidene fluoride, 500 g of NMP, 700 g of acetone, and 230 g of dibutylphthalic acid to sufficiently mix them. The anode active material composition was prepared by sufficiently mixing graphite 1000g, polyvinylidene fluoride 120g, NMP 500g, and acetone 700g.
그 후, 얻어진 캐소드, 애노드 및 고분자 전해질을 스테인레스 핫 롤(stainless hot roll)을 이용하여 라미네이팅하였다. 이어서, 메탄올을 이용하여 상기 결과물로부터 디부틸 프탈레이트를 추출해내고, 이를 유기 전해액을 함침시키고 활성화공정, 탭용접공정 및 패키징 공정을 거침으로써 리튬 2차 전지를 완성하였다.Thereafter, the obtained cathode, anode and polymer electrolyte were laminated using a stainless hot roll. Subsequently, dibutyl phthalate was extracted from the resultant using methanol, and the lithium secondary battery was completed by impregnating the organic electrolyte solution and going through an activation process, a tap welding process, and a packaging process.
비교예Comparative example
표면처리 조성물 제조시 폴리비닐리덴플루오라이드 대신 애드코데(Molton사)(성분명: 폴리(에틸렌-코-아크릴산))을 사용한 것을 제외하고는, 실시예와 동일한 방법에 따라 실시하여 리튬 2차전지를 완성하였다.A lithium secondary battery was completed in the same manner as in Example, except that Adcode (component name: Poly (ethylene-co-acrylic acid)) was used instead of polyvinylidene fluoride in preparing the surface treatment composition. It was.
상기 실시예 및 비교예에 따라 제조된 리튬 2차 전지의 이온전도도, 고율 특성 및 수명 특성을 측정하였다.Ion conductivity, high rate characteristics, and lifetime characteristics of the lithium secondary batteries prepared according to the above Examples and Comparative Examples were measured.
측정 결과, 실시예에 따라 제조된 리튬 2차 전지는 비교예의 경우에 비교하여 활물질층과 집전체간의 접착력 및 이온전도도 특성은 거의 동일한 수준으로 우수하였다. 그러나, 수명 특성면에서는 실시예의 리튬 2차전지가 비교예의 경우에 비하여 향상된다는 것을 확인할 수 있었다. 이는 집전체 표면처리시 비교예의 애드코테 대신 실시예에서는 폴리비닐리덴플루오라이드를 사용함으로써 애드코테가 메탄올에 의하여 용해되는 현상이나 수분에 의한 악영향을 미연에 방지할 수 있게 되어 이로 인한 수명 열화가 억제되었기 때문이다.As a result of the measurement, the lithium secondary battery prepared according to the Example was superior in the adhesive strength and ion conductivity characteristics between the active material layer and the current collector to about the same level as in the comparative example. However, in terms of life characteristics, it was confirmed that the lithium secondary battery of the example was improved as compared with the case of the comparative example. This is because the polyvinylidene fluoride in the embodiment instead of adcote in the surface treatment of the current collector, it is possible to prevent the dissolution of adcote by methanol and adverse effects due to moisture, thereby preventing the deterioration of the life. Because
본 발명에 따르면, 폴리비닐리덴플루오라이드와 도전제를 집전체 표면에 코팅함으로써 집전체와 활물질층간의 계면저항이 감소하여 이온전도도와 고율 특성이 향상되고, 집전체와 활물질층간의 결착력이 증가한다. 또한, 집전체 표면처리시 결합제로서 애드코테를 사용한 경우에 발생되는 전지의 수명 열화를 미연에 방지할 수 있게 된다.According to the present invention, by coating the polyvinylidene fluoride and the conductive agent on the surface of the current collector, the interface resistance between the current collector and the active material layer is reduced, thereby improving the ion conductivity and the high rate characteristic, and the binding force between the current collector and the active material layer is increased. . In addition, it is possible to prevent the deterioration of the life of the battery generated when the adcote is used as the binder during the current collector surface treatment.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000018898A KR100637122B1 (en) | 2000-04-11 | 2000-04-11 | Composition for surface-treating electrode current collector of lithium secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000018898A KR100637122B1 (en) | 2000-04-11 | 2000-04-11 | Composition for surface-treating electrode current collector of lithium secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20010095626A KR20010095626A (en) | 2001-11-07 |
| KR100637122B1 true KR100637122B1 (en) | 2006-10-20 |
Family
ID=19663405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020000018898A KR100637122B1 (en) | 2000-04-11 | 2000-04-11 | Composition for surface-treating electrode current collector of lithium secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR100637122B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102209822B1 (en) | 2014-01-28 | 2021-01-29 | 삼성에스디아이 주식회사 | Cathode, lithium battery containing cathode, and preparation method thereof |
| WO2023080515A1 (en) * | 2021-11-03 | 2023-05-11 | 주식회사 엘지화학 | Positive electrode current collector having coated adhesion-promoting layer, positive electrode for lithium secondary battery comprising same, and lithium secondary battery |
| KR20230064478A (en) * | 2021-11-03 | 2023-05-10 | 주식회사 엘지화학 | Positive electrode current collector coated with adhesion enhancement layer and manufacturing method thereof, positive electrode for lithium secondary battery and lithium secondary battery comprising same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06163030A (en) * | 1992-11-16 | 1994-06-10 | Sony Corp | Nonaqueous electrolyte secondary battery |
| JPH0997625A (en) * | 1995-09-29 | 1997-04-08 | Seiko Instr Inc | Nonaqueous electrolytic secondary battery and manufacture thereof |
| JPH1149916A (en) * | 1997-08-04 | 1999-02-23 | Kuraray Co Ltd | Rapid-curing two-package adhesive composition |
| JPH11149916A (en) * | 1997-11-18 | 1999-06-02 | Matsushita Electric Ind Co Ltd | Organic electrolytic battery |
| KR20000055680A (en) * | 1999-02-09 | 2000-09-15 | 성재갑 | Lithium ion polymer battery having superior temperatrure property and process for preparing the same |
-
2000
- 2000-04-11 KR KR1020000018898A patent/KR100637122B1/en active IP Right Grant
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06163030A (en) * | 1992-11-16 | 1994-06-10 | Sony Corp | Nonaqueous electrolyte secondary battery |
| JPH0997625A (en) * | 1995-09-29 | 1997-04-08 | Seiko Instr Inc | Nonaqueous electrolytic secondary battery and manufacture thereof |
| JPH1149916A (en) * | 1997-08-04 | 1999-02-23 | Kuraray Co Ltd | Rapid-curing two-package adhesive composition |
| JPH11149916A (en) * | 1997-11-18 | 1999-06-02 | Matsushita Electric Ind Co Ltd | Organic electrolytic battery |
| KR20000055680A (en) * | 1999-02-09 | 2000-09-15 | 성재갑 | Lithium ion polymer battery having superior temperatrure property and process for preparing the same |
Non-Patent Citations (3)
| Title |
|---|
| 1020000055680 |
| 11049916 |
| 11149916 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010095626A (en) | 2001-11-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100280705B1 (en) | Electrode active material composition for lithium ion polymer battery and manufacturing method of electrode plate for lithium ion polymer battery using same | |
| KR101761803B1 (en) | Aqueous slurry for battery electrodes | |
| US11069940B2 (en) | Ionically conductive material for electrochemical generator and production methods | |
| CN108493389A (en) | A kind of phenolic resin modified ceramic diaphragm and its application | |
| KR20140106292A (en) | Anode for lithium secondary battery and lithium secondary battery using the same | |
| EP3042410B1 (en) | Additives for improving the ionic conductivity of lithium-ion battery electrodes | |
| JP2009544135A (en) | Battery, battery electrode, and manufacturing method thereof | |
| KR20130012492A (en) | Lithium secondary cell comprising polar solvent and bi-polar plate coated with poly-dopamine | |
| KR100362281B1 (en) | Lithium ion polymer battery using cathod current collector coated electron-conductive polymer | |
| KR100637122B1 (en) | Composition for surface-treating electrode current collector of lithium secondary battery | |
| US20050129838A1 (en) | Process for the manufacture of electrodes and high energy lithium polymer batteries | |
| CN113690445B (en) | Positive electrode slurry, preparation method thereof, positive electrode plate and lithium ion battery | |
| KR100637117B1 (en) | Surface-treating composition of current collector for lithium secondary battery and surface-treating method using the same | |
| CN114864942A (en) | Negative electrode for lithium ion battery, preparation method thereof and lithium ion battery comprising same | |
| KR100357960B1 (en) | Lithium secondary battery | |
| KR100591615B1 (en) | Lithium secondary battery | |
| KR100615161B1 (en) | Composition for surface-treating electrode current collector of lithium secondary battery | |
| KR100573098B1 (en) | Surface-treating composition of electrode current collector for lithium secondary battery and surface-treating method using the same | |
| KR100563033B1 (en) | Surface treating composition for current collector of lithium secondary battery and surface treating method using the same | |
| CN105336928B (en) | Preparation method and application of polypyrrole-coated carbon fluoride cathode material | |
| WO2023162942A1 (en) | Electrode forming composition | |
| JPH05283106A (en) | Battery positive electrode sheet, its manufacture, fully-solid secondary battery | |
| KR100329569B1 (en) | Lithium secondary battery | |
| KR100366359B1 (en) | Lithium ion negative electrode coated with coating solution containing organic acid | |
| KR100553736B1 (en) | Composition of active material for lithium secondary batteries |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant | ||
| FPAY | Annual fee payment |
Payment date: 20120921 Year of fee payment: 7 |
|
| FPAY | Annual fee payment |
Payment date: 20130924 Year of fee payment: 8 |
|
| FPAY | Annual fee payment |
Payment date: 20140930 Year of fee payment: 9 |
|
| FPAY | Annual fee payment |
Payment date: 20150925 Year of fee payment: 10 |
|
| FPAY | Annual fee payment |
Payment date: 20160922 Year of fee payment: 11 |
|
| FPAY | Annual fee payment |
Payment date: 20170920 Year of fee payment: 12 |
|
| FPAY | Annual fee payment |
Payment date: 20180917 Year of fee payment: 13 |
|
| FPAY | Annual fee payment |
Payment date: 20191001 Year of fee payment: 14 |