KR20000021384A - Electrode binder of secondary battery and method for manufacturing slurry of active material using the electrode binder - Google Patents

Electrode binder of secondary battery and method for manufacturing slurry of active material using the electrode binder Download PDF

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KR20000021384A
KR20000021384A KR1019980040413A KR19980040413A KR20000021384A KR 20000021384 A KR20000021384 A KR 20000021384A KR 1019980040413 A KR1019980040413 A KR 1019980040413A KR 19980040413 A KR19980040413 A KR 19980040413A KR 20000021384 A KR20000021384 A KR 20000021384A
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South Korea
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active material
mixed
polyvinylidene fluoride
binder
secondary battery
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KR1019980040413A
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Korean (ko)
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KR100496276B1 (en
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김진경
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손욱
삼성에스디아이 주식회사
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • 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
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • H01M4/133—Electrodes based on 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
    • 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
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • H01M4/623—Binders being polymers fluorinated polymers
    • 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
    • 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)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

PURPOSE: An electrode binder of a secondary battery and a method for manufacturing a slurry of an active material using the electrode binder are provided to improve a machines life, and to prevent defection of the electric active material by using a binder mixed with a PVDF(Polyvinylidene fluoride) and an SBR(Styrene butadiene rubber). CONSTITUTION: An electrode binder of a secondary battery adds a weak acid in a regular weight rate for a polyvinylidene fluoride, and mixes a styrene butadiene rubber with the polyvinylidene fluoride. 0.1-0.6weight percent for the styrene butadiene rubber and for the polyvinylidene fluoride is added to the weak acid. 60-95 weight percent for the styrene butadiene rubber is mixed with the polyvinylidene fluoride. A method for manufacturing a slurry of a cathode active material of the secondary battery comprises the steps of: adding a small amount of the weak acid to the electrode binder, mixed with the polyvinylidene fluoride and the styrene butadiene rubber; mutually equalizing adhesion of two binders; and mixing/stirring the binder, mixed with the polyvinylidene fluoride and the styrene butadiene rubber, with an organic solvent which is N-methyl pyrrolidone and the active material which is a carbon. The mixed binder is mixed in 1-5 weight percent for the active material.

Description

이차전지의 전극 바인더와 이를 이용한 활물질 슬러리의 제조방법Electrode Binder of Secondary Battery and Manufacturing Method of Active Material Slurry Using the Same

본 발명은 접착력과 그 균일성이 향상된 혼합 바인더(binder)를 사용하여 활물질과 기재의 접착력을 높이므로 전지의 수명과 고율 충, 방전특성을 향상시킬 수 있도록 한 이차전지의 전극 바인더와 이를 이용한 활물질 슬러리의 제조방법에 관한 것이다.The present invention increases the adhesion between the active material and the base material by using a mixed binder (adhesive) with improved adhesion and uniformity, so that the electrode binder of the secondary battery and the active material using the same to improve the battery life, high rate charge, discharge characteristics It relates to a method for producing a slurry.

이차전지는 재충전이 가능하고 소형 및 대용량화가 용이한 것으로, 대표적으로는 니켈수소(Ni-MH)전지, 리튬(Li)전지 및 리튬이온(Li-ion)전지가 사용되고 있다.Secondary batteries are rechargeable, easy to miniaturize, and large in capacity, and typically include nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) batteries.

여기서 리튬이온전지는 정극 활물질로 리튬-천이금속산화물이 사용되고, 부극활물질로 카본 혹은 카본복합체가 사용되며, 산소기, 질소기, 황산기 등을 포함하는 한 개 이상의 유기 용매에 리튬염을 녹인 액체 전해질이 사용되어서, 정극과 부극간에 리튬 이온이 이동될 때 기전력을 발생시킴으로써 충·방전이 이루어지도록 한다.The lithium ion battery is a lithium-transition metal oxide as a positive electrode active material, carbon or a carbon complex is used as a negative electrode active material, and a liquid electrolyte in which lithium salt is dissolved in one or more organic solvents including an oxygen group, a nitrogen group, and a sulfate group. It is used to generate an electromotive force when lithium ions are moved between the positive electrode and the negative electrode so that charging and discharging are performed.

이러한 리튬이온전지에서 정극 및 부극과 같은 전극(電極)은 전지의 종류에 따라 다소 차이가 있지만, 리튬-천이금속산화물 및 카본으로 된 활물질과, 폴리비닐리덴 플로라이드(PVDF; polyvinylidene fluoride)로 된 바인더 및 N-메틸 피롤리돈(NMP; N-methyl-2-pyrrolidone)으로 된 유기 용매, 카본으로 된 도전제(정극의 경우)를 혼합하여 슬러리를 제조한 다음, 이것을 알루미늄(Al) 및 코퍼(Cu) 호일로 된 기재에 코팅하고, 다시 건조 및 롤 프레스한 다음 소정의 크기로 절단하는 공정에 의해 제조하고 있다.In such a lithium ion battery, electrodes such as a positive electrode and a negative electrode are somewhat different depending on the type of battery, but are made of an active material made of lithium-transition metal oxide and carbon, and polyvinylidene fluoride (PVDF). A slurry was prepared by mixing a binder, an organic solvent of N-methyl-2-pyrrolidone (NMP) and a conductive agent of carbon (for positive electrode), and then preparing aluminum (Al) and copper. (Cu) It manufactures by the process of coating on the base material of foil, drying and roll pressing again, and cutting | disconnecting to predetermined size.

그러나 상기한 전극 제조에 사용하는 바인더는 고율 충, 방전특성이 우수한 반면, 접착력이 약하여 활물질의 탈락이 발생하므로 결국 전지의 수명을 저하시키고 있다.However, the binder used in the above electrode production has excellent high-rate charging and discharging characteristics, but the adhesive force is weak, resulting in dropping of the active material, which in turn reduces the life of the battery.

이러한 문제점을 고려한 것으로서 미국 특허 US 5,380,606호에는 전극의 바인더로서, 폴리아믹 애시드(polyamic acid)와, 폴리아마이드 레진(polyamide resin), 폴리비닐 피롤리돈(polyvinylpyrrolidone) 그리고 하이드록시알킬셀룰로오즈(hydroxyalkylcellulose)로 된 그룹으로부터 선택된 적어도 하나의 폴리머를 포함하는 혼합 바인더를 제안하여, 전지의 수명과 신뢰성을 향상시키고 있다.In consideration of this problem, US Pat. No. 5,380,606 discloses a binder of an electrode as polyamic acid, polyamide resin, polyvinylpyrrolidone and hydroxyalkylcellulose. It is proposed a mixed binder containing at least one polymer selected from the group selected to improve the life and reliability of the battery.

그러나 상기한 혼합 바인더는 극판의 건조 공정시 추가된 폴리아믹 애시드를 제거하기 위해 200∼400℃에서 고온 열처리를 해야하기 때문에, 공정의 운영이 복잡하고 어려우며, 열처리시 전극의 물성이 변화하는 문제점이 있다.However, the above-mentioned mixed binder has to be subjected to a high temperature heat treatment at 200 to 400 ° C. in order to remove the polyamic acid added during the drying process of the electrode plate, so that the operation of the process is complicated and difficult, and the physical properties of the electrode are changed during the heat treatment. have.

반면 이차전지의 전극 제조에 사용하는 것으로 접착력이 강한 바인더로는 스틸렌 부타디엔 러버(SBR)가 있다. 이것은 접착력이 강하지만 전극을 구성할 경우 압연율이 낮아 스프링백현상이 발생하게 되며, 그로 인하여 전극 충, 방전시의 부피 팽창에 의해 활물질의 탈락이 발생하므로 전지의 수명을 단축하게 된다.On the other hand, styrene butadiene rubber (SBR) is used as a binder having strong adhesive strength, which is used for manufacturing an electrode of a secondary battery. The adhesive force is strong, but when the electrode is composed of a low rolling rate springback phenomenon occurs, thereby reducing the life of the battery due to the drop off of the active material by the volume expansion during electrode charging, discharging.

이에 따라 종래에는 전지의 부극에 사용하는 바인더로 PVDF와 SBR의 2종을 함께 혼합한 것이 개시되어 있지만, 이것은 2종의 바인더가 상호 접착력의 차이가 커 전극의 전체적인 균질성을 저하시키기 때문에 충, 방전시 활물질이 탈락되거나 고형분을 들뜨게 하는 문제점을 안고 있다.As a result, a mixture of two types of PVDF and SBR as a binder used in the negative electrode of a battery is disclosed in the related art. However, since the two kinds of binders have a large difference in mutual adhesion, they reduce the overall homogeneity of the electrode. When the active material is dropped or has a problem to lift the solids.

상술한 종래 기술의 문제점을 해결하기 위한 것으로서, 본 발명은 PVDF와 SBR로 된 혼합 바인더의 접착력을 상호 같게 하여, 전극 활물질의 탈락을 방지하고 수명을 향상시킬 수 있도록 한 이차전지의 전극 바인더와 이를 이용한 활물질 슬러리의 제조방법을 제공함에 그 목적을 두고 있다.In order to solve the above-mentioned problems of the prior art, the present invention is to equalize the adhesive strength of the mixed binder of PVDF and SBR, the electrode binder of the secondary battery to prevent the falling off of the electrode active material and improve the life and the same The object of the present invention is to provide a method for preparing the used active material slurry.

또 본 발명은 기재에 묻어 있는 유분을 제거하여 활물질과의 직접 접촉 및 그 접착력을 향상시키는 방안으로, 전지의 수명과 고율 충, 방전 특성을 향상시킬 수 있도록 함에 다른 목적을 두고 있다.In another aspect, the present invention is to improve the life and high rate charge, discharge characteristics of the battery as a way to improve the direct contact with the active material and its adhesion by removing the oil on the substrate.

이를 위하여 본 발명은 정극 및 부극을 포함하는 전극을 제조함에 있어 전극의 활물질 제조시 사용하는 바인더로, PVDF와 SBR을 포함하는 혼합 바인더를 사용하되, 여기에 PVDF에 대한 일정 무게비로 약산을 미량 첨가하여 PVDF와 SBR이 같은 접착력을 갖도록 한 것이다.To this end, the present invention uses a mixed binder containing PVDF and SBR as a binder used in the preparation of the active material of the electrode in the production of an electrode including a positive electrode and a negative electrode, to which a weak acid is added in a predetermined weight ratio to PVDF Thus, PVDF and SBR have the same adhesive force.

이와 같이 얻어진 혼합 바인더는 카본으로 된 활물질과 NMP로 된 유기 용매와 함께 혼합 및 교반함으로써 이차전지의 부극 활물질 슬러리로 제조되어 진다. 또 정극 활물질 슬러리의 경우에는 상기 혼합 바인더와, NMP로 된 유기 용매, 카본으로 된 도전제 및 리튬-천이금속산화물로 된 활물질을 함께 혼합하여 교반함으로써 얻어질 수 있다.The mixed binder thus obtained is prepared into a negative electrode active material slurry of a secondary battery by mixing and stirring together with an active material made of carbon and an organic solvent made of NMP. In the case of the positive electrode active material slurry, the mixed binder and the organic solvent made of NMP, the conductive material made of carbon, and the active material made of lithium-transition metal oxide can be obtained by mixing and stirring together.

여기서 약산은 PVDF와의 화학적인 결합에 의해 그 접착력을 강화하여 SBR과 같은 정도의 접착력을 갖도록 하므로 전극 전체의 접착력의 균질성과 그에 따른 수명을 향상시키도록 작용하고, 기재의 제조시 압연 공정에서 그 표면에 잔류하는 유분을 제거하므로 활물질과 기재의 직접 접촉 및 그 접착력을 향상시켜 전지의 수명과 고율 충, 방전특성을 향상시키도록 작용하게 된다.In this case, the weak acid enhances the adhesive strength by chemical bonding with PVDF to have the same adhesive strength as SBR, so that the weak acid acts to improve the homogeneity of the adhesive force of the entire electrode and its lifespan. Since the oil residues are removed, the direct contact between the active material and the substrate and the adhesion thereof are improved, thereby improving the lifespan, high rate charging and discharging characteristics of the battery.

이하, 본 발명의 바람직한 실시예를 첨부 도면에 의거하여 보다 상세하게 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described in detail based on an accompanying drawing.

본 발명에서는 이차전지의 일 예로서 리튬이온전지에 사용되는 전극에 대하여 설명하기로 한다.In the present invention, an electrode used in a lithium ion battery as an example of a secondary battery will be described.

본 발명의 리튬이온전지에 사용되고 있는 정극 및 부극과 같은 전극은 활물질로 리튬-천이금속산화물 및 카본, 카본복합체를 사용하고, 바인더로 PVDF와 SBR을 함께 포함한 혼합 바인더를 사용하는 것이며 유기 용매로 NMP를 사용하여서, 이들을 혼합하므로 슬러리를 제조한다. 여기서 특히 정극 활물질은 도전성이 없기 때문에 도전제로 카본을 더 첨가하고 있다.Electrodes such as the positive electrode and the negative electrode used in the lithium ion battery of the present invention use lithium-transition metal oxide, carbon, and carbon composite as an active material, and use a mixed binder including PVDF and SBR as a binder, and NMP as an organic solvent. Using to form a slurry by mixing them. In particular, since the positive electrode active material is not conductive, carbon is further added as a conductive agent.

먼저 본 발명에서는 혼합 바인더를 사용함에 있어 전극 제조후 활물질과 기재의 균일한 접착력을 실현하기 위해, 2종 바인더에 약산을 첨가하여 상호 같은 수준의 접착력을 갖추도록 한다.First, in the present invention, in order to realize a uniform adhesive force between the active material and the substrate after manufacturing the electrode in the use of the mixed binder, the weak acid is added to the two binders to have the same level of adhesive strength.

보다 구체적으로 PVDF는 SBR에 비하여 상대적으로 접착력이 약한 것이므로, 본 발명에서는 이를 강화하기 위해 약산을 첨가하고 있다. 약산은 작용기를 갖는 것이며, PVDF와 화학적으로 결합하여 SBR과 같은 수준까지 접착력을 향상시킨다. 약산은 PVDF에 대하여 무게비 0.1∼0.6중량％의 범위로 미량 첨가되는 것인 바, 그 첨가량은 0.1중량％ 미만일 경우 효과가 미약하게 되고, 0.6중량％를 초과할 경우에는 오히려 역효과를 나타내게 된다.More specifically, since PVDF is relatively weak in adhesive strength compared to SBR, in the present invention, a weak acid is added to reinforce it. Weak acid It has a functional group and chemically binds with PVDF to improve adhesion to the same level as SBR. When the weak acid is added in a small amount in the range of 0.1 to 0.6% by weight with respect to PVDF, the amount is less than 0.1% by weight, the effect is weak, when the amount exceeds 0.6% by weight is rather adverse effect.

약산과의 화학적 결합에 의해 접착력이 향상된 PVDF는 기본적으로 접착력이 강한 SBR에 대하여 60∼95중량％의 무게비로 혼합되어 진다. SBR계 바인더는 자체 접착력이 강하므로 전극의 중요한 접착력을 강화시킨다.PVDF with improved adhesion by chemical bonding with weak acid is basically mixed in weight ratio of 60 to 95% by weight with respect to strong adhesion SBR. SBR-based binders have a strong self-adhesion, thereby reinforcing the important adhesion of the electrode.

따라서 본 발명에 의한 혼합 바인더는 전체적으로 접착력이 향상되는 것이며, 이에 따라 혼합 바인더는 종래 활물질 슬러리에 혼합되는 8% 보다 낮은 1∼5％의 양으로도 전극의 활물질 슬러리를 구성할 수 있는 것이며, 이것은 전극에서 활물질의 충전량을 높이도록 작용하여 결국 전지의 용량을 증대시키게 된다. 또 상기한 혼합 바인더는 전극 제조후 PVDF와 SBR이 존재하는 부분에서 균일한 접착력을 형성하므로, 전체적으로 전극 접착력의 균질성을 실현하고, 활물질의 탈락을 방지하게 된다.Therefore, the mixed binder according to the present invention is to improve the overall adhesive force, and thus the mixed binder can constitute the active material slurry of the electrode in an amount of 1 to 5% lower than 8% mixed in the conventional active material slurry, which is It acts to increase the amount of active material charged in the electrode, which eventually increases the capacity of the battery. In addition, the above-mentioned mixed binder forms a uniform adhesive force at the portion where PVDF and SBR exist after electrode production, thereby realizing homogeneity of electrode adhesive force as a whole and preventing dropping of the active material.

한편 PVDF의 접착력 향상을 위해 첨가된 약산은 기재의 제조 공정에서 그 표면에 잔류하는 방청유를 제거하므로, 전극 활물질과 기재의 접착력을 향상시키고 전극 활물질과 기재가 직접 접촉되도록 하는 것이며, 그로 인하여 저항을 감소하고 전도도를 향상시킴으로써 결국 전지의 충, 방전특성을 향상시키게 된다.On the other hand, the weak acid added to improve the adhesion of PVDF removes the rust-preventive oil remaining on the surface of the substrate during the manufacturing process, thereby improving the adhesion between the electrode active material and the substrate and allowing the electrode active material and the substrate to be in direct contact with each other. By reducing and improving the conductivity, the charging and discharging characteristics of the battery are improved.

이상에서 설명한 바와 같이 얻어진 이차전지의 혼합 바인더는 NMP로 된 유기 용매 및 부극 활물질인 카본과 함께 혼합하여 교반함으로써 부극 활물질 슬러리로 제조죄어 진다. 또 정극 활물질 슬러리의 경우에는 상기 혼합 바인더와, NMP로 된 유기 용매, 카본으로 된 도전제 및 리튬-천이금속산화물로 된 활물질을 함께 혼합하여 교반함으로써 제조되어 진다.The mixed binder of the secondary battery obtained as described above is manufactured into a negative electrode active material slurry by mixing and stirring together with an organic solvent of NMP and carbon as a negative electrode active material. In the case of the positive electrode active material slurry, the mixed binder and the organic solvent made of NMP, the conductive material made of carbon, and the active material made of lithium-transition metal oxide are mixed together and stirred.

정극 및 부극 활물질 슬러리는 교반 공정을 거쳐 기재의 표면에 코팅되고, 건조, 롤 프레스 및 절단 공정을 거쳐 전극 극판으로 제조된다.The positive electrode and negative electrode active material slurries are coated on the surface of the substrate through a stirring process, and are manufactured into electrode electrode plates through drying, roll pressing, and cutting processes.

이와 같이 제조된 본 발명의 전극은 세퍼레이터를 개재하여 안쪽에 정극을 배치한 상태에서 맨드릴을 이용하여 권취되는 것이며, 캔의 내부로 수납되고, 전해액을 주입한 후 상기 캔의 개구에 가스켓을 개재하여 캡 어셈블리를 밀봉함으로써 이차전지로 제조되어 진다.The electrode of the present invention manufactured as described above is wound using a mandrel with a positive electrode disposed inside the separator, and is accommodated in the can, and the electrolyte is injected into the opening of the can through a gasket. It is made of a secondary battery by sealing the cap assembly.

이상에서 설명한 구성 및 작용을 통하여 알 수 있는 바와 같이, 본 발명에 의한 이차전지의 전극 바인더와 이를 이용한 활물질 슬러리의 제조방법은 종래 기술의 문제점을 실질적으로 해소하고 있다.As can be seen through the configuration and operation described above, the electrode binder of the secondary battery according to the present invention and the method for producing an active material slurry using the same substantially solve the problems of the prior art.

즉, 본 발명은 활물질과 기재의 접착력 향상을 위해 혼합 바인더를 사용하고 여기에 약산을 첨가하여 2종 바인더의 접착력을 균일하게 함으로써, 전극 제조후 접착력의 균질성을 달성하고 활물질의 탈락을 방지하는 것이며, 그에 따른 수명 향상 효과를 얻을 수 있다.That is, the present invention uses a mixed binder to improve the adhesion between the active material and the substrate and adds a weak acid to make the adhesive strength of the two binders uniform, thereby achieving homogeneity of adhesive force after electrode production and preventing dropping of the active material. As a result, a lifespan improvement effect can be obtained.

또 활물질 슬러리에 첨가되는 약산은 기재의 압연 공정에서 그 표면에 묻어있던 방청유를 제거하므로, 활물질과 기재의 접착력을 높이고, 활물질과 기재의 직접 접촉에 의해 내부 저항 감소 및 전도도를 향상시키는 것이며, 결국 전지의 수명과 고율 충, 방전특성을 향상시키게 된다.In addition, the weak acid added to the active material slurry removes the rust-preventive oil from the surface of the substrate during the rolling process, thereby increasing the adhesion between the active material and the substrate and reducing the internal resistance and the conductivity by the direct contact between the active material and the substrate. It improves battery life, high rate charging and discharging characteristics.

아울러 본 발명에 의하면 접착력이 향상된 혼합 바인더의 사용으로 활물질의 충진량과 그에 따른 전지 용량의 향상 효과를 얻을 수 있다.In addition, according to the present invention it is possible to obtain an effect of improving the amount of filling the active material and the battery capacity according to the use of the mixed binder with improved adhesion.

Claims (8)

폴리비닐리덴 플로라이드에 대한 일정 무게비로 약산을 첨가하고, 여기에 스틸렌 부타디엔 러버를 혼합하여 얻어짐을 특징으로 하는 이차전지의 전극 바인더.A secondary battery electrode binder, which is obtained by adding a weak acid at a predetermined weight ratio to polyvinylidene fluoride and mixing styrene butadiene rubber thereto. 제 1 항에 있어서, 약산은 폴리비닐리덴 플로라이드에 대하여 0.1∼0.6중량％가 첨가되고, 폴리비닐리덴 플로라이드는 스틸렌 부타디엔 러버에 대하여 60∼95중량％가 혼합된 것임을 특징으로 하는 이차전지의 전극 바인더.The secondary battery of claim 1, wherein the weak acid is added in an amount of 0.1 to 0.6 wt% based on the polyvinylidene fluoride, and the polyvinylidene fluoride is mixed in an amount of 60 to 95 wt% based on the styrene butadiene rubber. Electrode binder. 폴리비닐리덴 플로라이드와 스틸렌 부타디엔 러버가 혼합된 바인더에 미량의 약산을 첨가하여 2종 바인더의 접착력을 상호 같게 하고, 이것을 카본으로 된 활물질과 N-메틸 피롤리돈으로 된 유기 용매와 함께 혼합 및 교반하여 얻어짐을 특징으로 하는 이차전지의 부극 활물질 슬러리의 제조방법.A small amount of weak acid is added to the binder mixed with polyvinylidene fluoride and styrene butadiene rubber to equalize the adhesion of the two binders, which is mixed with an active material made of carbon and an organic solvent made of N-methyl pyrrolidone and It is obtained by stirring, The manufacturing method of the negative electrode active material slurry of a secondary battery. 제 3 항에 있어서, 혼합된 바인더는 활물질에 대하여 1∼5중량％로 혼합된 것임을 특징으로 하는 이차전지의 부극 활물질 슬러리의 제조방법.The method of manufacturing a negative electrode active material slurry of a secondary battery according to claim 3, wherein the mixed binder is mixed at an amount of 1 to 5% by weight based on the active material. 제 3 항 또는 제 4 항에 있어서, 약산은 폴리비닐리덴 플로라이드에 대하여 0.1∼0.6중량％가 첨가되고, 폴리비닐리덴 플로라이드는 스틸렌 부타디엔 러버에 대하여 60∼95중량％가 혼합된 것임을 특징으로 하는 이차전지의 부극 활물질 슬러리의 제조방법.The weak acid is 0.1 to 0.6% by weight based on the polyvinylidene fluoride, the polyvinylidene fluoride is characterized in that 60 to 95% by weight relative to the styrene butadiene rubber A method for producing a negative electrode active material slurry of a secondary battery. 폴리비닐리덴 플로라이드와 스틸렌 부타디엔 러버가 혼합된 바인더에 미량의 약산을 첨가하여 2종 바인더의 접착력을 상호 같게 하고, 이것을 리튬-천이금속산화물로 된 활물질과 N-메틸 피롤리돈으로 된 유기 용매 및 카본으로 된 도전제와 함께 혼합 및 교반하여 얻어짐을 특징으로 하는 이차전지의 정극 활물질 슬러리의 제조방법.A small amount of weak acid is added to the binder mixed with polyvinylidene fluoride and styrene butadiene rubber to make the adhesion of the two binders the same, and this is an active material of lithium-transition metal oxide and an organic solvent of N-methyl pyrrolidone. And mixing and stirring together with the conductive agent made of carbon. 제 6 항에 있어서, 혼합된 바인더는 활물질에 대하여 1∼5중량％로 혼합된 것임을 특징으로 하는 이차전지의 정극 활물질 슬러리의 제조방법.The method of claim 6, wherein the mixed binder is mixed at an amount of 1 to 5% by weight based on the active material. 제 6 항 또는 제 7 항에 있어서, 약산은 폴리비닐리덴 플로라이드에 대하여 0.1∼0.6중량％가 첨가되고, 폴리비닐리덴 플로라이드는 스틸렌 부타디엔 러버에 대하여 60∼95중량％가 혼합된 것임을 특징으로 하는 이차전지의 정극 활물질 슬러리의 제조방법.The method of claim 6 or 7, wherein the weak acid is 0.1 to 0.6% by weight based on the polyvinylidene fluoride, polyvinylidene fluoride is characterized in that 60 to 95% by weight relative to the styrene butadiene rubber The manufacturing method of the positive electrode active material slurry of the secondary battery.
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