KR20150045833A - Method for fabricating positive electrode material absorbed with binder, positive electrode material absorbed with binder and positive electrode comprising the same - Google Patents

Method for fabricating positive electrode material absorbed with binder, positive electrode material absorbed with binder and positive electrode comprising the same Download PDF

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KR20150045833A
KR20150045833A KR20130125602A KR20130125602A KR20150045833A KR 20150045833 A KR20150045833 A KR 20150045833A KR 20130125602 A KR20130125602 A KR 20130125602A KR 20130125602 A KR20130125602 A KR 20130125602A KR 20150045833 A KR20150045833 A KR 20150045833A
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active material
positive electrode
electrode active
binder resin
cathode active
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KR20130125602A
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Korean (ko)
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최주영
김우하
김여진
홍슬기
도현경
권현수
김강근
노현철
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주식회사 엘지화학
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Publication of KR20150045833A publication Critical patent/KR20150045833A/en

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/62Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621Binders
    • H01M4/622Binders being polymers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/131Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/36Selection of substances as active materials, active masses, active liquids
    • H01M4/48Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/36Selection of substances as active materials, active masses, active liquids
    • H01M4/48Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525Selection 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/62Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624Electric conductive fillers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The present invention relates to a method for manufacturing a positive electrode active material; a positive electrode active material with binder resin adsorbed thereto which is manufactured by the same method; and an electrode for a secondary battery including the same positive electrode active material. The method includes the following steps: mixing the positive electrode active material with resin powder by agitating the positive electrode active material and adding the resin powder into the positive electrode active material; and performing heat treatment on the mixture of the binder resin and the positive electrode active material.

Description

바인더 수지가 흡착된 양극 활물질의 제조 방법, 상기 방법에 의해 제조된 양극 활물질 및 이를 포함하는 이차전지용 양극{METHOD FOR FABRICATING POSITIVE ELECTRODE MATERIAL ABSORBED WITH BINDER, POSITIVE ELECTRODE MATERIAL ABSORBED WITH BINDER AND POSITIVE ELECTRODE COMPRISING THE SAME}BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive electrode active material, a positive electrode active material, and a positive electrode active material,

본 발명은 바인더 수지가 흡착된 양극 활물질의 제조 방법, 상기 방법에 의해 제조된 양극 활물질 및 이를 포함하는 이차전지용 양극에 관한 것이다.The present invention relates to a method for producing a positive electrode active material on which a binder resin is adsorbed, a positive electrode active material produced by the method, and a positive electrode for a secondary battery comprising the same.

최근 휴대용 소형 전자기기에 대한 기술 개발과 수요가 증가함에 따라, 이들의 전원으로 사용되는 이차전지에 대한 수요가 급격히 증가하고 있다. 2. Description of the Related Art [0002] With the recent development and demand for portable electronic devices, there is a rapid increase in the demand for secondary batteries used as power sources for such portable electronic devices.

특히, 리튬 이차전지는 유기 전해액을 사용하여, 기존의 알칼리 수용액을 사용하는 전지보다 2배 이상의 높은 방전 전압과, 높은 에너지 밀도를 갖는 것이 특징이다. 리튬 이차전지는 통상적으로 양극 집전체의 적어도 일면에 양극 활물질층을 형성한 양극, 음극 집전체의 적어도 일면에 음극 활물질층을 형성한 음극 및 상기 양극과 음극의 사이에 개재되어 이들을 전기적으로 절연시키는 세퍼레이터를 구비한다. 또한, 상기 양극 및 음극은 양극 또는 음극 활물질 슬러리를 집전체에 직접 도포 및 건조시켜 형성하거나, 또는 전극 활물질 슬러리를 별도의 지지체 상부에 도포 및 건조시킨 다음, 이 지지체로부터 박리한 필름을 집전체 상에 라미네이션하는 방법에 의해 형성된다.Particularly, the lithium secondary battery uses an organic electrolytic solution and is characterized by having a discharge voltage and a high energy density twice as high as those of a battery using an existing alkaline aqueous solution. The lithium secondary battery generally comprises a positive electrode having a positive electrode active material layer formed on at least one surface of a positive electrode current collector, a negative electrode having a negative electrode active material layer formed on at least one surface of the negative electrode current collector and a negative electrode interposed between the positive electrode and the negative electrode, And a separator. The positive electrode and the negative electrode may be formed by applying a slurry of a positive electrode or a negative electrode active material directly to the current collector and drying or by applying the electrode active material slurry to an upper portion of a separate support and drying the film, As shown in FIG.

한편, 상기 양극 또는 음극 활물질 슬러리는 전극 활물질, 바인더 수지 및 전극의 도전성 향상을 위해 도전재를 포함한다. 이때, 상기 도전재 입자들이 전극 활물질 슬러리 내에서 균일하게 분산되어야 전극의 이온전도도가 균일하게 유지된다. Meanwhile, the anode or anode active material slurry includes a conductive material for improving the conductivity of the electrode active material, the binder resin, and the electrode. At this time, the conductive particles should be uniformly dispersed in the electrode active material slurry, so that the ion conductivity of the electrode is uniformly maintained.

하지만, 일반적인 전극 활물질 슬러리의 경우, 전극 활물질 입자, 도전재 및 바인더 수지를 동시에 혼합한 다음, 분산시키는 통상적인 분산방법을 이용하여 제조하기 때문에, 전극 활물질 입자 및 바인더 수지와 도전재 입자 간의 크기 및 비중 등의 차이로 인하여 도전재 입자들이 슬러리 내에 균일하게 분산되기 어려워, 바인더 수지와 도전재의 뭉침 현상이 유발된다. 이 경우, 셀의 저항이 증가하면서, 전압 강하가 야기되어, 원활한 리튬 이온의 이동이 차단되기 때문에, 전극의 율 (rate) 특성의 저하를 가져 온다. However, in the case of a general electrode active material slurry, since the electrode active material particles, the conductive material, and the binder resin are mixed at the same time and then dispersed, the electrode active material particles and the binder resin and the conductive material particles, It is difficult for the conductive material particles to be uniformly dispersed in the slurry due to the difference in specific gravity and the like, so that the binder resin and the conductive material are aggregated. In this case, as the resistance of the cell increases, a voltage drop is caused and smooth lithium ion movement is interrupted, resulting in a decrease in the rate characteristic of the electrode.

종래 이러한 문제점을 개선하기 위하여, 특별히 고안된 분산장치를 통해 전극 활물질 및 바인더 수지와 도전제 입자들의 분산성을 향상시키는 방법 등이 제안되었다. 하지만, 이러한 방법들은 특별한 분산장치를 필요로 하거나 제조공정이 번거롭다는 단점이 있다. 더욱이, 전극 활물질 슬러리 내에서 도전재 입자들의 분산성 개선에 한계가 있었다. In order to solve such problems, a method of improving the dispersibility of the electrode active material, the binder resin and the conductive agent particles through a specially designed dispersing device has been proposed. However, these methods are disadvantageous in that they require a special dispersing device or a complicated manufacturing process. Furthermore, there has been a limit to improving the dispersibility of the conductive material particles in the electrode active material slurry.

이에, 높은 고용량 이차전지를 제조하기 위해, 전극 슬러리 내에서 전극 활물질과 바인더 수지 및 도전재 입자 등의 분산성을 향상시킬 수 있는 방법의 개발이 시급한 실정이다.Therefore, in order to produce a high capacity secondary battery, it is urgently required to develop a method capable of improving the dispersibility of the electrode active material, the binder resin, and the conductive material particles in the electrode slurry.

본 발명에서는 표면에 바인더 수지가 흡착된 양극 활물질의 제조 방법과, 이러한 방법에 의해 제조된 바인더 수지가 흡착된 양극 활물질을 제공한다.The present invention provides a method for producing a positive electrode active material on which a binder resin is adsorbed on a surface thereof and a positive electrode active material on which a binder resin produced by such a method is adsorbed.

또한, 본 발명에서는 상기 바인더 수지가 흡착된 양극 활물질 및 도전재를 포함하는 이차전지용 양극을 제공한다.The present invention also provides a positive electrode for a secondary battery comprising the positive electrode active material on which the binder resin is adsorbed and a conductive material.

구체적으로, 본 발명에서는Specifically, in the present invention,

양극 활물질을 교반하면서 바인더 수지 분말을 투입한 후 혼합하는 단계; 및Mixing and stirring the binder resin powder while stirring the positive electrode active material; And

상기 바인더 수지 분말 및 양극 활물질의 혼합물을 열처리하는 단계를 포함하는 바인더 수지가 흡착된 양극 활물질의 제조 방법을 제공한다. And heat treating the mixture of the binder resin powder and the cathode active material. The present invention also provides a method of manufacturing a cathode active material adsorbed thereon.

또한, 본 발명에서는 상기 방법에 의해 제조된 바인더 수지가 흡착된 양극 활물질을 제공한다.In addition, the present invention provides a positive electrode active material on which a binder resin produced by the above method is adsorbed.

또한, 본 발명에서는 상기 바인더 수지가 흡착된 양극 활물질 및 도전재를 포함하는 이차전지용 양극을 제공한다.The present invention also provides a positive electrode for a secondary battery comprising the positive electrode active material on which the binder resin is adsorbed and a conductive material.

본 발명에서는 양극 활물질 표면에 바인더 수지를 흡착시킨 다음, 도전재 입자와 혼합함으로써, 양극 활물질 슬러리 내에서 도전재 입자들의 분산성을 향상시켜 이온전도도가 균일하게 유지된 전극을 제조할 수 있다.In the present invention, the binder resin is adsorbed on the surface of the cathode active material and then mixed with the conductive material particles, thereby improving the dispersibility of the conductive material particles in the cathode active material slurry, and thus the electrode having uniform ion conductivity can be manufactured.

이하, 본 발명에 대한 이해를 돕기 위해 본 발명을 더욱 상세하게 설명한다. 이때, 본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니 되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다.
Hereinafter, the present invention will be described in detail in order to facilitate understanding of the present invention. Herein, terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings, and the inventor may appropriately define the concept of the term to describe its own invention in the best way. It should be construed as meaning and concept consistent with the technical idea of the present invention.

구체적으로, 본 발명의 일 실시예에서는 Specifically, in one embodiment of the present invention

양극 활물질을 교반하면서 바인더 수지 분말을 투입하여 혼합하는 단계; 및Mixing and mixing the binder resin powder while stirring the cathode active material; And

상기 바인더 수지 분말 및 양극 활물질의 혼합물을 열처리하는 단계를 포함하는 바인더 수지가 흡착된 양극 활물질의 제조 방법.
And heat treating the mixture of the binder resin powder and the positive electrode active material.

상기 본 발명의 방법에 있어서, 양극 활물질과 바인더 수지 분말을 혼합하는 단계는 비용매 조건 하에서, 분말들을 혼합하는 일반적인 볼밀 공정 등을 통해 실시할 수 있다.In the method of the present invention, the step of mixing the cathode active material and the binder resin powder may be carried out by a general ball mill process or the like in which powders are mixed under non-solvent conditions.

또한, 상기 양극 활물질은 당업계에서 통상적으로 사용되는 리튬 함유 금속 산화물이면 모두 사용가능하며, 그 비제한적인 예로 LiCoO2, LiMn2O4, LiNiO2, LiFeO2, LiFePO4, V2O5, TiS 및 LiMeO2 (이때, Me는 Ni, Mn, Co)로 이루어진 군으로부터 선택된 단일물 또는 2종 이상의 혼합물을 사용할 수 있다.The cathode active material may be any lithium-containing metal oxide conventionally used in the art, and examples thereof include LiCoO 2 , LiMn 2 O 4 , LiNiO 2 , LiFeO 2 , LiFePO 4 , V 2 O 5 , TiS and LiMeO 2 (where Me is Ni, Mn, Co), or a mixture of two or more of them.

또한, 상기 바인더 수지는 폴리비닐피롤리돈 (PVP), 폴리테트라플루오로에틸렌 (PTFE), 폴리비닐리덴플루오라이드(PVdF), 비닐리덴플루오라이드-헥사플루오로프로필렌 공중합체, 폴리비닐리덴플루오라이드, 폴리우레탄, 폴리에틸렌옥사이드, 폴리아크릴로니트릴, 폴리메틸메타크릴레이트, 폴리아크릴아미드 및 폴리아세테이트로 이루어진 군으로부터 선택된 어느 하나 또는 이들 중 2종 이상의 혼합물을 들 수 있으며, 바람직하게 폴리비닐리덴플루오라이드를 들 수 있다.The binder resin may be at least one selected from the group consisting of polyvinylpyrrolidone (PVP), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), vinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride , Polyurethane, polyethylene oxide, polyacrylonitrile, polymethyl methacrylate, polyacrylamide and polyacetate, or a mixture of two or more thereof, preferably polyvinylidene fluoride .

이때, 상기 바인더 수지 분말의 함량은 전기차(Electric Vehicle, EV), 하이브리드 전기차(Hybrid Electric Vehicle, HEV), 및 플러그인 하이브리드 전기차(Plug-in Hybrid Electric Vehicle, PHEV)를 포함하는 전기차 등에 사용되는 중대형 전지팩용 셀에 따라 달라 질 수 있으며, 구체적으로 상기 바인더 수지 분말의 함량은 양극 활물질의 전체 중량을 기준으로 하여 약 10 중량% 이하를 초과하지 않는 것이 바람직하다. 또한, 상기 바인더 수지 분말의 함량은 양극 활물질 슬러리 내에 함유되는 도전재의 함량에 따라 증가할 수 있는데, 구체적으로 양극 활물질 슬러리 내에서 도전재와 바인더 수지의 비율은 1 내지 4:1인 것이 바람직하다. 만약 도전재 : 바인더 수지의 혼합비가 5:1일 경우, 양극 슬러리 내에서 도전재 뭉침 등의 양극 믹싱 문제가 발생할 수 있다. At this time, the content of the binder resin powder may be appropriately selected depending on the amount of the binder resin powder used in the middle- or large-sized battery used in an electric vehicle including an electric vehicle (EV), a hybrid electric vehicle (HEV), and a plug-in hybrid electric vehicle (PHEV) The content of the binder resin powder is preferably not more than about 10% by weight based on the total weight of the cathode active material. The content of the binder resin powder may be increased depending on the content of the conductive material contained in the slurry of the cathode active material. Specifically, the ratio of the conductive material to the binder resin in the slurry of the cathode active material is preferably 1: 4 to 1: 1. If the mixing ratio of the conductive material: binder resin is 5: 1, there may be a problem of mixing of the positive electrode in the positive electrode slurry, such as clumping of the conductive material.

또한, 본 발명의 방법에 있어서, 상기 열처리 단계는 상기 바인더 수지의 용융점 이상의 온도 내지 상기 양극 활물질의 합성 온도 이하의 온도 범위 내에서 실시할 수 있다.Further, in the method of the present invention, the heat treatment step may be carried out within a temperature range from a temperature above the melting point of the binder resin to a temperature below the synthesis temperature of the cathode active material.

구체적으로, 상기 열처리 단계는 air 분위기, 대기 압력하에서 300 내지 500℃로 5 내지 10 시간 동안 실시하는 것이 바람직하다.Specifically, the heat treatment step is preferably performed at 300 to 500 ° C for 5 to 10 hours under air atmosphere and atmospheric pressure.

상기 열처리 단계 시에 바인더 수지 분말이 용융되면서, 양극 활물질 표면에 입자 형태로 흡착되거나, 전면 코팅되는 형태로 균일하게 흡착될 수 있다.
In the heat treatment step, the binder resin powder may be melted and adsorbed uniformly on the surface of the cathode active material in the form of particles or in the form of a front coating.

또한, 본 발명의 일 실시예에서는 상기 본 발명의 방법에 의해 제조된 바인더 수지가 흡착된 양극 활물질을 제공한다.
Also, in one embodiment of the present invention, there is provided a positive electrode active material on which a binder resin produced by the method of the present invention is adsorbed.

또한, 본 발명의 일 실시예에서는 In an embodiment of the present invention,

전극 집전체, 및 상기 전극 집전체 상에 도포된 양극 활물질 슬러리를 포함하며, 상기 양극 활물질 슬러리는 본 발명의 바인더 수지가 흡착된 양극 활물질, 도전재 및 용매를 포함하는 이차전지용 양극을 제공한다.And a positive electrode active material slurry applied on the electrode current collector, wherein the positive electrode active material slurry provides a positive electrode for a secondary battery comprising a positive electrode active material on which a binder resin of the present invention is adsorbed, a conductive material and a solvent.

이때, 상기 전극 집전체는 양극 집전체로서, 당해 전지에 화학적 변화를 유발하지 않으면서 도전성을 가진 것이라면 특별히 제한하지 않으며, 예를 들면, 스테인리스 스틸, 알루미늄, 니켈, 티탄, 소성 탄소, 또는 알루미늄이나 스테인리스 스틸의 표면에 카본, 니켈, 티탄, 은 등으로 표면 처리한 것 등이 사용될 수 있다.The electrode current collector is not particularly limited as long as it is a positive electrode collector that has conductivity without causing chemical changes in the battery. Examples of the current collector include stainless steel, aluminum, nickel, titanium, A surface treated with carbon, nickel, titanium, or silver on the surface of stainless steel may be used.

상기 본 발명의 이차전지용 양극은 상기 바인더 수지가 흡착된 양극 활물질 및 도전재 분말을 용매에 분산시켜 슬러리를 제조한 다음, 이를 양극 집전체 표면에 도포하고, 건조 및 압축하는 방법에 의해 제조할 수 있다.The positive electrode for a secondary battery of the present invention can be prepared by dispersing the binder resin-adsorbed positive electrode active material and conductive material powder in a solvent to prepare a slurry, applying the slurry to the surface of the positive electrode collector, have.

이때, 상기 용매로는 N-메틸피롤리돈 등의 분산 용매가 사용될 수 있으며, 이에 한정되지 않고, 통상적인 유기용매가 사용될 수 있다. At this time, as the solvent, a dispersion solvent such as N-methylpyrrolidone may be used, but not limited thereto, a conventional organic solvent may be used.

상기 슬러리 도포 방법으로는 스프레이 코팅법, 스핀 코팅법 또는 닥터 블레이드 법 등을 이용할 수 있다.As the slurry application method, a spray coating method, a spin coating method, a doctor blade method, or the like can be used.

또한, 본 발명의 양극에 있어서, 상기 도전재는 당해 전지에 화학적 변화를 유발하지 않으면서 도전성을 가진 것이라면 특별히 제한되지 않으며, 예를 들면 천연 흑연이나 인조 흑연 등의 흑연; 카본블랙, 아세틸렌 블랙, 케첸 블랙, 채널블랙, 퍼네이스 블랙, 램프 블랙, 서머 블랙 등의 카본블랙; 탄소 섬유나 금속 섬유 등의 도전성 섬유; 불화 카본, 알루미늄, 니켈 분말 등의 금속 분말; 산화아연, 티탄산 칼륨 등의 도전성 위스키; 산화 티탄 등의 도전성 금속 산화물; 폴리페닐렌 유도체 등의 도전성 소재 등이 사용될 수 있다.In the anode of the present invention, the conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

이때, 본 발명의 이차전지용 양극에 있어서, 상기 도전재는 양극 활물질 슬러리 전체 중량을 기준으로 약 2 내지 15 중량%로 첨가된다. 만약, 상기 도전재의 함량이 2 중량% 이하이면 셀의 전도성 저하에 따른 저항 증가가 유발된다. 또한, 도전재 함량이 15 중량%를 초과하는 경우에 양극 활물질 슬러리 내에서 도전재 뭉침 현상에 의한 코팅 불량이 나타나므로, 셀 저항을 유발한다.
At this time, in the anode for a secondary battery of the present invention, the conductive material is added in an amount of about 2 to 15% by weight based on the total weight of the cathode active material slurry. If the content of the conductive material is less than 2 wt%, the resistance of the cell is increased due to the decrease of the conductivity of the cell. In addition, when the conductive material content exceeds 15% by weight, coating defects due to the aggregation of the conductive material occur in the slurry of the cathode active material, thereby causing cell resistance.

전술한 바와 같이, 본 발명에서는 표면에 바인더 수지가 균일하게 형성된 양극 활물질과 도전재 입자를 포함하는 양극 활물질 슬러리를 제조함으로써, 전극 활물질 슬러리 내에서 도전재 입자들의 분산성을 향상시킬 수 있다. 이에 따라, 도전재 입자와 바인더 수지의 뭉침 현상을 개선하여, 양극 집전체 상에 균일하게 도포된 양극 활물질층을 형성할 수 있으므로, 양극의 접착력을 증가시킬 수 있다. 그 결과, 셀의 출력 증가 및 고온 수명 개선 효과를 얻을 수 있다. As described above, in the present invention, the dispersibility of the conductive material particles in the electrode active material slurry can be improved by producing the cathode active material slurry including the cathode active material and the conductive material particles having the binder resin uniformly formed on the surface thereof. As a result, the agglomeration phenomenon of the conductive material particles and the binder resin is improved, and the positive electrode active material layer uniformly applied on the positive electrode collector can be formed, so that the adhesion of the positive electrode can be increased. As a result, it is possible to obtain an effect of increasing the output of the cell and improving the high-temperature lifetime.

Claims (11)

양극 활물질을 교반하면서 바인더 수지 분말을 투입하여 혼합하는 단계; 및
상기 바인더 수지 분말 및 양극 활물질의 혼합물을 열처리하는 단계를 포함하는 바인더 수지가 흡착된 양극 활물질의 제조 방법.
Mixing and mixing the binder resin powder while stirring the cathode active material; And
And heat treating the mixture of the binder resin powder and the positive electrode active material.
청구항 1에 있어서,
상기 양극 활물질과 바인더 수지 분말을 혼합하는 단계는 비용매 조건 하에서, 볼밀 공정을 이용하여 실시하는 것을 특징으로 하는 바인더 수지가 흡착된 양극 활물질의 제조 방법.
The method according to claim 1,
Wherein the step of mixing the positive electrode active material and the binder resin powder is carried out using a ball mill process under a non-solvent condition.
청구항 1에 있어서,
상기 양극 활물질은 LiCoO2, LiMn2O4, LiNiO2, LiFeO2, LiFePO4, V2O5, TiS 및 LiMeO2 (이때, Me는 Ni, Mn, Co)로 이루어진 군으로부터 선택된 단일물 또는 2종 이상의 혼합물인 것을 특징으로 하는 양극 활물질의 제조 방법.
The method according to claim 1,
The cathode active material may be a single or a mixture selected from the group consisting of LiCoO 2 , LiMn 2 O 4 , LiNiO 2 , LiFeO 2 , LiFePO 4 , V 2 O 5 , TiS and LiMeO 2 (where Me is Ni, By weight based on the total weight of the positive electrode active material.
청구항 1에 있어서,
상기 바인더 수지는 폴리비닐피롤리돈 (PVP), 폴리테트라플루오로에틸렌 (PTFE), 폴리비닐리덴플루오라이드(PVdF), 비닐리덴플루오라이드-헥사플루오로프로필렌 공중합체, 폴리비닐리덴플루오라이드, 폴리우레탄, 폴리에틸렌옥사이드, 폴리아크릴로니트릴, 폴리메틸메타크릴레이트, 폴리아크릴아미드 및 폴리아세테이트로 이루어진 군으로부터 선택된 어느 하나 또는 이들 중 2종 이상의 혼합물인 것을 특징으로 하는 양극 활물질의 제조 방법.
The method according to claim 1,
The binder resin may be selected from the group consisting of polyvinylpyrrolidone (PVP), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), vinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride, poly Wherein the positive electrode active material is one selected from the group consisting of urethane, polyethylene oxide, polyacrylonitrile, polymethyl methacrylate, polyacrylamide and polyacetate, or a mixture of two or more thereof.
청구항 1에 있어서,
상기 바인더 수지 분말의 함량은 전극 활물질의 전체 중량을 기준으로 하여 10 중량% 이하인 것을 특징으로 하는 양극 활물질의 제조 방법.
The method according to claim 1,
Wherein the content of the binder resin powder is 10 wt% or less based on the total weight of the electrode active material.
청구항 1에 있어서,
상기 열처리 단계는 상기 바인더 수지의 용융점 이상 내지 상기 양극 활물질의 합성 온도 이하의 온도 범위 내에서 실시하는 것을 특징으로 하는 양극 활물질의 제조 방법.
The method according to claim 1,
Wherein the heat treatment is performed within a temperature range from a melting point of the binder resin to a synthesis temperature or lower of the cathode active material.
청구항 1에 있어서,
상기 열처리 단계는 공기(air) 분위기의 대기 압력하에서 300 내지 500℃로 5 내지 10 시간 동안 실시하는 것을 특징으로 하는 양극 활물질의 제조 방법.
The method according to claim 1,
Wherein the heat treatment is performed at 300 to 500 DEG C for 5 to 10 hours under atmospheric pressure in an air atmosphere.
청구항 1의 방법에 의해 제조된 바인더 수지가 흡착된 양극 활물질.A positive electrode active material adsorbed on a binder resin produced by the method of claim 1. 전극 집전체, 및
상기 전극 집전체 상에 도포된 양극 활물질 슬러리를 포함하며,
상기 양극 활물질 슬러리는 청구항 8에 기재된 바인더 수지가 흡착된 양극 활물질, 도전재 및 용매를 포함하는 것을 특징으로 하는 이차전지용 양극.
Electrode collector, and
And a cathode active material slurry applied on the electrode current collector,
Wherein the positive electrode active material slurry includes the positive electrode active material on which the binder resin according to claim 8 is adsorbed, a conductive material, and a solvent.
청구항 9에 있어서,
상기 도전재의 함량은 양극 활물질 슬러리의 전체 중량을 기준으로 약 2 내지 15 중량%인 것을 특징으로 하는 이차전지용 양극.
The method of claim 9,
Wherein the content of the conductive material is about 2 to 15% by weight based on the total weight of the cathode active material slurry.
청구항 9에 있어서,
상기 양극 활물질 슬러리 내에서 도전재와 바인더 수지의 함량비는 1 내지 4:1인 것을 특징으로 하는 이차전지용 양극.
The method of claim 9,
Wherein the content ratio of the conductive material and the binder resin in the positive electrode active material slurry is 1 to 4: 1.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190090545A (en) * 2018-01-25 2019-08-02 주식회사 엘지화학 Positive electrode for lithium secondary battery, method for preparing the same and lithium secondary battery comprising the same
WO2023080514A1 (en) * 2021-11-03 2023-05-11 주식회사 엘지화학 Manufacturing method of positive electrode current collector coated with adhesion enhancement layer, positive electrode current collector coated with adhesion enhancement layer manufactured thereby, manufacturing method of positive electrode for lithium secondary battery, positive electrode for lithium secondary battery manufactured thereby, and lithium secondary battery comprising same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190090545A (en) * 2018-01-25 2019-08-02 주식회사 엘지화학 Positive electrode for lithium secondary battery, method for preparing the same and lithium secondary battery comprising the same
WO2023080514A1 (en) * 2021-11-03 2023-05-11 주식회사 엘지화학 Manufacturing method of positive electrode current collector coated with adhesion enhancement layer, positive electrode current collector coated with adhesion enhancement layer manufactured thereby, manufacturing method of positive electrode for lithium secondary battery, positive electrode for lithium secondary battery manufactured thereby, and lithium secondary battery comprising same

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