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KR20150082958A - Electrode for secondary battery and Method for manufacturing the same - Google Patents

Electrode for secondary battery and Method for manufacturing the same Download PDF

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Publication number
KR20150082958A
KR20150082958A KR1020140002523A KR20140002523A KR20150082958A KR 20150082958 A KR20150082958 A KR 20150082958A KR 1020140002523 A KR1020140002523 A KR 1020140002523A KR 20140002523 A KR20140002523 A KR 20140002523A KR 20150082958 A KR20150082958 A KR 20150082958A
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South Korea
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electrode
active material
secondary battery
electrode active
current collector
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Korean (ko)
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김영재
최상훈
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주식회사 엘지화학
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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
    • H01M4/13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • H01M4/04Processes of manufacture in general
    • H01M4/0402Methods of deposition of the material
    • H01M4/0404Methods of deposition of the material by coating on electrode collectors
    • 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
    • H01M4/139Processes of manufacture
    • 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
    • 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
    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

본 발명에 따른 이차전지용 전극은, 전극 집전체 및 상기 전극 집전체의 적어도 일 면 상에 도포된 전극 활물질을 포함하는 이차전지용 전극에 있어서, 상기 전극 활물질은 표면으로부터 일정 깊이로 형성된 음각 패턴을 구비한다.The electrode for a secondary battery according to the present invention includes an electrode current collector and an electrode active material coated on at least one surface of the electrode current collector, wherein the electrode active material has an engraved pattern formed at a predetermined depth from the surface do.

Description

이차전지용 전극 및 그 제조방법{Electrode for secondary battery and Method for manufacturing the same}TECHNICAL FIELD [0001] The present invention relates to an electrode for a secondary battery,

본 발명은 이차전지용 전극 및 그 제조방법에 관한 것으로서, 좀 더 구체적으로는 전해액에 대한 젖음성이 향상된 이차전지용 전극 및 그 제조방법에 관한 것이다.The present invention relates to an electrode for a secondary battery and a manufacturing method thereof, and more particularly, to an electrode for a secondary battery having improved wettability with respect to an electrolyte and a method of manufacturing the same.

일반적으로 전지는 분리막(separator)에 의해 서로 분리되는 양극(cathode or positive electrode)과 음극(anode or negative electrode) 및 상기 두 전극 사이에 이온 전달을 가능하게 하는 전해질을 포함하여 전기에너지를 공급할 수 있는 것이다.Generally, a battery includes a cathode or a positive electrode and an anode or a negative electrode, which are separated from each other by a separator, and an electrolyte capable of transferring ions between the two electrodes, will be.

상기 전지는 한번 사용 후 폐기되는 일차전지(일반 전지)와, 충전을 통해 재사용이 가능한 이차전지로 구분된다.The battery is divided into a primary battery (general battery), which is discarded after one use, and a secondary battery, which can be reused through charging.

근래에는 휴대폰, 노트북, PDA 등과 같은 휴대용 전자기기들의 보급으로 재충전이 가능하고 소형 및 대용량화가 가능한 이차전지의 수요량이 급증하고 있으며, 이에 따라 이차전지의 성능이 점차 개선되어 대량 생산되고 있다.2. Description of the Related Art [0002] In recent years, demand for secondary batteries which can be recharged due to the spread of portable electronic devices such as mobile phones, notebooks, and PDAs has been rapidly increasing, and the performance of secondary batteries has been gradually improved.

대표적으로는 니켈수소(Ni-MH)전지와 리튬(Li)전지 및 리튬이온(Li-ion) 전지가 사용되고 있다. 또한 이차전지는 전극조립체를 수용하고 있는 케이스의 외관에 따라서 원통형과 각형 및 파우치형 전지로 구분할 수 있다.Typically, a nickel-hydrogen (Ni-MH) battery, a lithium (Li) battery, and a lithium ion (Li-ion) battery are used. Further, the secondary battery can be divided into a cylindrical shape, a square shape, and a pouch type battery according to the appearance of the case housing the electrode assembly.

이러한 이차전지의 조립은 양극, 음극 및 분리막을 서로 번갈아가며 겹친 후, 일정 크기 및 모양의 캔(can) 혹은 파우치(pouch) 등의 전지케이스에 삽입한 후, 최종적으로 전해액을 주입함으로써 이루어진다.The secondary battery is assembled by alternately stacking the positive electrode, the negative electrode, and the separator, inserting the battery into a battery case such as a can or a pouch having a predetermined size and shape, and finally injecting the electrolyte.

이때, 나중에 주입된 전해액은 모세관 힘(capillary force)에 의해 양극, 음극 및 분리막 사이로 스며들게 되며, 이러한 전해액은 이온의 이동을 위한 매개체로서의 역할을 수행하는 것이다.At this time, the electrolyte injected later is impregnated into the space between the anode, the cathode and the separator by a capillary force, and this electrolyte plays a role as an agent for the movement of ions.

전해액의 함침이 잘 이루어지지 않는 경우에는 제조된 이차전지의 성능이 충분히 발휘될 수 없게된다.If the impregnation of the electrolyte solution is not performed well, the performance of the produced secondary battery can not be sufficiently exhibited.

그러나, 이차전지 생산 과정에 있어서, 전해액을 주입하고 이것이 전극 및 분리막에 잘 함침되도록 하는 데에는 결코 적지 않은 시간이 소요되며, 까다로운 공정 조건이 요구된다.However, in the process of producing the secondary battery, it takes a long time to inject the electrolyte solution and to impregnate the electrode and the separator with each other well, and complicated process conditions are required.

본 발명은 이러한 문제점을 고려하여 창안된 것으로서, 전해액의 젖음성을 향상시켜 전지의 성능을 향상시킬 수 이차전지용 전극 및 그 제조방법을 제공하는 것을 일 목적으로 하는 것이다.An object of the present invention is to provide an electrode for a secondary battery and a method of manufacturing the same, which can improve the wettability of the electrolyte by improving the performance of the battery.

다만, 본 발명이 이루고자 하는 기술적 과제는 상술한 과제에 제한되지 않으며, 언급되지 않은 또 다른 과제들은 아래에 기재된 발명의 설명으로부터 당업자에게 명확하게 이해될 수 있을 것이다.It is to be understood, however, that the technical subject matter of the present invention is not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

상술한 기술적 과제를 해결하기 위한 본 발명에 따른 이차전지용 전극은, 전극 집전체 및 상기 전극 집전체의 적어도 일 면 상에 도포된 전극 활물질을 포함하는 이차전지용 전극에 있어서, 상기 전극 활물질은 표면으로부터 일정 깊이로 형성된 음각 패턴을 구비한다.According to an aspect of the present invention, there is provided an electrode for a secondary battery comprising an electrode current collector and an electrode active material coated on at least one surface of the electrode current collector, And has an engraved pattern formed at a certain depth.

상기 음각 패턴은, 상기 전극 활물질의 두께 대비 5% 내지 30%의 깊이를 가질 수 있다.The engraved pattern may have a depth of 5% to 30% of the thickness of the electrode active material.

상기 음각 패턴은, 레이저 패터닝에 의해 형성될 수 있다.The engraved pattern may be formed by laser patterning.

상기 음각 패턴은, 서로 이격되어 나란하게 형성된 복수의 라인 형태를 가질 수 있다,The engraved patterns may have a plurality of line shapes spaced apart from one another and formed in parallel.

상기 음각 패턴은, 서로 이격되어 형성된 복수의 스폿(spot) 형태를 가질 수 있다.The engraved patterns may have a plurality of spot shapes spaced apart from each other.

상기 음각 패턴은, 서로 이격되어 형성된 복수의 핀-홀(pin-hole) 형태를 가질 수 있다.The engraved pattern may have a plurality of pin-hole shapes formed apart from each other.

상기 전극은, 양극 또는 음극에 해당할 수 있다.The electrode may correspond to a positive electrode or a negative electrode.

상술한 기술적 과제를 해결하기 위한 본 발명에 따른 이차전지는, 상기 이차전지용 전극이 양극 및 음극 중 적어도 어느 하나로서 적용된 것이다.According to an aspect of the present invention, there is provided a secondary battery, wherein the electrode for the secondary battery is applied as at least one of an anode and a cathode.

상술한 기술적 과제를 해결하기 위한 본 발명에 따른 이차전지용 전극 제조방법은, (a) 전극 집전체를 마련하는 단계; (b) 상기 전극 집전체의 양 면 중 적어도 어느 일 면 상에 전극 활물질을 도포하는 단계; 및 (c) 상기 전극 활물질의 표면에 레이저 패터닝에 의해 일정 깊이로 음각 패턴을 형성하는 단계를 포함한다.According to an aspect of the present invention, there is provided a method of manufacturing an electrode for a secondary battery, the method including: (a) providing an electrode current collector; (b) applying an electrode active material on at least one surface of the electrode current collector; And (c) forming an engraved pattern at a predetermined depth on the surface of the electrode active material by laser patterning.

상기(c)단계는, 상기 음각 패턴의 깊이가 상기 활물질의 두께 대비 5% 내지 30%에 해당하도록 패터닝 하는 단계에 해당할 수 있다.The step (c) may correspond to a step of patterning the depth of the engraved pattern to 5% to 30% of the thickness of the active material.

본 발명에 따르면, 이차전지용 전극에 대한 전해액 젖음성이 향상되며, 이로써 이차전지의 제조공정 효율을 향상시킬 수 있을 뿐만 아니라, 이차전지의 성능을 향상시킬 수 있다.According to the present invention, electrolyte wettability with respect to an electrode for a secondary battery is improved, thereby improving the manufacturing process efficiency of the secondary battery and improving the performance of the secondary battery.

본 명세서에 첨부되는 다음의 도면들은 본 발명의 바람직한 실시예를 예시하는 것이며, 후술되는 발명의 상세한 설명과 함께 본 발명의 기술사상을 더욱 이해시키는 역할을 하는 것이므로, 본 발명은 그러한 도면에 기재된 사항에만 한정되어 해석되어서는 아니 된다.
도 1은, 본 발명의 일 실시예에 따른 전극을 나타내는 측면도이다.
도 2 내지 도 5는, 도 1에 도시된 활물질에 형성된 다양한 음각 패턴을 나타내는 도면이다.
도 6 내지 도 8은, 도 2 내지 도 5에 도시된 음각 패턴들에 대한 현미경 사진이다.
도 9는, 도 2에 도시된 음각 패턴이 적용된 양극과 패턴이 형성되지 않은 양극에 대한 함침성을 비교한 그래프이다.
도 10은, 도 2에 도시된 음각 패턴이 적용된 음극과 패턴이 형성되지 않은 음극에 대한 함침성을 비교한 그래프이다.
BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention. And should not be construed as limiting.
1 is a side view of an electrode according to an embodiment of the present invention.
2 to 5 are views showing various engraved patterns formed on the active material shown in Fig.
Figs. 6 to 8 are photomicrographs of the engraved patterns shown in Figs. 2 to 5. Fig.
FIG. 9 is a graph comparing the impregnation properties of the positive electrode to the negative electrode to which the pattern of FIG. 2 is not formed.
FIG. 10 is a graph comparing the impregnation properties of the negative electrode to the negative electrode to which the negative pattern is applied and the negative electrode to which no pattern is formed, as shown in FIG.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명하기로 한다. 이에 앞서, 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. 따라서, 본 명세서에 기재된 실시예와 도면에 도시된 구성은 본 발명의 가장 바람직한 일부 실시예에 불과할 뿐이고 본 발명의 기술적 사상을 모두 대변하는 것은 아니므로, 본 출원시점에 있어서 이들을 대체할 수 있는 다양한 균등물과 변형예들이 있을 수 있음을 이해하여야 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only some of the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

도 1 내지 도 5를 참조하여 본 발명의 일 실시예에 따른 이차전지용 전극을 설명하기로 한다.1 to 5, an electrode for a secondary battery according to an embodiment of the present invention will be described.

도 1은, 본 발명의 일 실시예에 따른 전극을 나타내는 측면도이고, 도 2 내지 도 5는, 도 1에 도시된 활물질에 형성된 다양한 음각 패턴을 나타내는 도면이다. FIG. 1 is a side view showing an electrode according to an embodiment of the present invention, and FIGS. 2 to 5 are views showing various engraved patterns formed on the active material shown in FIG. 1. FIG.

먼저, 도 1을 참조하면, 본 발명의 일 실시예에 따른 이차전지용 전극은 전극 집전체(1) 및 전극 집전체(1)의 양 면 중 적어도 어느 일 면 상에 도포되는 전극 활물질(2)을 포함한다.1, an electrode for a secondary battery according to an embodiment of the present invention includes an electrode current collector 1 and an electrode active material 2 coated on at least one of both surfaces of the electrode current collector 1, .

본 발명의 도면에서는 전극 집전체(1)의 일 면 상에만 전극 활물질(2)이 도포된 경우만을 도시하고 있으나, 본 발명이 이에 한정되는 것은 아니며, 양 면 모두에 전극 활물질이 도포되는 것도 가능함은 물론이다.Although only the case where the electrode active material 2 is coated on one surface of the electrode current collector 1 is shown in the drawing of the present invention, the present invention is not limited thereto, and the electrode active material may be applied to both surfaces. Of course.

상기 전극 집전체(1)로는 전극이 양극인지 음극인지에 따라 서로 다른 금속재질이 적용될 수 있으며, 예를 들어, 전극이 양극인 경우 알루미늄 재질이, 음극인 경우 구리 재질이 사용될 수 있다.As the electrode current collector 1, different metal materials may be used depending on whether the electrode is an anode or a cathode. For example, an aluminum material may be used when the electrode is an anode, and a copper material may be used when the electrode is a cathode.

다만, 이러한 전극 집전체(1)의 재질은 예시적인 것일 뿐이므로 본 발명의 전극 집전체(1)의 재질이 이에 한정되는 것은 아니며, 이차전지 내에서 화학적 변화를 유발하지 않으면서 높은 도전성을 갖는 것이라면 특별히 제한되는 것은 아니다.However, the material of the electrode current collector 1 of the present invention is not limited thereto, and the material of the electrode current collector 1 of the present invention is not limited thereto. The electrode current collector 1 of the present invention may have high conductivity Is not particularly limited.

또한, 전극 집전체(1)는 표면에 미세한 요철을 형성함으로써 전극 활물질(2)과의 접착력을 높일 수도 있으며, 필름, 시트, 호일, 네트, 다공질체, 발포체, 부직포체 등 다양한 형태로 이용될 수 있다.In addition, the electrode current collector 1 may be formed in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, a nonwoven fabric or the like by improving the adhesion with the electrode active material 2 by forming fine irregularities on the surface .

상기 전극 활물질(2)은, 양극 활물질인 경우에는, 예를 들어, LiCoO2, LiMn2O4, LiNiO2, LiMnO2 등의 리튬계 산화물을 주성분으로 하는 화합물이 이용될 수 있고, 음극 활물질인 경우에는, 예를 들어, 탄소 계열 물질, Si, Sn, 틴 옥사이드, 틴 합금 복합체(composite tin alloys), 전이 금속 산화물 등이 이용될 수 있다.In the case of the positive electrode active material, the electrode active material (2) may be a compound containing, as a main component, a lithium-based oxide such as LiCoO 2 , LiMn 2 O 4 , LiNiO 2 , LiMnO 2 , For example, carbon-based materials, Si, Sn, tin oxides, composite tin alloys, transition metal oxides, and the like can be used.

본 발명의 일 실시예에 따른 이차전지용 전극에 적용되는 상기 전극 활물질(2)은, 전해액에 대한 젖음성 향상을 위해, 표면으로부터 일정 깊이로 형성된 소정의 음각 패턴을 구비한다.The electrode active material 2 applied to an electrode for a secondary battery according to an embodiment of the present invention has a predetermined engraved pattern formed at a certain depth from the surface thereof in order to improve the wettability with respect to the electrolyte solution.

상기 음각 패턴은 전극 활물질(2)의 두께 대비 대략 5% 내지 30%의 깊이를 갖는 것이 바람직하다. 상기 음각 패턴의 형성 깊이가 전극 활물질(2)의 두께 대비 5% 미만으로 형성되는 경우에는 음각 패턴의 형성에 따른 전해액의 젖음성 향상 효과를 기대하기 어렵고, 30% 를 초과하는 깊이로 형성되는 경우에는 전극 활물질(2)의 양적인 손실이 지나치게 커지므로 에너지 밀도의 심각한 저하를 가져올 수 있다.It is preferable that the engraved pattern has a depth of about 5% to 30% of the thickness of the electrode active material 2. When the formed depth of the engraved pattern is less than 5% of the thickness of the electrode active material 2, the wettability of the electrolyte is not expected to be improved due to the formation of the engraved pattern. If the formed depth is more than 30% The quantitative loss of the electrode active material 2 becomes excessively large, which may lead to a serious reduction in the energy density.

이러한 음각 패턴은, 정교한 패터닝의 실현을 위해 레이저 패터닝(laser patterning)을 이용하여 형성된다.These engraved patterns are formed using laser patterning for realizing precise patterning.

즉, 상기 음각 패턴은, 이차전지의 특성에 따라 요구되는 전극 집전체를 마련한 후, 그 일면 또는 양 면 상에 전극 활물질을 도포하고 나서 전극 활물질 표면에 대해 레이저 패터닝 작업을 수행함으로써 형성된다.That is, the engraved pattern is formed by providing an electrode current collector required according to the characteristics of the secondary battery, applying an electrode active material on one or both surfaces thereof, and then performing a laser patterning operation on the electrode active material surface.

도 2 내지 도 5를 참조하면, 이러한 음각 패턴의 다양한 형태가 나타나 있다.Referring to FIGS. 2 to 5, various forms of this engraved pattern are shown.

먼저, 도 2를 참조하면, 상기 음각 패턴은, 전극 활물질(2)의 표면 상에서 서로 이격되어 나란하게 형성된 복수의 라인 형태를 갖는 라인형 패턴(P1)에 해당할 수 있다.Referring to FIG. 2, the intaglio pattern may correspond to a line-shaped pattern P1 having a plurality of line shapes spaced apart from each other on the surface of the electrode active material 2.

또한, 도 3을 참조하면, 상기 음각 패턴은, 전극 활물질(2)의 표면 상에서 서로 이격되어 형성된 복수의 스폿(spot) 형태를 갖는 스폿형 패턴(P2)에 해당할 수 있다.3, the intaglio pattern may correspond to a spot-like pattern P2 having a plurality of spot shapes formed on the surface of the electrode active material 2 and spaced apart from each other.

또한, 도 4 및 도 5를 참조하면, 상기 음각 패턴은, 전극 활물질(2)의 표면 상에서 서로 이격되어 형성된 복수의 핀-홀(pin-hole) 형태를 갖는 핀-홀형 패턴(P3)에 해당할 수 있다.4 and 5, the engraved pattern corresponds to a pin-hole pattern P3 having a plurality of pin-hole shapes spaced apart from each other on the surface of the electrode active material 2 can do.

상기 스폿형 패턴(P2)과 핀-홀형 패턴은, 전극 활물질(2)의 표면에서 바라볼 때, 매우 유사한 형태로 보일 수 있는데, 본 발명에 있어서 두 가지 패턴은 음각이 갖는 폭 대비 깊이의 비(ratio)로 구별하는 것으로 한다.The spot-like pattern P2 and the pin-hole-like pattern can be seen in a very similar shape when viewed from the surface of the electrode active material 2. In the present invention, the two patterns have a width to depth ratio (ratio).

즉, 스폿형 패턴(P2)의 경우, 음각이 갖는 폭 대비 깊이의 비가 1.5 미만으로서 비교적 얕은 구덩이 형태를 갖는 경우를 의미하는 것으로 정의하고, 핀-홀형 패턴(P3)의 경우, 음각이 갖는 폭 대비 깊이의 비가 1.5 이상인 경우로서 비교적 좁고 깊은 구덩이 형태를 갖는 경우를 의미하는 것으로 정의하기로 한다.That is, in the case of the spot-like pattern P2, it is defined that the width-to-depth ratio of the engraved pattern is less than 1.5 and the comparatively shallow pit pattern is defined. In the case of the pin-hole pattern P3, And the ratio of the depth of contrast is 1.5 or more, it is defined as a case of having a relatively narrow and deep pit shape.

이러한 음각 패턴(P1~P3) 각각에 대한 현미경 사진이 도 6 내지 도 8에 나타나 있다.Micrographs of each of these engraved patterns P1 to P3 are shown in FIGS. 6 to 8. FIG.

한편, 도 9 및 도 10에는 시간의 경과에 따른 전해액 질량 변화를 나타내는 그래프가 도시되어 있는데, 이를 통해 음각 패턴이 적용된 전극에 대한 우수한 젖음성을 확인할 수 있다.Meanwhile, FIGS. 9 and 10 show graphs showing changes in electrolyte mass with time, and thus, it is possible to confirm excellent wettability of the electrode to which the engraved pattern is applied.

즉, 도 9 및 도 10을 참조하면, 양극 활물질(LiMnO2)에 음각 패턴(라인형 패턴)을 적용한 경우 및 음극 활물질(탄소)에 음각 패턴(라인형 패턴)을 적용한 경우 모두 패턴이 적용이 적용되지 않은 경우와 비교하여 전해액에 대한 젖음성이 크게 향상된 것을 알 수 있다.That is, referring to FIGS. 9 and 10, when an engraved pattern (line pattern) is applied to a cathode active material (LiMnO 2 ) and an engraved pattern (line pattern) is applied to a negative active material It can be seen that the wettability with respect to the electrolytic solution is greatly improved as compared with the case where it is not applied.

또한, 이러한 젖음성의 향상은, 전극 활물질(2)의 표면에 전해액을 떨어뜨린 후 접촉각을 측정하는 방법에 의해서도 알 수 있다.The improvement in wettability can also be obtained by measuring the contact angle after dropping the electrolyte solution on the surface of the electrode active material 2.

즉, 젖음성이 우수할수록 전극 활물질 표면에 떨어진 전해액이 표면에서 잘 퍼지게 되므로 접촉각이 감소하게 되는데, 음각 패턴이 형성되지 않은 일반적인 양극 활물질(LiMnO2)의 경우 122.8도의 접촉각을 나타내는 반면, 라인형 패턴이 형성된 경우(라인 사이의 간격 200㎛; 음각의 깊이 20㎛)에는 33.7도로 접촉각이 크게 감소되는 것을 알 수 있었다.That is, as the wettability is better, the electrolyte dropped on the surface of the electrode active material spreads well on the surface, so that the contact angle is decreased. In the case of a general cathode active material (LiMnO 2 ) having no engraved pattern, the contact angle is 122.8 degrees. It was found that the contact angle was significantly reduced by 33.7 degrees when the formed line was formed (the interval between the lines was 200 mu m; the depth of the engraved line was 20 mu m).

또한, 음극의 경우에도, 음각 패턴이 형성되지 않은 일반적인 음극 활물질(탄소)의 경우 43.8도의 접촉각을 나타내는 반면, 라인형 패턴이 형성된 경우(라인 사이의 간격 200㎛; 음각의 깊이 17㎛)에는 21.7도로 접촉각이 확연히 감소되는 것을 확인할 수 있었다.In the case of the negative electrode, a contact angle of 43.8 degrees is obtained in the case of a general negative electrode active material (carbon) having no engraved pattern, whereas in the case where a line type pattern is formed (200 .mu.m spacing between lines; It was confirmed that the road contact angle was significantly reduced.

상술한 바와 같이, 전극 활물질(2)에 음각 패턴이 형성된 전극은 전해액 젖음성이 향상되므로, 이러한 전극을 이용하여 양극 및 음극을 만들고, 그 사이에 세퍼레이터를 개재한 후, 케이싱 하여 이차전지를 제작하는 경우, 전해액 함침에 소요되는 시간을 단축시킴으로써 제조공정의 효율을 향상시킬 수 있을 뿐만 아니라, 이차전지의 성능 또한 향상시킬 수 있다.As described above, the electrode having the engraved pattern formed on the electrode active material 2 improves the wettability of the electrolyte. Therefore, the positive electrode and the negative electrode are formed by using such an electrode, the separator is interposed therebetween, The efficiency of the manufacturing process can be improved by shortening the time required for impregnating the electrolyte, and the performance of the secondary battery can be improved.

이상에서 본 발명은 비록 한정된 실시예와 도면에 의해 설명되었으나, 본 발명은 이것에 의해 한정되지 않으며 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 본 발명의 기술사상과 아래에 기재될 특허청구범위의 균등범위 내에서 다양한 수정 및 변형이 가능함은 물론이다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

1: 전극 집전체 2: 전극 활물질
P1, P2, P3: 음각 패턴
1: electrode current collector 2: electrode active material
P1, P2, P3: Embossed pattern

Claims (10)

전극 집전체 및 상기 전극 집전체의 적어도 일 면 상에 도포된 전극 활물질을 포함하는 이차전지용 전극에 있어서,
상기 전극 활물질은 표면으로부터 일정 깊이로 형성된 음각 패턴을 구비하는 것을 특징으로 하는 이차전지용 전극.
1. An electrode for a secondary battery comprising an electrode current collector and an electrode active material coated on at least one surface of the electrode current collector,
Wherein the electrode active material has an engraved pattern formed at a predetermined depth from a surface of the electrode active material.
제1항에 있어서,
상기 음각 패턴은,
상기 전극 활물질의 두께 대비 5% 내지 30%의 깊이를 갖는 것을 특징으로 하는 이차전지용 전극.
The method according to claim 1,
Wherein,
Wherein the electrode active material has a depth of 5% to 30% of the thickness of the electrode active material.
제1항에 있어서,
상기 음각 패턴은,
레이저 패터닝에 의해 형성된 것을 특징으로 하는 이차전지용 전극.
The method according to claim 1,
Wherein,
Wherein the electrode is formed by laser patterning.
제1항에 있어서,
상기 음각 패턴은,
서로 이격되어 나란하게 형성된 복수의 라인 형태를 갖는 것을 특징으로 하는 이차전지용 전극.
The method according to claim 1,
Wherein,
Wherein the plurality of line-shaped electrodes have a plurality of line shapes spaced apart from each other.
제1항에 있어서,
상기 음각 패턴은,
서로 이격되어 형성된 복수의 스폿(spot) 형태를 갖는 것을 특징으로 하는 이차전지용 전극.
The method according to claim 1,
Wherein,
Wherein the plurality of electrodes are formed in a plurality of spot shapes spaced apart from each other.
제1항에 있어서,
상기 음각 패턴은,
서로 이격되어 형성된 복수의 핀-홀(pin-hole) 형태를 갖는 것을 특징으로 하는 이차전지용 전극.
The method according to claim 1,
Wherein,
Wherein the second electrode has a plurality of pin-hole shapes spaced apart from each other.
제1항에 있어서,
상기 전극은,
양극 또는 음극인 것을 특징으로 하는 이차전지용 전극.
The method according to claim 1,
The electrode
Wherein the positive electrode is a positive electrode or a negative electrode.
제1항 내지 제7항 중 어느 한 항에 따른 이차전지용 전극이 양극 및 음극 중 적어도 어느 하나로서 적용된 이차전지.A secondary battery in which the electrode for a secondary battery according to any one of claims 1 to 7 is applied as at least one of a positive electrode and a negative electrode. (a) 전극 집전체를 마련하는 단계;
(b) 상기 전극 집전체의 양 면 중 적어도 어느 일 면 상에 전극 활물질을 도포하는 단계; 및
(c) 상기 전극 활물질의 표면에 레이저 패터닝에 의해 일정 깊이로 음각 패턴을 형성하는 단계를 포함하는 이차전지용 전극의 제조방법.
(a) providing an electrode current collector;
(b) applying an electrode active material on at least one surface of the electrode current collector; And
(c) forming an engraved pattern at a predetermined depth on the surface of the electrode active material by laser patterning.
제9항에 있어서,
상기(c)단계는,
상기 음각 패턴의 깊이가 상기 활물질의 두께 대비 5% 내지 30%에 해당하도록 패터닝 하는 단계인 것을 특징으로 하는 이차전지용 전극의 제조방법.
10. The method of claim 9,
The step (c)
Wherein the depth of the engraved pattern is 5% to 30% of the thickness of the active material.
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WO2021060762A1 (en) 2019-09-24 2021-04-01 주식회사 엘지화학 Positive electrode for lithium-sulfur secondary battery having pattern, manufacturing method therefor, and lithium-sulfur secondary battery including same
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US12107276B2 (en) 2019-09-24 2024-10-01 Lg Energy Solution, Ltd. Positive electrode for lithium-sulfur secondary battery having pattern, manufacturing method therefor, and lithium-sulfur secondary battery including same
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