KR20110007785A - Anode having insulating-tape adhered on active-material-non-coated portion, and lithium secondary battery comprising the same - Google Patents

Anode having insulating-tape adhered on active-material-non-coated portion, and lithium secondary battery comprising the same Download PDF

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KR20110007785A
KR20110007785A KR1020090065405A KR20090065405A KR20110007785A KR 20110007785 A KR20110007785 A KR 20110007785A KR 1020090065405 A KR1020090065405 A KR 1020090065405A KR 20090065405 A KR20090065405 A KR 20090065405A KR 20110007785 A KR20110007785 A KR 20110007785A
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negative electrode
lithium secondary
secondary battery
insulating tape
tab
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KR1020090065405A
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Korean (ko)
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이관수
류덕현
구자훈
김지영
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주식회사 엘지화학
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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/595—Tapes
    • 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
    • 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
    • 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
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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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)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

PURPOSE: A negative electrode is provided to lower inside short circuit rate, to suppress the formation of dendrite on an uncoated portion, and to improve safety of a battery through the protection of insulating material. CONSTITUTION: A negative electrode for a lithium secondary battery comprises a negative electrode active material, a current collector, a tap and an insulating tape. At least one uncoated area is formed on the current collector. The tap is included on at least one uncoated area. The insulating tape is adhered at the tap and uncoated portion with the tap.

Description

무지부에 절연테이프를 구비하는 음극, 및 이를 포함하는 리튬 이차 전지{ANODE HAVING INSULATING-TAPE ADHERED ON ACTIVE-MATERIAL-NON-COATED PORTION, AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME}ANODE HAVING INSULATING-TAPE ADHERED ON ACTIVE-MATERIAL-NON-COATED PORTION, AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME}

본 발명은, 절연체 보호를 통해 안전성이 향상된 리튬 이차 전지용 음극에 관한 것이다.The present invention relates to a negative electrode for a lithium secondary battery with improved safety through insulator protection.

일반적으로, 리튬 이차 전지는 하기와 같은 방법으로 제작된다.Generally, a lithium secondary battery is produced by the following method.

우선, 양극 도전 호일과 음극 도전 호일에 각각 양극 활물질 및 음극 활물질을 소정의 두께로 코팅하여 형성된 전극을 제작한다. First, an electrode formed by coating a positive electrode active material and a negative electrode active material to a predetermined thickness on a positive electrode conductive foil and a negative electrode conductive foil, respectively, is produced.

상기 전극 사이에 분리막을 개재한 후, 젤리 롤(jelly roll) 내지는 원통 형태로 다수회 권취하여 전극조립체를 제작한다. After the separator is interposed between the electrodes, the electrode assembly is manufactured by winding a plurality of times in a jelly roll or a cylindrical shape.

상기 전극조립체를 원통형 또는 각형 캔, 파우치 등에 수납하고 이를 밀봉 처리하면 최종적으로 리튬 이차 전지가 완성된다. When the electrode assembly is accommodated in a cylindrical or rectangular can, a pouch, or the like and sealed, the lithium secondary battery is finally completed.

특히, 상기 도전 호일에는, 전지 외부로부터 충전 전원이 인가되거나 또는 전지 외부로 방전 전원이 인가될 수 있도록, 도전용 탭이 용접되어 외부로 일정 길이 연장되어 있다. 즉, 양극 도전 호일에는 양극 도전 탭이, 음극 도전 호일에는 음극 도전탭이 용접되어 있다. In particular, the conductive foil has a conductive tab welded and extended to a predetermined length so that charging power can be applied from the outside of the battery or discharge power can be applied to the outside of the battery. That is, a positive electrode conductive tab is welded to the positive electrode conductive foil, and a negative electrode conductive tab is welded to the negative electrode conductive foil.

또한, 이러한 양극 도전 탭 및 음극 도전 탭의 표면에는 분리막의 파손을 방지하고, 각 도전 호일과의 직접적인 쇼트를 예방할 수 있도록 일정 두께의 절연 테이프가 부착되어 있다. In addition, an insulating tape having a predetermined thickness is attached to the surfaces of the positive electrode conductive tab and the negative electrode conductive tab so as to prevent breakage of the separator and prevent direct short with each conductive foil.

종래의 기술은, 쇼트 방지를 목적으로 탭에 구비되는 절연 테이프를 가급적 최소한도로 사용하였다. 즉, 종래의 전지의 경우, 절연테이프는 탭만을 간신히 덮을 수 있을 정도만으로 구비되었다. 이는 전지의 두께 및 활물질의 양을 고려한 것인데, 자세히 설명하면 아래와 같은 이유에서이다. The prior art used the insulating tape provided in a tab to the minimum for the purpose of a short prevention. That is, in the case of the conventional battery, the insulating tape is provided only to cover the tab only. This is considering the thickness of the battery and the amount of the active material, which will be explained in detail for the following reasons.

통상적으로 도전 호일은 대략 10㎛ 내외, 활물질은 대략 120㎛ 내외, 도전 탭은 대략 100㎛ 내외, 절연 테이프는 대략 40㎛ 정도의 두께를 가지는데, 상기 탭에 절연테이프가 구비되면 절연 테이프의 두께만큼 부피가 늘어나가게 된다. 즉, 늘어난 부피만큼 전지가 커질 수 있고, 같은 크기의 케이스라면 그만큼의 활물질을 적게 함유할 소지가 있는 것이다.Typically, the conductive foil has a thickness of about 10 μm, the active material is about 120 μm, the conductive tab is about 100 μm, and the insulating tape has a thickness of about 40 μm. As the volume increases. In other words, the battery can be enlarged by an increased volume, and if the case is the same size, it may contain less active material.

따라서, 종래의 전지는 상기 탭에 구비되는 절연테이프는 탭만을 감쌓는 정도의 최소한으로 구비되는 방식을 채택하였던 것이다.Therefore, the conventional battery adopts a method in which the insulating tape provided on the tab is provided to a minimum such that only the tab is wrapped.

그런데, 종래의 전지는 아래와 같은 이유로, 안전성에 문제점이 있을 수 있다.However, the conventional battery may have a problem in safety due to the following reasons.

통상적으로, 전극 호일(집전체)에 전극 활물질을 도포하는 과정은, 활물질이 일정한 크기와 모양의 노즐을 통해 토출됨과 동시에, 상기 노즐이 도포를 원하는 부위를 따라 이동하면서 일정한 두께로 전극 활물질을 도포하는 방식을 취한다. In general, the process of applying the electrode active material to the electrode foil (current collector), while the active material is discharged through a nozzle of a certain size and shape, the nozzle active material is applied to a constant thickness while moving along the desired area for application Take the way.

이 경우 활물질은 원하는 부위에만 도포되어지는 것이 바람직하겠으나, 실제적인 공정상으로는 그러하지 아니하다. 즉, 실제적인 공정상에서는 노즐에서 토출된 활물질의 일부는, 마이크로 스케일로 도포를 원하지 않는 부위에도 미세하게 날아가 증착하는 현상이 일어나는 것이다. In this case, it is preferable that the active material be applied only to a desired portion, but this is not the case in the actual process. That is, in a practical process, a part of the active material discharged from the nozzle is finely blown and deposited even on a portion where it is not desired to apply at a micro scale.

이렇듯 원하지 않는 부위에 마이크로 스케일로 활물질이 도포되는 현상은 거의 모든 활물질 도포공정에서 일어나는 것으로 추정되며, 이와 같이 증착된 활물질의 미소단위를 아일랜드(island)라 부른다(이러한 아일랜드는 최근 전지의 안전성 향상을 위한 연구과정에 새롭게 알려진 것으로, 종래의 기술은 이러한 것에 대해 인식조차 못하고 있는 실정이다). It is estimated that the application of the active material at micro scales to unwanted areas occurs in almost all active material application processes, and the microunits of the active material deposited in this way are called islands. Newly known in the course of research, the conventional technology is not even aware of this).

그런데, 원치않는 무지부에 형성된 아일랜드는 전지의 안전성에 큰 악영향을 미칠 수 있다. 특히, 양극에 형성된 아일랜드가 분리막을 사이에 두고 음극탭이 구비한 무지부와 대면되게 되면, 충·방전 과정에서 양극에 형성된 아일랜드로 인해 음극에서 덴드라이트(dendrite)가 자라날 수 있게 된다. 이렇게 형성된 덴드라이트는 종국적으로는 분리막으로 파괴할 수도 있고, 단락을 유발시킬 수도 있으므로, 전지의 안전성을 크게 해치게 된다. By the way, the island formed in the undesired uncoated region can have a great adverse effect on the safety of the battery. In particular, when the island formed on the anode faces the uncoated portion of the cathode tab with the separator interposed therebetween, a dendrite may grow on the cathode due to the island formed on the anode during the charging and discharging process. The dendrites thus formed may eventually be destroyed by a separator or may cause a short circuit, thereby greatly deteriorating the safety of the battery.

도 1에서 본 발명이 해결하고자 하는 과제를 도시적으로 나타내었다.1 illustrates the problem to be solved by the present invention.

따라서, 본 발명은 상기한 종래기술의 문제점을 해결하고자, 음극 탭이 구비 된 무지부를 절연테이프로 절연시켜 안정성이 높은 전지를 제공하고자 한다.Accordingly, the present invention is to provide a battery with high stability by insulating the non-coating portion provided with a negative electrode tab with an insulating tape to solve the problems of the prior art.

본 발명은 상기한 종래기술의 문제점을 해결하기 위해 안출된 것으로서,The present invention has been made to solve the above problems of the prior art,

음극활물질, 집전체, 탭, 및 절연테이프를 포함하고, 상기 집전체 상에는 무지부가 적어도 하나 이상 형성되어 있는 것이며, 상기 무지부의 적어도 하나 이상에 상기 탭이 구비되는 리튬이차전지용 음극에 있어서, In the negative electrode active material, a current collector, a tab, and an insulating tape, at least one non-coating portion is formed on the current collector, at least one or more of the non-coating portion in the negative electrode for a lithium secondary battery,

상기 절연테이프가 상기 탭 및 상기 탭이 구비된 무지부 일면에 접착되어 있는 것을 특징으로 하는 리튬이차전지용 음극을 제공한다.The insulating tape is provided with a negative electrode for a lithium secondary battery, characterized in that the tab and the adhesive is attached to one side of the plain portion provided with the tab.

또한, 본 발명에 있어서, 상기 절연테이프는 상기 탭이 구비된 무지부 일면의 실질적인 전체(substantially total)를 덮는 것임을 특징으로 하는 리튬이차전지용 음극을 제공한다.In addition, in the present invention, the insulating tape provides a negative electrode for a lithium secondary battery, characterized in that to cover a substantially (substantially total) of one side of the plain portion provided with the tab.

또한, 본 발명에 있어서, 상기 절연테이프는, 두께에 있어서, 상기 음극활물질과 실질적으로 단차없이 접착되어 있는 것임을 특징으로 하는 리튬이차전지용 음극을 제공한다.In addition, in the present invention, the insulating tape is, in thickness, provides a negative electrode for a lithium secondary battery, characterized in that the adhesion to the negative electrode active material substantially without step.

또한, 본 발명에 있어서, 상기 절연테이프의 두께는 15 ~ 70 ㎛ 범위 이내인 것임을 특징으로 하는 리튬이차전지용 음극을 제공한다.In addition, in the present invention, the thickness of the insulating tape provides a negative electrode for a lithium secondary battery, characterized in that within the range of 15 ~ 70 ㎛.

또한, 본 발명에 있어서, 상기 절연테이프는 폴리에틸렌테레프탈레이트(Polyethylene terephthalate), 또는 폴리이미드(Polyimide) 소재의 고분자인 것임을 특징으로 하는 리튬이차전지용 음극을 제공한다.In addition, in the present invention, the insulating tape is a polyethylene terephthalate (Polyethylene terephthalate), or a polyimide (Polyimide) provides a negative electrode for a lithium secondary battery, characterized in that the polymer.

또한, 본 발명에 있어서, 상기 집전체는 구리호일인 것임을 특징으로 하는 리튬이차전지용 음극을 제공한다.In addition, in the present invention, the current collector provides a negative electrode for a lithium secondary battery, characterized in that the copper foil.

또한, 본 발명의 상기 음극을 포함하는 것을 특징으로 하는 리튬이차전지를 제공한다.In addition, it provides a lithium secondary battery comprising the negative electrode of the present invention.

본 발명은, 음극 탭이 구비된 무지부에 덴드라이트 형성을 억제하고, 내부 단락 발생율을 저하시키므로, 종국적으로 전지의 안전성을 향상시키는 효과가 있다.The present invention suppresses the formation of dendrite in the non-coated portion provided with the negative electrode tab and lowers the occurrence rate of internal short circuit, and thus has the effect of ultimately improving the safety of the battery.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

본 발명은, The present invention,

음극활물질, 집전체, 탭, 및 절연테이프를 포함하고, 상기 집전체 상에는 무지부가 적어도 하나 이상 형성되어 있는 것이며, 상기 무지부의 적어도 하나 이상에 상기 탭이 구비되는 리튬이차전지용 음극에 있어서, 상기 절연테이프가 상기 탭 및 상기 탭이 구비된 무지부 일면에 접착되어 있는 것을 특징으로 한다.A negative electrode active material, a current collector, a tab, and an insulating tape, wherein at least one non-coated portion is formed on the current collector, and at least one of the non-coated portions is provided with the tab. It is characterized in that the tape is bonded to one side of the tab and the plain portion provided with the tab.

상기 무지부는 활물질이 도포되지 아니한 집전체 상의 일부분를 말하는 것으 로, 당해 기술분야에 널리 사용되는 용어이다.The uncoated portion refers to a portion of the current collector to which the active material is not applied, and is a term widely used in the art.

상기 절연테이프는, 상기 탭이 구비된 무지부 일면의 실질적인 전체(substantially total)를 덮는 것이 바람직하다. 무지부 일면의 '실질적인 전체'를 덮는다는 의미는 양극에 형성된 아일랜드에 의해서 음극에서 덴드라이트가 자라나지 않을 충분한 전기적 절연상태를 만들 정도로 무지부를 절연피복하는 것을 말한다.The insulating tape preferably covers a substantially total of one side of the non-coated portion provided with the tab. Covering the 'substantial entirety' of one side of the uncoated area means that the uncoated area is insulated enough to create a sufficient electrical insulation state where the dendrites do not grow on the cathode by the island formed on the anode.

상기 절연테이프는, 두께에 있어서, 상기 음극활물질과 실질적으로 단차없이 접착되어 있는 것이 바람직하다. 활물질 도포 부위와 무지부간의 단차가 형성된 부분은, 집전체가 압력을 받는 경우에, 집전체의 손상을 가져올 수 있는 부분이 될 수 있다. 즉, 원통형 전지를 제조하기 위해 전극과 분리막을 권취하는 경우, 무지부와 활물질 도포 부위간의 집전체에는, 특히 다른 곳보다, 많은 압력을 받을 수 있게 되고, 이 부분에 전기적 단선이 일어날 우려가 있는 것이다. 따라서, 절연테이프를 상기 음극활물질과 실질적으로 단차없이 형성하여 집전체가 고르게 압력을 받도록 하는 것이 바람직하다. '실질적으로 단차없이'의 의미는 상기 설명한 것과 같이 압집전체의 압력을 고르게 하기 위한 정도로 충분히 단차가 작음을 의미하는 것이다.It is preferable that the said insulating tape is adhere | attached with respect to the said negative electrode active material substantially without difference in thickness. The part where the step | step between the active material application | coating site | part and the uncoated part was formed may be a part which may cause damage to an electrical power collector, when an electrical power collector receives a pressure. That is, when the electrode and the separator are wound in order to manufacture a cylindrical battery, the current collector between the uncoated portion and the active material coating portion can be subjected to more pressure than other places, and there is a possibility that electrical breakage may occur in this portion. will be. Therefore, it is preferable to form an insulating tape with the negative electrode active material substantially without step so that the current collector is evenly pressured. The term "substantially without step" means that the step is small enough to even out the pressure of the collector as described above.

특히, 상기 절연테이프의 두께는 15 ~ 70 ㎛ 범위 이내인 것이 바람직하다. 15 ㎛ 이하의 두께에서는 테이프를 붙이는 공정에 있어서, 붙착시 어려움이 발생하 여 생산성이 저하될 우려가 있고, 70 ㎛ 초과하는 두께에서는 불필요하게 전지의 두께가 증가하고, 심한 단차를 형성하게 되는 문제점이 있을 수 있다. In particular, the thickness of the insulating tape is preferably within the range of 15 ~ 70 ㎛. If the thickness is 15 μm or less, the tape attaching process may have difficulty in sticking, resulting in a decrease in productivity. If the thickness exceeds 70 μm, the thickness of the battery is unnecessarily increased and a serious step is formed. There may be.

상기 절연테이프는 전기적 절연성이 높고 열안전성이 있는 물질로 된 것이라면 특별히 제한되지 않는다. 이러한 물질로 폴리에틸렌테레프탈레이트(Polyethylene terephthalate), 또는 폴리이미드(Polyimide) 소재의 고분자를 예시할 수 있다.The insulating tape is not particularly limited as long as it is made of a material having high electrical insulation and heat safety. Such a material may be exemplified by polyethylene terephthalate or a polymer made of polyimide.

상기 집전체는 음극에 사용되는 통상적인 집전체를 제한없이 사용할 수 있다. 통상적으로 음극 집전체는 구리호일을 사용하여 제작된다.The current collector may use any conventional current collector used for the negative electrode without limitation. Typically, the negative electrode current collector is manufactured using copper foil.

또한, 본 발명은, 상기 음극을 포함하는 것을 특징으로 하는 리튬이차전지에 관한 것이다. 본 발명의 리튬이차전지는 본 발명의 음극을 포함하여 제작된다. 상기 리튬이차전지를 제조하는 방법은 종래의 것을 제한없이 사용할 수 있다.The present invention also relates to a lithium secondary battery comprising the negative electrode. The lithium secondary battery of the present invention is produced including the negative electrode of the present invention. The method for manufacturing the lithium secondary battery may be used without limitation.

이하 실시예를 들어 본 발명을 더 상세히 설명한다. 본 발명의 실시예는 발명의 상세한 설명을 위한 것일 뿐, 이에 의해 권리범위를 제한하려는 것은 아니다.The present invention will be described in more detail with reference to the following examples. The embodiments of the present invention are only for the detailed description of the present invention, and are not intended to limit the scope thereof.

비교예Comparative example - [아일랜드가 형성된 전지의 제작] [Manufacture of Batteries with Island Formation]

일반적으로 생산되는 원통형 리튬 이차 전지의 구조를 갖는 전지를 제조한 후, 젤리롤형 전극조립체를 분해하였다. After manufacturing a battery having a structure of a generally produced cylindrical lithium secondary battery, the jelly roll type electrode assembly was decomposed.

젤리롤형 전극조립체의 양극 아일랜드(island)발생 가능지역(도 1의 위험지역에 대응되는 양극 무지부에 해당함)에 약 0.5 ~ 2㎜ 정도의 아일랜드를 임의로 형성하기 위하여, 양극 활물질을 양극 무지부에 미소 도포한 후 다시 젤리롤형 전극조립체를 권취하였다. In order to form an island of about 0.5 to 2 mm in a cathode island-prone region (corresponding to a hazardous region of FIG. 1) of a jelly roll-type electrode assembly, the cathode active material may be After the microscopic coating, the jellyroll electrode assembly was wound up again.

권취된 전극조립체를 전지케이스에 넣어 밀봉한 후 활성화 공정을 진행하였다.The wound electrode assembly was sealed in a battery case and the activation process was performed.

상기 아일랜드 형성과정은 본 발명의 유효성을 명확히 증명하기 위해 임의로 형성한 것이지만, 실제 전지 제조 공정 중 아일랜드 발생가능성이 매우 높다는 사실을 이해해야 한다.Although the island forming process is arbitrarily formed to clearly demonstrate the effectiveness of the present invention, it should be understood that the island occurrence rate is very high in the actual battery manufacturing process.

실시예Example

상기 비교예와 달리 절연테이프를 아일랜드(island)발생 가능지역(도 1의 위험지역에 대응되는 양극 무지부에 해당함)까지 연장·부착하였다. Unlike the comparative example, the insulating tape was extended and attached to an island occurrence possible region (corresponding to an anode non-coating portion corresponding to the dangerous region of FIG. 1).

나머지 제작과정에 있어서, 상기 비교예와 모두 동일한 과정을 수행하여 최종적으로 전지를 제작하였다.In the rest of the manufacturing process, all the same process as in the comparative example was carried out to finally produce a battery.

[저전압 [Low voltage 불량율Defective rate 및 내부 미세 단락 실험] And internal microcircuit experiments]

상기 실시예와 비교예에서 발생되는 저전압 불량율 및 내부 미세 단락 발생위치를 측정하였다. 실험의 신뢰도를 높히기 위해, 상기 실시예 및 비교예의 전지는 각각 200개씩 제작되었다.The low voltage failure rate and the internal fine short circuit occurrence position generated in the above Examples and Comparative Examples were measured. In order to increase the reliability of the experiment, the batteries of Examples and Comparative Examples were each produced 200.

결과는 하기 표 1과 같았다.The results were as shown in Table 1 below.

저전압 불량율
(총 샘플수 : 200개)Low Voltage Defective Rate
(Total number of samples: 200) 내부 미세 단락 발생 위치Internal fine short circuit location 실시예Example 3.5% (7 / 200 ea)3.5% (7/200 ea) 7개 모두 임의로 형성된 양극 아일랜드 위치에서 단락이 발생함.All 7 shorts at the randomly formed anode island position. 비교예Comparative example 0.5% ( 1/ 200 ea)0.5% (1/200 ea) 내부 단락 흔적 확인 불가No internal short circuit traces

실험결과, 상기 표 1에 나타난 바와 같이, 탭이 구비되는 무지부를 절연테이프로 처리함으로써, 저전압 불량율 및 내부 단락 발생 빈도를 줄일 수 있음을 확인할 수 있었다.As a result of the experiment, as shown in Table 1, it was confirmed that by treating the uncoated portion provided with the tab with the insulating tape, it is possible to reduce the low voltage failure rate and the frequency of the internal short circuit.

도 1은 본 발명이 해결하고자 하는 과제를 나타낸 모식도.1 is a schematic diagram showing the problem to be solved by the present invention.

Claims (7)

음극활물질, 집전체, 탭, 및 절연테이프를 포함하고, 상기 집전체 상에는 무지부가 적어도 하나 이상 형성되어 있는 것이며, 상기 무지부의 적어도 하나 이상에 상기 탭이 구비되는 리튬이차전지용 음극에 있어서, In the negative electrode active material, a current collector, a tab, and an insulating tape, at least one non-coating portion is formed on the current collector, at least one or more of the non-coating portion in the negative electrode for a lithium secondary battery, 상기 절연테이프가 상기 탭 및 상기 탭이 구비된 무지부 일면에 접착되어 있는 것을 특징으로 하는 리튬이차전지용 음극.The negative electrode for a lithium secondary battery, wherein the insulating tape is adhered to one side of the tab and the plain portion provided with the tab. 제 1 항에 있어서, 상기 절연테이프는 상기 탭이 구비된 무지부 일면의 실질적인 전체(substantially total)를 덮는 것임을 특징으로 하는 리튬이차전지용 음극.The negative electrode for a lithium secondary battery of claim 1, wherein the insulating tape covers a substantially total of one surface of the uncoated portion provided with the tab. 제 1 항에 있어서, 상기 절연테이프는, 두께에 있어서, 상기 음극활물질과 실질적으로 단차없이 접착되어 있는 것임을 특징으로 하는 리튬이차전지용 음극.The negative electrode for a lithium secondary battery according to claim 1, wherein the insulating tape is adhered to the negative electrode active material substantially without step in thickness. 제 1 항에 있어서, 상기 절연테이프의 두께는 15 ~ 70 ㎛ 범위 이내인 것임을 특징으로 하는 리튬이차전지용 음극.According to claim 1, wherein the thickness of the insulating tape is a negative electrode for a lithium secondary battery, characterized in that within the range of 15 ~ 70 ㎛. 제 1 항에 있어서, 상기 절연테이프는 폴리에틸렌테레프탈레이트(Polyethylene terephthalate), 또는 폴리이미드(Polyimide) 소재의 고분자인 것임을 특징으로 하는 리튬이차전지용 음극.The negative electrode of claim 1, wherein the insulating tape is a polymer made of polyethylene terephthalate or polyimide. 제 1 항에 있어서, 상기 집전체는 구리호일인 것임을 특징으로 하는 리튬이차전지용 음극.According to claim 1, wherein the current collector is a negative electrode for a lithium secondary battery, characterized in that the copper foil. 제 1 항 내지 제 6 항 어느 한 청구항의 음극을 포함하는 것을 특징으로 하는 리튬이차전지.A lithium secondary battery comprising the negative electrode of any one of claims 1 to 6.
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KR20130020550A (en) * 2011-08-18 2013-02-27 삼성에스디아이 주식회사 Secondary battery
KR20150043016A (en) * 2013-10-14 2015-04-22 주식회사 엘지화학 Electrode assembly and secondary battery comprising the same
US9490469B2 (en) 2013-11-20 2016-11-08 Samsung Sdi Co., Ltd. Rechargeable battery having fuse
US9819046B2 (en) 2014-10-31 2017-11-14 Samsung Sdi Co., Ltd. Rechargeable battery
WO2018048109A1 (en) * 2016-09-09 2018-03-15 삼성에스디아이 주식회사 Secondary battery
WO2019083156A1 (en) * 2017-10-27 2019-05-02 주식회사 엘지화학 Lithium metal anode structure manufacturing method and lithium metal anode structure
US11228029B2 (en) 2017-10-27 2022-01-18 Lg Chem, Ltd. Method for producing lithium metal negative electrode structure and lithium metal negative electrode structure

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120095039A (en) * 2011-02-18 2012-08-28 주식회사 엘지화학 Electrode assembly for secondary battery and secondary battery comprising the same
KR20130020550A (en) * 2011-08-18 2013-02-27 삼성에스디아이 주식회사 Secondary battery
US9806370B2 (en) 2011-08-18 2017-10-31 Samsung Sdi Co., Ltd. Secondary battery having a planarizing member
KR20150043016A (en) * 2013-10-14 2015-04-22 주식회사 엘지화학 Electrode assembly and secondary battery comprising the same
US9490469B2 (en) 2013-11-20 2016-11-08 Samsung Sdi Co., Ltd. Rechargeable battery having fuse
US9819046B2 (en) 2014-10-31 2017-11-14 Samsung Sdi Co., Ltd. Rechargeable battery
WO2018048109A1 (en) * 2016-09-09 2018-03-15 삼성에스디아이 주식회사 Secondary battery
WO2019083156A1 (en) * 2017-10-27 2019-05-02 주식회사 엘지화학 Lithium metal anode structure manufacturing method and lithium metal anode structure
US11228029B2 (en) 2017-10-27 2022-01-18 Lg Chem, Ltd. Method for producing lithium metal negative electrode structure and lithium metal negative electrode structure

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