KR100696452B1 - Separator for Li-ion secondary battery and Li-ion secondary battery utilizing the same - Google Patents

Separator for Li-ion secondary battery and Li-ion secondary battery utilizing the same Download PDF

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KR100696452B1
KR100696452B1 KR1019990052635A KR19990052635A KR100696452B1 KR 100696452 B1 KR100696452 B1 KR 100696452B1 KR 1019990052635 A KR1019990052635 A KR 1019990052635A KR 19990052635 A KR19990052635 A KR 19990052635A KR 100696452 B1 KR100696452 B1 KR 100696452B1
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separator
ion secondary
secondary battery
lithium ion
pores
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KR20010048097A (en
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김승기
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삼성에스디아이 주식회사
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    • 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
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • 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
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection 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
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection 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
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • 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
    • H01M50/417—Polyolefins
    • 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
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with 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
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    • 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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Abstract

목적 : 리튬이온 이차전지의 안전성을 향상시킬 수 있는 세퍼레이터 및 이를 이용한 리튬이온 이차전지를 제공한다.PURPOSE: To provide a separator capable of improving the safety of a lithium ion secondary battery and a lithium ion secondary battery using the same.

구성 : 본 발명의 리튬이온 이차전지용 세퍼레이터는 기공의 분포를 사선 형태로 구성한다. 또한 리튬이온 이차전지는 기공의 분포를 사선의 형태로 구성한 세퍼레이터 및 정극과 부극을 포함한다. 상기 기공의 방향은 머신 디렉숀 기준으로 30∼40°이다. Structure: The separator for lithium ion secondary batteries of this invention comprises the distribution of pores in diagonal form. In addition, the lithium ion secondary battery includes a separator having a pore distribution in the form of diagonal lines, a positive electrode and a negative electrode. The direction of the pores is 30 to 40 degrees on the basis of the machine direction.

효과 : 본 발명의 세퍼레이터는 그 기공이 사선 모양으로 분포되도록 하여 횡단 강도를 보완할 수 있으며, 또한 세퍼레이터의 찢어짐으로 인한 급격한 내부 쇼트에 의하여 발생하는 전지의 발화, 파열 및 폭발을 방지할 수 있어 리튬이온 이차전지의 안전성을 향상시킬 수 있다.Effect: The separator of the present invention can compensate for the transverse strength by allowing the pores to be distributed in an oblique shape, and can also prevent the ignition, rupture and explosion of the battery caused by the rapid internal short circuit caused by the tearing of the separator. The safety of the ion secondary battery can be improved.

세퍼레이터, 기공, 사선, 머신 디렉숀Separator, Pore, Diagonal, Machine Direction

Description

리튬이온 이차전지용 세퍼레이터 및 이를 이용한 리튬이온 이차전지{Separator for Li-ion secondary battery and Li-ion secondary battery utilizing the same} Separator for Li-ion secondary battery and Li-ion secondary battery utilizing the same}             

도 1은 전지의 전극 구조를 나타내는 사시도이며,1 is a perspective view showing an electrode structure of a battery;

도 2는 종래의 세퍼레이터의 기공배열을 2 만배 확대한 모양을 나타내는 사진이며,2 is a photograph showing a state in which a pore array of a conventional separator is enlarged 20,000 times,

도 3은 종래의 세퍼레이터의 압축실험에 의하여 찢어짐을 보이는 사진이며,3 is a photograph showing tearing by a compression test of a conventional separator,

도 4는 본 발명의 세퍼레이터의 기공 분포를 2 만배 확대한 모양을 나타내는 사진이다.4 is a photograph showing a state in which the pore distribution of the separator of the present invention is enlarged by 20,000 times.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

10 : 전극 12 : 양극 극판10 electrode 12 anode plate

14 : 음극 기판 16 : 세퍼레이터14 cathode substrate 16 separator

18 : 양극 Al 탭 20 : 음극 Ni 탭18: anode Al tab 20: cathode Ni tab

본 발명은 리튬이온 이차전지에 관한 것이며, 보다 상세하게는 리튬이온 이차전지의 안전성을 향상시킬 수 있는 세퍼레이터 및 이를 이용한 리튬이온 이차전지에 관한 것이다.The present invention relates to a lithium ion secondary battery, and more particularly, to a separator capable of improving the safety of a lithium ion secondary battery and a lithium ion secondary battery using the same.

최근, 리튬이온 이차전지가 주목되고 있다. 리튬이온 이차전지는 충방전이 가능하고, 동작시간을 연장시키거나 제품을 경량화 할 수 있어 고전압, 고전지 용량이 가능하여 휴대전화, 휴대용 퍼스날컴퓨터 등의 전원으로 폭 넓게 사용되고 있다.In recent years, lithium ion secondary batteries have attracted attention. Lithium-ion secondary batteries are capable of charging and discharging, prolonging their operating time or reducing the weight of their products, enabling high voltage and high-capacity capacity, and are widely used as power sources for mobile phones and portable personal computers.

이와 같은 리튬이온 이차전지는, 리튬-천이금속 산화물을 정극으로 사용하고, 리튬을 흡장 및 방출할 수 있는 탄소질 재료를 부극으로 사용하며, 그 사이에 유기용매에 리튬염을 가한 액체 전해질을 주입하여, 상기 정극과 부극간의 리튬이온의 이동에 의한 기전력을 이용하여 전지의 충·방전이 이루어진다.Such a lithium ion secondary battery uses a lithium-transition metal oxide as a positive electrode, uses a carbonaceous material capable of occluding and releasing lithium as a negative electrode, and injects a liquid electrolyte added lithium salt to an organic solvent therebetween. Thus, the battery is charged and discharged by using electromotive force due to the movement of lithium ions between the positive electrode and the negative electrode.

도 1은 리튬이온 이차전지의 전극의 일반적인 구조를 도시한 도면이다.1 is a diagram illustrating a general structure of an electrode of a lithium ion secondary battery.

리튬이온 이자전지의 전극군(10)은 시트상의 정극(12), 부극(14) 및 세퍼레이터(16)로 나누어지며, 세퍼레이터(16)를 사이에 두고 정극(12)과 부극(14)이 함께 권취되어 젤리 롤을 형성한다.The electrode group 10 of the lithium ion rechargeable battery is divided into a sheet-shaped positive electrode 12, a negative electrode 14, and a separator 16, and the positive electrode 12 and the negative electrode 14 together with the separator 16 interposed therebetween. It is wound up to form a jelly roll.

여기서, 세퍼레이터는 정극과 부극을 분리하여 단락을 방지하고, 전지 반응에 필요한 전해액을 흡수하여 높은 이온전도도를 유지하는 기능을 한다. 특히 리튬이온 전지의 경우에는 급격한 온도 상승이나 외부로부터의 과도한 충격 등의 극한 환경에서 안정성을 확보할 수 있는 부가적인 기능이 요구된다.Here, the separator functions to separate the positive electrode and the negative electrode to prevent a short circuit, to absorb the electrolyte solution required for the battery reaction, and to maintain high ion conductivity. In particular, in the case of a lithium ion battery, an additional function for securing stability in an extreme environment such as rapid temperature rise or excessive shock from the outside is required.

또한, 리튬이온 이차전지에 있어서는, 전해액으로 유기전해액을 사용하기 때문에 안전성을 확보하기 위하여는 다른 비수계(非水系) 소형 이차전지와는 다른 세퍼레이터 특성을 필요로 한다.In addition, in the lithium ion secondary battery, since the organic electrolyte is used as the electrolyte, in order to ensure safety, separator characteristics different from other non-aqueous small secondary batteries are required.

따라서, 화학 안전성, 두께, 기계적 특성, 전류차단 특성 등을 고려하여 전지의 설계 시스템에 맞는 최적의 세퍼레이터를 적용하는바, 그 일 예로 전지 내부 온도가 올라갈 경우 기공 크기가 작아지거나 막혀 저항을 급속도록 증가시킴으로써 반응을 억제하는 셔트-다운(shut-down) 기능을 갖는 세퍼레이터가 있다.Therefore, in consideration of chemical safety, thickness, mechanical characteristics, and current blocking characteristics, the optimum separator suitable for the design system of the battery is applied. There is a separator with a shut-down function that suppresses the reaction by increasing.

이러한 세퍼레이터의 일반적인 제조방법은 크게 건식법과 습식법으로 나누어진다. 건식법은 일축연신에 의하여 기공을 형성하며, 습식법은 유기입자가 포함된 상태로 이축연신한 후, 이 입자를 녹임으로써 기공이 형성된다.The general manufacturing method of such a separator is largely divided into a dry method and a wet method. In the dry method, pores are formed by uniaxial stretching, and the wet method is biaxially stretched in a state in which organic particles are contained, and then pores are formed by melting the particles.

도 2와 같이 건식법에 의한 세퍼레이터(16)는 습식법에 비하여 횡단 방향(transverse direction)의 강도가 현저히 떨어지는데, 이는 일축연신으로 인한 기공(16a)의 배열형태와 관계가 있다.As shown in FIG. 2, the separator 16 by the dry method has a significantly lower strength in the transverse direction than the wet method, which is related to the arrangement of the pores 16a due to uniaxial stretching.

건식법으로 제조된 세퍼레이터(16)를 리튬이온 전지에 적용할 경우에는, 안전성 평가 항목중 기계적 강도를 요하는 압축 실험이 있는데, 이때 상기 세퍼레이터는 약한 충격에 의해서도 도 3에 도시한 바와 같이 횡단 방향으로 찢어지는 손상부(16b)를 갖게 되므로, 전지의 내부 쇼트를 발생시킬 수 있으며 발화, 파열 및 폭발의 위험성까지 수반하므로 리튬이온 이차전지의 안전성에 치명적인 영향을 주는 문제점이 있다.When the separator 16 manufactured by the dry method is applied to a lithium ion battery, there is a compression test that requires mechanical strength among safety evaluation items, and the separator has a weak impact in the transverse direction as shown in FIG. 3. Since the tearing part 16b is torn, it may cause an internal short circuit of the battery and may involve a risk of ignition, rupture and explosion, thereby causing a fatal effect on the safety of the lithium ion secondary battery.

본 발명은 상기와 같은 문제점들을 해결하기 위하여 안출된 것으로, 그 목적은 외부 충격에 대한 강도를 보강하므로 리튬이온 이차전지의 안전성을 향상시킬 수 있는 세퍼레이터 및 이를 이용한 리튬이온 이차전지를 제공하는 것이다.The present invention has been made to solve the above problems, the object of the present invention is to provide a separator and a lithium ion secondary battery using the same that can improve the safety of the lithium ion secondary battery by reinforcing the strength against external impact.

상기의 목적을 실현하기 위하여, 본 발명의 리튬이온 이차전지용 세퍼레이터는 기공의 분포를 사선 형태로 구성한다.In order to realize the above object, the separator for lithium ion secondary batteries of the present invention comprises a distribution of pores in an oblique form.

또한 본 발명은 상기 기공의 분포를 사선의 형태로 구성한 세퍼레이터 및 정극과 부극을 포함하는 리튬이온 이차전지를 제공한다.In another aspect, the present invention provides a separator comprising a distribution of the pores in the form of an oblique line, and a lithium ion secondary battery comprising a positive electrode and a negative electrode.

여기서, 상기 기공의 방향은 머신 디렉숀(machine direction) 기준으로 30∼40°이다. Here, the direction of the pores is 30 to 40 degrees on the basis of the machine direction (machine direction).

상기 세퍼레이터는 폴리올레핀계의 단일 또는 복합 재질을 사용하며, 전기 정극 활물질로는 LiCoO2, LiMnO2. LiNiO2 중에서 선택한 1종의 리튬금속산화물을 사용하며, 부극 활물질로는 탄소를 함유하는 탄소질재료를 사용한다.The separator uses a polyolefin-based single or composite material, and as the positive electrode active material, LiCoO 2 , LiMnO 2 . One kind of lithium metal oxide selected from LiNiO 2 is used, and a carbonaceous material containing carbon is used as the negative electrode active material.

이하 본 발명의 구성을 바람직한 실시형태를 들어 보다 상세히 설명한다. 본 발명의 설명에서 종래의 구성요소와 동일한 부분은 설명의 명료성을 들어 동일한 부호를 사용한다.Hereinafter, the configuration of the present invention will be described in more detail with preferred embodiments. In the description of the present invention, the same parts as those of the conventional components are given the same reference numerals for clarity of explanation.

리튬이온 이차 전지의 제조과정은, Al, Ni 또는 동박으로 이루어진 양·음극 기재에 페이스트 상으로 된 양·음극 활물질 슬러리를 각각 일정두께로 도포한 후, 건조로에서 건조시키고 롤 프레싱하여 일정두께의 양음극 활물질이 도포된 양음극 기재를 얻는다.In the manufacturing process of the lithium ion secondary battery, a positive and negative electrode active material slurry in paste form is applied to a positive and negative electrode substrate made of Al, Ni, or copper foil, respectively, to a predetermined thickness, and then dried in a drying furnace and roll pressed to produce a constant thickness. A positive electrode substrate coated with a negative electrode active material is obtained.

얻어진 양음극 기재를 원하는 크기로 절단한 다음, 세퍼레이터와 함께 밀착시켜 전극군을 형성하고, 밀착된 전극군의 선단부에 맨드렐(mandrel)을 끼워 스파이럴 모양으로 권취한 후, 양극 기재에는 양극탭을, 음극기재에는 음극리드를 접속한다.After cutting the obtained positive electrode substrate to a desired size, it is brought into close contact with the separator to form an electrode group, and a mandrel is wound around the end of the adhered electrode group to be wound in a spiral shape. The negative electrode lead is connected to the negative electrode base material.

그리고 전극군의 양단부에 절연링을 대면시킨 후, 캔에 넣고 음극리드를 캔의 내부 하단면에 용접 혹은 음극을 캔 내면에 직접 적촉시킨 다음, 캔의 내부에 전해액을 주입하고 캔의 개구에 절연가스킷을 덧대고 그 안쪽에 상기 양극탭과 접속되는 안전변이 내장된 캡어셈블리를 위치시킨 후 캔을 크림핑하여 밀봉하므로 제조되어진다.The insulating rings face both ends of the electrode group, and then placed in a can, a cathode lead is welded to the inner bottom surface of the can, or a cathode is directly wetted to the inner surface of the can, an electrolyte is injected into the can, and an insulation of the can is insulated. It is manufactured by padding a gasket and placing a cap assembly in which a safety valve connected to the positive electrode tab is located therein, and then crimping and sealing the can.

도 1에서와 같이, 리튬이온 이자전지의 전극군(10)은 시트상의 정극(12), 부극(14) 및 세퍼레이터(16)로 나누어지며, 세퍼레이터(16)를 사이에 두고 정극(12)과 부극(14)이 함께 권취되어 젤리 롤 상을 형성한다.As shown in FIG. 1, the electrode group 10 of the lithium ion rechargeable battery is divided into a sheet-shaped positive electrode 12, a negative electrode 14, and a separator 16, with the separator 16 interposed therebetween. The negative electrodes 14 are wound together to form a jelly roll phase.

그러나 종래의 건식법에 의한 세퍼레이터(16)는 기공이 길이 방향으로 배열하고 있으므로 그 강도가 약하여 약한 충격에도 쉽게 찢어진다. 즉, 종래의 세퍼레이터(16)는 안전성 평가 항목중 기계적 강도를 요하는 압축 실험에서, 압축판에 의해 눌려지는 부분이 횡단 방향으로 찢어지게 된다.However, since the pores are arranged in the longitudinal direction of the conventional dry method, the separator 16 is weak in strength because of its weak strength. That is, in the conventional separator 16 in the compression experiment requiring mechanical strength among the safety evaluation items, the portion pressed by the compression plate is torn in the transverse direction.

이러한 점을 고려하여 본 발명에서는 상기 찢어짐이 일축연신으로 인한 기공의 배열형태와 관계가 있는 점에 착안하여, 기공의 분포를 사선 형태로 하여 횡단 강도를 보강함을 특징으로 한다.In view of this point, the present invention focuses on the fact that the tear is related to the arrangement of the pores due to uniaxial stretching, and the transverse strength is reinforced by making the distribution of the pores oblique.

즉, 본 발명은 도 4와 같이 폴리에틸렌, 폴리프로필렌과 같은 폴리올레핀계의 단일 또는 복합 필름을 일축연신하여 다공성 판을 제조하고, 상기 다공성 판을 약간 비스듬히 슬리팅하여 사선 모양의 기공(162)을 갖도록 구성한다. 즉, 상기 사선 모양의 기공(162)은 폴리에틸렌, 폴리프로필렌과 같은 폴리올레핀계의 단일 또는 복합 필름을 도 4에서의 기공(162)이 연장되어 있는 비스듬한 방향으로 일축연신하여 형성한다. 상기 단일 또는 복합 필름을 일축연신하는 방법은 종래의 방법과 동일하다. 다만, 본 발명은 이 필름을 종래와 같이 길이방향으로 평행하게 연신하는 것이 아니라, 길이방향에 비스듬한 방향으로 연신하는 것이다.That is, the present invention is to uniaxially stretch a polyolefin-based single or composite film such as polyethylene, polypropylene as shown in Figure 4 to produce a porous plate, slitting the porous plate slightly obliquely to have a diagonal pores 162 Configure. That is, the diagonal pores 162 are formed by uniaxially stretching a polyolefin-based single or composite film such as polyethylene or polypropylene in an oblique direction in which the pores 162 in FIG. 4 extend. The method of uniaxially stretching the single or composite film is the same as the conventional method. However, this invention does not extend | stretch this film parallel to a longitudinal direction like conventionally, but extend | stretches to a direction oblique to a longitudinal direction.

상기 기공(162)의 방향은 머신 디렉숀(machine direction; 권취 방향) 기준으로 30∼40°로 하는 것이 강도 증대의 관점에서 바람직하다.The direction of the pore 162 is preferably 30 to 40 degrees on the basis of the machine direction (winding direction) from the viewpoint of increasing the strength.

또한, 전지의 정극 활물질로는 LiCoO2, LiMnO2. LiNiO2 중에서 선택한 1종의 리튬금속산화물을 사용하며, 부극 활물질로는 탄소를 함유하는 탄소질재료를 사용한다.In addition, as the positive electrode active material of the battery, LiCoO 2 , LiMnO 2 . One kind of lithium metal oxide selected from LiNiO 2 is used, and a carbonaceous material containing carbon is used as the negative electrode active material.

이상에서 살펴본 바와 같이 본 발명에 따른 실시형태는 종래의 문제점을 실질적으로 해소하고 있다.As described above, the embodiment according to the present invention substantially solves the conventional problems.

즉, 본 발명의 세퍼레이터는 그 기공이 사선 모양으로 분포되도록 하여 횡단 강도를 보완할 수 있으며, 또한 세퍼레이터의 찢어짐으로 인한 급격한 내부 쇼트에 의하여 발생하는 전지의 발화, 파열 및 폭발을 방지할 수 있어 리튬이온 이차전지의 안전성을 향상시킬 수 있다.
즉, 종래 기술의 경우, 도 2에서 볼 수 있듯이, 기공이 세퍼레이터의 길이방향에 평행하게 연장되어 형성되어 있으므로, 이에 수직한 방향인 횡단 방향으로 쉽게 찢어질 수 있다. 그러나, 본원 발명은 도 4에서 볼 수 있듯이, 기공이 세퍼레이터의 길이방향에 사선을 이루도록 연장 형성되어 있으므로, 세퍼레이터의 길이방향에 수직한 방향 및 평행한 방향에 모두 견디기가 용이해질 수 있다. 따라서, 세퍼레이터의 횡단 강도가 보완되며, 이로 인해, 세퍼레이터의 찢어짐이 방지될 수 있다.That is, the separator of the present invention can compensate for the transverse strength by allowing the pores to be distributed in an oblique shape, and can also prevent the fire, rupture and explosion of the battery caused by the rapid internal short-circuit caused by the tearing of the separator. The safety of the ion secondary battery can be improved.
That is, in the case of the prior art, as shown in Figure 2, since the pores are formed extending in parallel to the longitudinal direction of the separator, it can be easily torn in the transverse direction that is perpendicular to this. However, the present invention, as shown in Figure 4, because the pores are formed extending in a diagonal direction in the longitudinal direction of the separator, it can be easy to withstand both in the direction perpendicular to the longitudinal direction and parallel to the separator. Therefore, the transverse strength of the separator is complemented, whereby tearing of the separator can be prevented.

Claims (6)

기공의 분포를 권취 방향에 대하여 사선 형태로 구성하고, 정극 및 부극과 함께 권취되어 전극군을 형성하고,The distribution of the pores is formed in an oblique form with respect to the winding direction, and wound together with the positive electrode and the negative electrode to form an electrode group, 상기 기공의 사선 경사도는 30∼40°인 것을 특징으로 하는 리튬이온 이차전지용 세퍼레이터.The slanted inclination of the pores is a separator for a lithium ion secondary battery, characterized in that 30 to 40 °. 삭제delete 권취 방향에 대하여 사선 형태로 기공이 분포된 세퍼레이터, 정극 및 부극을 함께 권취하여 형성된 전극군을 포함하고,It includes an electrode group formed by winding together a separator, a positive electrode and a negative electrode in which pores are distributed in a diagonal form with respect to the winding direction, 상기 정극 활물질로는 LiCoO2, LiMnO2. LiNiO2 중에서 선택한 1종의 리튬금속산화물을 사용하며, 상기 부극 활물질로는 탄소를 함유하는 탄소질재료를 사용하는 것을 특징으로 하고, Examples of the positive electrode active material include LiCoO 2 and LiMnO 2. One kind of lithium metal oxide selected from LiNiO2 is used, and the carbonaceous material containing carbon is used as the negative electrode active material. 상기 기공의 사선 경사도는 30∼40°인 것을 특징으로 하는 리튬이온 이차전지.The diagonal slope of the pore is a lithium ion secondary battery, characterized in that 30 to 40 °. 삭제delete 제 3 항에 있어서, 상기 세퍼레이터는 폴리올레핀계의 단일 또는 복합 재질을 사용하는 것을 특징으로 하는 리튬이온 이차전지.The lithium ion secondary battery of claim 3, wherein the separator uses a polyolefin-based single or composite material. 삭제delete
KR1019990052635A 1999-11-25 1999-11-25 Separator for Li-ion secondary battery and Li-ion secondary battery utilizing the same KR100696452B1 (en)

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