WO2013062335A1 - 이차전지용 음극 및 이를 구비하는 이차전지 - Google Patents
이차전지용 음극 및 이를 구비하는 이차전지 Download PDFInfo
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- WO2013062335A1 WO2013062335A1 PCT/KR2012/008822 KR2012008822W WO2013062335A1 WO 2013062335 A1 WO2013062335 A1 WO 2013062335A1 KR 2012008822 W KR2012008822 W KR 2012008822W WO 2013062335 A1 WO2013062335 A1 WO 2013062335A1
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- active material
- current collector
- secondary battery
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- negative electrode
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- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
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- H01M4/134—Electrodes based on metals, Si or alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
Definitions
- the present invention relates to a negative electrode suitable for a secondary battery and a secondary battery having the same, and more particularly, to a negative electrode having a spiral cathode and a conductive layer.
- a secondary battery is a device that converts external electrical energy into chemical energy, stores it, and generates electricity when needed.
- the term “rechargeable battery” is also used to mean that it can be charged multiple times.
- Commonly used secondary batteries include lead storage batteries, nickel cadmium batteries (NiCd), nickel hydrogen storage batteries (NiMH), lithium ion batteries (Li-ion), and lithium ion polymer batteries (Li-ion polymer). Secondary batteries offer both economic and environmental advantages over primary batteries that are used once and discarded.
- Secondary batteries are currently used where low power is used. Examples are devices, handhelds, tools, and uninterruptible power supplies that help start up the car. Recently, the development of wireless communication technology has led to the popularization of portable devices, and there is also a tendency to wirelessize many kinds of conventional devices, and the demand for secondary batteries is exploding. In addition, hybrid vehicles and electric vehicles have been put to practical use in terms of prevention of environmental pollution, and these next-generation vehicles employ technologies that use secondary batteries to reduce value, weight, and increase lifespan.
- secondary batteries are cylindrical, rectangular or pouch type batteries. This is because the secondary battery is manufactured by mounting an electrode assembly composed of a negative electrode, a positive electrode, and a separator inside a pouch-shaped case of a cylindrical or rectangular metal can or an aluminum laminate sheet, and injecting an electrolyte into the electrode assembly. Therefore, since a certain space for mounting the secondary battery is essentially required, the cylindrical, square or pouch type of the secondary battery has a problem in that it acts as a limitation for the development of various types of portable devices. Accordingly, there is a need for a new type of secondary battery capable of various forms, and a linear battery having a very large ratio of lengths to a cross-sectional diameter having excellent flexibility has been proposed.
- the cable type secondary battery requiring such flexibility has a high possibility of disconnection due to its external physical shock such as a case where the secondary battery is bent due to its structural characteristics.
- the active material is detached due to expansion and contraction of the electrode due to repeated charging and discharging.
- it is difficult to diffuse lithium ions into the negative electrode active material layer.
- the problem to be solved by the present invention is to provide a secondary battery negative electrode of the spiral twisted type, excellent in electrochemical reactivity, excellent resistance to stress and pressure in the battery.
- the present invention is a spiral cathode in which at least two or more wire-type negative electrodes having a negative electrode active material layer coated on the surface of the wire-type current collector is disposed in parallel with each other and spirally twisted; And a conductive layer formed to surround the spiral cathode together.
- the twist rate of the spiral cathode is preferably 0.01 to 10 mm / time .
- wire-type current collector of this invention Stainless steel, aluminum, nickel, titanium, calcined carbon, copper; Stainless steel surface-treated with carbon, nickel, titanium or silver; Aluminum-cadmium alloys; It is possible to use a non-conductive polymer or a conductive polymer surface-treated with a conductive material.
- the conductive material one or a mixture of two or more selected from polyacetylene, polyaniline, polypyrrole, polythiophene and polysulfuride, ITO (Indum Thin Oxide), copper, silver, palladium and nickel may be used.
- the kind of the conductive polymer is not particularly limited, but one kind of compound selected from polyacetylene, polyaniline, polypyrrole, polythiophene and polysulfuritride, or a mixture of two or more kinds thereof may be used.
- the anode active material layer is Si, Sn, Li, Zn, Mg, Cd, Ce, Ni or Fe metals (Me); Alloys composed of the metals (Me); Oxides of the metals (Me) (MeOx); And it may include any one active material particles or a mixture of two or more thereof selected from the group consisting of a complex of the metals (Me) and carbon, but is not limited thereto.
- the conductive layer of the present invention comprises a mixture of carbon particles and a polymeric binder.
- the carbon particles are not particularly limited in kind, but the carbon particles may be one compound selected from carbon black, acetylene black, ketjen black, denca black, and carbon fiber, or a mixture of two or more thereof.
- the polymer binder is not particularly limited in kind, but polyvinylidene fluoride-co-hexafluoropropylene and polyvinylidene fluoride-trichloroethylene trichloroethylene, polymethylmethacrylate, polybutylacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, polyvinyl alcohol ), Ethylene vinyl co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate pro Cypionate (cellulose acetate pro pionate, cyanoethylpullulan, cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, styrene-butadiene rubber -any one binder selected from the group consisting of -butadiene rubber) and carboxyl methyl cellulose, or a
- the present invention provides a secondary battery using the positive electrode, the negative electrode and the separation layer, and further comprising an internal electrode including at least one of the secondary battery negative electrode;
- a separation layer filling the inner electrode and filling the ions; It may be a cable type secondary battery that surrounds the outer surface of the separation layer, and has an external electrode which is a positive electrode including a positive electrode active material layer and a positive electrode current collector, and a protective coating disposed around the external electrode.
- the separation layer may be an electrolyte layer or a separator.
- the present invention uses a spiral cathode in which a plurality of strands are spirally twisted, and thus, the thickness of the coated cathode active material layer is thinner than that of a single strand of cathode coated with the same anode active material, thereby facilitating diffusion of Li ions. This is excellent.
- the reaction surface area with Li ions in the charging and discharging process is increased, thereby improving the rate characteristic of the battery.
- the negative electrode of the present invention since the negative electrode of the present invention has a conductive layer on its surface, separation of the negative electrode active material due to volume expansion during charging and discharging can be prevented or alleviated, and isolation of the negative electrode active material can be eliminated.
- the negative electrode of the present invention can minimize the occurrence of side reactions with the electrolyte by inhibiting the isolation of the negative electrode active material and the generation of new surfaces due to the presence of the conductive layer.
- FIG. 1 is a perspective view schematically showing a cathode according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of FIG. 1.
- FIG 3 is a cross-sectional view of a cable type secondary battery according to an embodiment of the present invention.
- FIG. 4 is a cross-sectional view of a cable type secondary battery according to an embodiment of the present invention.
- FIG. 5 is a charge and discharge graph of Example 1.
- FIG. 6 is a charge / discharge graph of Comparative Example 1.
- At least two or more wired negative electrodes 10 having the negative electrode active material layer 12 coated on the surface of the wire-type current collector 11 are parallel to each other.
- the spiral cathode of the present invention is a spiral twist of several strands of wire-like cathode 10, but is not limited to a specific twisted shape, but after placing several strands of wire-like cathode 10 in parallel to each other It may be twisted together, or may be used as braiding long hairs while staggering several strands of wire-like cathodes 10 one by one.
- Li ions realize electrochemical properties through an alloying / dealloying process.
- the electronic contact between the metal active materials deteriorates, so that the movement of Li ions into the metal layer of the negative electrode active material is inhibited, resulting in deterioration of the cycle.
- the metal of the formed metal-based negative electrode active material layer has a high density and a thick layer, the Li ion is difficult to diffuse into the negative electrode active material metal layer, thereby limiting the implementation of capacity and having a poor rate characteristic.
- the negative electrode 30 of the present invention since a plurality of wire-shaped negative electrode 10 coated with the negative electrode active material 12 is twisted and overlapped on the surface of the wire-shaped current collector 11, Li in the charge and discharge process.
- the reaction surface area with ions is increased to improve battery performance.
- the rate characteristics of the battery may be improved by using the thin wire type negative electrode 10 having the negative electrode active material layer 12.
- the cathode 30 of this invention is equipped with the conductive layer 20 on the surface.
- the conductive layer 20 may serve as a buffer that can prevent or alleviate the detachment of the metal-based negative electrode active material due to volume expansion during charge and discharge.
- the conductive layer 20 includes carbon particles having excellent conductivity, isolation of the metal-based anode active material can be eliminated. This can contribute to the improvement of the initial efficiency and the cycle life characteristics.
- the metal-based active material layer has low affinity with the organic electrolyte, and in general, since the metal-based active material layer does not contain pores and does not include a binder that may contain the organic electrolyte, it is difficult to introduce the organic electrolyte into the interior. For this reason, a problem arises in that the capacity implementation of the battery is lowered and the resistance is increased. On the other hand, since the pores are formed in the conductive layer of the present invention and include a binder, the conductive layer can easily transfer the organic electrolyte to the metal-based active material layer.
- the negative electrode of the present invention can minimize the occurrence of side reactions with the electrolyte by inhibiting the isolation of the negative electrode active material and the generation of new surfaces due to the presence of the conductive layer.
- the twist rate of the spiral cathode is preferably 0.01 to 10 mm / time .
- the twist rate is the length of the negative electrode divided by the number of twists, and the smaller the value is, the higher the degree of twist is.
- the twist rate exceeds 10 mm / time, the area of contact between the wire-shaped cathodes 10 is too small, so that the effect of surface area increase is insignificant, and if the twist rate is less than 0.01 mm / time, the degree of twist is excessive and the cathode is excessive. Damage to the wire-shaped negative electrode 10 such as detachment of the active material layer and disconnection of the current collector may occur.
- the wire-shaped current collector 11 used in the present invention is not particularly limited in kind, but is stainless steel, aluminum, nickel, titanium, calcined carbon, copper; Stainless steel surface-treated with carbon, nickel, titanium or silver; Aluminum-cadmium alloys; It is possible to use a non-conductive polymer or a conductive polymer surface-treated with a conductive material.
- the conductive agent one or a mixture of two or more selected from polyacetylene, polyaniline, polypyrrole, polythiophene and polysulfuride, ITO (Indum Thin Oxide), copper, silver, palladium and nickel may be used. It is not limited.
- the kind of the conductive polymer is not particularly limited, but one kind of compound selected from polyacetylene, polyaniline, polypyrrole, polythiophene and polysulfuritride, or a mixture of two or more kinds thereof may be used.
- the anode active material layer of the present invention is Si, Sn, Li, Zn, Mg, Cd, Ce, Ni or Fe metals (Me); Alloys composed of the metals (Me); Oxides of the metals (Me) (MeOx); And it may include any one active material particles or a mixture of two or more thereof selected from the group consisting of a complex of the metals (Me) and carbon.
- the wire-type negative electrode of the present invention may use a negative electrode having a porous negative electrode active material layer formed on the outer surface of the current collector by using an electroplating method or anodizing treatment.
- an active material layer is formed on the surface of the current collector by the electroplating method, hydrogen gas is generated, and the amount of hydrogen generated and the size of the generated hydrogen bubbles are adjusted to control the three-dimensional pore structure having a desired pore size.
- An active material layer can be formed.
- a metal oxide-based active material layer may be formed on the surface of the current collector by using an anodization treatment method. In such a case, an active material layer made of a metal oxide having a pore structure having a one-dimensional channel shape may be formed by adjusting the amount of oxygen gas and the bubble size generated under anodizing conditions.
- the conductive layer of the present invention may include a mixture of carbon particles and a polymer binder. Although the kind is not specifically limited as such carbon particles, One compound selected from carbon black, acetylene black, ketjen black, denka black, and carbon fiber, or a mixture of two or more thereof may be used.
- the polymer binder is not particularly limited in kind, but polyvinylidene fluoride-co-hexafluoropropylene and polyvinylidene fluoride-trichloroethylene trichloroethylene, polymethylmethacrylate, polybutylacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, polyvinyl alcohol ), Ethylene vinyl co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate pro Cypionate (cellulose acetate propio nate, cyanoethylpullulan, cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, styrene-butadiene rubber -any one binder selected from the group consisting of -butadiene rubber) and carboxyl methyl cellulose, or
- the negative electrode of the present invention described above is combined with the positive electrode to form an electrode structure and is provided with a lithium secondary battery.
- the positive electrode and the electrolyte constituting the electrode structure all of those conventionally used in manufacturing a lithium secondary battery may be used.
- the separation layer may be an electrolyte layer or a separator.
- the cable type secondary battery 200 of the present invention includes an internal electrode including the cathode 230; A separation layer 240 filled around the inner electrode and serving as a passage of ions; An external electrode surrounding the outer surface of the separation layer and being an anode including a cathode active material layer and a cathode current collector; And a protective coating 270 disposed around the external electrode.
- an electrolyte layer or a separator may be used as the separation layer of the present invention.
- a gel polymer electrolyte using PEO, PVdF, PVdF-HFP, PMMA, PAN or PVAC As the electrolyte, a gel polymer electrolyte using PEO, PVdF, PVdF-HFP, PMMA, PAN or PVAC; Alternatively, a solid electrolyte using PEO, polypropylene oxide (PPO), polyethylene imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc) may be used.
- PEO polypropylene oxide
- PEI polyethylene imine
- PES polyethylene sulphide
- PVAc polyvinyl acetate
- the electrolyte may further include a lithium salt, such lithium salt is LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 )
- the separator is not limited to a kind thereof, but a porous material made of a polyolefin-based polymer selected from the group consisting of ethylene homopolymer, propylene homopolymer, ethylene-butene copolymer, ethylene-hexene copolymer and ethylene-methacrylate copolymer.
- a porous substrate made of a polymer selected from the group consisting of polyester, polyacetal, polyamide, polycarbonate, polyimide, polyether ether ketone, polyethersulfone, polyphenylene oxide, polyphenylene sulfite and polyethylene naphthalene;
- a porous substrate formed of a mixture of inorganic particles and a binder polymer may be used.
- the polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, polyphenylene oxide, and polyphenylene sulfone It is preferable to use a separator of a nonwoven material corresponding to a porous substrate made of a polymer selected from the group consisting of pit and polyethylene naphthalene.
- the positive electrode which is an external electrode of the cable type secondary battery, is coated with the positive electrode active material 250 on the positive electrode current collector 260, and more specifically, the positive electrode active material layer formed around the outer surface of the separation layer and the positive electrode active material layer.
- a positive electrode current collector formed to surround an outer surface, a positive electrode current collector formed to surround the outer surface of the separation layer and a positive electrode active material layer formed to surround the outer surface of the positive electrode current collector, or surrounding the outer surface of the separation layer
- the positive electrode current collector is not particularly limited in shape, but it is preferable to use a pipe current collector, a wound wire current collector, a wound sheet current collector, or a mesh current collector.
- the positive electrode current collector is stainless steel, aluminum, nickel, titanium, calcined carbon, copper; Stainless steel surface-treated with carbon, nickel, titanium, or silver; Aluminum-cadmium alloys; Non-conductive polymer surface-treated with a conductive material; Conductive polymers; A metal paste comprising a metal powder of Ni, Al, Au, Ag, Al, Pd / Ag, Cr, Ta, Cu, Ba, or ITO; Or a carbon paste including carbon powder which is graphite, carbon black, or carbon nanotubes.
- the external electrode may include an external electrode active material and an external current collector.
- the external electrode active material layer may be previously formed on the external current collector, and then applied to the separation layer to form the external electrode.
- a sheet external electrode may be prepared by forming an external electrode active material layer on the sheet current collector and cutting the sheet to have a predetermined width. Thereafter, the prepared sheet type external electrode may be wound around the separation layer so that the external electrode active material layer contacts the separation layer, thereby forming the external electrode on the separation layer.
- the external current collector may be formed first to surround the outer surface of the separation layer, and the external electrode active material layer may be formed to surround the external surface of the external current collector.
- the external electrode has a structure having an outer current collector formed surrounding the outer surface of the separation layer and the outer electrode active material layer formed to contact the separation layer surrounding the outer surface of the outer current collector, first of the separation layer
- a wire type or sheet type external current collector is wound on the outer surface.
- the winding method is not particularly limited, but in the case of a wire-type external current collector, a winding machine may be applied to the outer surface of the separation layer.
- the outer electrode active material layer is formed on the outer surface of the wound wire type or sheet type outer current collector.
- the external electrode active material layer surrounds the wound wire-type external current collector and is formed to contact the separator layer.
- a structure including an external electrode active material layer formed to surround the outer surface of the separation layer, and an external current collector that is covered in the external electrode active material layer and surrounds the outer surface of the separation layer in a spaced apart state.
- a part of the external electrode active material layer to be finally obtained on the outer surface of the separation layer is first formed, and is formed to surround the external current collector on the upper portion, and again the external electrode active material layer on the external current collector Is further formed to completely cover the external current collector.
- the external current collector is spaced apart from the separation layer and is present inside the external electrode active material layer, electrical contact between the current collector and the active material may be improved, thereby contributing to improvement of characteristics of the battery.
- the electrode active material which is a negative electrode active material or a positive electrode active material, includes a binder and a conductive material and may be combined with a current collector to form an electrode.
- deformation occurs, such as the electrode being folded or severely bent by an external force, detachment of the electrode active material occurs. Due to the detachment of the electrode active material, a decrease in battery performance and battery capacity occurs.
- the wound wire-type current collector since the wound wire-type current collector has elasticity, it plays a role of dispersing the force during deformation due to external force, and thus less deformation of the active material layer occurs, thereby preventing detachment of the active material.
- the positive electrode may be manufactured using a method of extrusion coating an electrode slurry containing a positive electrode active material to a current collector through an extruder.
- the outside of the internal electrode may be coated with a separation layer 240 or manufactured by inserting the internal electrode into the separation layer 240.
- the internal electrode and the separation layer 240 may be formed, and the external electrodes 250 and 260 and the protective coating 270 may be formed on the outer surface thereof.
- the internal electrodes may be inserted into the separation layer 240, or the external electrodes 250 and 260 and the protective coating 270 may be formed. After the formation of the method is also possible by inserting the internal electrode and filling the separation layer 240 by manufacturing.
- the protective coating of the present invention is formed on the outer surface of the battery as an insulator to protect the electrode against moisture and external shock in the air.
- a conventional polymer resin can be used.
- PVC, HDPE or epoxy resin can be used.
- a cable type secondary battery 300 using multiple negative electrodes 330 of the present invention is also possible. Since the contact area is increased by the plurality of internal electrodes 330, the battery cell has a high battery rate and the capacity balance between the internal electrodes and the external electrodes can be easily adjusted by controlling the number of internal electrodes.
- the external electrode includes a cathode active material layer and an anode active material layer formed surrounding the outer surface of the separation layer.
- it may have a structure including a positive electrode active material layer formed surrounding the outer surface of the separation layer, and a positive electrode current collector which is coated in the positive electrode active material layer, and surrounds the outer surface of the separation layer spaced apart.
- Sn-Ni was electroplated to a thickness of 2.5 ⁇ m on the surface of a wire-shaped Cu current collector having a diameter of 150 ⁇ m to prepare a negative electrode coated with a negative electrode active material layer. Thereafter, the negative electrode was prepared in three strands to spirally prepare a spiral cathode.
- the conductive layer solution was prepared using NMP as a solvent by mixing carbon fiber and PVdF in a 60:40 weight ratio.
- the outer surface of the spiral cathode was coated using the prepared conductive layer solution to prepare a negative electrode.
- Sn-Ni was electroplated to a thickness of 2.5 ⁇ m on the surface of a wire-shaped Cu current collector having a diameter of 150 ⁇ m to prepare a negative electrode coated with a negative electrode active material layer. Thereafter, the negative electrode was prepared by twisting three strands of the negative electrode in a spiral manner.
- Metal lithium foil was used as the positive electrode, and negative electrodes prepared in Example 1 and Comparative Example 1 were used.
- An electrode assembly was manufactured through a polyethylene separator between the positive electrode and the negative electrode.
- Example 1 According to Table 1, the initial efficiency of Example 1 corresponds to 88.7%, it can be seen that the initial efficiency of Comparative Example 1 without a conductive layer is much higher than the initial efficiency of 73.9%. 5-6, it can be seen that the initial efficiency of Example 1 is superior to that of Comparative Example 1.
- the conductive layer acts to mitigate the detachment of the active material due to the volume expansion of the metal-based active material, thereby improving the electrical conductivity in the negative electrode. It seems that the initial efficiency of is improved.
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Abstract
Description
1st 사이클 | |||
충전용량(mAh/g) | 방전용량(mAh/g) | 초기효율(%) | |
실시예 1 | 887.8 | 787.9 | 88.7 |
비교예 1 | 868.3 | 642.5 | 73.9 |
Claims (20)
- 와이어형 집전체의 표면에 음극 활물질층이 코팅되어 있는 적어도 2 이상의 와이어형 음극이 서로 평행하게 배치되어 나선형으로 꼬여 있는 나선음극; 및상기 나선음극을 둘러싸며 형성된 도전층;을 구비하는 이차전지용 음극.
- 제1항에 있어서,상기 나선음극의 꼬임율은 0.01 ~ 10 mm/회인 것을 특징으로 하는 이차전지용 음극.
- 제1항에 있어서,상기 와이어형 집전체는 스테인리스스틸, 알루미늄, 니켈, 티탄, 소성탄소, 구리; 카본, 니켈, 티탄 또는 은으로 표면처리한 스테인리스스틸; 알루미늄-카드뮴합금; 도전재로 표면처리된 비전도성 고분자 또는 전도성 고분자로 제조된 것을 특징으로 하는 이차전지용 음극.
- 제3항에 있어서,상기 도전재는 폴리아세틸렌, 폴리아닐린, 폴리피롤, 폴리티오펜 및 폴리설퍼니트리드, ITO(Indum Thin Oxide), 구리, 은, 팔라듐 및 니켈 중에서 선택된 1종 또는 2종 이상의 혼합물을 포함하는 것을 특징으로 하는 이차전지용 음극.
- 제3항에 있어서,상기 전도성 고분자는 폴리아세틸렌, 폴리아닐린, 폴리피롤, 폴리티오펜 및 폴리설퍼니트리드 중에서 선택된 1종의 화합물 또는 2종 이상의 혼합물인 고분자를 포함하는 것을 특징으로 하는 이차전지용 음극.
- 제1항에 있어서,상기 음극활물질층은 Si, Sn, Li, Zn, Mg, Cd, Ce, Ni 또는 Fe인 금속류(Me); 상기 금속류(Me)로 구성된 합금류; 상기 금속류(Me)의 산화물(MeOx); 및 상기 금속류(Me)와 탄소와의 복합체로 이루어진 군으로부터 선택된 어느 하나의 활물질 입자 또는 이들 중 2종 이상의 혼합물을 포함하는 것을 특징으로 하는 이차전지용 음극.
- 제1항에 있어서,상기 도전층은 탄소입자 및 고분자 바인더의 혼합물을 포함하는 것을 특징으로 하는 이차전지용 음극.
- 제7항에 있어서,상기 탄소입자는 카본블랙, 아세틸렌블랙, 케첸블랙, 덴카블랙 및 탄소섬유 중에서 선택된 1종의 화합물 또는 2종 이상의 혼합물을 사용하여 제조되는 것을 특징으로 하는 이차전지용 음극.
- 제7항에 있어서,상기 고분자 바인더는 폴리비닐리덴 플루오라이드-헥사플루오로프로필렌 (polyvinylidene fluoride-co-hexafluoropropylene), 폴리비닐리덴 플루오라이드-트리클로로에틸렌 (polyvinylidene fluoride-co-trichloroethylene), 폴리메틸메타크릴레이트 (polymethylmethacrylate), 폴리부틸아크릴레이트(polybutylacrylate), 폴리아크릴로니트릴 (polyacrylonitrile), 폴리비닐피롤리돈 (polyvinylpyrrolidone), 폴리비닐아세테이트 (polyvinylacetate), 폴리비닐알콜(polyvinyl alcohol), 에틸렌 비닐 아세테이트 공중합체 (polyethylene-co-vinyl acetate), 폴리에틸렌옥사이드 (polyethylene oxide), 폴리아릴레이트(polyarylate), 셀룰로오스 아세테이트 (cellulose acetate), 셀룰로오스 아세테이트 부틸레이트 (cellulose acetate butyrate), 셀룰로오스 아세테이트 프로피오네이트 (cellulose acetate propionate), 시아노에틸플루란 (cyanoethylpullulan), 시아노에틸폴리비닐알콜 (cyanoethylpolyvinylalcohol), 시아노에틸셀룰로오스 (cyanoethylcellulose), 시아노에틸수크로오스 (cyanoethylsucrose), 플루란 (pullulan), 스티렌-부타디엔 고무 (styrene-butadiene rubber) 및 카르복실 메틸 셀룰로오스 (carboxyl methyl cellulose)로 이루어진 군으로부터 선택된 어느 하나의 바인더 또는 2종 이상의 혼합물인 것을 특징으로 하는 이차전지용 음극.
- 양극, 음극 및 분리층을 구비하는 이차전지에 있어서,상기 음극은 제1항 내지 제9항 중 어느 한 항의 상기 음극인 것을 특징으로 하는 이차전지.
- 제10항에 있어서,상기 분리층은 전해질층 또는 세퍼레이터인 것을 특징으로 하는 이차전지.
- 제1항 내지 제9항 중 어느 한 항의 상기 음극을 적어도 1개 이상 포함하는 내부전극;상기 내부전극을 둘러싸며 충진된, 이온의 통로가 되는 분리층;상기 분리층의 외면을 둘러싸고, 양극활물질층과 양극집전체를 구비하는 양극인 외부전극; 및상기 외부전극의 둘레에 배치되는 보호피복을 구비하는 케이블형 이차전지.
- 제12항에 있어서,상기 분리층은 전해질층 또는 세퍼레이터인 것을 특징으로 하는 케이블형 이차전지.
- 제13항에 있어서,상기 전해질층은 PEO, PVdF, PVdF-HFP, PMMA, PAN 또는 PVAC를 사용한 겔형 고분자 전해질; 또는 PEO, PPO(polypropylene oxide), PEI(polyethylene imine), PES(polyethylene sulphide) 또는 PVAc(polyvinyl acetate)를 사용한 고체 전해질; 중에서 선택된 전해질을 포함하는 것을 특징으로 하는 케이블형 이차전지.
- 제13항에 있어서,상기 전해질층은 리튬염을 더 포함하는 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 리튬염은 LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2)2NLi, 클로로보란리튬, 저급지방족카르본산리튬 및 테트라페닐붕산리튬 중에서 선택된 1종 또는 2종 이상인 것을 특징으로 하는 케이블형 이차전지.
- 제13항에 있어서,상기 세퍼레이터는 에틸렌 단독중합체, 프로필렌 단독중합체, 에틸렌-부텐 공중합체, 에틸렌-헥센 공중합체 및 에틸렌-메타크릴레이트 공중합체로 이루어진 군에서 선택된 폴리올레핀계 고분자로 제조한 다공성 기재; 폴리에스테르, 폴리아세탈, 폴리아미드, 폴리카보네이트, 폴리이미드, 폴리에테르에테르케톤, 폴리에테르설폰, 폴리페닐렌옥사이드, 폴리페닐렌설파이트 및 폴리에틸렌나프탈렌으로 이루어진 군에서 선택된 고분자로 제조한 다공성 기재; 또는 무기물 입자 및 바인더 고분자의 혼합물로 형성된 다공성 기재인 것을 특징으로 하는 케이블형 이차전지.
- 제12항에 있어서,상기 외부전극은, 상기 분리층의 외면을 둘러싸며 형성된 양극활물질층과 상기 양극활물질층의 외면을 둘러싸며 형성된 양극집전체를 구비하거나,상기 분리층의 외면을 둘러싸며 형성된 양극집전체와 상기 양극집전체의 외면을 둘러싸며 형성된 양극활물질층을 구비하거나,상기 분리층의 외면을 둘러싸며 형성된 양극집전체와 상기 양극집전체의 외면을 둘러싸며 상기 분리층과 접촉하도록 형성된 양극활물질층을 구비하거나, 또는상기 분리층의 외면을 둘러싸며 형성된 양극활물질층, 및 상기 양극활물질층 내에 피복되어 있고, 상기 분리층의 외면을 이격된 상태로 둘러싸며 형성된 양극집전체를 구비하는 것을 특징으로 하는 케이블형 이차전지.
- 제12항에 있어서,상기 양극집전체는 파이프형 집전체, 권선된 와이어형 집전체, 권선된 시트형 집전체 또는 메쉬형 집전체인 것을 특징으로 하는 케이블형 이차전지.
- 제12항에 있어서,상기 양극집전체는 스테인리스스틸, 알루미늄, 니켈, 티탄, 소성탄소, 구리; 카본, 니켈, 티탄 또는 은으로 표면처리된 스테인리스스틸; 알루미늄-카드뮴합금; 도전재로 표면처리된 비전도성 고분자; 전도성 고분자; Ni, Al, Au, Ag, Al, Pd/Ag, Cr, Ta, Cu, Ba 또는 ITO인 금속분말을 포함하는 금속 페이스트; 또는 흑연, 카본블랙 또는 탄소나노튜브인 탄소분말을 포함하는 탄소 페이스트;로 제조된 것을 특징으로 하는 케이블형 이차전지.
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EP12844524.4A EP2772966B1 (en) | 2011-10-25 | 2012-10-25 | Cathode for secondary battery and secondary battery having same |
JP2014537004A JP5748922B2 (ja) | 2011-10-25 | 2012-10-25 | 二次電池用負極、及びそれを備える二次電池 |
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EP2822059B1 (en) | 2013-04-29 | 2017-03-01 | LG Chem, Ltd. | Packaging for cable-type secondary battery and cable-type secondary battery comprising same |
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CN104393329B (zh) | 2013-05-07 | 2017-04-12 | 株式会社Lg化学 | 线缆型二次电池及其制备 |
WO2014182064A1 (ko) | 2013-05-07 | 2014-11-13 | 주식회사 엘지화학 | 이차전지용 전극, 그의 제조방법, 그를 포함하는 이차전지 및 케이블형 이차전지 |
KR101644819B1 (ko) * | 2013-11-27 | 2016-08-02 | 주식회사 엘지화학 | 이차전지용 음극 및 이를 구비하는 이차전지 |
US9537154B2 (en) | 2013-11-27 | 2017-01-03 | Lg Chem, Ltd. | Anode for secondary battery and secondary battery having the same |
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CN103891011A (zh) | 2014-06-25 |
CN103891011B (zh) | 2017-09-19 |
JP2014531121A (ja) | 2014-11-20 |
JP5748922B2 (ja) | 2015-07-15 |
KR101440940B1 (ko) | 2014-09-17 |
EP2772966A4 (en) | 2015-04-22 |
US8835057B2 (en) | 2014-09-16 |
US20140170453A1 (en) | 2014-06-19 |
KR20130045220A (ko) | 2013-05-03 |
EP2772966A1 (en) | 2014-09-03 |
EP2772966B1 (en) | 2016-11-23 |
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