WO2006132474A1 - Poudre ptc, batterie secondaire au lithium comprenant une poudre ptc et son procede de fabrication - Google Patents

Poudre ptc, batterie secondaire au lithium comprenant une poudre ptc et son procede de fabrication Download PDF

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Publication number
WO2006132474A1
WO2006132474A1 PCT/KR2006/001705 KR2006001705W WO2006132474A1 WO 2006132474 A1 WO2006132474 A1 WO 2006132474A1 KR 2006001705 W KR2006001705 W KR 2006001705W WO 2006132474 A1 WO2006132474 A1 WO 2006132474A1
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Prior art keywords
positive electrode
negative electrode
ptc
ptc powder
powder
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PCT/KR2006/001705
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English (en)
Inventor
Su-An Choi
Ju-Dam Kim
Byoung-Kwang Lee
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Ls Cable Ltd.
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Publication of WO2006132474A1 publication Critical patent/WO2006132474A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/002—Inhomogeneous material in general
    • H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
    • H01C7/027—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient consisting of conducting or semi-conducting material dispersed in a non-conductive organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • H01M2200/106—PTC
    • 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

Definitions

  • the present invention relates to PTC (Positive Temperature Coefficient) powder, a lithium secondary battery including PTC powder, and its manufacturing method, and more particularly to PTC powder especially suitable for a lithium secondary battery, a lithium secondary battery with safety against abnormal current or overcurrent by using the PTC powder, and its manufacturing method.
  • PTC Physical Temperature Coefficient
  • Japanese patent publication No. 2000-164206 suggests a method of disposing a conductive middle layer, which is changed into a high resistive element by overcharge, between a positive electrode current collector and an active material layer, but this method also has problems that processes and costs are increased.
  • Japanese patent publication H10-64548 and H10-64549 suggest a method of adding a cooling material with cooling capacity over 30 J/g to an electrode plate, but it is revealed in an actual overcharge experiment that it is not competent enough for absorbing a large quantity of heat that is instantaneously generated.
  • the present invention is designed in consideration of the above problems, and therefore it is an object of the invention to provide PTC powder included as a component of a lithium secondary battery and capable of breaking an electric current when temperature of the battery is raised up due to internal or external factors in order to prevent fire or explosion without causing deterioration of performance of the battery in a normal operation, a high-safety lithium secondary battery using the PTC powder, and its manufacturing method.
  • the inventors developed a lithium secondary battery containing PTC powder into a positive or negative electrode of the lithium secondary battery, which includes a positive electrode, a negative electrode and electrolyte, separately from common conductive materials, and filed it with a patent application No. 2003-0070605 on October 10, 2003 in Korea.
  • the inventors have subsequently studied PTC powder suitable for the lithium secondary bat tery over and over and then developed the present invention.
  • the PTC powder is to be included in a positive electrode material layer or a negative electrode material layer of a lithium secondary battery including a positive electrode having a positive electrode current collector and a positive electrode material layer, a negative electrode having a negative electrode current collector and a negative electrode material layer, and electrolyte, and the PTC powder has a form of crystalline polymer powder in which a granular conductive filler is dispersed.
  • the PTC powder has a specific resistance of 0.01 to 10 ⁇ -D and an average particle diameter corresponding to 5 to 90% of a thickness of the positive electrode material layer or the negative electrode material layer and includes the crystalline polymer to be 30 to 70 wt% thereof, and the crystalline polymer has a crosslink density of 1 to 70%, the degree of crystallinity of 10 to 80%, a melting temperature of 60 to 18O 0 C, and a heat of fusion of 20 J/g or above.
  • a lithium secondary battery having the PTC powder with the above characteristics includes a positive electrode, a negative electrode and electrolyte, wherein the positive electrode includes a positive electrode current collector; and a positive electrode material layer formed on the positive electrode current collector and having a positive electrode active material capable of occluding and emitting lithium ions and a binding material for binding the positive electrode current collector and the positive electrode active material, wherein the negative electrode includes a negative electrode current collector; and a negative electrode material layer formed on the negative electrode current collector and having a negative electrode active material capable of occluding and emitting lithium ions and a binding material for binding the negative electrode current collector and the negative electrode active material, and wherein at least one of the positive electrode material layer and the negative electrode material layer further includes the above PTC powder.
  • the lithium secondary battery according to the present invention does not deteriorate performance of the battery by means of the conductive material with a very low electric resistance at a normal operation, but breaks an electric current by means of the PTC powder whose electric resistance is abruptly increased at a high temperature when the second battery malfunctions due to overcharging or the like, so the lithium secondary battery is free from any danger of firing or explosion.
  • a method for manufacturing a lithium secondary battery according to the present invention may further include PTC powder with the above PTC characteristics, namely increasing an electric resistance along with the rise of temperature, during the process of preparing the positive electrode slurry or the negative electrode slurry.
  • FIG. 1 is a sectional view schematically showing a lithium secondary battery including PTC powder according to a preferred embodiment of the present invention.
  • FIG. 2 is a graph showing how an electric resistance is changed depending on the increase of temperature of the PTC powder according to the embodiment of the present invention in comparison to that of PTC powder according to a comparative example. Best Mode for Carrying Out the Invention
  • the lithium secondary battery of this embodiment includes a positive electrode 100, a negative electrode 200, a separator 300, and electrolyte (not shown), in brief.
  • a positive electrode material layer 120 including a positive electrode active material 10, a conductive material 20, PTC powder 30 and a binding material 40 is coated and compressed on a positive electrode current collector 110 made of a metal foil such as aluminum.
  • the PTC powder 30 enhances safety of a lithium secondary battery, and it has a relatively good conductivity with a specific resistance of 0.01 to 10 ⁇ -D at a room temperature during a normal operation, and its electric resistance is abruptly increased when a temperature rises.
  • the PTC powder 30 has an average particle diameter corresponding to 5
  • ⁇ 90% of the thickness of the positive electrode material layer 120, and the average diameter of particles is preferably 0.05 to 200D.
  • the particle size is too small, it is difficult to make the PTC powder and its price is increased.
  • the particle size exceeds the above range, a surface flatness of the electrode or the separator is deteriorated when the electrode is coated and also when the positive electrode 100, the separator 300 and the negative electrode 200 are laminated, thereby probably causing a problem in performance of the battery.
  • the particle size exceeding the above range may disturb uniform distribution of active material, thereby probably deteriorating performance of the battery.
  • This PTC powder 30 is composed of powder of crystalline polymer 32 in which a granular conductive filler 31 is dispersed. At this time, the PTC powder includes the crystalline polymer 32 to be 30 to 70 wt% of the PTC powder 30.
  • the PTC powder 30 includes the crystalline polymer 32 and the granular conductive filler 31 at a suitable ratio according to its usage. However, if the crystalline polymer 32 is included at a ratio below the above range, the proportion of the granular conductive filler 31 is increased, thereby causing a problem in manufacturing processes and performance. If the crystalline polymer 32 is included at a ratio above the above range, a resistance of the PTC powder 30 is excessively increased.
  • the crystalline polymer 32 is preferably at least one selected from the group consisting of polyethylene, polypropylene, epoxy resin and PVDF (poly vinyl difluoride), which have a crosslink density of 1 to 70% and the degree of crystallinity of 10 to 80%.
  • the crosslink density and the degree of crystallinity are basic factors for determining features of the PTC powder. If the crosslink density and the degree of crystallinity are below the above range, NTC (Negative Temperature Coefficient) effects are generated at high temperature, contrarily to PTC, thereby causing a problem in safety and stability. If the crosslink density and the degree of crystallinity are over the above range, a problem may be caused in performance when the crystalline polymer and the conductive filler are mixed and when the PTC powder is acted.
  • the crystalline polymer 32 preferably has a melting point of 60 to 180 0 C. This temperature is required for acting the PTC characteristics when the PTC powder 30 is applied to a lithium secondary battery. If the temperature is lower than the above range, the PTC powder 30 can be hardly applied to a lithium secondary battery. On the while, if the temperature is higher than the above range, a problem in safety is caused to the lithium secondary battery since an operation temperature is too high.
  • the crystalline polymer 32 preferably has a heat of fusion of 20 J/g or above. If the heat of fusion is lower than the above range, it is not sufficient to absorb a great amount of heat, instantly generated when a problem occurs in the lithium secondary battery due to overcurrent or overcharging, so it is not suitable as a protective element.
  • the granular conductive filler 31 may use conductive particles such as carbon black, carbon fiber, graphite flake or metal flake. Meanwhile, the granular conductive filler 31 has an average particle diameter of 0.01 to 10OD. If the particle size is too small, it is difficult to make the granular conductive filler 31 and its cost is increased. Meanwhile, the particle size is too great, it is difficult that the granular conductive filler 31 is uniformly dispersed in the crystalline polymer 32.
  • the PTC powder is produced in a manner that a mixture of crystalline polymer, conductive filler and a small amount of additives is prepared and then crosslinked at a high temperature, and then the crosslinked mixture is made into a powder state with a regular particle size.
  • the crystalline polymer 32 when making a mixture composed of the crystalline polymer 32, the conductive filler 31 and a small amount of additives, the crystalline polymer 32 is included to be 30 to 70 wt% of the entire PTC mixture.
  • the mixed PTC material is made into a crosslinked state (or, a coupled state) to endow PTC characteristics and thermal safety at a high temperature thereto.
  • the radiation crosslinking irradiating UV or electronic beams, the water crosslinking using heat and moisture, and the chemical crosslinking adding and reacting chemical material may be used.
  • the crystalline polymer 32 is set to have a crosslink density of 1 to 70% and the degree of crystallinity of 10 to 80%. If the crosslink density is lower than 1%, the NTC phenomenon contrary to the PTC characteristic that increases a resistance at a high temperature is caused, so it is not suitable for acting as a safety element.
  • the PTC mixture crosslinked as mentioned above is made into powder with a constant size by means of cold pulverization, cold ball milling, sol-gel and so on. At this time, the PTC powder is prepared to have an average particle diameter corresponding to 5 to 90% of the thickness of the positive electrode material layer.
  • the positive electrode active material 10 is made of a material capable of occluding and emitting lithium ions during charging or discharging, and generally made of lithium-metal oxide such as LiCoO , LiMn O , LiMnO , LiNiO , LiNi Co O (0 ⁇ x ⁇
  • the conductive material 20 is preferably made of carbon black, and other materials such as metal powder or flake may also be used if they have good conductivity. Meanwhile, the conductive material 20 does not have PTC characteristic, namely a characteristic that an electric resistance is increased as temperature rises, differently from the PTC powder described later. Thus, the conductive material 20 has very small size (e.g., 200 m or less) and very low electric resistance, for example in the order of 10 ( ⁇ -D), regardless of temperature.
  • the binding material 40 is an element for binding the positive electrode active material 10 and the conductive material 20 of the positive electrode material layer 120 with each other, or binding them to the positive electrode current collector 110.
  • the binding material 40 is made of a material such as PVDF (polyvinylidene fluoride).
  • the negative electrode 200 is formed by coating and compressing a negative electrode material layer 220 including a negative electrode active material and a binding material on a negative electrode current collector 210 made of a metal foil such as copper, similar to the positive electrode 100.
  • the negative electrode active material is made of lithium metal or carbon material, which is capable of occluding and emitting lithium ions, and the carbon material is somewhat advantageous in preventing formation of dendrite.
  • the binding material may use PVDF, identically to the binding material of the positive electrode material layer 120.
  • the separator 300 is a film interposed between the positive electrode 100 and the negative electrode 200 in order to prevent a direct contact between them, which causes a short circuit.
  • the separator 300 is made by one layer of polymer film such as polyethylene or polypropylene, or many layers of polymer films laminated with each other.
  • a unit cell composed of the positive electrode, the separator and the negative electrode, or a cell in which such unit cells are laminated with the separator interposed therebetween, is sealed by a package (not shown), and electrolyte (not shown) is injected in the sealed package to form a secondary battery.
  • the electrolyte is an element for mediating movement of materials so that oxidation and deoxidation reactions occurring in the positive electrode 100 and the negative electrode 200 are harmonized.
  • the electrolyte includes organic electrolyte or solid polymer electrolyte that contains lithium salt.
  • LiPF 6 is ad- vantageous to prevent formation of dendrite.
  • the PTC powder 30 is made by dispersing the conductive filler 31 into the crystalline polymer 32, the crystals start being melted as the temperature rises beyond a melting point, thereby abruptly increasing the electric resistance.
  • the conductive filler 31 with a very low electric resistance ensures flow of the electric current, so adding the PTC powder does not deteriorate performance of the battery in the normal operation.
  • the PTC powder 30 may also be included in the negative electrode 200 instead of the positive electrode 100, or in both of the positive electrode 100 and the negative electrode 200, of course.
  • the active material is coated only on one surface of the positive electrode current collector 110 and the negative electrode current collector 210, the active material may be coated on both surfaces thereof, if necessary.
  • the positive electrode 100 is formed as follows.
  • An aluminum foil is prepared as a positive electrode current collector 110, and a positive electrode material layer 120 is formed thereon.
  • the positive electrode material layer 120 the positive electrode active material 10, the conductive material 20, the PTC powder 30 and the binding material 40, which are made of substances already mentioned above, are dispersed and mixed in an organic solvent (e.g., NMP (N-methylpyrrolidone)) to make positive electrode slurry.
  • NMP N-methylpyrrolidone
  • the PTC powder 30 is prepared by dispersing the conductive filler 31 such as carbon black, carbon fiber, graphite flake or metal flake into the crystalline polymer 32 such as polyethylene, and then crosslinking, curing and pulverizing them.
  • the conductive filler 31 such as carbon black, carbon fiber, graphite flake or metal flake
  • the crystalline polymer 32 such as polyethylene
  • the negative electrode 200 is also made by coating, drying and compressing negative electrode slurry, which is prepared by dispersing the negative electrode active material (not shown) and the binding material (not shown) in an organic solvent, on the negative electrode current collector 210 made of copper foil, similarly to the positive electrode 100.
  • the positive electrode 100 and the negative electrode 200 are laminated with the separator 300 being interposed therebetween.
  • the separator 300 is adhered to the positive electrode 100 and the negative electrode 200 by means of adhesive, and this laminating process may be repeated several times to make a battery with larger capacity.
  • the positive electrode, the negative electrode and the separator that are laminated as above are put into a package, which may have various shapes such as a coin shape, a cylindrical shape and a pack shape, and electrolyte is injected into the package. The package is then sealed to make an end cell of a lithium secondary battery with a desired shape.
  • the PTC powder may be contained in the negative electrode as well as in the positive electrode. In this case, what is needed is just adding PTC powder into the negative electrode slurry while the negative electrode slurry is prepared.
  • the PTC material had a crosslink density of 23%.
  • the crosslink density is a value measured by the standard measurement method of ASTM (America Society for Testing and Materials) for the crosslink density, which is internationally used, namely according to ASTM D2765.
  • ASTM America Society for Testing and Materials
  • the crosslinked PTC material was cold-pulverized for 25 minutes by a ball mill under a liquid nitrogen environment into the form of PTC powder.
  • FIG. 2 is a graph showing how an electric resistance of the PTC powder according to the embodiment 1 and the comparative example 1 is changed according to the rise of temperature.
  • an electric resistance is abruptly increased in the temperature range of 100 to 11O 0 C that is a melting point of the crystalline polymer, and the electric resistance is not decreased but increased even in the temperature range of 110 to 15O 0 C beyond the melting point.
  • an electric resistance is abruptly changed in the temperature range of 100 to 11O 0 C identical to the case of the embodiment 1, but the electric resistance is decreased beyond the melting point, which is NTC characteristics.
  • Positive electrode active material (LiCoO ), conductive material (carbon black), binding material (PVDF) and the PTC powder prepared according to the preferred embodiment of the present invention with a particle size of 10 to 5OD, namely with a particle diameter corresponding to 12.5 to 62.5% of the thickness of the positive electrode material layer were dispersed and mixed in NMP (N-methylpyrrolidone) at the ratio of 92:3:3:2 by weight to make positive electrode slurry.
  • NMP N-methylpyrrolidone
  • Positive electrode active material (LiCoO ), conductive material (carbon black), binding material (PVDF) and the PTC powder having a particle size of 100 to 200D, namely having a particle diameter corresponding to 125 to 250% of the thickness of the positive electrode material layer were dispersed and mixed in NMP (N-methylpyrrolidone) at the ratio of 92:3:3:2 by weight to make positive electrode slurry.
  • NMP N-methylpyrrolidone
  • Lithium secondary batteries were manufactured using the positive electrodes prepared according to the embodiment 2 and the comparative example 2, as mentioned above.
  • the surface of the positive electrode was roughly coated since the PTC powder had too great particle size, and the roughly coated area fractured the separator and thus caused an internal short circuit.
  • the PTC powder according to the present invention as described above has characteristics especially suitable for a lithium secondary battery, and it is included in at least one of a positive electrode and a negative electrode and increases a resistance abruptly to block an electric current when the battery is fractured due to overcharging or the like, thereby preventing a further increase of temperature and generation of firing or explosion.
  • the PTC powder facilitates smooth flow of electric current during a normal operation so as to prevent any loss of current and also improve performance of the secondary battery.
  • the lithium secondary battery according to the present invention may be manufactured in a simple manner of adding the PTC powder during the process of making a positive electrode or a negative electrode. Thus, it is possible to manufacture a high-safety, high-performance lithium secondary battery without any difficult in processes.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Dispersion Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

L'invention concerne une poudre PTC, une batterie secondaire au lithium haute sécurité, haute performance comprenant la poudre PTC, et son procédé de fabrication. La poudre PTC se présente sous une forme de poudre polymère cristalline dans laquelle est dispersée une charge conductrice granulaire, la poudre PTC ayant une résistance spécifique de 0,01∩10 Φ cm et un diamètre de particule moyen correspondant à 5-90 % d'une épaisseur de la couche de matériau de l'électrode positive ou de la couche de matériau de l'électrode négative, ladite poudre PTC renfermant le polymère cristallin à raison de 30∩70 % en poids, et le polymère cristallin ayant une densité de réticulation de 1-70 %, un degré de cristallinité de 10-80 %, une température de 60∩126 °C ; 180∩176 °C, et une chaleur de fusion égale ou supérieure à 20J/g. La poudre PTC augmente brusquement sa résistance électrique si la batterie est surchauffée en raison d'une surcharge ou analogue, empêchant ainsi tout accroissement de température susceptible d'occasionner un incendie ou une explosion.
PCT/KR2006/001705 2005-06-04 2006-05-04 Poudre ptc, batterie secondaire au lithium comprenant une poudre ptc et son procede de fabrication WO2006132474A1 (fr)

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CN103333384A (zh) * 2013-05-29 2013-10-02 安徽荣玖光纤通信科技有限公司 一种抗拉伸ptc高分子导电材料及其制备方法
WO2013151046A1 (fr) * 2012-04-04 2013-10-10 古河スカイ株式会社 Collecteur, structure d'électrode, batterie à électrolyte non aqueux et composant de stockage d'électricité
JP2015115168A (ja) * 2013-12-11 2015-06-22 日立化成株式会社 リチウムイオン二次電池用電極及びそれを用いたリチウムイオン二次電池
WO2016129459A1 (fr) * 2015-02-10 2016-08-18 日立化成株式会社 Électrode positive pour batteries secondaires au lithium-ion, électrode pour batteries secondaires au lithium-ion, et batterie secondaire au lithium-ion
CN110140245A (zh) * 2017-01-06 2019-08-16 三井化学株式会社 非水电解质二次电池及其中使用的材料
CN110291669A (zh) * 2017-02-10 2019-09-27 三井化学株式会社 集电体、电极及非水电解质二次电池
JP2020507900A (ja) * 2017-07-28 2020-03-12 エルジー・ケム・リミテッド 二次電池用正極及びこれを含むリチウム二次電池
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JP7048850B2 (ja) 2017-07-28 2022-04-06 エルジー エナジー ソリューション リミテッド 二次電池用正極及びこれを含むリチウム二次電池
US11728522B2 (en) 2018-07-03 2023-08-15 Samsung Sdi Co., Ltd. Electrode for rechargeable lithium battery, and rechargeable lithium battery including the same
US11705585B2 (en) 2018-07-03 2023-07-18 Samsung Sdi Co., Ltd. Rechargeable lithium battery
KR102323950B1 (ko) 2018-12-12 2021-11-08 삼성에스디아이 주식회사 리튬 이차 전지용 전극 및 이를 포함하는 리튬 이차 전지
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US11522183B2 (en) 2019-05-03 2022-12-06 Samsung Sdi Co., Ltd. Rechargeable lithium battery
US11522185B2 (en) 2019-05-03 2022-12-06 Samsung Sdi Co., Ltd. Rechargeable lithium battery
US11515523B2 (en) 2019-05-03 2022-11-29 Samsung Sdi Co., Ltd. Rechargeable lithium battery
US11658287B2 (en) 2019-05-03 2023-05-23 Samsung Sdi Co., Ltd. Rechargeable lithium battery
US11508992B2 (en) 2019-05-03 2022-11-22 Samsung Sdi Co. Ltd. Rechargeable lithium battery
US11710820B2 (en) 2019-05-03 2023-07-25 Samsung Sdi Co., Ltd. Rechargeable lithium battery

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