WO2014084611A1 - 복합체 및 이를 포함하는 음극 슬러리의 제조방법 - Google Patents
복합체 및 이를 포함하는 음극 슬러리의 제조방법 Download PDFInfo
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- WO2014084611A1 WO2014084611A1 PCT/KR2013/010867 KR2013010867W WO2014084611A1 WO 2014084611 A1 WO2014084611 A1 WO 2014084611A1 KR 2013010867 W KR2013010867 W KR 2013010867W WO 2014084611 A1 WO2014084611 A1 WO 2014084611A1
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- Prior art keywords
- negative electrode
- composite
- group
- carbon
- conductive material
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Classifications
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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
- 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
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
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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
- 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
- H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
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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
- 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
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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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
- 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
- H01M4/625—Carbon or graphite
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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
- 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
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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
Definitions
- the present invention relates to a composite and a method for producing a negative electrode slurry comprising the same.
- Lithium-based secondary batteries have been put to practical use as small, light-weight, high-capacitance rechargeable batteries, and are used in portable electronic devices such as small video cameras, mobile phones, laptops, and communication devices.
- Lithium secondary batteries are energy storage devices having high energy and power, and have an advantage of higher capacity and operating voltage than other batteries.
- a high energy is a problem of the safety of the battery has a risk of explosion or fire.
- such a hybrid car that is in the spotlight because the high energy and output characteristics are required such safety can be seen more important.
- a lithium secondary battery is composed of a positive electrode, a negative electrode, and an electrolyte, and transfers energy by reciprocating both electrodes such that lithium ions from the positive electrode active material are inserted into the negative electrode active material, ie, carbon particles, and are detached again during discharge by the first charge. Since it plays a role, it becomes possible to charge and discharge.
- high-capacity negative electrode materials such as Sn and Si, which have a much higher capacity per unit weight than carbon, which is used as a conventional negative electrode material, have been actively studied.
- Si or Si alloy is used as the negative electrode active material, there is a problem that the volume expansion becomes large and the cycle characteristics deteriorate.
- it is used as the negative electrode active material by mixing with graphite, but when mixed with graphite, the graphite is unevenly distributed. There is a problem that the cycle performance and life is reduced.
- the present invention provides a composite included in the negative electrode active material and a method for producing a negative electrode slurry including the same.
- the present invention provides a composite comprising a (semi) metal oxide, a conductive material and a binder on the (semi) metal oxide surface.
- the present invention provides a method for producing a negative electrode slurry comprising dispersing a conductive material in an aqueous binder and mixing with a (quasi) metal oxide to produce a composite, and mixing the composite with a carbonaceous material and a non-aqueous binder. do.
- the conductive material may be dispersed in an aqueous binder and then mixed with the (quasi) metal oxide, thereby improving electrical conductivity and improving the performance of the secondary battery, particularly the life characteristics.
- the present invention provides a composite comprising a (semi) metal oxide, a conductive material and a binder on the (semi) metal oxide surface.
- the composite according to an embodiment of the present invention may improve electrical conductivity by dispersing a conductive material in an aqueous binder and then mixing the (quasi) metal oxide, and may improve the performance of the secondary battery, particularly the life characteristics of the secondary battery. have.
- Composite according to an embodiment of the present invention is economical by using an aqueous binder as the binder material of the negative electrode, it is possible to increase the ratio of the (quasi) metal oxide in the negative electrode can be increased in capacity.
- the binder is specifically an aqueous binder, wherein the binder is selected from the group consisting of styrene-butadiene rubber, acrylonitrile-butadiene rubber, acrylonitrile-butadiene-styrene rubber, carboxymethylcellulose and hydroxypropylmethylcellulose. It may include more than one species.
- the (quasi) metal oxide is SiO x , AlO x , SnO x , SbO x , BiO x , AsO x , GeO x , PbO x , ZnO x , CdO x , InO It may include one or more selected from the group consisting of x , TiO x and GaO x (where 0 ⁇ x ⁇ 2), and the (quasi) metal oxide may be silicon monoxide.
- the conductive material may be selected from the group consisting of carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black and summer black; Conductive fibers selected from the group consisting of carbon fibers and metal fibers; Metal powder selected from the group consisting of carbon fluoride, aluminum and nickel powders; Conductive whiskers selected from the group consisting of zinc oxide and potassium titanate; Conductive metal oxides of titanium oxide; And it may include one or more selected from the group consisting of polyphenylene derivatives.
- the conductive material is dispersed on the surface of the (quasi) metal oxide, the electrical conductivity may be greatly improved by itself. Furthermore, when the negative electrode active material is mixed with the carbon material, the conductive material of the (quasi) metal oxide together with the electrical conductivity of the carbon material may further improve the electrical conductivity, thereby improving the performance of the secondary battery. You can.
- the present invention provides a method for producing a negative electrode slurry comprising dispersing a conductive material in an aqueous binder and mixing with a (quasi) metal oxide to produce a composite, and mixing the composite with a carbonaceous material and a non-aqueous binder. do.
- the manufacturing method of the negative electrode slurry according to an embodiment of the present invention comprises the step of preparing a composite by dispersing the conductive material in the aqueous binder and then mixed with the (quasi) metal oxide.
- Dispersion of the conductive material in the aqueous binder may be performed by mechanical stirring or ultrasonic waves.
- the mechanical agitation can make two or more materials having different physical or chemical properties into a uniform mixed state by using external mechanical energy, and ultrasonic waves can be mainly used to mix or disperse heterogeneous materials that are difficult to mix with each other.
- the conductive material may be used when dispersed in the aqueous binder, but is not limited thereto, as long as the conductive material may be uniformly mixed with the aqueous binder.
- the conductive material may be included in an amount of 1 to 20 parts by weight, preferably 1 to 10 parts by weight, based on the total weight of the aqueous binder.
- the conductive material is less than 1 part by weight, the content of the conductive material is so low that it is difficult to realize the effect of the use of the conductive material, when the conductive material is more than 20 parts by weight dispersion of the conductive material may not be made well and the excess conductive material Due to this, the adhesion at the electrode may be lowered.
- the composite may be prepared by spray drying by mixing an aqueous binder and a (quasi) metal oxide in which a conductive material is dispersed.
- the spray drying method may substantially remove moisture to form granular powder.
- the spray drying (spray drying) method is connected to a drying chamber in which the spray drying method is substantially performed, and a hot air injection pipe for supplying hot air into the drying chamber to remove the dispersion medium, and connected to the drying chamber.
- Powder recovery tubes for recovering the powders formed by the spray drying in may be made, but is not limited thereto.
- Method for producing a negative electrode slurry comprises the step of mixing the composite with a carbonaceous material and a non-aqueous binder.
- the carbonaceous material is one selected from the group consisting of soft carbon, hard carbon, natural graphite, artificial graphite, kish graphite, pyrolytic carbon, liquid crystal pitch-based carbon fiber, carbon microspheres, liquid crystal pitch, petroleum coke and coal coke. It may contain the above.
- the carbonaceous material may be included in 20 to 80 parts by weight based on the total weight of the composite.
- the use of the composite that selectively imparts electrical conductivity by dispersing the conductive material in the (quasi) metal oxide may be insignificant.
- the non-aqueous binder may include at least one selected from the group consisting of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, and polypropylene. Can be.
- PTFE polytetrafluoroethylene
- PVdF polyvinylidene fluoride
- PVpyrrolidone polyvinylpyrrolidone
- tetrafluoroethylene polyethylene
- polypropylene polypropylene.
- a conductive material may be further included in the process of mixing the composite with a carbonaceous material and a non-aqueous binder.
- the conductive material may be carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, or summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskers such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; And it may include one or more selected from the group consisting of polyphenylene derivatives.
- the present invention also provides a negative electrode active material in which a composite including a (semi) metal oxide and a conductive material and a binder on the (semi) metal oxide surface is dispersed in a carbonaceous material.
- the composite according to the embodiment of the present invention may be dispersed in the carbonaceous material when the negative electrode active material is mixed with the carbonaceous material.
- the carbonaceous material may be particulate.
- the present invention is a positive electrode comprising a positive electrode active material; Separator; A negative electrode including a negative electrode active material in which a composite including a (semi) metal oxide and a conductive material and a binder on a surface of the (semi) metal oxide is dispersed in a carbonaceous material; And it provides a secondary battery comprising an electrolyte.
- Secondary battery according to an embodiment of the present invention by including the composite of the present invention as a negative electrode active material, it is possible to improve the electrical conductivity of the secondary battery, it is possible to improve the performance of the secondary battery.
- the negative electrode is prepared by, for example, applying a mixture of a negative electrode active material, a conductive material, and a binder on a negative electrode current collector, followed by drying, and further, a filler may be further added as necessary.
- the positive electrode may also be manufactured by coating and drying a positive electrode active material on a positive electrode current collector.
- the separator is interposed between the cathode and the anode, and an insulating thin film having high ion permeability and mechanical strength is used.
- an insulating thin film having high ion permeability and mechanical strength is used.
- a secondary battery is completed by forming a battery current collector through a separator between a positive electrode and a negative electrode, winding or folding the battery current collector into a cylindrical battery case or a rectangular battery case, and then injecting an electrolyte.
- the secondary battery is completed by stacking the battery current collector in a bi-cell structure, impregnating it in an electrolyte, and sealing the resultant in a pouch.
- styrene-butadiene rubber To 0.1 g of styrene-butadiene rubber, 5 parts by weight of carbon black based on the total weight of the styrene-butadiene rubber was dispersed by mechanical stirring, and then mixed with 5 g of silicon monoxide to prepare a composite by spray drying. In this case, the styrene-butadiene rubber prevents carbon black from falling off the surface of silicon monoxide.
- Example 1 The composite prepared in Example 1 was mixed with natural graphite, carbon black, and polytetrafluoroethylene in a weight ratio of 40: 55: 2: 3 to prepare a negative electrode slurry.
- Example 2 a negative electrode slurry was prepared in the same manner as in Example 2, except that commercially available silicon monoxide was used.
- the negative electrode slurry prepared in Example 2 was coated with a thickness of 65 ⁇ m on one surface of a copper current collector, dried and rolled, and then punched to a predetermined size to prepare a negative electrode.
- LiPF 6 was added to a nonaqueous electrolyte solvent prepared by mixing ethylene carbonate and diethyl carbonate in a volume ratio of 30:70 to prepare a 1 M LiPF 6 nonaqueous electrolyte.
- a lithium metal foil was used as a counter electrode, and a coin-type secondary battery was manufactured by interposing a polyolefin separator between both electrodes and injecting the electrolyte solution.
- a secondary battery was manufactured in the same manner as in Example 3, except that the negative electrode slurry prepared in Comparative Example 1 was used.
- the secondary batteries prepared in Example 3 and Comparative Example 2 were subjected to constant current / constant voltage at 23 ° C. After charging at 0.1 m to 5 mV and 0.005 C under (CC / CV) conditions, and then discharged at 0.1 C to 1.5 V under constant current (CC) conditions, the capacity was measured.
- the present invention can be usefully applied to the secondary battery field because the conductive material is dispersed in the aqueous binder and then mixed with the (quasi) metal oxide, thereby improving the electrical conductivity and improving the performance of the secondary battery, especially the life characteristics. have.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
예 | 용량(mAh/g) | 수명 특성(%) |
실시예 3 | 716 | 95.8 |
비교예 2 | 723 | 83.7 |
Claims (15)
- (준)금속 산화물, 상기 (준)금속 산화물 표면에 전도성 물질 및 바인더를 포함하는 복합체.
- 청구항 1에 있어서,상기 (준)금속 산화물은 SiOx, AlOx, SnOx, SbOx, BiOx, AsOx, GeOx, PbOx, ZnOx, CdOx, InOx, TiOx 및 GaOx (이때, 0<x<2) 로 이루어진 군에서 선택되는 1종 이상을 포함하는 것을 특징으로 하는 복합체.
- 청구항 1에 있어서,상기 전도성 물질은 카본블랙, 아세틸렌 블랙, 케첸 블랙, 채널 블랙, 퍼네이스 블랙, 램프 블랙 및 서머 블랙로 이루어진 군으로부터 선택된 카본블랙; 탄소 섬유 및 금속 섬유로 이루어진 군으로부터 선택된 도전성 섬유; 불화 카본, 알루미늄 및 니켈 분말로 이루어진 군으로부터 선택된 금속 분말; 산화아연 및 티탄산 칼륨으로 이루어진 군으로부터 선택된 도전성 위스커; 산화 티탄의 도전성 금속 산화물; 및 폴리페닐렌 유도체로 이루어진 군으로부터 선택되는 1종 이상을 포함하는 것을 특징으로 하는 복합체.
- 청구항 1에 있어서,상기 바인더는 수계 바인더인 것을 특징으로 하는 복합체.
- 청구항 1에 있어서,상기 바인더는 스티렌-부타디엔 고무, 아크릴로니트릴-부타디엔 고무, 아크릴로니트릴-부타디엔-스티렌 고무, 카르복시메틸셀룰로오스 및 하이드록시프로필메틸셀룰로오스로 이루어진 군으로부터 선택되는 1종 이상을 포함하는 것을 특징으로 하는 복합체.
- 전도성 물질을 수계 바인더에 분산시킨 후 (준)금속 산화물과 혼합하여 복합체를 제조하고,상기 복합체를 탄소재 물질 및 비수계 바인더와 혼합하는 것을 포함하는 음극 슬러리의 제조방법.
- 청구항 6에 있어서,상기 전도성 물질은 상기 수계 바인더 총 중량에 대해 1 중량부 내지 20 중량부로 포함되는 것을 특징으로 하는 음극 슬러리의 제조방법.
- 청구항 6에 있어서,상기 복합체의 제조는 스프레이 드라이법에 의해 수행되는 것을 특징으로 하는 음극 슬러리의 제조방법.
- 청구항 6에 있어서,상기 탄소재 물질은 연화탄소, 경화탄소, 천연 흑연, 인조 흑연, 키시흑연, 열분해 탄소, 액정 피치계 탄소섬유, 탄소 미소구체, 액정피치, 석유계 코크스 및 석탄계 코크스로 이루어진 군으로부터 선택되는 1종 이상을 포함하는 것을 특징으로 하는 음극 슬러리의 제조방법.
- 청구항 6에 있어서,상기 탄소재 물질은 상기 복합체 총 중량에 대해 20 중량부 내지 80 중량부로 포함되는 것을 특징으로 하는 음극 슬러리의 제조방법.
- 청구항 6에 있어서,상기 비수계 바인더는 폴리테트라플루오로에틸렌(PTFE), 폴리비닐리덴플루오라이드(PVdF), 폴리비닐피롤리돈, 테트라플루오로에틸렌, 폴리에틸렌 및 폴리프로필렌으로 이루어진 군으로부터 선택되는 1종 이상을 포함하는 것을 특징으로 하는 음극 슬러리의 제조방법.
- 청구항 6에 있어서,상기 복합체를 탄소재 물질 및 비수계 바인더와 혼합할 시 도전재를 더 포함하는 것을 특징으로 하는 음극 슬러리의 제조방법.
- 청구항 1의 복합체가 탄소재 물질에 분산된 음극 활물질.
- 청구항 13에 있어서,상기 탄소재 물질은 입자상인 것을 특징으로 하는 음극 활물질.
- 양극 활물질을 포함하는 양극; 분리막; 청구항 13의 음극 활물질을 포함하는 음극; 및 전해질을 포함하는 이차전지.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2014550228A JP6080178B2 (ja) | 2012-11-30 | 2013-11-27 | 複合体及びこれを含む負極スラリーの製造方法 |
EP13834318.1A EP2760065B1 (en) | 2012-11-30 | 2013-11-27 | Method for manufacturing an anode slurry |
BR112014007896A BR112014007896B8 (pt) | 2012-11-30 | 2013-11-27 | Método de preparação de lama anódica |
CN201380003432.1A CN104185913B (zh) | 2012-11-30 | 2013-11-27 | 复合材料和制备包含其的负极浆料的方法 |
US14/166,934 US9806335B2 (en) | 2012-11-30 | 2014-01-29 | Composite including conductive material and binder on surface of (semi) metal oxide and method of preparing anode slurry including the same |
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KR10-2012-0138528 | 2012-11-30 | ||
KR20120138528 | 2012-11-30 | ||
KR10-2013-0144588 | 2013-11-26 | ||
KR1020130144588A KR101622808B1 (ko) | 2012-11-30 | 2013-11-26 | 복합체 및 이를 포함하는 음극 슬러리의 제조방법 |
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US14/166,934 Continuation US9806335B2 (en) | 2012-11-30 | 2014-01-29 | Composite including conductive material and binder on surface of (semi) metal oxide and method of preparing anode slurry including the same |
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JP4519592B2 (ja) * | 2004-09-24 | 2010-08-04 | 株式会社東芝 | 非水電解質二次電池用負極活物質及び非水電解質二次電池 |
CN100449826C (zh) * | 2005-11-23 | 2009-01-07 | 比亚迪股份有限公司 | 锌负极二次电池和该电池的锌负极及它们的制备方法 |
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CA2773496C (en) * | 2009-09-23 | 2015-03-03 | Umicore | New silicon based electrode formulations for lithium-ion batteries and method for obtaining it |
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2013
- 2013-11-27 WO PCT/KR2013/010867 patent/WO2014084611A1/ko active Application Filing
- 2013-11-27 EP EP13834318.1A patent/EP2760065B1/en active Active
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JP2005135925A (ja) * | 2002-02-07 | 2005-05-26 | Hitachi Maxell Ltd | 電極材料およびその製造方法、並びに非水二次電池およびその製造方法 |
US20040253517A1 (en) * | 2003-01-29 | 2004-12-16 | Young-Jun Kim | Method of preparing a negative electrode for a rechargeable lithium battery, method of fabricating a rechargeable lithium battery, and a rechargeable lithium battery |
US20110068294A1 (en) * | 2008-02-28 | 2011-03-24 | Showa Denko K.K. | Composite electrode material |
KR20100109483A (ko) * | 2009-03-30 | 2010-10-08 | 주식회사 엘지화학 | 전극활물질용 복합체 및 이를 포함하는 이차 전지 |
US20110165464A1 (en) * | 2010-01-05 | 2011-07-07 | Samsung Sdi Co., Ltd. | Negative Electrode for Rechargeable Lithium Battery and Rechargeable Lithium Battery Including Same |
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EP2760065A4 (en) | 2014-12-31 |
EP2760065A1 (en) | 2014-07-30 |
EP2760065B1 (en) | 2018-06-13 |
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