JP2004087213A - Electrode, manufacturing method of the same, electricity storage device, and light emitting device - Google Patents

Electrode, manufacturing method of the same, electricity storage device, and light emitting device Download PDF

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Publication number
JP2004087213A
JP2004087213A JP2002244501A JP2002244501A JP2004087213A JP 2004087213 A JP2004087213 A JP 2004087213A JP 2002244501 A JP2002244501 A JP 2002244501A JP 2002244501 A JP2002244501 A JP 2002244501A JP 2004087213 A JP2004087213 A JP 2004087213A
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JP
Japan
Prior art keywords
catalyst
electrode
conductor
carbon
carbon nanotubes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002244501A
Other languages
Japanese (ja)
Inventor
Akihiko Emori
Mitsuo Hayashibara
Kishio Hidaka
Junichi Ishii
日▲高▼ 貴志夫
林原 光男
江守 昭彦
石井 潤市
Original Assignee
Hitachi Ltd
株式会社日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd, 株式会社日立製作所 filed Critical Hitachi Ltd
Priority to JP2002244501A priority Critical patent/JP2004087213A/en
Publication of JP2004087213A publication Critical patent/JP2004087213A/en
Pending legal-status Critical Current

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/54Manufacturing of lithium-ion, lead-acid or alkaline secondary batteries

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode utilized for a secondary battery or a light emitting element, to which activator is applied, having a conductor and carbon nanotube or carbon fiber which do not generate electric and mechanical contact disorder, and provide a manufacturing method of the same. <P>SOLUTION: The electrode is constructed by applying catalyst to a plural points on the conductor, evaporating carbon nanotube or carbon fiber on the applied catalyst while applying the catalyst as starting points, and arranging activator or the like between a plurality of carbon nanotubes or the carbon fibers. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electrode, a method for manufacturing an electrode, a capacitor, and a light emitting device.
[0002]
[Prior art]
An electrode of a battery such as a lithium secondary battery is formed by applying an active material or the like to a conductor (current collector). Electrical contact between these active materials or between the active material and the conductor affects the internal resistance of the secondary battery. The internal resistance of the secondary battery has a problem of causing loss of electric energy and deteriorating input / output characteristics. Further, physical contact between the active materials or between the active material and the conductor affects the life of the secondary battery and the utilization rate of the active material. In order to solve such a problem, there has been an electrode in which carbon fibers are added to active materials.
[0003]
FIG. 7 is a diagram showing a conventional electrode. In the figure, 701 is a current collector, 702 is an active material, and 703 is carbon fiber. After carbon fibers 703 are added to the active material 702 and they are mixed, the mixture is applied onto the current collector 701. When the carbon fibers 703 are intricately entangled with each other or with the active material 702, their electrical contact and physical contact are increased. On the other hand, as an electrode of a light emitting element, there is an electrode called a cold cathode type or a field emission type electron emitter. Such an electrode is formed by arranging carbon nanotubes substantially vertically on a conductor.
[0004]
However, in order to use this electrode as a highly efficient light emitting element electrode, it is necessary to make good electrical contact between the conductor and the carbon nanotube, and to make the carbon nanotube stand almost perpendicular to the electrode surface. There is a need.
[0005]
However, it is difficult to arrange carbon nanotubes having a diameter on the order of nanometers in an orderly manner in the axial direction of the tube, and to arrange them while ensuring good electrical contact with the conductor at one end thereof.
[0006]
In order to solve such a problem, conventionally, there has been an electron-emitting device in which carbon nanotubes and particles are mixed and used as an electrode. For example, an electron-emitting device described in Japanese Patent Application Laid-Open No. 2001-319560 has a first particle for emitting electrons into a space and a first particle that is in the vicinity of the first particle and regulates the attitude of the first particle. The electrode member is formed using hybrid particles composed of two particles.
[0007]
[Problems to be solved by the invention]
A conventional electrode of a battery accumulates carbon fibers in an active material, mixes and kneads them, forms a slurry, and then applies the slurry on a current collector.
[0008]
However, according to the electrode, the contact between the conductor and the slurry, and the contact between the active material and the carbon fiber depend on the mixed state of these. For this reason, in the slurry forming process, a long time is required to obtain a sufficiently uniform mixing state, and when this mixing is insufficient, good electrical and mechanical contact cannot be obtained. there were.
[0009]
Further, the conventional electrode of the light emitting element also has a problem that it is not easy to obtain a hybrid state in which the second particles are in the vicinity of the first particles and regulate the attitude of the first particles.
[0010]
The present invention has been made in order to solve the above problems, and an electrode capable of obtaining good electrical and mechanical contact between a conductor and carbon nanotubes or carbon fibers, a method for manufacturing the same, and a capacitor using the same Alternatively, a light-emitting element is provided.
[0011]
[Means for Solving the Problems]
The electrode according to the present invention has a configuration in which a catalyst is applied on a conductor, carbon nanotubes or carbon fibers are vapor-phase grown from the catalyst as a starting point, and active materials are disposed between the carbon nanotubes or the carbon fibers. I do.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the figure, the same reference numerals are given to those having two or more identical parts, and the description is omitted.
[0013]
FIG. 1 is a diagram showing a first embodiment of the present invention. In the figure, 101 is a conductor, 102 is a catalyst, 103 is a carbon nanotube, and 104 is active materials.
[0014]
The conductor 101 is formed by arranging a conductor on a surface of a substrate such as foil such as copper or aluminum or ceramic. The catalyst 102 is composed of fine metal particles such as iron. The carbon nanotube 103 has a six-membered ring of carbon having a tube-like shape, and the diameter of the tube is about several nm. The tube may be of a single layer to a multilayer, and the multilayer may be classified as carbon fiber. The active materials 104 include an active material such as carbon, a metal alloy, lead sulfate, and activated carbon corresponding to each capacitor, a binder for maintaining the form and electrical contact of the active material, and an additive for improving the reaction and conductivity. Agent.
[0015]
The catalyst 102 is applied on the conductor 101, and the carbon nanotubes 103 grow from the catalyst 102. Active materials 104 are provided between the carbon nanotubes 103. An electrode is composed of the conductor 101, the catalyst 102, the carbon nanotube 103, and the active materials 104.
[0016]
One end of the carbon nanotube 103 is in contact with the catalyst 102 and the conductor 101 or only the conductor 101, and good electrical and mechanical contact is obtained. In particular, the carbon nanotube 103 shows metallic characteristics depending on the bonding state of the six-membered ring. When the carbon nanotubes 103 having such metallic characteristics are obtained, extremely good electrical contact can be obtained. Good electrical and mechanical contact can be obtained with the carbon nanotubes 103, the active materials 104, and the conductors 101.
[0017]
Here, the catalyst 102, the carbon nanotubes 103, and the active materials 104 are provided on one surface of the conductor 101, but they may be provided on both surfaces. Although the carbon nanotubes 103 and the active materials 104 are also arranged neatly, they are simply represented for convenience of illustration, and may actually have a more complicated arrangement.
[0018]
FIG. 2 is a diagram showing a second embodiment of the present invention. In the figure, 201 is a negative electrode,
202 is a separator, 203 is a positive electrode, 204 is a housing, 205 is an electrolytic solution, 206 is a negative terminal, and 207 is a positive terminal.
[0019]
A negative electrode 201 and a positive electrode 203 are provided with a separator 202 interposed therebetween, and these are housed in a housing 204. An electrolytic solution 205 is injected into the housing 204, and the negative electrode 201, the separator 202, and the positive electrode 203 are each impregnated with the electrolytic solution 205. A negative terminal 206 extends from the negative electrode 201, and a positive terminal 207 extends from the positive electrode 203 to the outside of the housing 204. These constitute a capacitor, and a load and a power supply are connected to the minus terminal 206 and the plus terminal 207 to charge and discharge the capacitor.
[0020]
As the negative electrode 201 and the positive electrode 203, electrodes as shown in FIG. 1 are used. That is, an electrode is used that can provide good electrical and mechanical contact between the conductor 101 and the carbon nanotubes 103 and the active materials 104. Therefore, it is possible to realize a capacitor having a small loss of internal resistance and electric energy and good input / output characteristics. In addition, a battery with an improved lifespan and an improved utilization rate of the active material can be obtained.
[0021]
It is needless to say that the same effect can be obtained by using a configuration other than that shown in FIG.
[0022]
FIG. 3 is a diagram showing a third embodiment of the present invention. The method for manufacturing an electrode of the present invention is shown in a flow chart. Note that the same reference numerals as in FIG. 1 are used.
[0023]
The application of the catalyst is a step of applying a suspension or a solution of an iron compound, which is obtained by dispersing metal fine particles of iron or the like to be the catalyst 102 in alcohol, on the conductor 101. The conductor 101 and the catalyst 102 after the application are dried if necessary.
[0024]
The vapor phase growth is a process of growing carbon nanotubes 103 or carbon fibers using the catalyst 102 as a nucleus. In this step, the conductor 101 coated with the catalyst 102 and a gas containing hydrocarbon gas as main components are inserted into an electric furnace, and heated at several hundreds to several thousand degrees Celsius. The hydrocarbon gas undergoes benzene ring condensation due to the effect of the catalyst 102, and the carbon nanotubes 103 and carbon fibers grow with the catalyst 102 as a nucleus.
[0025]
The active material application is a step of applying the active material 104 of the battery. The active materials 104 include an active material such as carbon, a metal alloy, lead sulfate, and activated carbon corresponding to each electric storage device, a binder for maintaining the form and electrical contact of the active material, and improving the reaction and conductivity. It is composed of additives and the like.
[0026]
The pressure molding is a step of applying pressure to the electrode after application of the active materials 104, and cutting and molding the electrode into a required shape. The carbon nanotubes 103 and the active materials 104 are brought into close contact with the conductor 101 at a high density by pressing. In addition, the thickness, shape, and the like of the electrode are adjusted to prepare for a later step. This step can be omitted depending on the type and configuration of the battery.
[0027]
As described above, according to the present invention, the carbon nanotubes 103 can be directly grown on the conductor 101 by a simple method, and the electrical and mechanical interaction between the conductor and the carbon nanotubes or carbon fibers and active materials can be achieved. Good contact can be realized.
[0028]
FIG. 4 is a diagram showing a fourth embodiment of the present invention. Reference numeral 401 denotes a spacer, 402 denotes a vacuum layer, 403 denotes a phosphor film, 404 denotes a second conductor, 405 denotes a housing, and 406 denotes a power supply.
[0029]
A carbon nanotube 103 having a catalyst 102 as a nucleus is disposed on a conductor 101, and a space between the carbon nanotubes 103 is filled with a spacer 401 to form a light emitting element electrode (cathode). On the other hand, the positive electrode has a structure in which a phosphor film 403 is laid on the vacuum layer 402 side of the second conductor. Then, a positive electrode and a negative electrode are mounted in a light-transmitting case 405 made of glass or the like via a vacuum layer 402 to constitute a light-emitting element.
[0030]
When a power supply 406 is connected to the electrodes and a voltage is applied as shown in FIG. 4, electrons are emitted from the end face of the carbon nanotube 103 on the vacuum layer 402 side, and the electrons are attracted to the positive electrode to emit light.
[0031]
According to the present invention, since good electrical contact between the conductor 101 at one end of the carbon nanotube 103 and the spacer 401 and the conductor 101 can be secured at one end of the carbon nanotube 103, loss of electric energy is small and energy efficiency and energy efficiency are improved. A light-emitting element electrode and a light-emitting element with high luminous efficiency can be realized.
[0032]
Here, the carbon nanotubes 103 and the spacers 401 are arranged in an orderly manner, but are simply represented for convenience of illustration, and actually have a more complicated arrangement.
[0033]
FIG. 5 is a view showing a fifth embodiment of the present invention. A method for manufacturing a light emitting element electrode is shown in a flowchart.
[0034]
The application of the catalyst is a step of applying a suspension or a solution of an iron compound, which is obtained by dispersing metal fine particles of iron or the like to be the catalyst 102 in alcohol, on the conductor 101. The conductor 101 and the catalyst 102 after the application are dried if necessary.
[0035]
The vapor phase growth is a process of growing carbon nanotubes 103 or carbon fibers using the catalyst 102 as a nucleus. In this step, the conductor 101 coated with the catalyst 102 and a gas containing hydrocarbon gas as main components are inserted into an electric furnace, and heated at several hundreds to several thousand degrees Celsius. The hydrocarbon gas undergoes benzene ring condensation due to the effect of the catalyst 102, and the carbon nanotubes 103 and carbon fibers grow with the catalyst 102 as a nucleus.
[0036]
The spacer disposition is a step of disposing a conductor, a resin, or the like as a spacer between the carbon nanotubes 103. The conductor can be provided by electroplating or vacuum evaporation. According to the present invention, since the carbon nanotubes 103 are provided on the conductor 101, they are suitable for electroplating and vacuum deposition. When a resin is used, the carbon nanotube 103 is impregnated with the resin and dried.
[0037]
The cutting and etching is a step of cutting or etching the surface of the spacer to expose one end of the carbon nanotube 103, that is, an electron emission port to the surface of the spacer.
[0038]
The molding is a step of preparing the shape of the electrode into an arbitrary shape in preparation for a subsequent step.
[0039]
As described above, according to the present invention, the carbon nanotubes 103 can be directly grown on the conductor 101 by a simple method, and good electrical and mechanical contact between the conductor and the carbon nanotubes can be realized. In addition, in the electrode and the light-emitting element of the light-emitting element to which the present invention is applied, reduction in electric energy loss, high energy efficiency, and high light emission efficiency can be achieved.
[0040]
FIG. 6 is a diagram showing a sixth embodiment of the present invention. In the figure, 601 is a catalyst particle, and 602 is a binder resin. The catalyst particles 601 are made of fine particles of metal such as iron, and serve as nuclei when carbon nanotubes and carbon fibers grow in a vapor phase. The binder resin 602 is made of a polyester resin, a vinyl resin, an epoxy resin, or a mixed resin thereof. Then, the binder resin 602 includes the catalyst particles 601 to form toner particles.
[0041]
The toner particles are applied on a conductor by electrophotography or electrostatic printing. According to this, coating can be realized by a simple method such as so-called copying or printing. Further, a copy machine or a personal computer can be used, and a complicated coating pattern can be created on the personal computer.
[0042]
【The invention's effect】
According to the present invention, good electrical and mechanical contact between the conductor and the carbon nanotube or carbon fiber can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic view of an electrode showing a first embodiment of the present invention.
FIG. 2 is a schematic diagram of a battery according to a second embodiment of the present invention.
FIG. 3 is a flowchart illustrating a method for manufacturing an electrode according to a third embodiment of the present invention.
FIG. 4 is a schematic diagram of an electrode showing a fourth embodiment of the present invention.
FIG. 5 is a flowchart illustrating a method for manufacturing an electrode according to a fifth embodiment of the present invention.
FIG. 6 is a schematic diagram of toner particles showing a sixth embodiment of the present invention.
FIG. 7 is a schematic view showing a conventional electrode.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 101 ... Conductor, 102 ... Catalyst, 103 ... Carbon nanotube, 104 ... Active materials, 201 ... Negative electrode, 202 ... Separator, 203 ... Positive electrode, 204, 405 ... Casing, 205 ... Electrolyte, 206 ... Negative terminal, 207 ... Plus terminal, 401 spacer, 402 vacuum layer, 403 phosphor film, 404 second conductor, 406 power supply, 601 catalyst particles, 602 binder resin, 701 current collector, 702 Active material, 703: carbon fiber.

Claims (7)

  1. An electric conductor, a catalyst applied to a plurality of locations on the electric conductor, carbon nanotubes or carbon fibers that are vapor-phase grown from the catalyst as starting points, and an active material between the carbon nanotubes or the carbon fibers. An electrode characterized by being provided.
  2. A step of applying a catalyst on a conductor, a step of vapor-growing carbon nanotubes or carbon fibers starting from the catalyst, and a step of disposing active materials between the carbon nanotubes or the carbon fibers. Method for manufacturing an electrode.
  3. A conductor, a catalyst applied to a plurality of locations on the conductor, a carbon nanotube or a carbon fiber which was vapor-grown from the catalyst as a starting point, and a spacer disposed between the carbon nanotube or the carbon fiber. An electrode, characterized in that:
  4. A step of applying a catalyst on a conductor, a step of growing carbon nanotubes or carbon fibers from the catalyst as a starting point, and a step of disposing a spacer on the conductor and between the carbon nanotubes or the carbon fibers. A method for producing an electrode, comprising:
  5. 5. The method according to claim 2, wherein the catalyst forms toner particles contained in a binder resin, and the step of applying the catalyst on the conductor is performed by electrophotography or electrostatic printing. 3. The method for producing an electrode according to item 1.
  6. A battery comprising the electrode according to claim 1.
  7. A light emitting device using the electrode according to claim 3.
JP2002244501A 2002-08-26 2002-08-26 Electrode, manufacturing method of the same, electricity storage device, and light emitting device Pending JP2004087213A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006004814A (en) * 2004-06-18 2006-01-05 Ishikawajima Harima Heavy Ind Co Ltd Collector and collector manufacturing method
JP2006069165A (en) * 2004-09-06 2006-03-16 Daiken Kagaku Kogyo Kk Carbon nanotube composite sheet and its production method
JP2006179431A (en) * 2004-12-24 2006-07-06 Matsushita Electric Ind Co Ltd Current collector, compound current collector containing carbon nanofiber jointed to surface of the current collector, and manufacturing method of the same
JP2006261399A (en) * 2005-03-17 2006-09-28 Ricoh Elemex Corp Accumulation device
JP2007019180A (en) * 2005-07-06 2007-01-25 Chubu Electric Power Co Inc Electric double layer capacitor and method of manufacturing same
JP2007035811A (en) * 2005-07-26 2007-02-08 Hitachi Zosen Corp Electrode using carbon nanotube and its manufacturing method
JP2008103118A (en) * 2006-10-17 2008-05-01 Nissan Motor Co Ltd Electrode for battery
WO2011058417A1 (en) 2009-11-11 2011-05-19 Toyota Jidosha Kabushiki Kaisha Positive electrode for lithium secondary battery, method for preparing the positive electrode, lithium secondary battery having the positive electrode, and vehicle having the lithium secondary battery
US8298841B2 (en) 2009-09-02 2012-10-30 Hon Hai Precision Industry Co., Ltd. Method for manufacturing light emitting diode package
WO2012153613A1 (en) * 2011-05-11 2012-11-15 ソニー株式会社 Secondary battery, method for producing secondary battery, secondary battery positive electrode, method for producing secondary battery positive electrode, battery pack, battery device, electric vehicle, power system, and power source for power storage
JP2014038798A (en) * 2012-08-20 2014-02-27 Ulvac Japan Ltd Negative electrode structure of lithium ion secondary battery, and method of manufacturing the same

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006004814A (en) * 2004-06-18 2006-01-05 Ishikawajima Harima Heavy Ind Co Ltd Collector and collector manufacturing method
JP2006069165A (en) * 2004-09-06 2006-03-16 Daiken Kagaku Kogyo Kk Carbon nanotube composite sheet and its production method
JP2006179431A (en) * 2004-12-24 2006-07-06 Matsushita Electric Ind Co Ltd Current collector, compound current collector containing carbon nanofiber jointed to surface of the current collector, and manufacturing method of the same
JP2006261399A (en) * 2005-03-17 2006-09-28 Ricoh Elemex Corp Accumulation device
JP2007019180A (en) * 2005-07-06 2007-01-25 Chubu Electric Power Co Inc Electric double layer capacitor and method of manufacturing same
JP2007035811A (en) * 2005-07-26 2007-02-08 Hitachi Zosen Corp Electrode using carbon nanotube and its manufacturing method
JP4696751B2 (en) * 2005-07-26 2011-06-08 日立造船株式会社 Method for producing electrode using carbon nanotube
JP2008103118A (en) * 2006-10-17 2008-05-01 Nissan Motor Co Ltd Electrode for battery
US8298841B2 (en) 2009-09-02 2012-10-30 Hon Hai Precision Industry Co., Ltd. Method for manufacturing light emitting diode package
WO2011058417A1 (en) 2009-11-11 2011-05-19 Toyota Jidosha Kabushiki Kaisha Positive electrode for lithium secondary battery, method for preparing the positive electrode, lithium secondary battery having the positive electrode, and vehicle having the lithium secondary battery
CN102668181A (en) * 2009-11-11 2012-09-12 丰田自动车株式会社 Positive electrode for lithium secondary battery, method for preparing the positive electrode, lithium secondary battery having the positive electrode, and vehicle having the lithium secondary battery
WO2012153613A1 (en) * 2011-05-11 2012-11-15 ソニー株式会社 Secondary battery, method for producing secondary battery, secondary battery positive electrode, method for producing secondary battery positive electrode, battery pack, battery device, electric vehicle, power system, and power source for power storage
CN103534842A (en) * 2011-05-11 2014-01-22 索尼公司 Secondary battery, method for producing secondary battery, secondary battery positive electrode, method for producing secondary battery positive electrode, battery pack, battery device, electric vehicle, power system, and power source for power stora
JP2014038798A (en) * 2012-08-20 2014-02-27 Ulvac Japan Ltd Negative electrode structure of lithium ion secondary battery, and method of manufacturing the same

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