CN101381080B - Method for directly preparing carbon nanotube composite conductive agent - Google Patents
Method for directly preparing carbon nanotube composite conductive agent Download PDFInfo
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- CN101381080B CN101381080B CN2008102135258A CN200810213525A CN101381080B CN 101381080 B CN101381080 B CN 101381080B CN 2008102135258 A CN2008102135258 A CN 2008102135258A CN 200810213525 A CN200810213525 A CN 200810213525A CN 101381080 B CN101381080 B CN 101381080B
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- carbon nanotube
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- nanotube composite
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Abstract
The invention discloses a method for directly manufacturing a carbon nanotube composite conductive agent. The method comprises the following steps: first, uniformly mixing a catalyst and conductive carbon particles used for preparing the carbon nanotubes; then using the mixture as a catalyst and producing a primary product of containing a carbon nanotube composite conductive agent as well as the catalyst by a chemical gas-phrase precipitation method; at last, removing active ingredients and a carrier of the catalyst from the primary product containing the carbon nanotube composite conductive agent with a diluted acid and/or diluted base, separating, washing and neutralizing the carbon nanotube composite conductive agent and drying the carbon nanotube composite conductive agent by a spray drying method or the prior method of filtering first and then drying to obtain the carbon nanotube composite conductive agent. The method avoids the use of an ultrasonic dispersion device in the preparation of a composite of a carbon nanotube and carbon particles, and is suitable for mass production of carbon nanotube composite conductive agent.
Description
Technical field
The present invention relates to the preparation method of a kind of lithium ion battery, belong to field of inorganic nano-material preparation, be specially adapted to adopt catalytic chemical vapor deposition technique to prepare carbon nanotube with carbon nanotube composite conductive agent.
Background technology
Carbon nanotube with filamentary structure has remarkable advantages as the static eliminator of lithium ion battery: its percent crystallinity is high, has excellent conducting performance; Length-to-diameter ratio is big, and diameter is in nanometer scale, and length helps in electrode, forming effective conductive network in micron dimension, and can the fixed electorde active material and with the combining of electrode slice, play the effect of physical binder; Specific surface area is big, has vesicular structure, is easy to absorb hold electrolytic solution, for electrode reaction provides the buffering lithium ion source.The particulate state static eliminator like acetylene black, SuperP and Graphite Powder 99, have less specific surface area and less pore structure, but the point of contact between the particle is more than fibrous static eliminator.Research shows; Fibrous carbon nanotube and the compound use of granular static eliminator, effectively brought into play the many advantages of reticulated structure and particulate state carbon point of contact of carbon nanotube: the reticulated structure of carbon nanotube helps reducing the consumption of static eliminator in the lithium ion cell electrode and does not influence the conductivity of electrode; The use of particulate state static eliminator has guaranteed itself and fully the contacting of electrode active material and carbon nanotube, and makes that the conductive network in the electrode is more flourishing and complete.In addition, particulate state carbon and carbon nanotube are after evenly compound, and carbon nanotube is scattered among the Nanoparticulate carbon, and the reunion of carbon nanotube is stoped effectively, helps the dispersion once more of carbon nanotube.The use of low price Nanoparticulate carbon has also reduced the carbon nanotube consumption, has reduced cost.
Chinese invention patent (application number 200510021505.7) has been reported the preparation method of this combined conductive agent; Promptly under the effect of macromolecule dispersing agent; At first carbon nanotube is dispersed in water or the organic solvent; In finely dispersed carbon nano tube suspension, add a certain amount of particulate state static eliminator then, mix the back and separate water outlet or organic solvent, obtain carbon nanotube composite conductive agent.The weak point of this method is at first to prepare abundant dispersed carbon nano tube suspension-s.Owing to reunite with twine each other, carbon nanotube is difficult to disperse, and under dispersion agent, use ultrasonic dispersing usually, but owing to reasons such as the restriction of ultrasonic equipment power and noise, this technological very difficult realization large-scale industrialization production.
Summary of the invention
The invention provides a kind of direct method for preparing carbon nanotube composite conductive agent; Avoided the difficulty that adopts the ultrasonic technology dispersing Nano carbon tubes to face; Carbon nanotube composite conductive agent that can low-cost mass preparation excellent property is convenient to applying of carbon nanotube composite conductive agent.
The object of the invention is achieved through following principle: start with from the source of carbon nanotube production, adopt growth in situ method technology to realize.Promptly through a certain amount of particulate state carbon of uniform mixing in the catalyzer of preparation carbon nanotube; Adopt chemical Vapor deposition process to prepare carbon nanotube again; Isolate the catalyzer of preparation carbon nanotube, can obtain the even compound carbon nanotube composite conductive agent of carbon nanotube and particulate state carbon.
Particulate state carbon of the present invention is lithium ion battery industries such as carbon black, acetylene black, SuperP, superfine graphite static eliminators commonly used, and SuperP conductive carbon black is the leading product of static eliminator at present.
The catalyzer of the preparation carbon nanotube that the present invention adopts is an active ingredient with Fe, Co, Ni or its binary, ternary complex mainly, with MgO, SiO
2, La
2O
3, Al
2O
3Deng the oxide compound that is soluble in acid solution or alkaline solution is carrier, is prepared into powder catalyst through pickling process or gel combustion synthesis method.
When the preparation carbon nanotube composite conductive agent; At first powder catalyst and particulate state carbon are pre-mixed under mechanical force evenly; With this mixture as catalyst; The process that fully prepares carbon nanotube according to catalytic chemical vapor deposition technique makes the carbon nanotube and the mixture head product of particulate state carbon of band catalyzer, and head product is removed activity of such catalysts component and carrier with acid solution or alkaline solution, the acquisition carbon nanotube composite conductive agent.
The used acid of the present invention is hydrochloric acid, nitric acid, sulfuric acid or hydrofluoric acid, and used alkali is sodium hydroxide and Pottasium Hydroxide.
Slurry attitude carbon nanotube composite conductive agent behind the removal catalyst component adopts spray drying process directly to prepare combined conductive agent, perhaps uses conventional methods oven dry and makes the finished product.
The combined conductive agent of the present invention preparation can be used as lead-sour battery, zinc-air battery, nickel-metallic hydrogen battery and lithium ion secondary battery positive electrode, cathode conductive agent, can also be as the conductive filler material of coating, macromolecular material and as the strengthening agent of rubber.
Description of drawings
Fig. 1 is the carbon nanotube of the present invention's preparation and the stereoscan photograph of Super P mixture; Magnification is 20,000 times, shows that carbon nanotube and Super P mix at the nanometer level equably; Formed homodisperse mixture, the diameter of carbon nanotube is in 30～80nm scope.
Fig. 2 is the stereoscan photograph of the CNTs of chemical Vapor deposition process preparation, and magnification is 30,000 times, shows that carbon nanotube twines each other, reunites together, and the carbon nanotube diameter is in 30～80nm scope.
Embodiment:
Embodiment one
Take by weighing LaNiO
3Catalyzer 2 gram, Super P20 gram adopt impeller that both are mixed and make catalyzer, with the CH of 80L per hour
4/ H
2(volume ratio 40/100) gas mixture is made virgin gas; In fixed-bed reactor, 700 ℃ were reacted 1 hour, made the carbon nanotube and Super P mixture head product 34 grams that contain catalyzer; Head product with 2N hydrochloric acid 1000mL 60 ℃ of following purifying 6 hours; Cooled and filtered, washing get carbon nanotube composite conductive agent 32 grams to neutral behind the filtration cakes torrefaction, the weight ratio that calculates carbon nanotube and SuperP is 3:5.The SEM photo of sample is seen Fig. 1.
Embodiment two
Take by weighing Co content and be 9% Co/MgO catalyzer 2 grams, acetylene black 20 grams, adopt impeller that both are mixed and makes catalyzer, with the CH of 80L per hour
4/ H
2(volume ratio 40/100) gas mixture is made virgin gas; In fixed-bed reactor, 650 ℃ were reacted 1 hour, made the carbon nanotube and acetylene black mixture head product 30 grams that contain catalyzer; Head product with 2N hydrochloric acid 1000mL 60 ℃ of following purifying 6 hours; Cooled and filtered, washing get carbon nanotube composite conductive agent 28 grams to neutral behind the filtration cakes torrefaction, the weight ratio that calculates carbon nanotube and acetylene black is 2:5.
Comparative Examples
Take by weighing LaNiO
3Catalyzer 2 gram is with the CH of 80L per hour
4/ H
2(volume ratio 40/100) gas mixture is made virgin gas, and in fixed-bed reactor, 700 ℃ were reacted 1 hour; Make carbon nanotube head product 12 grams that contain catalyzer; 60 ℃ of following purifying 6 hours, cooled and filtered, washing be to neutral with 2N hydrochloric acid 200mL, behind the filtration cakes torrefaction carbon nanotube 10 grams.The SEM photo of sample is seen Fig. 2.
Claims (7)
1. a method that directly prepares carbon nanotube composite conductive agent is characterized in that adopting the growth in situ method directly to prepare carbon nanotube composite conductive agent, may further comprise the steps:
The catalyzer and the particulate state carbon that (1) will prepare carbon nanotube mix according to certain part by weight, fully disperse to process original mixture;
(2) be catalyzer with resulting original mixture, adopt chemical Vapor deposition process to prepare carbon nanotube, obtain carbon nanotubes combined conductive agent head product;
(3) adopt diluted acid and/or diluted alkaline to handle carbon nanotubes combined conductive agent head product, remove activity of such catalysts component and carrier, washing carbon nanotubes combined conductive agent is to neutral, and drying makes carbon nanotube composite conductive agent.
2. the method for preparing carbon nanotube composite conductive agent according to claim 1 is characterized in that particulate state carbon is carbon black or superfine graphite.
3. the method for preparing carbon nanotube composite conductive agent according to claim 1 is characterized in that particulate state carbon is Super P or acetylene black.
4. the method for preparing carbon nanotube composite conductive agent according to claim 1, the catalyzer that it is characterized in that preparing carbon nanotube is an active ingredient with Fe, Co, Ni or its binary, ternary complex, MgO, La
2O
3, SiO
2Perhaps Al
2O
3Be carrier.
5. the method for preparing carbon nanotube composite conductive agent according to claim 1, the weight ratio that it is characterized in that catalyzer and particulate state carbon is 1～10: 50.
6. the method for preparing carbon nanotube composite conductive agent according to claim 1 is characterized in that adopting spraying drying or oven drying to make carbon nanotube composite conductive agent.
7. the method for preparing carbon nanotube composite conductive agent according to claim 1 is characterized in that diluted acid is hydrochloric acid, nitric acid, sulfuric acid or hydrofluoric acid, and diluted alkaline is sodium hydroxide or Pottasium Hydroxide.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102135258A CN101381080B (en) | 2007-09-05 | 2008-09-05 | Method for directly preparing carbon nanotube composite conductive agent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710049934 | 2007-09-05 | ||
| CN200710049934.4 | 2007-09-05 | ||
| CN2008102135258A CN101381080B (en) | 2007-09-05 | 2008-09-05 | Method for directly preparing carbon nanotube composite conductive agent |
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| CN101381080A CN101381080A (en) | 2009-03-11 |
| CN101381080B true CN101381080B (en) | 2012-10-31 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101944620B (en) * | 2010-08-02 | 2012-10-31 | 北京交通大学 | Fuel cell catalyst taking multi-element compound as carrier and preparation method thereof |
| CN102263288A (en) * | 2011-06-29 | 2011-11-30 | 上海空间电源研究所 | High-power lithium ion storage battery and manufacturing method thereof |
| JP6028189B2 (en) | 2011-09-30 | 2016-11-16 | 三菱マテリアル株式会社 | A method for producing carbon nanofibers containing metallic cobalt. |
| WO2014039509A2 (en) | 2012-09-04 | 2014-03-13 | Ocv Intellectual Capital, Llc | Dispersion of carbon enhanced reinforcement fibers in aqueous or non-aqueous media |
| CN105070941A (en) * | 2015-07-29 | 2015-11-18 | 东莞市金辉电源科技有限公司 | Lithium ion battery slurry with long service life and preparation method of lithium ion battery slurry |
| CN106744819B (en) * | 2016-12-19 | 2019-06-28 | 西北大学 | A kind of minute yardstick carbon nano-tube material and preparation method thereof |
Citations (4)
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|---|---|---|---|---|
| US6495258B1 (en) * | 2000-09-20 | 2002-12-17 | Auburn University | Structures with high number density of carbon nanotubes and 3-dimensional distribution |
| CN1588679A (en) * | 2004-08-09 | 2005-03-02 | 深圳市纳米港有限公司 | Lithium ion secondary cell positive pole material and its preparing method |
| CN1770515A (en) * | 2005-08-22 | 2006-05-10 | 中国科学院成都有机化学有限公司 | Anode, cathode material conductive agent for lithium-ion secondary battery and preparation method thereof |
| CN1789120A (en) * | 2004-12-14 | 2006-06-21 | 中国科学院物理研究所 | Carbon wool ball material and its preparation method and uses |
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2008
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6495258B1 (en) * | 2000-09-20 | 2002-12-17 | Auburn University | Structures with high number density of carbon nanotubes and 3-dimensional distribution |
| CN1588679A (en) * | 2004-08-09 | 2005-03-02 | 深圳市纳米港有限公司 | Lithium ion secondary cell positive pole material and its preparing method |
| CN1789120A (en) * | 2004-12-14 | 2006-06-21 | 中国科学院物理研究所 | Carbon wool ball material and its preparation method and uses |
| CN1770515A (en) * | 2005-08-22 | 2006-05-10 | 中国科学院成都有机化学有限公司 | Anode, cathode material conductive agent for lithium-ion secondary battery and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| Y.Zhang et al.Composite anode material of silicon/graphite/carbon nanotubes for Li-ion batteries.《Electrochimica Acta》.2006,第51卷4994-5000. * |
| 刘露等.导电剂对锂离子电池性能的影响.《材料导报》.2007,第21卷267-269. * |
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