WO2015016642A1 - 도전재 조성물, 이를 사용한 리튬 이차 전지의 전극 형성용 슬러리 조성물 및 리튬 이차 전지 - Google Patents
도전재 조성물, 이를 사용한 리튬 이차 전지의 전극 형성용 슬러리 조성물 및 리튬 이차 전지 Download PDFInfo
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- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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- C08G2261/30—Monomer units or repeat units incorporating structural elements in the main chain
- C08G2261/31—Monomer units or repeat units incorporating structural elements in the main chain incorporating aromatic structural elements in the main chain
- C08G2261/314—Condensed aromatic systems, e.g. perylene, anthracene or pyrene
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- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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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 enables the provision of an electrode containing a higher content of carbon nano-rubber uniformly dispersed, conductive material composition that can provide a battery, such as a lithium secondary battery having more improved electrical and life characteristics, It relates to a slurry composition for forming an electrode of a lithium secondary battery using the same and a lithium secondary battery.
- electrical characteristics such as electrical conductivity, carbon black, which has been previously applied as a conductive material for electrodes, is used as a one-dimensional fiber structure.
- electrical characteristics such as electrical conductivity, carbon black, which has been previously applied as a conductive material for electrodes
- carbon nanotubes Alternative use of carbon nanotubes has been investigated and attempted.
- the carbon nano-lube not only exhibits excellent electrical conductivity and thermal conductivity, but also maintains an effective conductive structure as a conductive material in the form of fiber, and thus is most popular as a new conductive material that replaces existing materials. I am getting it.
- the present invention enables the provision of an electrode containing a higher content of carbon nanotubes in a uniformly dispersed state, the conductive material composition to provide a battery such as a lithium secondary battery having more improved electrical and life characteristics and It is providing the slurry composition for electrode formation of the lithium secondary battery using this.
- the present invention also provides a lithium secondary battery exhibiting more improved properties, including an electrode formed from the slurry composition for electrode formation. [Measures of problem]
- the present invention is a carbon nanotube; And comprising the poly-aromatic hydrocarbons, oxides of a plurality of kinds, molecular weight 300 to 1000 of the replicon aromatic hydrocarbon oxide 60 parts by weight 0 /, which provides a conductive material composition containing a dispersing agent containing the above content.
- the conductive material composition may include carbon nanotube powder and a dispersant present on the surface of the carbon nanotube powder.
- the oxygen content may be 12 to 50 weight 0 / ° of the total element content of the dispersant.
- the polyaromatic hydrocarbon oxide may have a structure in which one or more oxygen-containing functional groups are bonded to an aromatic hydrocarbon including 5 to 30, black and 7 to 20 benzene rings, and the oxygen-containing functional group is a hydroxy group. It may include one or more selected from the group consisting of an epoxy group, a carboxyl group, a nitro group and a sulfone group.
- the conductive material composition based on 100 parts by weight of the carbon nanotubes, about 1 to 50 parts by weight of the dispersant, black may include about 5 to 30 parts by weight.
- the conductive material composition may be used for forming an electrode of a battery, and more specifically, may be included in an electrode slurry composition of a lithium secondary battery.
- the present invention is an electrode active material, the above-described conductive material composition, binder and It provides a slurry composition for forming an electrode of a lithium secondary battery containing a solvent.
- the electrode active material may comprise a positive electrode active material or a negative electrode active material
- the binder is vinylidene fluoride / nucleus fluoropropylene copolymer ⁇ polyvinylidene fluoride, polyacrylonitrile polymethylmethacrylate, poly It may comprise one or more selected from the group consisting of acrylates, polytetrafluoroethylene, poly (styrene-butadiene) copolymers, alginates and polydopamines
- the solvent may be water, N-methylpyridone, acetone, tetra It may include one or more selected from the group consisting of hydrofuran and decane.
- the slurry composition may include 70 to 98 parts by weight of the electrode active material, 0.1 to 15 parts by weight of the conductive material composition, and 1 part of the binder, based on 100 parts by weight of the total content of solid content of the electrode active material, the conductive material composition, and the binder. It may comprise from 0 to 20 parts by weight.
- the present invention includes a negative electrode including a current collector, a negative electrode active material, a conductive material and a binder and a negative electrode active material layer formed on the current collector;
- a positive electrode comprising a current collector and a positive electrode active material layer including a positive electrode active material, a conductive material, and a binder and formed on the current collector;
- an electrolyte, and at least one of the negative electrode active material layer or the conductive material included in the positive electrode active material layer provides a lithium secondary battery including the conductive material composition described above.
- This lithium secondary battery has a higher concentration of carbon nanotubes
- an electrode formed from a powdery conductive material composition or the like contained in a uniformly dispersed form a higher content of carbon nanotubes may be included in the electrode in a uniformly dispersed state. Therefore, since the lithium secondary battery can be expressed by maximizing the performance improvement due to the high content of carbon nano-rubber, it may exhibit more excellent capacity characteristics, electrical characteristics, and life characteristics.
- a novel dispersant capable of uniformly dispersing a high content of carbon nanolouves even in a powder state, and a conductive material composition containing the same.
- a powdery conductive material composition and a slurry composition for forming an electrode including the same it is possible to provide an electrode including a carbon nanotube having a higher content uniformly.
- the present invention can greatly contribute to realizing high capacity characteristics of various batteries such as lithium secondary batteries.
- 1 a and 1 b (expanded view of the molecular weight 400 to 500 region) is a diagram showing the molecular weight distribution of the pitch analyzed by MALDI-TOF mass spectrum.
- 2A and 2B (enlarged view of the molecular weight 400 to 500 region) is a diagram showing the molecular weight distribution of the dispersant obtained in Example 1 analyzed by MALCM-TOF mass spectrum.
- 3 is a diagram showing a result of analyzing the pitch and the dispersant of Example 1 by 13C CPMAS NMR, respectively.
- 5 is a diagram showing the molecular weight distribution of the dispersant obtained in Examples 2 to 4 by MALCH-TOF mass spectrum, and comparing the analysis results.
- 6A and 6B are diagrams showing the distribution of carbon nanotubes in the conductive material composition dispersed on the surface of the active material (Graphite) when the electrode composition slurry composition and the electrode were formed in Example 9 by SEM analysis and confirmation; . 7A and D show the conductive material composition of Example 5, the slurry composition for forming an electrode of Example 9, an electrode (anode or negative electrode) and a lithium secondary battery in Test Example 2 using the dispersant of Example 1
- the graph shows the electrical characteristics of each electrode compared with the case where a lithium secondary battery was formed without using a tertiary dispersant.
- dispenser means to uniformly disperse other components, such as carbon nanotubes, in an aqueous solvent, an organic solvent, or a liquid medium. May refer to any ingredient.
- conductive material composition may refer to any composition that can be used as a conductive material in a composition for forming an electrode of a battery such as a lithium secondary battery.
- any composition that can be added as a conductive material to any electrode forming composition may belong to the category of "conductor composition”.
- conductor composition any composition that can be added as a conductive material to any electrode forming composition may belong to the category of "conductor composition”.
- polyaromatic hydrocarbon means two or more aromatic rings, for example, benzene rings, in a single compound structure, or
- polyaromatic hydrocarbon oxide may refer to any compound in which the above-mentioned “polyaromatic hydrocarbon” reacts with an oxidizing agent and has one or more oxygen-containing functional groups bonded thereto.
- the oxygen-containing functional group that can be introduced into the "polyaromatic hydrocarbon" by reaction with the oxidizing agent may be bonded to an aromatic ring such as a hydroxyl group, an epoxy group, a carboxyl group, a nitro group or a sulfone group and includes one or more oxygen in the functional group. It can be any functional group.
- carbon nanotubes comprising the poly-aromatic hydrocarbons, oxides of a plurality of kinds, molecular weight 300 to 1000 of a poly-aromatic hydrocarbons to oxide 60 parts by weight 0 /. It is provided with a conductive material composition containing a dispersing agent containing the above content.
- the conductive material composition of one embodiment is a predetermined poly with carbon nanotubes And a dispersant including a mixture of aromatic hydrocarbon oxides.
- a dispersant including a mixture of aromatic hydrocarbon oxides.
- the powdery carbon nanotubes can be more uniformly dispersed by the action of this specific dispersant.
- a conductive material composition in which powdery carbon nanotubes are uniformly dispersed may be provided even without using a separate liquid medium, and a higher content of carbon nanotubes may be applied to a slurry composition for forming an electrode and an electrode using the conductive material composition. It was confirmed that it can be included in a uniformly dispersed state.
- the dispersant may more uniformly disperse the carbon nanotubes due to the properties of the dispersant described later.
- Pitch discharged from wastes during the refining of fossil fuels such as petroleum or coal is a by-product used for asphalt production, etc., and has a viscous complex form containing a plurality of polyaromatic hydrocarbons having a plurality of aromatic rings. I can stand.
- the specific kind, structure, and distribution of the polyaromatic hydrocarbon oxides included in such a mixture may vary depending on the kind of pitch used as the raw material, its origin, or the kind of oxidizing agent.
- the mixture of the polyaromatic hydrocarbon oxides included in the dispersant is 5 to 30, 7 to 20 black polyaromatic hydrocarbons each having a structure in which at least one oxygen-containing functional group is introduced into the polyaromatic hydrocarbons
- the polyaromatic hydrocarbon oxide in such a mixture has a molecular weight distribution such that the above-described molecular weight distribution, that is, an oxide having a molecular weight of about 300 to 1000, or about 300 to 700, is about 60% by weight or more of the total mixture. do.
- the type of the oxygen-containing functional group may vary depending on the type of oxidizing agent used in the oxidation process such as pitch, etc., for example, at least one selected from the group consisting of hydroxy group, epoxy group, carboxyl group, nitro group and sulfone group. And typically polyaromatic hydrocarbon oxides having various functional groups in the mixture.
- Polyaromatic hydrocarbon oxides stratifying the above-described structural characteristics and molecular weight distribution, and their mixtures are hydrophobic ⁇ ⁇ It may have a domain and a hydrophilic region by oxygen-containing functional groups bonded to the aromatic ring and the like.
- hydrophobic ⁇ -domains can interact with ⁇ - ⁇ with surfaces such as carbon nanotubes on which carbon-carbon bonds are formed, and hydrophilic regions can allow repulsive force to be expressed between each single carbon nanotube.
- the dispersant comprising the mixture of polyaromatic hydrocarbon oxides may be present between each powder or particle of the carbon nanotubes to more uniformly disperse these carbon nanotubes.
- the dispersant may be adsorbed on the powder surface of the carbon nanotubes by the aforementioned ⁇ - ⁇ interaction. Therefore, the conductive material composition of the embodiment including the specific dispersing agent described above may include the powdery carbon nanotubes in a more uniformly dispersed state.
- the conductive material composition may be used to uniformly disperse the carbon nanotubes having a higher content in the slurry composition for forming the electrode and the electrode, the electrode exhibiting improved electrical characteristics, and excellent capacity characteristics and lifetime It can contribute greatly to provision of batteries, such as a lithium secondary battery which shows a characteristic etc.
- the dispersant included in the conductive material composition of the embodiment can be prepared from a raw material such as a low-cost pitch through a simplified oxidation process, it can be easily obtained at a low manufacturing cost. Only by using such a dispersant, an electrode, a battery, and the like exhibiting excellent characteristics can be provided, which makes it easier to achieve high capacity and high efficiency of the battery.
- a conductive material composition containing fibrous carbon such as carbon nanotubes and a polymer dispersant having a pyrene or quinacridone skeleton has been known (Korean Patent Publication No. 2010-0095473).
- the polymer dispersing agent and the conductive material composition including the same are difficult to be provided in a powder state, and in particular, it is difficult to uniformly disperse carbon nanotubes and the like in a high content in such a powder state.
- the dispersant included in the conductive material composition of the embodiment has a state of a mixture of polyaromatic hydrocarbon oxides having a range of various molecular weights and various oxygen-containing functional groups, and the like, without the need to introduce a separate functional group, Carbon nanotubes may be uniformly dispersed with respect to a solvent or a medium, and a conductive material composition including a higher content of carbon nanotubes in a uniformly dispersed state may be more easily manufactured and provided.
- the dispersant included in the composition of the embodiment can evenly disperse a high content of carbon nanotubes in a powder state, so that it can be easily used to provide an electrode and a battery containing a higher content of carbon nanotubes. It becomes possible.
- the conductive material composition of one embodiment is described for each component as follows.
- the carbon nanotubes any type of carbon nanotubes known to be usable for various electrode compositions may be used.
- a single wall carbon nanotube or a multi wall carbon nanotube may be used without any restriction, and an aspect ratio of about 100 to 1000 may be used.
- Carbon nanotubes having (length / diameter) can be used.
- the specific surface area of the carbon nanotubes may vary depending on the diameter or aspect ratio of the carbon nanotubes, and the amount of the dispersant for uniformly dispersing the carbon nanotubes in the conductive material composition varies depending on the specific surface area of the carbon nanotubes. I can regulate it.
- the oxygen content of the total dispersant is about 12 to 50 weight 0 of the total element content. / 0 , or about 15 to 45 weight 0 /.
- the oxygen content reflects the degree to which oxygen-containing functional groups are introduced by the oxidation process in the polyaromatic hydrocarbon oxide, and the hydrophilic region described above may be included to an appropriate degree according to the layer of oxygen content.
- the above-mentioned dispersing agent can be used to more suitably disperse the carbon nano-lives.
- the oxygen content may be calculated by elemental analysis of a plurality of polyaromatic hydrocarbon oxides included in the mixture described above. That is, the mixture sample (for example, about 1 mg), for example, about 900 ° C on a thin foil When heated to a high temperature, the foil may instantly melt and its temperature may rise to about 1500 to 1800 ° C., and gas may be generated from the complex sample due to the high temperature to collect and analyze and analyze the element content. . As a result of this elemental analysis, the total elemental content of carbon, oxygen, hydrogen, and nitrogen contained in the polyaromatic hydrocarbon oxides of the plurality may be measured and analyzed, and the oxygen content may be obtained for the total elemental content.
- the dispersant included in the conductive material composition of the above-described embodiment may be prepared by a method including oxidizing a mixture including polyaromatic hydrocarbons having a molecular weight of 200 to 1500 in the presence of an oxidizing agent.
- oxidizing a mixture including polyaromatic hydrocarbons having a molecular weight of 200 to 1500 in the presence of an oxidizing agent.
- the pitch discharged from the remnants and the like during the refining process of fossil fuels such as petroleum or coal may take the form of a viscous complex containing a plurality of polyaromatic hydrocarbons.
- the specific type, structure, composition ratio or molecular weight distribution of the polyaromatic hydrocarbon may vary depending on the raw material or the origin of the pitch, the pitch may be, for example, 5 to 50 aromatic rings, for example, a benzene ring. It may include a plurality of polyaromatic hydrocarbons contained in the structure, and may generally include polyaromatic hydrocarbons having a molecular weight of 200 to 1500. For example, a common compound containing a molecular weight of 200 to 1500.
- Poly-aromatic hydrocarbons to be used as a starting material in the production method of the dispersing agent is a poly-aromatic hydrocarbons such molecular weight of from about 80 weight 0/0 or more Or about 90% by weight or more It may be included in the content.
- polyaromatic hydrocarbons having an excessively large molecular weight are decomposed in the polyaromatic hydrocarbons included in the pitch, and a relatively narrow molecular weight distribution is obtained.
- Mixtures of polyaromatic hydrocarbons having can be obtained.
- polyaromatic hydrocarbons having molecular weights greater than about 1000 or about 700 can be broken down to small molecular weights.
- At least one oxygen-containing functional group is introduced into the aromatic ring of each polyaromatic hydrocarbon, a mixture containing a plurality of polyaromatic hydrocarbon oxides, that is, the dispersant described above can be produced very simply.
- the oxidizing agent can be used without any particular limitation as long as the kind thereof is not particularly limited and can cause oxidation reaction to introduce oxygen-containing functional groups to aromatic hydrocarbons.
- Specific examples of such oxidizing agents include nitric acid (HN0 3 ), sulfuric acid (H 2 SO 4 ), hydrogen peroxide (H 2 O 2 ), ammonium cerium (IV) sulfate; (NH 4 ) 4 Ce ( SO 4 ) 4 ) or ammonium cerium (IV) nitrate (Ammonium cerium (IV) nitrate; (NH 4 ) 2 Ce (N0 3 ) 6 ), and the like.
- HN0 3 sulfuric acid
- H 2 SO 4 hydrogen peroxide
- NH 4 ) 4 Ce ( SO 4 ) 4 ) or ammonium cerium (IV) nitrate Ammonium cerium (IV) nitrate
- this oxidation step can be carried out in the solvent, for about 0.5 to 20 hours under a reaction temperature of about 10 to 90 ° C.
- a solution phase oxidant such as sulfuric acid and / or nitric acid
- the polyaromatic A certain amount of the mixture including the hydrocarbons may be added, and the oxidation step may be performed at room temperature, for example, at about 2 (rc or 80 ° C. for about 1 to 12 hours.
- the properties of the above-described dispersant for example, the degree of oxidation of the polyaromatic hydrocarbons, etc. can be appropriately adjusted to prepare a dispersant having desired properties.
- the mixture including polyaromatic hydrocarbons having a molecular weight of 200 to 1500 as starting materials of the production method may be derived from a pitch obtained from a fossil fuel or a product thereof.
- the type, structure or molecular weight distribution of the polyaromatic hydrocarbons may be different. Nevertheless, as the oxidation process is performed on the mixture including 3 ⁇ 4-aromatic hydrocarbons having a molecular weight of 200 to 1500 derived from the above pitch, the above-described dispersant exhibiting excellent dispersibility for the carbon-based material can be prepared simply.
- the above-described manufacturing method after the oxidation step, may further comprise the step of purifying the resultant to obtain a mixture of a plurality of polyaromatic hydrocarbon oxides
- the purification step is a step of centrifuging the result of the oxidation step It may proceed to include.
- the conductive material composition of one embodiment containing the above-described dispersant and the like Powdery or particulate carbon nanotubes and dispersants present on the surface of such carbon nanotube powders or particles.
- the dispersant is adsorbed on each carbon nano-lube powder by ⁇ - ⁇ interaction or the like, and the powdery carbon nanotubes may be uniformly dispersed through such ⁇ - ⁇ interaction and repulsive force.
- the slurry composition and the electrode may be obtained by mixing the powdery conductive material composition in which the carbon nanotubes are uniformly dispersed without other liquid medium with other components of the slurry composition for forming an electrode, which will be described later. Thereby, it becomes possible to manufacture the electrode composition slurry composition and electrode which the uniformity disperse
- the conductive material composition of the embodiment may include about 5 to 30 parts by weight, black about 10 to 20 parts by weight, black about 15 to 30 parts by weight based on 100 parts by weight of the carbon nanotubes. have. According to the content range of the dispersant, it is possible to uniformly disperse the carbon nanotubes having various surface areas.
- the conductive material composition of one embodiment described above may be used for forming electrodes of various batteries, and may be included in, for example, an electrode slurry composition of a lithium secondary battery and used for forming an electrode such as a positive electrode or a negative electrode of a lithium secondary battery. .
- a slurry composition for forming an electrode of a lithium secondary battery including the conductive material composition described above.
- the composition may include an electrode active material, the conductive material composition of the above-described embodiment, a binder, and a solvent.
- the slurry composition for forming an electrode may be prepared by mixing the aforementioned powdery conductive material composition with other components such as an active material, a binder, and a solvent.
- the powder of carbon nanotubes is obtained using a conductive material composition that is uniformly dispersed in itself, it may include a carbon nanotube conductive material that is uniformly dispersed in a high concentration and a higher content of carbon nanotubes It is possible to obtain an electrode including in a uniformly dispersed state.
- the slurry composition of the other embodiment may be in accordance with the composition and preparation method of a slurry composition for forming an electrode of a conventional lithium secondary battery, except for using the conductive material composition of the embodiment.
- the slurry composition may include an electrode active material of a positive electrode active material or a negative electrode active material
- the positive electrode active material may be a metal oxide, lithium composite metal oxide, or lithium composite metal capable of intercalating / deintercalating lithium. Sulfides or lithium complex metal nitrides may be used.
- a negative electrode active material lithium metal or a lithium alloy; Any lithium or alloy thereof known to be usable as a negative electrode active material of a lithium secondary battery, such as coke, artificial alum, natural alum, combustible organic polymer compound, carbon fiber, Si, SiO Xl Sn or SnO 2 , or carbon-based Or silicon-based materials and the like can be used without any limitation.
- the binder is vinylidene fluoride / nucleofluoropropylene 1 type selected from the group consisting of copolymer, polyvinylidene fluoride, polyacrylonitrile, polymethyl methacrylate, polyacrylate, polytetrafluoroethylene, poly (styrene-butadiene) copolymer, alginate and polydopamine Resin containing the above or a mixture thereof can be used.
- the solvent may be one solvent selected from the group consisting of water, N-methylpyridone, acetone, tetrahydrofuran, and decane, or two or more mixed solvents.
- the slurry composition of another embodiment described above is about 70 to 98 parts by weight of the electrode active material, and 100 parts by weight of the total amount of solids of the electrode active material, the conductive material composition and the binder, excluding the solvent, About 0.1 to 15 parts by weight, and about 1.0 to 20 parts by weight of the binder.
- the slurry composition may include the conductive material including the carbon nanotubes as a high content of about 10 parts by weight relative to the total solids, as the slurry composition includes the above-described conductive material composition. It is possible to keep the tube evenly dispersed in high concentration. Therefore, using such a slurry composition, it is possible to produce an electrode and a battery containing the carbon nanotubes in a uniformly dispersed state in a high content, and exhibiting more excellent electrical properties and the like.
- a lithium secondary battery obtained by using the above-described conductive material composition and the slurry composition for electrode formation.
- a lithium secondary battery includes a negative electrode including a current collector, a negative electrode active material, a conductive material and a binder, and a negative electrode active material layer formed on the current collector;
- a positive electrode comprising a current collector and a positive electrode active material layer including a positive electrode active material, a conductive material, and a binder and formed on the current collector;
- an electrolyte, and at least one of the negative electrode active material layer or the conductive material included in the positive electrode active material layer may include the conductive material composition of the above-described embodiment.
- Such a lithium secondary battery may be included in a state in which a higher content of carbon nanotubes is uniformly dispersed as a conductive material on the electrode. Therefore, the electrical characteristics of the electrode itself can be further improved, and by maximizing the advantages of using carbon nanotubes as a conductive material, a battery such as a lithium secondary battery exhibiting improved electrical characteristics, capacity characteristics, and lifetime characteristics can be provided. Will be. As a result, the present invention can greatly contribute to realizing high capacity characteristics of various batteries such as lithium secondary batteries.
- the lithium secondary battery uses a conductive material composition of one embodiment as a conductive material, it may be according to the configuration of a conventional lithium secondary battery, further description thereof will be omitted.
- the operation and effects of the invention will be described in more detail with reference to specific embodiments of the invention. However, these embodiments are only presented as an example of the invention, whereby the scope of the invention is not determined.
- the dispersant of Example 1 was prepared by performing the following oxidation process and purification process on pitch, a petroleum by-product obtained from POSCO.
- the pitch was found to include polyaromatic hydrocarbons having a molecular weight of 200 to 1500, particularly a large peak at 14Da intervals in the enlarged view of FIG. Having different numbers of aromatic rings (benzene rings) It was confirmed that a plurality of polyaromatic hydrocarbons are linked by aliphatic hydrocarbons. In contrast, referring to FIGS. 1A and 1B (enlarged view), the pitch was found to include polyaromatic hydrocarbons having a molecular weight of 200 to 1500, particularly a large peak at 14Da intervals in the enlarged view of FIG. Having different numbers of aromatic rings (benzene rings) It was confirmed that a plurality of polyaromatic hydrocarbons are linked by aliphatic hydrocarbons. In contrast, referring to FIGS.
- the large peaks in the dispersing agent of Example 1 are present in the polyaromatic hydrocarbons at intervals of 44 Da and 16 D, respectively, which are represented by -COOH or It is proved that oxygen-containing functional groups such as -OH exist in the form of a mixture of introduced polyaromatic hydrocarbon oxides, and oxides having a molecular weight of about 300 to 1000 and black to about 300 to 700 are contained in 60% by weight or more. It became.
- the pitch (top) used as the raw material and the dispersant (bottom) of Example 1 were analyzed by 13C CPMAS NMR (Varian 400MHz Solid-State NMR), respectively, and the results of the analysis were compared with FIG. 3.
- the carbon-derived peak of the aromatic hydrocarbon and the carbon-derived peak of some aliphatic hydrocarbon were confirmed, but the presence of the oxygen-containing functional group was not confirmed.
- the peak of the oxygen-containing functional group was confirmed. It was confirmed that such oxygen-containing functional groups were epoxy groups, hydroxyl groups, carboxyl groups, and the like.
- Example 2 which is a petroleum by-product obtained from POSCO, except using a pitch of a sample different from Example 1, the reaction reaction time was 1 hour (Example 2), 3.5 hours (Example 3) and 7
- the dispersing agents of Examples 2 to 4 were prepared in the same manner as in Example 1, except that the time of Example 4 was changed.
- This dispersant was analyzed by MALDI-TOF mass spectrum in the same manner as in Example 1, and compared with FIG. 5.
- a component polyaromatic hydrocarbon oxide having a molecular weight of about 1000 or more than about 700 in the dispersant decreases, and thus, a polyaromatic having a molecular weight of about 300 to 1000 or about 300 to 700. It was found that a dispersant in the form of a mixture containing a higher content of hydrocarbon oxides was obtained.
- SiO Absorption and carbon coated SiO as a negative electrode active material
- SBR as a binder (styrene-butadiene rubber), CMC (carboxym ethyl cellulose) is used as a thickener
- the conductive material composition of Examples 5 to 8 is used, and the weight ratio thereof is by far: SiO: SBR: CMC: conductive material composition
- the slurry composition for electrode formation was manufactured by mixing this 90: 5: 2: 2: 1.
- the slurry composition was used to coat a thickness of 65 um on one surface of a copper current collector, dried and rolled, and then biased to a required size to prepare a negative electrode. Using this negative electrode, a positive electrode and a lithium secondary battery including the same were prepared in a conventional manner.
- Example 9 In the slurry composition of Example 9 using the conductive material composition of Example 5, the distribution of carbon nanotubes in the conductive material composition dispersed on the surface of the active material (Graphite) was analyzed and confirmed by SEM and shown in FIGS. 6A and 6B, respectively. . 6A and 6B, it was confirmed that a high content of carbon nanotubes was included in a more uniformly dispersed state.
- Test Example 2 Evaluation of Characteristics of Lithium Secondary Battery
- Example 9 The lifespan characteristics and high rate characteristics of the lithium secondary battery prepared in Example 9 were evaluated, together with the electrode and the lithium secondary battery of the comparative example prepared using powdery carbon nano-Lube instead of the conductive material composition of Example 5 by the same method 7A and 7B.
- the lithium secondary battery prepared in Examples exhibits better life characteristics and high rate characteristics.
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Abstract
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EP14831291.1A EP3002808B1 (en) | 2013-08-01 | 2014-07-31 | Conductor composition, slurry composition for forming electrode of lithium secondary battery using same, and lithium secondary battery |
JP2016523677A JP6276851B2 (ja) | 2013-08-01 | 2014-07-31 | 導電材組成物、これを用いたリチウム二次電池の電極形成用スラリー組成物およびリチウム二次電池 |
CN201480043654.0A CN105453316B (zh) | 2013-08-01 | 2014-07-31 | 导电材料组合物、使用该导电材料组合物的用于形成锂二次电池的电极的浆料组合物以及锂二次电池 |
US14/902,992 US10862124B2 (en) | 2013-08-01 | 2014-07-31 | Conducting material composition, slurry composition for forming electrode of lithium rechargeable battery and lithium rechargeable battery using the same |
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KR1020140098034A KR101601949B1 (ko) | 2013-08-01 | 2014-07-31 | 도전재 조성물, 이를 사용한 리튬 이차 전지의 전극 형성용 슬러리 조성물 및 리튬 이차 전지 |
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EP (1) | EP3002808B1 (ko) |
JP (1) | JP6276851B2 (ko) |
KR (1) | KR101601949B1 (ko) |
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CN106715508B (zh) * | 2014-09-30 | 2020-04-21 | 富士胶片株式会社 | 凝胶粒子、感光性组合物、油墨组合物、凝胶粒子的水分散物的制造方法及图像形成方法 |
KR101672750B1 (ko) * | 2016-02-11 | 2016-11-04 | 한밭대학교 산학협력단 | 친수성 내열 고분자가 포함된 다층구조전극 및 이의 제조방법 그리고 이를 포함하는 리튬이차전지 |
WO2019244643A1 (ja) * | 2018-06-20 | 2019-12-26 | 日本ゼオン株式会社 | 二次電池機能層用スラリーの製造方法 |
JP6798531B2 (ja) * | 2018-07-19 | 2020-12-09 | トヨタ自動車株式会社 | 非水電解質二次電池 |
WO2020196115A1 (ja) * | 2019-03-28 | 2020-10-01 | 日本ゼオン株式会社 | リチウムイオン二次電池電極用導電材ペースト、リチウムイオン二次電池電極用スラリー組成物、リチウムイオン二次電池用電極およびリチウムイオン二次電池 |
CN110336037B (zh) * | 2019-07-18 | 2021-08-17 | 上海交通大学 | 一种用于锂离子电池负极材料的水系粘结剂及其制备方法 |
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KR101601949B1 (ko) | 2016-03-09 |
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EP3002808A4 (en) | 2017-01-25 |
US10862124B2 (en) | 2020-12-08 |
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