WO2022139272A1 - 이차전지 전극용 도전재 선분산 슬러리와 그 제조방법 및 도전재 선분산 슬러리를 적용하여 제조된 전극과 상기 전극을 구비한 이차전지 - Google Patents
이차전지 전극용 도전재 선분산 슬러리와 그 제조방법 및 도전재 선분산 슬러리를 적용하여 제조된 전극과 상기 전극을 구비한 이차전지 Download PDFInfo
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- WO2022139272A1 WO2022139272A1 PCT/KR2021/018682 KR2021018682W WO2022139272A1 WO 2022139272 A1 WO2022139272 A1 WO 2022139272A1 KR 2021018682 W KR2021018682 W KR 2021018682W WO 2022139272 A1 WO2022139272 A1 WO 2022139272A1
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- conductive material
- secondary battery
- dispersion slurry
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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 material for an electrode, a battery to which the same is applied, and a method for manufacturing the same, and more particularly, to a conductive material line-dispersed slurry for a secondary battery electrode, a method for manufacturing the same, and an electrode manufactured by applying the conductive material line-dispersed slurry; It relates to a secondary battery having the electrode.
- the conductive material is included in both the positive electrode and the negative electrode, and is a material used to improve electron movement characteristics between the active material and the active material or the active material and the current collector. Conductive materials are being developed mainly based on carbon-based materials.
- the conductive material pre-dispersion slurry is a solution in which a conductive material is dispersed in a solvent, and becomes a material constituting the electrode slurry together with an active material and a binder in a subsequent step.
- CNT carbon nanotube
- Such CNTs may exhibit excellent physical properties in various aspects such as excellent electrical properties, strength, stability, and thermal conductivity.
- CNTs are expected to increase energy density and improve lifespan compared to conventional powdered carbon materials, and to reduce the size of batteries. In particular, these advantages may act more advantageously in an electric vehicle battery that requires high capacity, fast charging, and the like.
- CNTs have low solubility and dispersibility, so it is difficult to apply them as an actual conductive material.
- CNTs exist in the form of aggregates or bundles in solution due to the strong Van-der Waals attraction between CNTs.
- a technology capable of effectively dispersing CNTs is required, and in particular, a method capable of appropriately or easily dispersing CNTs while minimizing damage to the CNTs is required.
- defects may occur on the surface of CNTs, thereby deteriorating physical properties such as electrical conductivity.
- An object of the present invention is to provide a technology and method capable of effectively dispersing CNTs while preventing or minimizing damage to CNTs in developing a conductive material to which CNTs are applied.
- the technical problem to be achieved by the present invention is to provide a conductive material pre-dispersion slurry for secondary battery electrodes with improved dispersion characteristics of CNT (conductive material) and a method for manufacturing the same.
- the technical problem to be achieved by the present invention is to provide a conductive material pre-dispersion slurry for secondary battery electrodes that has a relatively high CNT (conductive material) content and a relatively low viscosity and can be easily manufactured by a relatively simple process, and a method for manufacturing the same is to provide
- the technical problem to be achieved by the present invention is to provide an electrode manufactured by applying the aforementioned conductive material linear dispersion slurry and a secondary battery to which the electrode is applied.
- a conductive material linear dispersion slurry for a secondary battery electrode comprising: a conductive material; a dispersing agent for dispersing the conductive material; and a solvent mixed with the conductive material and the dispersing agent, wherein the dispersing agent includes a cellulosic compound and a vinyl or acrylic compound, and a weight ratio of the cellulosic compound and the vinyl or acrylic compound in the dispersant is 25:1 to 1:25, a conductive material pre-dispersion slurry for secondary battery electrodes is provided.
- a weight-average molecular weight (Mw) of the cellulosic compound may be about 450,000 g/mol or less.
- the degree of esterification (DE) of the cellulosic compound may be about 0.6 to about 1.0.
- the cellulosic compound is methylcellulose, ethylcellulose, hydroxyethylcellulose, benzylcellulose, tritylcellulose, cyanoethylcellulose, carboxymethylcellulose, carboxyethylcellulose, aminoethylcellulose, nitrocellulose, cellulose ether and sodium carboxymethylcellulose. It may be at least one selected from the group consisting of salts.
- the weight average molecular weight (Mw) of the vinyl-based compound may be about 6,000 to 80,000 g/mol, and the weight average molecular weight (Mw) of the acrylic compound may be about 8,000 to 150,000 g/mol.
- the vinyl-based or acrylic compound may be provided to surround the periphery of the conductive material.
- the vinyl-based compound may be at least one selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, polyvinyl chloride, polyvinyl fluoride, and polyvinyl acetate, or the acrylic compound is polyacrylic acid, polyacrylamide , and may be at least one selected from the group consisting of polyacrylonitrile.
- the conductive material may be at least one selected from the group consisting of graphite, carbon black, graphene, and carbon nanotubes (CNT).
- the carbon nanotube (CNT) may be a multi-walled carbon nanotube (MWCNT).
- the multi-walled carbon nanotubes may have a diameter of about 4 to 12 nm.
- a weight ratio of the carbon nanotubes (CNT) to the dispersant (CNT: dispersant) may be about 1:0.2 to 1:1.5.
- the content of the carbon nanotubes (CNT) in the conductive material pre-dispersion slurry may be greater than about 0% by weight and less than or equal to 6% by weight.
- the conductive material linear dispersion slurry may have a viscosity of about 3,000 cP or less at a temperature of 25° C. and a shear rate of 50 s ⁇ 1 .
- the D50 particle size of the conductive material pre-dispersion slurry may be less than about 0.1 ⁇ m.
- the solvent may include water.
- an electrode for a secondary battery manufactured by applying the aforementioned conductive material pre-dispersion slurry.
- a secondary battery having the above-described electrode is provided.
- a method for manufacturing a conductive material linear dispersion slurry for secondary battery electrodes including a conductive material CNT, a dispersing agent, and a solvent, wherein the dispersing agent includes a cellulosic compound and a vinyl or acrylic compound, , preparing a mixed solution in which the weight ratio of the cellulosic compound and the vinyl or acrylic compound in the dispersant is 25:1 to 1:25; and high-pressure dispersion of the mixed solution using a high-pressure disperser having an operating pressure of 200 bar or more.
- the step of preparing the mixed solution may include preparing a cellulose-based compound solution containing the cellulose-based compound and a vinyl-based or acrylic compound solution containing the vinyl-based or acrylic compound, respectively; preparing a first mixed solution containing the cellulose-based compound solution, the vinyl-based or acrylic compound solution, and the CNT; and stirring the first mixed solution.
- the high-pressure dispersion may be performed about 3 to 10 times at an operating pressure of about 500 to 2,500 bar.
- a conductive material pre-dispersion slurry for secondary battery electrodes with improved dispersion characteristics of CNTs (conductive material).
- a conductive material pre-dispersion slurry for secondary battery electrodes that has a relatively high CNT (conductive material) content and a relatively low viscosity and can be easily manufactured by a relatively simple process.
- An electrode having excellent performance can be manufactured by applying the aforementioned conductive material pre-dispersion slurry, and a secondary battery to which the aforementioned electrode is applied can be manufactured.
- FIG. 1 is a view for explaining the configuration of a conductive material pre-dispersed slurry for a secondary battery electrode according to an embodiment of the present invention.
- CMC carboxymethyl cellulose
- PVP polyvinylpyrrolidone
- FIG. 4 is a perspective view showing a carbon nanotube (CNT) that can be applied to a conductive material linear dispersion slurry for secondary battery electrodes according to an embodiment of the present invention.
- CNT carbon nanotube
- FIG. 5 is a flowchart illustrating a method of manufacturing a conductive material linear dispersion slurry for secondary battery electrodes according to an embodiment of the present invention.
- FIG. 6 is a flowchart illustrating process steps applicable to the method of manufacturing the conductive material linear dispersion slurry of FIG. 5 .
- FIG. 7 is a cross-sectional view illustrating a secondary battery having an electrode manufactured by applying a conductive material linear dispersion slurry for secondary battery electrodes according to an embodiment of the present invention.
- connection not only means that certain members are directly connected, but also includes indirectly connected members with other members interposed therebetween.
- FIG. 1 is a view for explaining the configuration of a conductive material pre-dispersed slurry for a secondary battery electrode according to an embodiment of the present invention.
- the conductive material pre-dispersion slurry for secondary battery electrodes includes a conductive material 10 and a dispersant 20 for dispersing the conductive material 10, and the conductive material ( 10) and a solvent 30 that is mixed with the dispersant 20 to provide fluidity may be included.
- the conductive material 10 may be at least one selected from the group consisting of graphite, carbon black, graphene, and carbon nanotube (CNT), and specifically CNT or may include CNT.
- the conductive material 10 may be made of a plurality of CNTs.
- the dispersant 20 may include a cellulose-based compound and a vinyl-based or acrylic-based compound.
- the weight ratio of the cellulosic compound and the vinyl or acrylic compound may be about 25:1 to 1:25.
- the weight ratio of the cellulosic compound to the vinyl compound may be 25:1 to 1:25
- the cellulosic compound and the The weight ratio of the acrylic compound may be 25:1 to 1:25.
- the solvent 30 may be, for example, water.
- CNTs As the conductive material 10, by using a mixture of a cellulose compound and a vinyl or acrylic compound as the dispersing agent 20, and adjusting their weight ratio to about 25:1 to 1:25, the dispersion properties of CNTs can be improved It can be significantly improved, and the particle size of CNTs in the conductive material pre-dispersion slurry can be greatly reduced.
- the weight-average molecular weight (Mw) of the cellulosic compound may be about 450,000 g/mol or less. Specifically, it may be 120,000 g/mol or less.
- a cellulose-based compound having a weight average molecular weight (Mw) of about 50,000 to 120,000 g/mol or a cellulose-based compound having a weight average molecular weight (Mw) of about 120,000 to 450,000 g/mol can be used in the conventional slurry for secondary battery electrodes, the cellulosic compound may be used as a binder.
- the molecular weight is approximately 1,500,000 g/mol, which is significantly different from the cellulosic compound used in the embodiment of the present invention.
- a cellulosic compound having a weight average molecular weight (Mw) of about 450,000 g/mol or less when used, the viscosity of the conductive material linear dispersion slurry can be lowered, and the dispersibility of CNTs can be easily improved. have.
- the weight average molecular weight (Mw) of the cellulosic compound is about 120,000 g/mol or less, the coating property of the electrode slurry including the conductive material pre-dispersion slurry may be further improved and electrode formation may be further improved.
- the degree of esterification (DE) of the cellulosic compound used in the embodiment of the present invention may be about 0.6 to about 1.0.
- CMC carboxymethyl cellulose
- the degree of esterification (DE) of the cellulosic compound may range from 0 to 3 (ie, corresponding to the number of OR groups in FIG. 2 ).
- the degree of esterification (DE) of carboxymethyl cellulose (CMC), which is one of the cellulosic compounds used in this embodiment, may be about 0.6 to 1.0 or about 0.7 to 0.9. As the degree of esterification (DE) of CMC increases, the hydrophilicity of CMC may increase. If the degree of esterification (DE) is less than 0.6, the degree of hydration may be too low to be miscible with water. When the degree of esterification (DE) exceeds 1.0, the dispersibility of CNTs may decrease.
- the cellulosic compound is methylcellulose, ethylcellulose, hydroxyethylcellulose, benzylcellulose, tritylcellulose, cyanoethylcellulose, carboxymethylcellulose, carboxyethylcellulose, aminoethylcellulose, nitrocellulose, cellulose ether and sodium carboxymethylcellulose. It may be at least one selected from the group consisting of salts.
- CMC of Figure 2 is sodium carboxymethyl cellulose (ie, Na CMC).
- the glucose ring (glucose ring) portion of the CMC can be hydrophobically bonded to the surface of the CNT, and the carboxylate portion (carboxylate) portion is hydrophilic and binds to water to disperse the CNT in water.
- CMC can form a structure aligned with CNTs in water (solvent), in which case the binding of hydrophobic moieties may play an important role.
- the -OH group ie, the equatorial hydroxyl group
- Such CMC can serve as a dispersion stabilizer of CNTs by using rigid properties.
- the weight average molecular weight (Mw) of CMC may be about 450,000 g/mol or less.
- the degree of esterification (DE) of CMC may be about 0.6 to about 1.0.
- the degree of substitution of a hydroxyl group with an ester group based on the monomer of cellulose ie, degree of substitution
- CMC can easily improve the dispersibility of CNTs while being well miscible with the solvent (water).
- a vinyl-based or acrylic compound may be additionally used together with CMC as the dispersing agent 20 .
- the vinyl-based or acrylic compound may be provided to surround the periphery of the conductive material.
- the weight average molecular weight (Mw) of the vinyl-based compound used in an embodiment of the present invention may be 6,000 to 80,000 g/mol, and the weight average molecular weight (Mw) of the acrylic compound may be 8,000 to 150,000 g/mol. . More specifically, the weight average molecular weight (Mw) of PVP (polyvinylpyrrolidone, polyvinylpyrrolidone), which is one of the vinyl compounds, may be about 6,000 to 80,000 g/mol.
- the weight average molecular weight (Mw) of the PVP may be about 6,000 to 15,000 g/mol.
- the PVP may be provided to surround the periphery of the CNT.
- the PVP may be provided so as to be adsorbed to the CNT and surround (ie, wrap) the CNT.
- PVP is adsorbed to the CNTs and surrounds the CNTs, thereby dispersing the CNTs in a solvent (ex, water).
- a solvent ex, water
- the type (molecular weight) of PVP suitable therefor may vary depending on the type of CNT.
- the weight average molecular weight (Mw) of the PVP is less than 6,000 g/mol, the wrapping itself may not work well, the viscosity of the conductive material pre-dispersion slurry may increase, and the dispersibility of the CNT may be deteriorated.
- the weight average molecular weight (Mw) of PVP exceeds 80,000 g/mol, the viscosity of the conductive material pre-dispersed slurry may increase and the dispersibility of CNTs may decrease. Therefore, in the embodiment of the present invention, it may be preferable that the weight average molecular weight (Mw) of PVP is about 6,000 to 80,000 g/mol.
- the vinyl-based compound may be at least one selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, polyvinyl chloride, polyvinyl fluoride, and polyvinyl acetate.
- the acrylic compound may be at least one selected from the group consisting of polyacrylic acid, polyacrylamide, and polyacrylonitrile.
- FIG. 3 is a view showing the chemical formula of PVP that can be applied to the conductive material linear dispersion slurry for secondary battery electrodes according to an embodiment of the present invention.
- a pyrrolidone group of PVP may be hydrophilic, and an alkyl group below it may be hydrophobic.
- the alkyl group may have a flexible linear structure, and may have a property of wrapping the CNTs.
- Mw weight average molecular weight
- the weight average molecular weight (Mw) of the PVP exceeds 80,000 g/mol, the molecular weight becomes excessively large, the viscosity of the conductive material pre-dispersed slurry may increase, and the dispersibility of the CNT may decrease. Therefore, as described above, it may be preferable that the weight average molecular weight (Mw) of PVP in the embodiment of the present invention is about 6,000 to 80,000 g/mol.
- Specific types of PVP may include k12, k15, k30, k90, and the like, and among them, PVP corresponding to k15 and k30 may be applied to an embodiment of the present invention.
- the CNT used as the conductive material 10 in the embodiment of the present invention is a material that complements the conductivity of the active material in the positive or negative electrode of the secondary battery and forms a path through which electrons can move.
- can CNTs are linear carbon bodies that connect an active material-active material or an active material-current collector at a much longer distance than a powder, and may easily form a network structure.
- the CNT used in the embodiment of the present invention may be a multi-walled carbon nanotube (MWCNT).
- MWCNT multi-walled carbon nanotube
- the electrical performance is better than that of MWCNT, but it is difficult to prepare a high content CNT dispersion and the manufacturing cost (price) is high.
- MWCNTs the small diameter of CNTs ranges from several nm to tens of nm for large ones. If the diameter is more than about 12 nm, the BET specific surface area is low, so dispersion may be easy, but the electrical conductivity may be reduced, so that it may not perform well as a conductive material in the secondary battery. Since the CNT applied to the present invention is thin among MWCNTs and has a long length, it has the advantages of quality close to that of SWCNTs and the price advantages of MWCNTs at the same time.
- FIG. 4 is a perspective view showing CNTs that can be applied to a conductive material pre-dispersion slurry for secondary battery electrodes according to an embodiment of the present invention.
- CNTs that can be applied to the conductive material pre-dispersion slurry according to an embodiment of the present invention may be MWCNTs.
- MWCNTs may have 3 to 10 walls, and may have a diameter of 4 to 12 nm.
- the length of the MWCNTs may be about 50 to 200 ⁇ m.
- Brunauer-Emmett-Teller (BET) specific surface area of MWCNTs may be about 300 m 2 /g or more.
- the BET specific surface area of MWCNTs may be about 300 to 500 m 2 /g. Since the MWCNT used has a large BET specific surface area of about 300 m 2 /g or more, it may be advantageous for improving conductivity.
- the bulk density of MWCNTs may be about 0.042 g/ml, and the purity may be about 96.96%.
- CMC and PVP are used together as the dispersing agent 20, and the dispersion properties of MWCNTs can be greatly improved by appropriately selecting their use ratio and appropriately selecting their physical properties. While PVP properly wraps the MWCNT, CMC maintains the phase stability of the dispersion. Therefore, according to an embodiment of the present invention, it is possible to prepare a conductive material pre-dispersion slurry having a low viscosity and small particle size characteristics even if MWCNTs are used.
- CMC and PVP are mixed and used as dispersants in the conductive material pre-dispersion slurry according to an embodiment of the present invention and their weight ratio (CMC:PVP) is adjusted to about 25:1 to 1:25, the dispersion properties of CNTs are significantly improved and can significantly lower the particle size of CNTs.
- the content of the dispersant compared to CNT may also affect the dispersion and viscosity properties.
- the weight ratio of the CNT and the dispersant is about 1:0.2 to 1:1.5, or about 1:0.5 to 1:1.
- the dispersant ie, CMC + PVP
- the dispersant may be included in an amount of about 20 to 150% or about 50 to 100% compared to the CNT.
- the ratio of the dispersant (ie, CMC + PVP) to the CNT is less than 20%, the CNT dispersibility may deteriorate, and if it exceeds 150%, the viscosity of the slurry may increase to an undesirable level and the electrical conductivity may decrease. have.
- the content of the CNT in the conductive material pre-dispersion slurry according to an embodiment of the present invention may be about 6% by weight or less. That is, the content of the CNT in the total weight of the conductive material pre-dispersion slurry may be greater than about 0% by weight and not more than 6% by weight. For example, the content of the CNT may be about 1 to 6% by weight. When the content of the CNTs exceeds 6% by weight, the viscosity of the slurry may increase to an undesirable level and electrical conductivity may decrease. An electrode having excellent performance can be manufactured by increasing the dispersibility of CNTs while using a small amount of CNTs. However, the content of CNTs is not limited to the above, and may vary depending on the case.
- the conductive material linear dispersion slurry may have a viscosity of about 3,000 cP or less at a temperature of 25° C. and a shear rate of 50 s ⁇ 1 .
- the viscosity of the conductive material pre-dispersion slurry may be about 2,000 cP or less or about 1,000 cP or less. Even when the CNT content is as high as 6 wt%, the conductive material linear dispersion slurry may be prepared to have a low viscosity of about 3,000 cP or less or about 1,000 cP or less.
- the D50 particle size may be less than about 0.1 ⁇ m.
- CNTs can be well dispersed evenly so that the D50 value is less than about 0.1 ⁇ m.
- the performance of an electrode manufactured using the slurry may be excellent.
- FIG. 5 is a flowchart illustrating a method of manufacturing a conductive material linear dispersion slurry for secondary battery electrodes according to an embodiment of the present invention.
- the method for preparing a conductive material pre-dispersion slurry for secondary battery electrodes includes the steps of preparing a mixed solution including a conductive material, a dispersing agent and a solvent (S10) and applying the mixed solution at high pressure It may include high-pressure dispersion using a disperser (S20).
- the conductive material may include CNT
- the dispersant may include CMC and PVP.
- the weight ratio of CMC to PVP (CMC:PVP) in the dispersant may be about 25:1 to 1:25.
- the operating pressure of the high-pressure disperser may be about 200 bar or more.
- the operating pressure of the high-pressure disperser may be about 200 to 3,000 bar.
- High-pressure dispersion using the high-pressure disperser may be performed by about 3 to 10 times (pass) or about 4 to 8 times (pass) at an operating pressure of about 500 to 2,500 bar.
- Step S10 that is, the step of preparing the mixed solution may be composed of detailed steps (S11 to S13) as shown in FIG.
- a cellulose-based compound solution containing the cellulose-based compound and a vinyl-based or acrylic compound solution containing the vinyl-based or acrylic compound are prepared, respectively.
- S11 preparing a first mixed solution containing the cellulosic compound solution, the vinyl or acrylic compound solution, and the CNT
- step S12 preparing a first mixed solution containing the cellulosic compound solution, the vinyl or acrylic compound solution, and the CNT
- step S13 the first liquid mixture may be prepared by mixing the cellulosic compound solution and the vinyl or acrylic compound solution with CNT and an additional solvent (ex, distilled water).
- the first mixture may be stirred at a speed of about 3,000 to 10,000 rpm for about 10 minutes to 1 hour.
- the specific process conditions disclosed herein are exemplary and may vary depending on the case.
- the mixed solution may be referred to as a CNT dispersion solution.
- the conductive material pre-dispersion slurry By dispersing the mixed solution at high pressure in step S20 of FIG. 5 , the conductive material pre-dispersion slurry according to the embodiment can be prepared.
- the configuration and characteristics of the conductive material pre-dispersion slurry may be the same as described with reference to FIGS. 1 to 4 .
- the weight average molecular weight (Mw) of the CMC may be about 450,000 g/mol or less, and the esterification degree (DE) of the CMC may be about 0.6 to about 1.0.
- the weight average molecular weight (Mw) of the PVP in the conductive material pre-dispersion slurry may be about 6,000 to 80,000 g/mol.
- the CNTs may be MWCNTs, and in this case, the MWCNTs may have a diameter of about 4 to 12 nm.
- the length of the MWCNTs may be about 50 to 200 ⁇ m, and the BET specific surface area of the MWCNTs may be about 300 m 2 /g or more.
- a weight ratio of the CNT to the dispersant (CNT: dispersant) may be about 1:0.2 to 1:1.5.
- the content of the CNT in the conductive material pre-dispersion slurry may be about 6% by weight or less.
- the conductive material linear dispersion slurry may have a viscosity of about 3,000 cP or less at a temperature of 25° C. and a shear rate of 50 s ⁇ 1 .
- the D50 particle size of the conductive material pre-dispersion slurry may be less than about 0.1 ⁇ m.
- specific configurations and characteristics of the conductive material pre-dispersion slurry may be the same as described with reference to FIGS. 1 to 4 .
- the conductive material linear dispersion slurry according to an embodiment of the present invention was prepared by the following method and its characteristics were evaluated.
- the CNT dispersion solution (mixed solution) was subjected to a high-pressure dispersion process 5 to 12 times (pass) at 1,300 bar using a high-pressure disperser (Micronox, MN400BF) to conduct a conductive material containing 3% by weight of CNTs A pre-dispersion slurry is prepared.
- a high-pressure disperser Mocronox, MN400BF
- the viscosity was measured using a HR-2 Viscometer (TA Instruments) at a temperature of 25° C., a shear rate of 50 s ⁇ 1 , and a plate condition of ⁇ 40 mm. .
- the conductive material linear dispersion slurry prepared as described above was diluted to 0.0004 wt%, and then the D50 particle size was measured using a particle size analyzer (Malvern).
- the conductive material pre-dispersion slurry prepared as described above was coated on a PET film with a thickness of 7 to 8 ⁇ m using a blader, and the sheet resistance was measured using a sheet resistance measuring instrument MCP-T610 (Mitsubishi Chemical).
- the weight average molecular weight (Mw) of PVP used in Table 1 is 6,000 to 80,000 g/mol
- the weight average molecular weight (Mw) of PVA is 6,000 to 40,000 g/mol
- the weight average molecular weight (Mw) of PAA is 8,000 to 120,000 g/mol mol
- the weight average molecular weight (Mw) of PAM is 10,000 to 150,000 g/mol.
- Example 1 5 0.144 3.606 2.88 72.12 75 0.6 ⁇ 1.0
- Example 2 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 3 5 0.375 3.375 7.50 67.50 75 0.6 ⁇ 1.0
- Example 4 5 0.750 3.000 15.00 60.00 75 0.6 ⁇ 1.0
- Example 5 5 1.250 2.500 25.00 50.00 75 0.6 ⁇ 1.0
- Example 6 5 1.875 1.875 37.50 37.50 75 0.6 ⁇ 1.0
- Example 7 5 2.500 1.250 50.00 25.00 75 0.6 ⁇ 1.0
- Example 8 5 3.000 0.750 60.00 15.00 75 0.6 ⁇ 1.0
- Example 9 5 3.375 0.375 67.50 7.50 75 0.6 ⁇ 1.0
- Example 10 5 3.563 0.188 71.25 3.75 75
- Example 2 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 18 5 0.125 2.375 2.5 47.5 50 0.6 ⁇ 1.0
- Example 19 5 0.0625 1.1875 1.25 23.75 25 0.6 ⁇ 1.0
- Example 20 5 0.05 0.95 One 19 20 0.6 ⁇ 1.0
- Example 21 5 0.0375 0.7125 0.75 14.25 15 0.6 ⁇ 1.0
- Example 22 5 0.25 4.75 5 95 100 0.6 ⁇ 1.0
- Example 23 5 0.3125 5.9375 6.25 118.75 125 0.6 ⁇ 1.0
- Example 24 5 0.375 7.125 7.5 142.5 150 0.6 ⁇ 1.0 Comparative Example 25 5 0.45 8.55 9 171 180 0.6 ⁇ 1.0
- the dispersant ratio means the ratio (%) of the dispersant (ie, CMC + PVP) to CNT. Referring to Example 2 and Examples 18 to 25, it can be seen that when the ratio of the dispersant is about 20 to 150% or about 50 to 100% compared to CNT, a low viscosity value is shown. In addition, it was confirmed to have a low D50 particle size ( ⁇ m) of 0.1 or less. Preferred (or optimal) ratios of CNT, dispersant component A (CMC), dispersant component B (PVP) and solvent in the conductive material predispersion slurry may be present.
- CMC dispersant component A
- PVP dispersant component B
- solvent in the conductive material predispersion slurry may be present.
- CMC used in Tables 5 and 6 is CMC1
- the weight average molecular weight (Mw) of CMC1 is 50,000 to 120,000 g/mol.
- CMC used in Tables 7 and 8 was CMC different from CMC1 only in the degree of esterification.
- CMC used in Tables 9 and 10 is CMC2 to CMC4, the weight average molecular weight (Mw) of CMC2 is 200,000 to 450,000 g/mol, and the weight average molecular weight (Mw) of CMC3 is 700,000 to 1,000,000 g/mol, the weight of CMC4 The average molecular weight (Mw) is 1,500,000 to 2,300,000 g/mol.
- Dispersant A (% to CNT) Dispersant B (% to CNT) Dispersant ratio degree of esterification
- Example 2 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 26 6 0.225 4.275 3.75 71.25 75 0.6 ⁇ 1.0
- Example 27 7 0.2625 4.9875 3.75 71.25 75 0.6 ⁇ 1.0
- Dispersant A (% to CNT) Dispersant B (% to CNT) Dispersant ratio degree of esterification Example 2 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 28 5 0.1875 3.5625 3.75 71.25 75 1.0 ⁇ 1.5
- Example 2 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 29 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 30 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 31 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 2 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 32 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 33 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 34 5 0.1875 3.5625 3.75 71.25 75 0.6 ⁇ 1.0
- Example 28 of Tables 7 and 8 it can be seen that when CMC having an esterification degree of 1.0 to 1.5 was used, the viscosity and particle size were measured to be high.
- Examples 29 to 31 of Table 9 and Table 10 the results of the CNT dispersion according to the molecular weight of CMC can be seen. If the weight average molecular weight (Mw) of the CMC used increases beyond a predetermined level, there may be a problem in that the D50 particle size value is excessively increased.
- Mw weight average molecular weight
- the results of the dispersion according to the CNT diameter can be confirmed.
- the CNT diameter is smaller than 4 nm, the viscosity and particle size increase very significantly, making it difficult to prepare a high content CNT dispersion.
- the CNT diameter is larger than 12 nm, it is easy to prepare a dispersion having a low viscosity, but it is confirmed that the sheet resistance component is greatly increased, so that it may not play a role as a conductive material of the secondary battery.
- a slurry for an electrode can be prepared by mixing the conductive material pre-dispersion slurry according to the embodiment as described above with a predetermined active material and a binder, etc., and the electrode slurry is applied on a predetermined substrate, followed by a drying process Alternatively, an annealing process may be performed to form an electrode (electrode film) for a secondary battery. In addition, a secondary battery to which such an electrode is applied can be manufactured.
- FIG. 7 is a cross-sectional view showing a secondary battery having an electrode manufactured by applying a conductive material linear dispersion slurry for secondary battery electrodes according to an embodiment of the present invention.
- the secondary battery includes a cathode 100 and an anode 200 spaced apart from each other and an electrolyte 150 provided for ion movement therebetween. may include A separator 170 may be further provided between the positive electrode 100 and the negative electrode 200 to allow movement of the electrolyte 150 or movement of ions through the electrolyte 150 while physically separating them. . In some cases, the separator 170 may not be provided.
- the positive electrode 100 may include a predetermined positive electrode material.
- the positive electrode 100 may include a positive electrode active material, a first binder, and a first conductive material.
- the positive electrode active material, the first binder, and the first conductive material may constitute one positive electrode active material layer.
- the positive electrode 100 may include a positive electrode current collector bonded to the positive electrode active material layer. In this case, the positive electrode active material layer may be disposed between the positive electrode current collector and the electrolyte 150 .
- the negative electrode 200 may include a predetermined negative electrode material.
- the negative electrode 200 may include an anode active material, a second binder, and a second conductive material.
- the negative active material, the second binder, and the second conductive material may constitute one negative electrode active material layer.
- the negative electrode 200 may include an anode current collector bonded to the negative electrode active material layer. In this case, the anode active material layer may be disposed between the anode current collector and the electrolyte 150 .
- At least one of the positive electrode 100 and the negative electrode 200 may be manufactured by applying the conductive material pre-dispersion slurry according to the embodiment of the present invention.
- at least the negative electrode 200 among the positive electrode 100 and the negative electrode 200 may be manufactured by applying the conductive material pre-dispersion slurry according to the embodiment of the present invention.
- the secondary battery according to the present embodiment may be, for example, a lithium secondary battery, but may be other batteries.
- a technique/method capable of effectively dispersing CNTs while preventing/minimizing damage to CNTs it is possible to implement a conductive material pre-dispersion slurry for secondary battery electrodes with improved dispersion characteristics of CNTs (conductive material).
- a conductive material pre-dispersion slurry for secondary battery electrodes that has a relatively high CNT (conductive material) content and has a relatively low viscosity and can be easily manufactured by a relatively simple process.
- An electrode having excellent performance can be manufactured by applying the aforementioned conductive material pre-dispersion slurry, and a secondary battery to which the aforementioned electrode is applied can be manufactured.
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Abstract
Description
구분 | CNT (wt%) |
CMC1(A) (wt%) | PVP(B) (wt%) | PVA(B) (wt%) | PAA(B) (wt%) | PAM(B) (wt%) | 분산제A(CNT 대비%) | 분산제B(CNT 대비%) | 분산제 비율 | 에스테르화도 |
실시예1 | 5 | 0.144 | 3.606 | 2.88 | 72.12 | 75 | 0.6~1.0 | |||
실시예2 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예3 | 5 | 0.375 | 3.375 | 7.50 | 67.50 | 75 | 0.6~1.0 | |||
실시예4 | 5 | 0.750 | 3.000 | 15.00 | 60.00 | 75 | 0.6~1.0 | |||
실시예5 | 5 | 1.250 | 2.500 | 25.00 | 50.00 | 75 | 0.6~1.0 | |||
실시예6 | 5 | 1.875 | 1.875 | 37.50 | 37.50 | 75 | 0.6~1.0 | |||
실시예7 | 5 | 2.500 | 1.250 | 50.00 | 25.00 | 75 | 0.6~1.0 | |||
실시예8 | 5 | 3.000 | 0.750 | 60.00 | 15.00 | 75 | 0.6~1.0 | |||
실시예9 | 5 | 3.375 | 0.375 | 67.50 | 7.50 | 75 | 0.6~1.0 | |||
실시예10 | 5 | 3.563 | 0.188 | 71.25 | 3.75 | 75 | 0.6~1.0 | |||
실시예11 | 5 | 3.606 | 0.144 | 72.12 | 2.88 | 75 | 0.6~1.0 | |||
실시예12 | 5 | 0.375 | 3.375 | 7.50 | 67.50 | 75 | 0.6~1.0 | |||
실시예13 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예14 | 5 | 0.375 | 3.375 | 7.50 | 67.50 | 75 | 0.6~1.0 | |||
실시예15 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예16 | 5 | 0.375 | 3.375 | 7.50 | 67.50 | 75 | 0.6~1.0 | |||
실시예17 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
비교예1 | 5 | 0.121 | 3.629 | 2.42 | 72.58 | 75 | 0.6~1.0 | |||
비교예2 | 5 | 3.629 | 0.121 | 72.58 | 2.42 | 75 | 0.6~1.0 | |||
비교예3 | 5 | 0.121 | 3.629 | 2.42 | 72.58 | 75 | 0.6~1.0 | |||
비교예4 | 5 | 0.121 | 3.629 | 2.42 | 72.58 | 75 | 0.6~1.0 | |||
비교예5 | 5 | 0.121 | 3.629 | 2.42 | 72.58 | 75 | 0.6~1.0 |
구분 | 고압 분산 Pass 수 | 점도 (40 mm, 50 s-1, cP) | 입도 D50(㎛) | 비고 |
실시예1 | 6 | 1,313 | 0.0652 | A:B = 1:25 |
실시예2 | 5 | 864 | 0.0223 | A:B = 1:19 |
실시예3 | 5 | 732 | 0.0289 | A:B = 1:9 |
실시예4 | 5 | 1,220 | 0.0596 | A:B = 1:4 |
실시예5 | 5 | 1,510 | 0.0620 | A:B = 1:2 |
실시예6 | 7 | 2,329 | 0.0707 | A:B = 1:1 |
실시예7 | 5 | 1,688 | 0.0320 | A:B = 2:1 |
실시예8 | 5 | 1,650 | 0.0300 | A:B = 4:1 |
실시예9 | 5 | 1,350 | 0.0263 | A:B = 9:1 |
실시예10 | 5 | 1,270 | 0.0263 | A:B = 19:1 |
실시예11 | 6 | 1,828 | 0.0844 | A:B = 25:1 |
실시예12 | 5 | 1,245 | 0.0357 | A:B = 1:9 |
실시예13 | 5 | 9,84 | 0.0242 | A:B = 1:19 |
실시예14 | 5 | 1,522 | 0.0645 | A:B = 1:9 |
실시예15 | 5 | 1,020 | 0.0243 | A:B = 1:19 |
실시예16 | 5 | 1,417 | 0.0924 | A:B = 1:9 |
실시예17 | 5 | 1,110 | 0.0352 | A:B = 1:19 |
비교예1 | 9 | 3,410 | 10.5 | A:B = 1:30 |
비교예2 | 10 | 3,820 | 12.1 | A:B = 30:1 |
비교예3 | 11 | 3,722 | 5.7 | A:B = 1:30 |
비교예4 | 11 | 4,510 | 15.2 | A:B = 1:30 |
비교예5 | 11 | 4,250 | 10.4 | A:B = 1:30 |
구분 | CNT (wt%) |
CMC1(A) (wt%) | PVP(B) (wt%) | PVA(B) (wt%) | PAA(B) (wt%) | PAM(B) (wt%) | 분산제A(CNT 대비%) | 분산제B(CNT 대비%) | 분산제 비율 | 에스테르화도 |
실시예2 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예18 | 5 | 0.125 | 2.375 | 2.5 | 47.5 | 50 | 0.6~1.0 | |||
실시예19 | 5 | 0.0625 | 1.1875 | 1.25 | 23.75 | 25 | 0.6~1.0 | |||
실시예20 | 5 | 0.05 | 0.95 | 1 | 19 | 20 | 0.6~1.0 | |||
실시예21 | 5 | 0.0375 | 0.7125 | 0.75 | 14.25 | 15 | 0.6~1.0 | |||
실시예22 | 5 | 0.25 | 4.75 | 5 | 95 | 100 | 0.6~1.0 | |||
실시예23 | 5 | 0.3125 | 5.9375 | 6.25 | 118.75 | 125 | 0.6~1.0 | |||
실시예24 | 5 | 0.375 | 7.125 | 7.5 | 142.5 | 150 | 0.6~1.0 | |||
비교예25 | 5 | 0.45 | 8.55 | 9 | 171 | 180 | 0.6~1.0 |
구분 | 고압 분산 Pass 수 | 점도 (40 mm, 50 s-1, cP) | 입도 D50(㎛) | 비고 |
실시예2 | 5 | 864 | 0.0223 | A:B = 1:19 |
실시예18 | 5 | 1,025 | 0.0352 | A:B = 1:19 |
실시예19 | 6 | 1,822 | 0.0341 | A:B = 1:19 |
실시예20 | 7 | 2,510 | 0.075 | A:B = 1:19 |
실시예21 | 10 | 4,220 | 0.135 | A:B = 1:19 |
실시예22 | 5 | 1,135 | 0.0452 | A:B = 1:19 |
실시예23 | 5 | 1,520 | 0.0377 | A:B = 1:19 |
실시예24 | 5 | 2,311 | 0.0521 | A:B = 1:19 |
실시예25 | 8 | 3,460 | 0.092 | A:B = 1:19 |
구분 | CNT (wt%) |
CMC1(A) (wt%) | PVP(B) (wt%) | PVA(B) (wt%) | PAA(B) (wt%) | PAM(B) (wt%) | 분산제A(CNT 대비%) | 분산제B(CNT 대비%) | 분산제 비율 | 에스테르화도 |
실시예2 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예26 | 6 | 0.225 | 4.275 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예27 | 7 | 0.2625 | 4.9875 | 3.75 | 71.25 | 75 | 0.6~1.0 |
구분 | 고압 분산 Pass 수 | 점도 (40 mm, 50 s-1, cP) | 입도 D50(㎛) | 비고 |
실시예2 | 5 | 864 | 0.0223 | A:B = 1:19 |
실시예26 | 8 | 2,980 | 0.099 | A:B = 1:19 |
실시예27 | 12 | 6,645 | 0.52 | A:B = 1:19 |
구분 | CNT (wt%) |
CMC1(A) (wt%) | PVP(B) (wt%) | PVA(B) (wt%) | PAA(B) (wt%) | PAM(B) (wt%) | 분산제A(CNT 대비%) | 분산제B(CNT 대비%) | 분산제 비율 | 에스테르화도 |
실시예2 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예28 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 1.0~1.5 |
구분 | 고압 분산 Pass 수 | 점도 (40 mm, 50 s-1, cP) | 입도 D50(㎛) | 비고 |
실시예2 | 5 | 864 | 0.0223 | A:B = 1:19 |
실시예28 | 8 | 4,255 | 0.154 | A:B = 1:19 |
구분 | CNT (wt%) |
CMC1(A) (wt%) | CMC2(A) (wt%) | CMC3(A) (wt%) | CMC4(A) (wt%) | PVP(B) (wt%) | CMC (CNT 대비%) |
PVP (CNT 대비%) |
분산제 비율 | 에스테르화도 |
실시예2 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예29 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예30 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예31 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 |
구분 | 고압 분산 Pass 수 | 점도 (40 mm, 50 s-1, cP) | 입도 D50(㎛) | 비고 |
실시예2 | 5 | 864 | 0.0223 | A:B = 1:19 |
실시예29 | 8 | 2,248 | 0.0442 | A:B = 1:19 |
실시예30 | 10 | 3,462 | 5.44 | A:B = 1:19 |
실시예31 | 10 | 5,270 | 10.2 | A:B = 1:19 |
구분 | CNT (wt%) (2nm) |
CNT (wt%) (4~12nm) |
CNT (wt%) (15~25nm) |
CNT (wt%) (30~45nm) |
CMC1(A) (wt%) | PVP(B) (wt%) | 분산제A (CNT 대비%) |
분산제B (CNT 대비%) |
분산제 비율 | 에스테르화도 |
실시예2 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예32 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예33 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 | |||
실시예34 | 5 | 0.1875 | 3.5625 | 3.75 | 71.25 | 75 | 0.6~1.0 |
구분 | 고압 분산 Pass 수 | 점도 (40 mm, 50 s-1, cP) | 입도 D50(㎛) | 면저항 (Ohm/sq.) |
비고 |
실시예2 | 5 | 864 | 0.0223 | 12 | A:B = 1:19 |
실시예32 | 10 | 13,000 | 25.1 | 5 | A:B = 1:19 |
실시예33 | 5 | 625 | 0.0852 | 48 | A:B = 1:19 |
실시예34 | 5 | 433 | 0.154 | 151 | A:B = 1:19 |
Claims (20)
- 이차전지 전극용 도전재 선분산 슬러리로서,도전재; 상기 도전재를 분산시키기 위한 분산제; 및 상기 도전재 및 분산제와 혼합되는 용매를 포함하고,상기 분산제는 셀룰로오스계 화합물 및 비닐계 또는 아크릴계 화합물를 포함하며, 상기 분산제에서 상기 셀룰로오스계 화합물과 상기 비닐계 또는 아크릴계 화합물의 중량비는 25:1 내지 1:25인,이차전지 전극용 도전재 선분산 슬러리.
- 제 1 항에 있어서,상기 셀룰로오스계 화합물의 중량평균분자량(weight-average molecular weight; Mw)은 450,000 g/mol 이하인 이차전지 전극용 도전재 선분산 슬러리.
- 제 1 항에 있어서,상기 셀룰로오스계 화합물의 에스테르화도(degree of esterification; DE)는 0.6 내지 1.0 인 이차전지 전극용 도전재 선분산 슬러리.
- 제 1 항에 있어서,상기 셀룰로오스계 화합물은 메틸셀룰로오스, 에틸셀룰로오스, 히드록시에틸셀룰로오스, 벤질셀룰로오스, 트리틸셀룰로오스, 시아노에틸셀룰로오스, 카르복시메틸셀룰로오스, 카르복시에틸셀룰로오스, 아미노에틸셀룰로오스, 니트로셀룰로오스, 셀룰로오스에테르 및 카르복시메틸셀룰로오스 나트륨염으로 이루어진 군으로부터 선택되는 1종 이상인 이차전지 전극용 도전재 선분산 슬러리.
- 제 1 항에 있어서,상기 비닐계 화합물의 중량평균분자량(Mw)은 6,000~80,000 g/mol이고, 상기 아크릴계 화합물의 중량평균분자량(Mw)은 8,000~150,000 g/mol인 이차전지 전극용 도전재 선분산 슬러리.
- 제 1 항에 있어서,상기 비닐계 또는 아크릴계 화합물은 상기 도전재의 주위를 둘러싸도록 구비되는 이차전지 전극용 도전재 선분산 슬러리.
- 제 1 항에 있어서,상기 비닐계 화합물은 폴리비닐피롤리돈, 폴리비닐알콜, 폴리비닐클로라이드, 폴리비닐플루오라이드, 및 폴리비닐아세테이트로 이루어진 군으로부터 선택되는 1종 이상이고, 상기 아크릴계 화합물은 폴리아크릴산, 폴리아크릴아마이드, 및 폴리아크릴로니트릴로 이루어진 군으로부터 선택되는 1종 이상인 이차전지 전극용 도전재 선분산 슬러리.
- 제 1 항에 있어서,상기 도전재는 흑연, 카본블랙, 그래핀, 및 탄소나노튜브(CNT)로 이루어진 군에서 선택되는 1종 이상인 이차전지 전극용 도전재 선분산 슬러리.
- 제 8 항에 있어서,상기 탄소나노튜브(CNT)는 다중벽 탄소나노튜브(Multi-walled carbon nanotube; MWCNT)인 이차전지 전극용 도전재 선분산 슬러리.
- 제 9 항에 있어서,상기 다중벽 탄소나노튜브(MWCNT)는 4 내지 12 nm의 직경을 갖는 이차전지 전극용 도전재 선분산 슬러리.
- 제 8 항에 있어서,상기 탄소나노튜브(CNT)와 상기 분산제의 중량비(CNT:분산제)는 1:0.2 내지 1:1.5인 이차전지 전극용 도전재 선분산 슬러리.
- 제 8 항에 있어서,상기 도전재 선분산 슬러리에서 상기 탄소나노튜브(CNT)의 함량은 0 중량% 초과 6 중량% 이하인 이차전지 전극용 도전재 선분산 슬러리.
- 제 1 항에 있어서,상기 도전재 선분산 슬러리는, 25℃의 온도 및 50 s-1의 전단율(shear rate) 조건에서, 3,000 cP 이하의 점도를 갖는 이차전지 전극용 도전재 선분산 슬러리.
- 제 1 항에 있어서,상기 도전재 선분산 슬러리의 D50 입도(particle size)는 0.1 ㎛ 보다 작은 이차전지 전극용 도전재 선분산 슬러리.
- 제 1 항에 있어서,상기 용매는 물을 포함하는 이차전지 전극용 도전재 선분산 슬러리.
- 청구항 1 내지 15 중 어느 한 항에 기재된 도전재 선분산 슬러리를 적용하여 제조된 이차전지용 전극.
- 청구항 16에 기재된 전극을 구비하는 이차전지.
- 이차전지 전극용 도전재 선분산 슬러리의 제조방법으로서,도전재인 CNT, 분산제 및 용매를 포함하되, 상기 분산제는 셀룰로오스계 화합물 및 비닐계 또는 아크릴계 화합물을 포함하며, 상기 분산제에서 상기 셀룰로오스계 화합물과 상기 비닐계 또는 아크릴계 화합물의 중량비는 25:1 내지 1:25인 혼합용액을 마련하는 단계; 및상기 혼합용액을 200 bar 이상의 작동 압력을 갖는 고압분산기를 이용해서 고압분산하는 단계를 포함하는,이차전지 전극용 도전재 선분산 슬러리의 제조방법.
- 제 18 항에 있어서,상기 혼합용액을 마련하는 단계는,상기 셀룰로오스계 화합물을 포함하는 셀룰로오스계 화합물 용액 및 상기 비닐계 또는 아크릴계 화합물을 포함하는 비닐계 또는 아크릴계 화합물 용액을 각각 마련하는 단계;상기 셀룰로오스계 화합물 용액, 상기 비닐계 또는 아크릴계 화합물 용액 및 상기 CNT를 포함하는 1차 혼합액을 마련하는 단계; 및상기 1차 혼합액을 교반하는 단계를 포함하는 이차전지 전극용 도전재 선분산 슬러리의 제조방법.
- 제 18 항에 있어서,상기 고압분산은 500 내지 2,500 bar의 작동 압력으로 3 내지 10회 수행하는 이차전지 전극용 도전재 선분산 슬러리의 제조방법.
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CN202180087307.8A CN116648427A (zh) | 2020-12-22 | 2021-12-09 | 用于二次电池电极的导电材料预分散浆料及其制备方法,适用导电材料预分散浆料制备的电极和具备该电极的二次电池 |
JP2023538909A JP2024502286A (ja) | 2020-12-22 | 2021-12-09 | 二次電池電極用導電材プレ分散スラリーとその製造方法、及び導電材プレ分散スラリーを適用して製造された電極と前記電極を備えた二次電池 |
CA3203164A CA3203164A1 (en) | 2020-12-22 | 2021-12-09 | Conductor pre-dispersion slurry for secondary battery electrode, preparation method therefor, electrode manufactured by applying conductor pre-dispersion slurry, and secondary battery comprising same electrod |
EP21911339.6A EP4266428A1 (en) | 2020-12-22 | 2021-12-09 | Conductor pre-dispersion slurry for secondary battery electrode, preparation method therefor, electrode manufactured by applying conductor pre-dispersion slurry, and secondary battery comprising same electrode |
US18/338,640 US20230335747A1 (en) | 2020-12-22 | 2023-06-21 | Conductor pre-dispersion slurry for secondary battery electrode, preparation method therefor, electrode manufactured by applying conductor pre-dispersion slurry, and secondary battery comprising same electrode |
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US20230335747A1 (en) | 2023-10-19 |
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