WO2007072948A1 - 二次電池電極用バインダー組成物、二次電池電極用スラリー、及び二次電池電極 - Google Patents
二次電池電極用バインダー組成物、二次電池電極用スラリー、及び二次電池電極 Download PDFInfo
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- WO2007072948A1 WO2007072948A1 PCT/JP2006/325653 JP2006325653W WO2007072948A1 WO 2007072948 A1 WO2007072948 A1 WO 2007072948A1 JP 2006325653 W JP2006325653 W JP 2006325653W WO 2007072948 A1 WO2007072948 A1 WO 2007072948A1
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- secondary battery
- sulfonic acid
- acid group
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- polymer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
- C07C309/01—Sulfonic acids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- Secondary battery electrode binder composition secondary battery electrode slurry, and secondary battery electrode
- the present invention relates to a method for producing a composite polymer composition suitable as a binder composition for a secondary battery electrode, a composite polymer composition produced by the production method, a paste for a secondary battery electrode, And a secondary battery electrode.
- an active material such as a hydrogen storage alloy or black ship, carboxymethylcellulose as a thickener, and styrene-butadiene copolymer as a noda
- an active material such as a hydrogen storage alloy or black ship, carboxymethylcellulose as a thickener, and styrene-butadiene copolymer as a noda
- a method of applying and drying a paste obtained by kneading the combined latex and water as a dispersion medium on the surface of the current collector see, for example, Patent Documents 1 and 2).
- the binder functions to improve the adhesion between the electrode layer containing the active material and the current collector.
- the styrene-butadiene copolymer latex has a strong power even though it does not necessarily have sufficient adhesion to the current collector. Adhesion between the electrode layer and the current collector is not sufficient! / Secondary batteries using ⁇ electrodes cannot improve battery characteristics such as charge / discharge cycle characteristics. is there.
- Patent Documents As a related prior art, it is disclosed that a modified polymer in which a functional group such as a carboxyl group is introduced into a hydrogenated polymer is used as a binder for a lithium secondary battery (for example, Patent Documents). 3).
- a functional group such as a carboxyl group
- Patent Documents 3
- the effect of improving the adhesion between the electrode layer and the current collector is not necessarily sufficient.
- secondary batteries with electrodes with inadequate adhesion, especially with high-speed discharge capacity The decrease is remarkable.
- Patent Document 1 Japanese Patent Application Laid-Open No. 11 7948
- Patent Document 2 JP 2001-210318 A
- Patent Document 3 Japanese Patent Laid-Open No. 10-17714
- Patent Document 4 Japanese Patent No. 3601250
- the present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to provide a secondary battery excellent in cycle characteristics with less capacity loss during high-speed discharge.
- the present inventors include a polymer having sulfonic acid groups introduced at a predetermined ratio and an organic solvent mainly composed of N-methylpyrrolidone. As a result, it has been found that the above-mentioned problems can be achieved, and the present invention has been completed.
- binder composition for secondary battery electrode slurry for secondary battery electrode, and secondary battery electrode are provided.
- a binder composition for secondary battery electrodes which is OmmolZg.
- the polymer is (A1) sulfonic acid group-containing styrene Z ethylene Z butylene Z
- the (A) polymer is the (A1) sulfonic acid group-containing styrene Z ethylene Z butylene Z styrene copolymer
- the (A1) sulfonic acid group-containing styrene Z ethylene The binder composition for secondary battery electrodes according to the above [2], wherein the proportion of the structural unit derived from styrene contained in the len / butylene Z styrene copolymer is 30% by mass or more.
- the (A) polymer is (A2) a sulfonic acid group-containing acrylic copolymer
- the (A2) sulfonic acid group-containing acrylic copolymer is (meth) acrylic acid.
- a monomer component copolymer comprising Z or (meth) acrylic acid ester and a compound having an unsaturated polymerizable group and a sulfonic acid group in its molecular structure.
- a slurry for a secondary battery electrode comprising the binder composition for a secondary battery electrode according to any one of [1] to [4], and an electrode active material.
- the binder composition for a secondary battery electrode of the present invention can produce a secondary battery excellent in cycle characteristics with less capacity loss during high-speed discharge and good adhesion to a current collector.
- the slurry stability is also excellent.
- the slurry for secondary battery electrodes of the present invention can produce a secondary battery with excellent cycle characteristics with less capacity loss during high-speed discharge and good adhesion to the current collector. In addition, if the slurry stability is excellent, the following effects can be obtained.
- the secondary battery electrode of the present invention can produce a secondary battery having excellent cycle characteristics with less capacity loss during high-speed discharge, and good adhesion between the electrode layer and the current collector. If there is V, it will have the effect.
- One embodiment of the binder composition for a secondary battery electrode of the present invention comprises (A) a polymer containing a sulfonic acid group (hereinafter also referred to as “component (A)”) and (B) N-methylpyrrolidone.
- component (A) a polymer containing a sulfonic acid group
- component (B) N-methylpyrrolidone
- An organic solvent as a component hereinafter also referred to as “component (B)”
- a ratio of the sulfonic acid group contained in component (A) to 0.005-1. OmmolZg The details are described below.
- the component (A) contained in the secondary battery electrode binder composition of the present embodiment is a polymer containing a sulfonic acid group.
- a polymer containing a sulfonic acid group By using a polymer containing a sulfonic acid group, the adhesion to various current collectors such as aluminum is improved and peeling is less likely to occur, and secondary characteristics with excellent cycle characteristics are achieved. It is estimated that the battery can be manufactured.
- the proportion of the sulfonic acid group contained in the component (A) is 0.005-1. Ommol / g, preferably 0.001 to 0.8 mmol / g, and more preferably 0.002. ⁇ 0.6 mmol / g.
- (A) When the ratio of the sulfonic acid group contained in the component is less than 0. OlmmolZg, it becomes difficult to sufficiently improve the adhesion with the current collector. On the other hand, when the ratio of the sulfonic acid group contained in the component (A) is more than 1. OmmolZg, the slurry stability tends to decrease.
- the weight average molecular weight (Mw) of the component (A) is preferably 30,000 to 200,000.
- the force is preferably 50,000 to 150,000. S More preferably, 70,000 to 130. , 000 is particularly preferred.
- Mw of component (A) is less than 30,000, the adhesion to the current collector tends to be inferior.
- the Mw force of the component (A) is more than 3 ⁇ 400,000, the viscosity of the electrode slurry obtained using this binder yarn and composition tends to be high, and coating tends to be difficult.
- weight average molecular weight (Mw) is a molecular weight in terms of styrene, which is measured by gel permeation chromatography (GPC) using THF.
- GPC gel permeation chromatography
- Sulfonic acid group-containing styrene Z ethylene Z butylene Z styrene polymer (sulfonic acid group-containing SEBS), (A2) sulfonic acid group-containing acrylic copolymer, ethylene Z propylene polymer, styrene Z isoprene polymer, etc. be able to.
- SEBS sulfur acid group-containing SEBS
- A2 sulfonic acid group-containing acrylic copolymer ethylene Z propylene polymer
- styrene Z isoprene polymer etc.
- (A1) sulfonic acid group-containing SEBS, (A2) sulfonic acid group-containing acrylic system from the viewpoint of better adhesion to the current collector of the obtained binder composition for secondary battery electrodes
- a copolymer is preferred.
- the proportion of structural units derived from styrene (total bound styrene content) contained in SEBS is preferably 30% by mass or more, and more preferably 40% by mass or more. It is particularly preferably 45% by mass or more.
- the upper limit of the total bound styrene content is not particularly limited, but is preferably 80% by mass or less.
- SEBS examples include Dynalon series (trade name, manufactured by JSR), Lavalon series (trade name, manufactured by Mitsubishi Kagaku), Tuftec series (trade name, manufactured by Asahi Kasei), TPE— SB series (trade name, manufactured by Sumitomo Chemical Co., Ltd.)
- a sulfonic acid group-containing SEBS can be produced by introducing a sulfonic acid group into SEBS (sulfurizing SEBS). Specifically, a sulfonic acid group should be introduced into SEBS according to a known method described in, for example, the Chemical Society of Japan, New Experiment Course (14-III, pp. 1773), JP-A-2-227403, etc. Can do.
- a sulfonating agent can be used.
- a complex of sulfuric anhydride and an electron donating compound bisulfite (Na salt, K salt, Li salt, etc.), sulfuric anhydride, chlorosulfonic acid, fuming sulfuric acid, etc. can be suitably used. .
- the electron-donating compounds used for preparing the complex include ethers such as N, N-dimethylformamide, dioxane, dibutyl ether, tetrahydrofuran, and jetyl ether; pyridine, piperazine, trimethyl Amine, Triethylamine, Tributylamine And the like; sulfides such as dimethylsulfide and jetylsulfide; and -tolyl compounds such as acetonitrile, ethyl-tolyl and propyl-tolyl. Of these, N, N dimethylformamide and dioxane are preferred.
- a solvent inert to the sulfonating agent such as sulfuric anhydride or sulfuric acid
- the solvent inert to the sulfonating agent include halogenated hydrocarbons such as chloroformate, dichloromethane, tetrachloroethane, tetrachloroethylene and dichloromethane; -tro compounds such as nitromethane and nitrobenzene; liquid sulfur dioxide, Examples thereof include aliphatic hydrocarbons such as propane, butane, pentane, hexane and cyclohexane; ether solvents such as dioxane and tetrahydrofuran; water and the like. These solvents can be used by mixing two or more kinds as appropriate.
- the reaction temperature for sulfonation is usually -70 to 200 ° C, preferably 30 to 50 ° C. If it is less than 70 ° C, the sulfone reaction will be slow, which may not be economical. On the other hand, if it exceeds 200 ° C, side reaction may occur and the product may become blackened or insoluble.
- the (A2) sulfonic acid group-containing acrylic copolymer is a copolymer having at least structural units derived from (meth) acrylic acid and Z or (meth) acrylic acid ester.
- (meth) acrylic acid esters include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl ( (Meth) acrylate, tert butyl (meth) acrylate, pentyl (meth) acrylate, amyl (meth) acrylate, isoamyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (Meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acryl
- Phenoxyalkyl (meth) acrylates such as phenoxychetyl (meth) acrylate, 2-hydroxyl-3 phenoxypropyl (meth) acrylate, etc .
- Alkoxyalkyl (meth) acrylates such as methoxyethyl (meth) acrylate, ethoxy ethyl (meth) acrylate, propoxycetyl (meth) acrylate, butoxetyl (meth) acrylate, methoxybutyl (meth) acrylate ;
- Cycloalkyl (meth) acrylates such as rate, borne (meth) acrylate, isoborn (meth) acrylate, tricyclodehydrate (meth) acrylate;
- Unsaturated power such as (meth) acrylonitrile, ⁇ -chloroacrylonitrile, vinylidene cyanide nitrile nitriles; Cyanoalkyl esters of unsaturated carboxylic acids of nopropyl (meth) acrylate; Mention may be made of benzyl (meth) acrylate; tetrahydrofurfuryl (meth) acrylate.
- a sulfonic acid group-containing acrylic copolymer can be produced, for example, by introducing a sulfonic acid group into the acrylic copolymer (sulfonate the acrylic copolymer). .
- the same method as the above-mentioned (A1) sulfonic acid group-containing SEBS was used. Therefore, it can be manufactured.
- (A2) sulfonic acid group-containing acrylic copolymer includes (meth) acrylic acid, Z or (meth) acrylic acid ester, unsaturated polymerizable group and sulfonic acid in the molecular structure. It can also be produced by copolymerizing a monomer component containing a group-containing compound.
- a compound having an unsaturated polymerizable group and a sulfonic acid group in its molecular structure includes butyl sulfonic acid, styrene sulfonic acid, sulfoethyl metatalylate, metal sulfonic acid, and 2-hydroxy sulfonic acid. Examples thereof include propanesulfonic acid and metal salts thereof. Specifically, sodium styrene sulfonate (NaSS) and acrylamide-t-butyl sulfonic acid (ATBS) can be mentioned as preferred examples.
- NaSS sodium styrene sulfonate
- ATBS
- the monomer component that can be used to produce the (A2) sulfonic acid group-containing acrylic copolymer includes (meth) acrylic acid, (meth) acrylic acid ester, and molecules thereof.
- other monomers copolymerizable with these monomers can be contained. Examples of other monomers that can be included include styrene, OC-methylstyrene, dibutenebenzene, and the like.
- the component (B) contained in the secondary battery electrode binder composition of the present embodiment is an organic solvent containing N-methylpyrrolidone (NMP) as a main component.
- NMP N-methylpyrrolidone
- “consisting mainly of N-methylpyrrolidone (NMP)” specifically refers to other solvents within a range in which the physical properties of NMP are not significantly impaired. Means that may be contained. Therefore, trace amounts of organic solvents other than NMP may be contained.
- “having ⁇ -methylpyrrolidone (NMP) as a main component” means that the proportion of NMP contained in component (B) is 95% by mass or more, preferably 97% by mass or more, and more preferably 99% by mass. % or more, the most preferably rather is 100 mass 0/0!, cormorants.
- the binder composition for a secondary battery electrode of this embodiment can be prepared by mixing the component (A) and the component (B) and dissolving the component (A) in the component (B).
- the mixing ratio of the two can be appropriately set according to the purpose. Therefore, the secondary battery battery of this embodiment
- the solid content concentration of the electrode binder composition is not particularly limited, but is preferably 5 to 65% by mass, more preferably 10 to 60% by mass.
- the slurry for secondary battery electrodes of the present embodiment contains the above-described binder composition for secondary battery electrodes and an electrode active material.
- the secondary battery electrode slurry of the present embodiment can be prepared by mixing the secondary battery electrode binder composition and the electrode active material together with various additives added as necessary. .
- the slurry for the secondary battery electrode of the present embodiment contains 0.1 to: LO parts by mass of the binder for the secondary battery electrode as a solid content with respect to 100 parts by mass of the electrode active material. It is particularly preferable that the content is 0.2 to 5 parts by mass, and it is particularly preferable that the content is 0.3 to 4 parts by mass. If the amount of the binder for the secondary battery electrode is less than 0.1 part by mass, good adhesion tends not to be obtained. On the other hand, if it exceeds 10 parts by mass, the overvoltage tends to increase and affect the battery characteristics.
- various kneaders, bead mills, high-pressure homogenizers, and the like can be used.
- Various additives added to the slurry for secondary battery electrodes of the present embodiment as necessary include viscosity adjusting polymers that can be dissolved in NMP, conductive carbon such as graphite, metal powder, etc.
- a conductive material or the like can be added.
- the viscosity adjusting polymer that can be dissolved in NMP include ethylene vinyl alcohol, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, polymethyl methacrylate, and polyvinylidene fluoride.
- a hydrogen storage alloy powder is preferably used in an aqueous battery such as a nickel metal hydride battery. More specifically, it is based on MmNi and a part of Ni is replaced with elements such as Mn, Al, Co, etc.
- Mm represents misch metal, which is a mixture of rare earth elements.
- the electrode active material is preferably a powder having a particle diameter of 3 to 400 m and having passed through 100 mesh.
- non-aqueous batteries for example, MnO, MoO, VO , VO, Fe 2 O, Fe 2 O, Li CoO, Li, NiO, Li Co Sn O, Li Co
- Inorganic compounds such as Ni O, TiS, TiS, MoS, FeS, CuF, NiF; Fluorocarbon
- the use of a complex oxide is preferable because it allows assembly in both the positive and negative electrodes in a discharged state.
- Examples of the negative electrode active material include carbon fluoride, graphite, vapor grown carbon fiber and Z or pulverized product thereof, PAN-based carbon fiber and Z or pulverized product thereof, pitch-based carbon fiber and Z or Preferable examples include carbon materials such as pulverized materials, conductive polymers such as polyacetylene and poly-p-phenylene, and amorphous compounds composed of compounds such as tin oxide and fluorine.
- a graphite material such as natural graphite, artificial graphite, or graphite-mesophase carbon having a high degree of graphitization is used, a battery having good charge / discharge cycle characteristics and a high capacity can be obtained.
- the average particle size of the carbonaceous material is reduced current efficiency, reduced slurry stability, increased interparticle resistance in the coating film of the obtained electrode, etc. Is preferably 0.1 to 50; ⁇ ⁇ is preferably 1 to 45 / ⁇ ⁇ , more preferably 3 to 40 m.
- the secondary battery electrode of the present embodiment includes a current collector and an electrode layer formed by coating and drying the above-described slurry for a secondary battery electrode on the surface of the current collector.
- Examples of the current collector include water-based batteries such as Ni mesh, Ni-plated punching metal, expanded metal, wire mesh, foam metal, and reticulated metal fiber sintered body.
- members such as aluminum foil and copper foil, can be mentioned as a suitable example, for example.
- the above-mentioned slurry for secondary battery electrodes is applied to a predetermined thickness, and then heated and dried to form an electrode layer. Then, the secondary battery electrode of this embodiment can be obtained.
- a method for applying the slurry for the secondary battery electrode on the surface of the current collector a method using an arbitrary coater head such as a reverse roll method, a comma bar method, a gravure method, or an air knife method can be employed. .
- a blower dryer for example, in addition to a method of naturally leaving it to stand, a blower dryer, a hot air dryer, A drying method using an external wire heater, a far-infrared heater, or the like can be employed.
- the drying temperature is usually preferably 20 to 250 ° C, more preferably 130 to 170 ° C.
- the drying time is preferably 1 to 120 minutes, more preferably 5 to 60 minutes.
- the secondary battery electrode of the present embodiment can be suitably used as an electrode for either an aqueous battery or a non-aqueous battery.
- Nickel metal hydride battery negative electrodes can be used as water-based batteries, and alkaline secondary battery negative electrodes and lithium ion battery negative electrodes can be used as non-aqueous batteries.
- the non-aqueous electrolyte solution an electrolyte in which an electrolyte is dissolved in a non-aqueous solvent is usually used.
- the electrolyte is not particularly limited, but examples of alkaline secondary batteries include LiCIO, LiBF, LiAsF
- Examples of the solvent used in the electrolytic solution include ethers, ketones, latatones, nitriles, amines, amides, sulfur compounds, chlorinated hydrocarbons, esters, carbonates, Nitro compounds, phosphate ester compounds, sulfolane compounds, and the like can be used. Among these, ethers, ketones, nitriles, chlorinated hydrocarbons, carbonates, and sulfolane compounds are preferable.
- tetrahydrofuran 2-methyltetrahydrofuran, 1,4 dioxane, anisole, monoglyme, diglyme, triglyme, acetonitrile, propionitrile, 4-methyl-2-pentanone, butyronitrile, valeronitrile, benzonitrile, 1, 2 —Dichroic ethane, y Butyrolatatone, Dimethoxetane, Methyl formate, Propylene carbonate, Ethylene carbonate, Dimeth Examples include tilformamide, dimethyl sulfoxide, dimethylthioformamide, sulfolane, 3-methyl monosulfolane, trimethyl phosphate, or triethyl phosphate, or a mixed solvent thereof.
- a 5N or higher potassium hydroxide aqueous solution is usually used as the electrolyte for aqueous batteries.
- a battery is configured using components such as a separator, a terminal, and an insulating plate.
- the structure of the battery is not particularly limited.
- a cylindrical battery or the like wound in a roll can be exemplified.
- the secondary battery manufactured using the secondary battery electrode of the present embodiment can be suitably used for, for example, AV equipment, OA equipment, communication equipment, and the like.
- the obtained dried product was subjected to elemental sulfur analysis to calculate the sulfonic acid group content (mmol Zg).
- the electrode layer side surface of this test piece was attached to an aluminum plate using a double-sided tape.
- a 18 mm wide tape (trade name “Cero Tape (registered trademark)” (manufactured by Nichiban Co., Ltd.)) (specified in JIS Z1522) is attached to the surface of the test piece on the current collector side, and the 90 ° direction is at a speed of 50 mmZmin.
- the strength (gZcm) when the tape was peeled was measured 5 times, and the average value was calculated as the peel strength (gZcm). It can be evaluated that the higher the peel strength value, the higher the adhesion strength between the current collector and the electrode layer, and the more difficult it is for the current collector force electrode layer to peel off.
- Cycle characteristics (%) ⁇ (50th cycle discharge capacity) Z (1st cycle discharge capacity) ⁇ X 100 (1)
- the precipitated polymer was washed with methanol, and further washed with water until the pH of the washing water became 8.0 or less.
- the washed polymer was vacuum dried at 50 ° C. for 1 day to obtain a dried polymer.
- a separable flask was charged with 100 parts of the obtained dry polymer and 900 parts of NMP, and stirred at 50 ° C. for 2 hours to dissolve the dry polymer, thereby obtaining a polymer solution.
- the resulting polymer has a functional group (sulfonic acid group) content of 0.3 mmol Zg.
- a lithium foil punched to a diameter of 16.16 mm was placed in a two-pole coin cell (trade name “HS Flat Cell” (manufactured by Hosen Co., Ltd.)).
- a separator (trade name “Celgard # 2400” (manufactured by Celgard)) made of a polypropylene porous film punched to a diameter of 18 mm was placed, and an electrolytic solution was injected so that air did not enter.
- a positive electrode punched out to a diameter of 15.95 mm was placed, and the outer body was closed with a screw and sealed to produce a secondary battery.
- the cycle characteristics of the fabricated secondary battery were 90%.
- a polymer solution was obtained in the same manner as in Example 1 except that 100 parts of acetic anhydride, 50 parts of sulfuric acid, and 800 parts of a 10% aqueous sodium carbonate solution were used.
- the functional group (sulfonic acid group) content of the obtained polymer was 0.6 mmolZg.
- a positive electrode slurry was prepared in the same manner as in Example 1, and an evaluation electrode (positive electrode) was obtained.
- Table 1 shows the stability evaluation results of the positive electrode slurry and the measurement results of the peel strength of the positive electrode.
- a secondary battery was fabricated in the same manner as in Example 1. Table 1 shows the measurement results of the cycle characteristics of the fabricated secondary battery.
- ion-exchanged water 50 parts of ion-exchanged water, 1 part of reactive emulsifier (trade name “Adekaria Soap SR10”), 20 parts of methyl methacrylate, 65 parts of n-butyl acrylate, 5 parts of diacetone acrylamide, 8 parts of acrylonitrile , And 2 parts of Spinomer NaSS (manufactured by Tosohichi Co., Ltd.) were added and emulsified with stirring to obtain an emulsion. The obtained emulsion was continuously dropped into the aforementioned separable flask over 3 hours. During the dropping, nitrogen gas was introduced into the separable flask and the internal temperature was maintained at 75 ° C.
- the temperature was raised to 80 ° C. and reacted for 2 hours. Subsequently, after cooling to 25 ° C., the pH was adjusted to 7 with a 5% sodium hydroxide aqueous solution to obtain an aqueous dispersion of a sulfone group-containing polymer.
- 900 g of n-methylpyrrolidone was added to 100 g of water dispersion (converted to solid content), and water was volatilized by distillation under reduced pressure at 80 ° C. to obtain a polymer solution.
- the functional group (sulfonic acid group) content of the obtained polymer was 0.05 mmolZg.
- a positive electrode slurry was prepared in the same manner as in Example 1, and an evaluation electrode (positive electrode) was obtained.
- Table 1 shows the stability evaluation results of the positive electrode slurry and the measurement results of the peel strength of the positive electrode.
- a secondary battery was produced in the same manner as in Example 1.
- Table 1 shows the measurement results of the cycle characteristics of the fabricated secondary battery.
- a polymer solution was obtained in the same manner as in Example 3 except that 12 parts of methyl metatalylate and 10 parts of spinomer NaSS were used.
- the functional group (sulfonic acid group) content of the obtained polymer was 0.26 mmol Zg.
- a positive electrode slurry was prepared in the same manner as in Example 1, and an evaluation electrode (positive electrode) was obtained.
- Table 1 shows the results of evaluating the stability of the positive electrode slurry and the measurement results of the peel strength of the positive electrode.
- a secondary battery was fabricated in the same manner as in Example 1. Table 1 shows the measurement results of the cycle characteristics of the fabricated secondary battery.
- a polymer solution was obtained in the same manner as in Example 3 except that 21.8 parts of methylmetatalate and 0.2 parts of spinomer NaSS were used.
- the functional group (sulfonic acid group) content of the obtained polymer was 0.005 mmol Zg.
- a positive electrode slurry was prepared in the same manner as in Example 1 to obtain an evaluation electrode (positive electrode). Evaluation results of stability of positive electrode slurry, and Table 1 shows the measurement results of the peel strength of the positive electrode.
- a secondary battery was produced in the same manner as in Example 1. Table 1 shows the measurement results of the cycle characteristics of the fabricated secondary battery.
- a polymer solution was obtained in the same manner as in Example 1 except that 180 parts of acetic anhydride, 90 parts of sulfuric acid, and 1450 parts of a 10% aqueous sodium carbonate solution were used.
- the functional group (sulfonic acid group) content of the obtained polymer was 0.9 mmolZg.
- a positive electrode slurry was prepared in the same manner as in Example 1, and an evaluation electrode (positive electrode) was obtained.
- Table 1 shows the stability evaluation results of the positive electrode slurry and the measurement results of the peel strength of the positive electrode.
- a secondary battery was fabricated in the same manner as in Example 1. Table 1 shows the measurement results of the cycle characteristics of the fabricated secondary battery.
- a polymer solution was obtained in the same manner as in Example 1 except that 230 parts of acetic anhydride, 115 parts of sulfuric acid, and 1840 parts of a 10% aqueous sodium carbonate solution were used.
- the functional group (sulfonic acid group) content of the obtained polymer was 1.2 mmolZg.
- a positive electrode slurry was prepared in the same manner as in Example 1 to obtain an evaluation electrode (positive electrode).
- Table 1 shows the stability evaluation results of the positive electrode slurry and the measurement results of the peel strength of the positive electrode.
- a secondary battery was produced in the same manner as in Example 1. Table 1 shows the measurement results of the cycle characteristics of the fabricated secondary battery.
- Example 1 a positive electrode slurry was prepared in the same manner as in Example 1, and an evaluation electrode (positive electrode) was obtained.
- Table 1 shows the evaluation results of the stability of the positive electrode slurry and the measurement results of the peel strength of the positive electrode.
- the secondary battery was operated in the same manner as in Example 1. A pond was made. Table 1 shows the measurement results of the cycle characteristics of the fabricated secondary battery.
- the obtained polymer had a functional group (carboxylic acid group) content of 0.3 mmolZg.
- a positive electrode slurry was prepared in the same manner as in Example 1 to obtain an evaluation electrode (positive electrode).
- Table 1 shows the stability evaluation results of the positive electrode slurry and the measurement results of the peel strength of the positive electrode.
- a secondary battery was produced in the same manner as in Example 1.
- Table 1 shows the measurement results of the cycle characteristics of the fabricated secondary battery.
- the pH was adjusted to PH7 with a 5% aqueous sodium hydroxide solution to obtain an aqueous dispersion of a sulfone group-containing polymer.
- aqueous dispersion 10 Og Converted to solid content
- 900 g of n-methylpyrrolidone was added, and water was volatilized by vacuum distillation at 80 ° C. to obtain a polymer solution.
- the measurement of the carboxylic acid group was performed by omitting neutralization with a sodium hydroxide aqueous solution.
- the functional group content (force sulfonic acid group) of the polymer was 0.55 mmol Zg.
- Example 2 A positive electrode slurry was prepared to obtain an evaluation electrode (positive electrode).
- Table 1 shows the results of evaluating the stability of the positive electrode slurry and the measurement results of the peel strength of the positive electrode.
- a secondary battery was fabricated in the same manner as in Example 1.
- Table 1 shows the measurement results of the cycle characteristics of the fabricated secondary battery.
- the binder composition for secondary battery electrodes of the present invention can be suitably used for AV equipment, OA equipment, communication equipment, etc. having excellent cycle characteristics with less capacity loss during high-speed discharge.
- the secondary battery which can be provided can be provided.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
Claims
Priority Applications (4)
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JP2007551166A JP5186923B2 (ja) | 2005-12-22 | 2006-12-22 | 二次電池電極用バインダー組成物、二次電池電極用スラリー、及び二次電池電極 |
CN2006800531220A CN101379651B (zh) | 2005-12-22 | 2006-12-22 | 二次电池电极用粘合剂组合物、二次电池电极用浆料和二次电池电极 |
KR1020087016678A KR101328274B1 (ko) | 2005-12-22 | 2006-12-22 | 이차 전지 전극용 결합제 조성물, 이차 전지 전극용슬러리, 및 이차 전지 전극 |
US12/158,614 US8110306B2 (en) | 2005-12-22 | 2006-12-22 | Binder composition for secondary battery electrode, slurry for secondary battery electrode, and secondary battery electrode |
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JP2005-370993 | 2005-12-22 | ||
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PCT/JP2006/325653 WO2007072948A1 (ja) | 2005-12-22 | 2006-12-22 | 二次電池電極用バインダー組成物、二次電池電極用スラリー、及び二次電池電極 |
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US (1) | US8110306B2 (ja) |
JP (1) | JP5186923B2 (ja) |
KR (1) | KR101328274B1 (ja) |
CN (1) | CN101379651B (ja) |
TW (1) | TWI424608B (ja) |
WO (1) | WO2007072948A1 (ja) |
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KR101328274B1 (ko) | 2013-11-14 |
JPWO2007072948A1 (ja) | 2009-06-04 |
US8110306B2 (en) | 2012-02-07 |
TW200729595A (en) | 2007-08-01 |
TWI424608B (zh) | 2014-01-21 |
CN101379651B (zh) | 2011-09-07 |
US20090280409A1 (en) | 2009-11-12 |
KR20080075032A (ko) | 2008-08-13 |
JP5186923B2 (ja) | 2013-04-24 |
CN101379651A (zh) | 2009-03-04 |
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