47 results about "Fluorinated monomers" patented technology

The invention belongs to the technical field of fine chemical synthesis, belongs to a nonionic short fluorine chain surfactant, and relates to a preparation method of a fluorinated polyether surfactant. The preparation method comprises the following steps: reacting trimethylolethane with a hydrogen bromide acetic acid solution to prepare an intermediate 1; reacting the intermediate 1 in an alkaline environment without an organic solvent to prepare an intermediate 2; reacting the intermediate 2 with pentafluoropropanol under the action of potassium hydroxide and a catalyst 1 to prepare a fluorinated monomer; finally, the fluorinated monomer is subjected to ring opening polymerization under the action of an initiator and a catalyst 2, and the fluorinated polyether type surfactant is prepared. The method has the advantages of easily available raw materials, mild reaction conditions, simple synthesis, low cost, high yield and short fluorine chain of the product, can replace a long-chain fluorine-containing surfactant which is difficult to degrade, and can be used as an additive in the fields of photoresists, coatings, adhesives and the like. The surface tension can be obviously reduced, the surface defects of a coating can be reduced, and the appearance can be improved by adding a very small amount of the surface tension reducing agent.

Fluorinated gel polymer electrolytes for vehicle battery cells, battery cells, and methods of forming fluorinated gel polymer electrolytes are provided. The fluorinated gel polymer electrolyte includes a polymerized gel polymer electrolyte precursor. And the gel polymer electrolyte does not volatilize at 150 DEG C or below. The gel polymer electrolyte precursor includes a lithium salt present in a range of from 10 wt% to 50 wt% of the total weight of the gel polymer electrolyte precursor, a fluorinated monomer present in a range of from 10 wt% to 50 wt% of the total weight of the gel polymer electrolyte precursor, and a non-aqueous organic solvent present in a range of from 50 wt% to 90 wt% of the total weight of the gel polymer electrolyte precursor.

A fluorinated gel polymer electrolyte for a vehicle battery cell, a battery cell, and a method of forming a fluorinated gel polymer electrolyte. The fluorinated gel polymer electrolyte includes a polymerized gel polymer electrolyte precursor. The gel polymer electrolyte is involatile up to 150 degrees Celsius. The gel polymer electrolyte precursor includes a lithium salt present in the range of 10 to 50 percent by weight of the total weight of the of the gel polymer electrolyte precursor, a fluorinated monomer present in the range of 10 to 50 percent by weight of the total weight of the gel polymer electrolyte precursor, and a non-aqueous organic solvent present in the range of 50 to 90 percent by weight of the total weight of the gel polymer electrolyte precursor.

The invention provides a high-voltage gel polymer electrolyte, a preparation method thereof and a supercapacitor, and belongs to the technical field of supercapacitors. The preparation method comprises the following steps: adding a citric acid aqueous solution into polysaccharide powder, stirring to obtain a polysaccharide solution, adding nanocellulose whiskers into the polysaccharide solution, and performing ultrasonic treatment to form a modified polysaccharide composite solution; the preparation method comprises the following steps: stirring a fluorinated monomer and a cross-linking agent to form a mixed system, adding a photoinitiator into the mixed system, and stirring until the initiator is completely dissolved to obtain a monomer-cross-linking agent mixed solution; mixing and stirring the modified polysaccharide composite solution and the monomer-cross-linking agent mixed solution to form a composite precursor solution; soaking a substrate in a hydroxysilane ethanol solution for surface modification, uniformly coating the surface of the substrate with the composite precursor solution, performing cross-linking polymerization reaction through ultraviolet radiation to obtain a gel film, drying the gel film, soaking the dried gel film in an electrolyte, and extruding to obtain the high-pressure gel polymer electrolyte.

This application relates to a copolymer comprising repeating units derived from vinylidene fluoride and repeating units derived from fluorinated monomer M1, having a melting temperature Tm defined by the following relationship: (154.45 - 1.9472*x) - 3 < Tm (°C) < (154.45 - 1.9472*x) + 3 (where x is the weight content of the fluorinated monomer M1 expressed as a percentage based on the total weight of the copolymer, and the melting temperature is measured by DSC according to the ASTM E794-06 standard test method). This application also relates to the use of the composition in various technical fields.

This invention belongs to the field of UV coating technology, and particularly relates to a UV coating that requires no base coat and its preparation method. The raw materials for preparing the coating include the following components by weight: 20–35 parts acrylated epoxy resin, 15–25 parts polyurethane acrylate oligomer, 10–20 parts trimethylolpropane triacrylate, 2–6 parts fluorinated acrylate monomer, 3–8 parts photoinitiator, 0.5–2 parts polyether-modified siloxane leveling agent, 4–12 parts nanocomposite matte filler, 1–5 parts adhesion promoter, and 20–44.5 parts reactive diluent; pre-dispersed by stirring at a speed of 0 min for 20–40 minutes to obtain a premixed slurry; this invention achieves grade 0 adhesion for PET film through the synergistic effect of fluorinated monomer and adhesion promoter, solving the problem of easy peeling of flexible substrates; the fluorinated acrylate monomer achieves a surface tension ≤22 mN / m, realizing excellent hydrophobic and oleophobic properties; the nanocomposite matte filler stabilizes the gloss at 10–30 GU, meeting the requirements of high-end printing; the chemical energy density is 150–300 mJ / cm² (corresponding to 365–405). (nm light source), suitable for high-speed printing equipment.

The present application relates to a copolymer comprising a repeating unit derived from vinylidene fluoride and a repeating unit derived from a fluorinated monomer M1; the copolymer has a melting temperature Tm defined by the following relational expression: (154.45-1.9472 x)-3 < = Tm (DEG C) < = (154.45-1.9472 x) + 3 wherein x is the weight content of the fluorinated monomer M1, expressed as a percentage based on the total weight of the copolymer; and the melting temperature is measured through DSC according to an ASTM E794-06 standard test method. The invention also relates to application of the composition in various technical fields.

The present invention relates to a composition, preferably in powder form, comprising a polymer P1 comprising recurring units derived from vinylidene fluoride and recurring units derived from a monomer M1 selected from the group consisting of vinylidene fluoride, hexafluoropropene, tetrafluoroethylene, chlorotrifluoroethylene, vinyl fluoride, pentafluoropropene, tetrafluoropropene, trifluoroethylene, 1,2- difluoroethylene and perfluoroalkyle vinyl ethers, perfluoro(1,3-dioxole), perfluoro(2,2-dimethyl-1,3- dioxole) (PDD), a monomer of formula CF2=CFOCF2CF(CF3)OCF2CF2X wherein X is SO2F, CO2H, CH2OH, CH2OCN or CH2OPO3H; a monomer of formula CF2=CFOCF2CF2SO2F; a monomer of formula F(CF2)nCH2OCF=CF2 wherein n is 1, 2, 3, 4 or 5; a monomer of formula R1CH2OCF=CF2 wherein R1 is hydrogen atom or F(CF2)m and m is 1, 2, 3 or 4; a monomer of formula R2OCF=CH2 wherein R2 is F(CF2)p et p is 1, 2, 3 or 4; perfluorobutylethylene (PFBE); trifluoropropene, hexafluoroisobutylene, perfluorobutylethylene, bromotrifluoroethylene, chlorofluoroethylene, chlorotrifluoropropene and 2- trifluorométhyl-3,3,3-trifluoro-1-propene or mixture thereof; characterized in that the particles of said polymer P1 have a Dv99 size distribution lower than 89 microns and a Dv10 size distribution greater than 1.5 microns and in that said polymer P1 has a melting temperature Tm greater than 163.04 – 1.9628*x; wherein x is the weight content of said fluorinated monomer M1 expressed as percent based on the total weight of said polymer P1; the melting temperature being measured by DSC according to the ASTM E794- 06 (2018) standard test method.

The invention relates to a protective coating based on asymmetric comb-shaped waterborne polyurethane as well as a preparation method and application thereof, and the method comprises the following steps: mixing polyethylene glycol, isophorone diisocyanate and N, N-dimethylformamide, and reacting in a nitrogen atmosphere to obtain a prepolymer; adding a fluorine-containing monomer chain extender, 2-hydroxyethyl disulfide, 2-methyl-2-acrylic acid-2, 3-dihydroxy propyl ester and 2, 2-dimethylolpropionic acid into the prepolymer, and carrying out a reaction; then adding amino beta-cyclodextrin, after the reaction is finished, neutralizing with triethylamine to form salt, adding water, emulsifying to obtain waterborne polyurethane emulsion, coating the surface of a base material with the waterborne polyurethane emulsion, and curing to obtain the protective coating. The coating not only can provide physical barrier protection in an extreme humid environment and an acid-base corrosive medium, but also can relieve the pressure of toxic and harmful volatile gas compounds VOCs on the environment, and also can ensure the long-term stability of a coating material through a self-repairing effect, so that the protection effect and the service life of the coating are further improved.

A method for producing a fluorine-containing polymer includes a step for polymerizing, in an aqueous dispersion containing a first fluorine-containing polymer and an aqueous medium, a monomer containing a fluorine-containing monomer to produce a second fluorine-containing polymer different from the first fluorine-containing polymer. The first fluorine-containing polymer contains a first structural unit based on TFE and a second structural unit based on at least one selected from the group consisting of HFP and compounds represented by formula (1). The fluorine-containing polymer has a Tg of 10°C or less, a total amount of heat generation of 10 J / g or less in the region from 300°C to 50°C as measured by DSC, and a content of 100 mass ppm or less of fluorine-containing emulsifier. Formula 1: CZ2=CX(CF2)mY

This invention relates to the field of coating preparation technology, and discloses a graphene epoxy zinc-rich primer and its preparation method. The graphene epoxy zinc-rich primer uses polyimide-modified graphene and fluoride-modified epoxy acrylate resin as the matrix, compounded with zinc powder microcapsules, passivated zinc-aluminum alloy powder, and nano-titanium dioxide as functional fillers, supplemented with reactive diluents, functional additives, and solvent-free curing agents. It is prepared by modifying graphene oxide grafted with polyimide, epoxy acrylate resin grafted with fluorinated monomers, fluorinated graphene coated with zinc powder, and passivated zinc-aluminum alloy powder, followed by stepwise feeding and gradient dispersion processes. This improves the coating's barrier properties, cathodic protection efficiency, and density, achieving synergistic effects of long-term and emergency sacrificial protection, meeting the requirements of heavy-duty corrosion protection.

The invention belongs to the technical field of polymer composite materials, and particularly relates to an automobile film with heat insulation and hydrophobic effects and a preparation method thereof. The preparation method of the automobile film with the heat-insulating and hydrophobic effects comprises the following steps: carrying out a reaction on a fluorine-containing monomer, oleic acid, a reactive ultraviolet light absorber and alkenyl modified ATO / TiO2 to prepare a composite modifier; the preparation method comprises the following steps: reacting polypropylene with glycidyl methacrylate and styrene to prepare graft modified polypropylene containing active groups; carrying out melt blending, extrusion, cooling and grain-sized dicing on the grafted modified polypropylene and a composite modifier to obtain modified polypropylene master batches; and melting and extruding the modified polypropylene master batch to obtain a membrane, and carrying out two-way stretching on the membrane to obtain the automobile membrane. The automobile film not only has good heat insulation and hydrophobic effects, but also has good ultraviolet resistance and strong weather resistance.

A method for producing a fluorinated polymer which does not require an emulsifier as an essential component while an aqueous medium with little environmental burden is used. A method for producing a fluorinated polymer, which includes polymerizing a fluorinated monomer selected from tetrafluoroethylene, chlorotrifluoroethylene, and vinylidene fluoride, in an aqueous medium in the presence of a first polymer having units based on a compound represented by the formula: CXY═CR1-L-R2.

The application relates to a SFRJ fuel comprising metallic particles selected from the group consisting of boron carbide and aluminum particles; the metallic particles being encapsulated in a fluorinated coating which aids in combustion; wherein the fluorinated coating is selected from the group consisting of 1,1,1,3,3,3 hexafluoro-2-propanol, 2,2,2 trifluoroethanol, and 3-hydroxybenzotrifluoride.

The invention relates to a phosphorus-nitrogen synergistic acrylate monomer, a phosphorus-nitrogen-fluorine-containing polyacrylate water-repellent flame-retardant finishing agent and a preparation method of the phosphorus-nitrogen synergistic acrylate monomer and the phosphorus-nitrogen-fluorine-containing polyacrylate water-repellent flame-retardant finishing agent, the structure of the phosphorus-nitrogen synergistic acrylate monomer is shown as a formula (I), in the formula, R1 comprises any one of methoxyl, ethyoxyl, hydroxyl, phenyl, phenoxyl and spiro hydrocarbon; r2 comprises an alkylene group of C2-C6; and the DOPO is 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and the general formula of the DOPO is shown in the description. The phosphorus-nitrogen-fluorine-containing polyacrylate water-repellent flame-retardant finishing agent disclosed by the invention is prepared by reacting a phosphorus-nitrogen synergistic acrylate monomer with a fluorine-containing monomer, a crosslinking monomer and a soft monomer. The preparation method of the phosphorus-nitrogen synergistic acrylate monomer flame retardant is simple, halogen is not contained, the environment-friendly requirement is met, and the flame-retardant effect of a finishing agent is improved; meanwhile, the copolymer is formed in a grafting block form, so that the durability of the flame retardant is improved, and the functionality of the finishing agent and the chemical binding force of the finishing agent to a base material are also improved.

The disclosure provides a high-pressure gel polymer electrolyte and a preparation method thereof and a supercapacitor, and belongs to the technical field of supercapacitors. The preparation method comprises the following steps: adding a citric acid aqueous solution into polysaccharide powder and stirring to obtain a polysaccharide solution; adding nanocellulose whiskers into the polysaccharide solution and ultrasonically treating to form a modified polysaccharide composite solution; stirring a fluorinated monomer and a crosslinking agent to form a mixed system, adding a photoinitiator into the mixed system and stirring until the initiator is completely dissolved to obtain a monomer-crosslinking agent mixed solution; mixing the modified polysaccharide composite solution and the monomer-crosslinking agent mixed solution and stirring to form a composite precursor solution; soaking a substrate in a hydroxyl silane ethanol solution for surface modification, uniformly coating the composite precursor solution on the surface of the substrate, and performing crosslinking polymerization under ultraviolet radiation to obtain a gel film; drying the gel film, soaking the dried gel film in an electrolyte, and extruding to obtain the high-pressure gel polymer electrolyte.

The invention belongs to the technical field of new materials, and particularly relates to surface hyaluronic acid modified fluorine-containing silicone hydrogel as well as a preparation method and application of the surface hyaluronic acid modified fluorine-containing silicone hydrogel. By combining the hydrophilicity of the HEMA monomer and the high oxygen permeability and performance regulation and control effect of the fluorine-containing monomer TFEMA (trifluoroethyl methacrylate), the comprehensive performance of oxygen permeability, hydrophilicity and mechanical performance is synergistically improved. The hyaluronic acid coating on the surface of the hydrogel contact lens can improve the surface wettability and prolong the tear film rupture time, so that the wearing discomfort caused by poor surface wettability and the like of the traditional silicon hydrogel is avoided, and finally, a novel ophthalmic material with high comfort and low irritation is formed.

This invention relates to the field of polymer synthesis technology, specifically disclosing a fluorinated monomer, a fluorinated silicone rubber, and a method for preparing the same. The fluorinated monomer contains bonds in its structure or can be introduced into the structure of ethyl silicone rubber, thereby improving the rubber's aging resistance and mechanical properties. This invention also discloses the method of introducing a fluorinated monomer into the structure of ethyl silicone rubber to prepare a fluorinated silicone rubber with good aging resistance and mechanical properties.

An oxide-based solid-state secondary battery and a binder for a solid-state secondary battery using an oxide-based solid electrolyte that contains a fluorine-containing polymer including a vinylidene fluoride unit and a fluorinated monomer unit other than the vinylidene fluoride unit. The fluorinated monomer unit is at least one copolymerization unit (A) selected from a monomer unit having a structure represented by formula (1) and a monomer unit having a structure represented by formula (2):wherein Rf1 and Rf2 are each a linear or branched fluorinated alkyl or fluorinated alkoxy group with 1 to 12 carbon atoms, which optionally contains an oxygen atom between carbon-carbon atoms when the number of carbon atoms is 2 or more.

The invention provides a solid-state thermochromic hydrogel (10), wherein (A) the thermochromic (10) hydrogel comprises: 10-50 wt.% of water (1); and 50-90 wt.% of a copolymer (2), wherein the copolymer comprises an N,N-dimethylaminoethyl methacrylate moiety (21), a fluorinated monomer moiety (22), and a crosslinker moiety (23); and (B) the thermochromic hydrogel (10) has a transition temperature (TT) selected from the range of 24-40°, wherein the thermochromic hydrogel (10) is configured to be (i) transparent below the transition temperature (TT) and (ii) turbid at or above the transition temperature (TT).

The preparation method comprises the following steps: (S1) adding water and a fluorine-containing emulsifier into a reaction container, heating, introducing a gaseous unsaturated fluorine-containing monomer, boosting the pressure of the system, adding an initiator 1, carrying out a polymerization reaction, cooling, and reducing the pressure to obtain an emulsion A; and (S2) adding a liquid fluorine-containing unsaturated monomer and a fluorine-free unsaturated monomer into the emulsion A, standing until particles of the emulsion A are swelled, heating, adding an initiator 2, and carrying out a polymerization reaction to obtain an emulsion precursor of the water-based positive electrode binder. According to the invention, a seed emulsion polymerization technology is adopted, a plurality of polymeric monomers are introduced, and a series of water-based positive electrode binders are synthesized through swelling. The water-based positive electrode binder has a core-shell structure with adjustable size, adjustable shell copolymer content, good electrolyte affinity, excellent mechanical stability, chemical and electrochemical stability and wider temperature applicability, and can exert excellent binding performance at-20 DEG C to 60 DEG C.

The present invention discloses a method for preparing a fluorine-containing polymer and a composition thereof, the method comprising the step of aqueous emulsion polymerization of one or more fluorinated monomers, the aqueous emulsion polymerization being performed in the presence of at least one surfactant comprising a monophosphate ester, the monophosphate ester contains an aromatic phenol group of an alkyl chain substituent; the monophosphate does not contain methyl, methylene and methine which are directly connected with an aromatic ring group; the surfactant does not contain methine; the methylene content of the surfactant is lower than 20% in terms of carbon atom number. According to the preparation method of the fluorine-containing polymer, a PFAS substance is not used as a surfactant, so that the preparation method is environment-friendly.

The invention belongs to the technical field of fluorine-containing proton exchange membranes, and particularly discloses a preparation method of a fluorine-containing sulfonic acid resin functional material, which comprises the following steps: by taking a fluorine-containing methacrylate monomer A and a sulfonyl fluoride end group-containing monomer B as comonomers, pre-adding a solvent and the monomer B into a reactor, replacing until the oxygen content is qualified, heating to 40-80 DEG C, and reacting for 2-4 hours; and adding an initiator to initiate a polymerization reaction, and supplementing the comonomer in the reaction process to finally obtain the sulfonyl fluoride type fluorine-containing sulfonic acid resin. According to the fluorine-containing sulfonic acid resin, fluorine-containing methacrylate which is low in dangerousness is replaced, and the fluorine-containing sulfonic acid resin also comprises an acrylate monomer which is high in polymerization activity and a fluorine-containing monomer unit of a sulfonyl fluoride group, so that the reaction activity in a general solvent is improved, the machinability is improved, and the conductivity is high. Meanwhile, the polymerization method is high in polymerization speed, high in product molecular weight, low in risk and easy to control.

The present invention related to the field of sustainable chemicals production and particularly the bio-based production of fluorinated building blocks as a sustainable alternative to traditional petroleum-derived chemical synthesis processes. The present invention provides a chemical precursor and monomer comprising 2-fluoroadipic acid (2FAA), a polymer comprising fluorinated polyamide 66 and polyamide 46 and a method for producing said precursor, monomer and polymer.

This invention discloses a polyvinyl fluoride (PVC) film, characterized in that: the film-forming formula of the PVC film comprises 100 parts of PVC resin and 0.5-2 parts of a nucleating agent; the PVC resin is selected from at least one of PVC homopolymer or copolymer of PVC and other fluorinated monomers, the PVC resin has a weight-average molecular weight of 450,000-1,200,000, a molecular weight distribution of 1.1-2.0, a crystallinity of 40%-60%, and a crystal size of 4.0-10.0 nm; the nano-nucleating agent is inorganic nanoparticles with a particle size of 1-60 nm and a specific surface area of ​​10-800 m². 2 / g. The polyvinyl fluoride film of the present invention has excellent weather resistance, tear resistance and helium barrier properties, and can be used as a protective layer or barrier layer for aircraft composite materials, thereby effectively extending the service life of aircraft.

The invention belongs to the technical field of resin catalyst preparation, and relates to a resin catalyst for bisphenol A to remove p-hydroxybenzenesulfonic acid and a preparation method thereof. According to the preparation method, a novel functional resin catalyst is developed, firstly, a fluorine-containing monomer dodecafluoroheptyl methacrylate is introduced into a styrene-divinyl benzene copolymerization skeleton, and the chemical adsorption capacity on p-hydroxybenzenesulfonic acid is remarkably improved by utilizing the strong electronegativity of fluorine atoms; meanwhile, non-specific adsorption of bisphenol A molecules can be reduced due to the hydrophobic property of the fluorocarbon chain, and selective deacidification is achieved; secondly, a specially-made polyethylene glycol-polysiloxane block copolymer is adopted as a dispersing agent, a resin structure with the pore size distribution concentrated in 5-20 nm is obtained by accurately regulating and controlling the interfacial tension in the polymerization process, efficient diffusion of p-hydroxybenzenesulfonic acid molecules is guaranteed, and entry of bisphenol A dimers is effectively blocked. And an efficient, environment-friendly and economical purification solution is provided for industrial production of bisphenol A.

The invention belongs to the technical field of battery materials, and relates to a carbon-coated foil and a preparation method and application thereof.The carbon-coated foil comprises a metal foil and a carbon-coated layer arranged on the surface of at least one side of the metal foil, and the carbon-coated layer at least comprises a conductive carbon material, a first binder and a second binder; wherein the first binder is polyacrylic acid; the second binder is a high-molecular interface reinforcing agent, and adopted polymeric monomers at least comprise a fluorinated monomer, a reactive monomer and a rigid monomer. According to the carbon-coated foil provided by the invention, on the basis of retaining strong adhesive force of the PAA carbon-coated layer and the current collector, the interface bonding strength of the carbon-coated layer and the PVDF positive electrode layer is effectively improved, and the electrochemical performance and the cycle performance of the battery are remarkably improved.

The present disclosure relates to a composite membrane (CF) having a thickness of less than 0.10 mm and comprising:-a fibrous fabric (FF) selected from glass or quartz fibrous fabrics; -a composition comprising at least one fluoropolymer (FP) applied to the surface of the fibrous fabric (FF); wherein the fluoropolymer (FP) comprises:-recurring units derived from tetrafluoroethylene (RTFE); -a repeating unit (RF) derived from a fluoromonomer (F) selected from the group consisting of perfluoro (alkyl vinyl ether) (PAVE), hexafluoropropylene (HFP) and a combination of two or more of said monomers; -repeating units (RM) derived from at least one monomer (M) selected from the group consisting of (i) monomers comprising a functional group (FG) selected from the group consisting of hydroxyl groups, isocyanate groups, carboxylic acid groups and anhydride groups, (ii) chlorotrifluoroethylene (CTFE) and (iii) dichlorodifluoroethylene (R1112); having the following proportions, expressed in mol%:-(RTFE): at least 75.0 mol%; -(RF): between 0 and 20.0 mol%; -(RM): between 0.01 and 5.0 mol%; these proportions in mol% are based on the total number of moles of repeating units of the fluoropolymer (FP).

Provided is an electrode mixture that is an electrode mixture containing a lithium-containing transition metal oxide, a conductive aid, a binder, and an organic solvent, wherein the conductive aid contains a nano-carbon material, the nano-carbon material is at least one selected from the group consisting of a multi-walled carbon nanotube, a carbon nanohorn, a carbon nanofiber, a fullerene, and graphene, the binder contains a fluorine-containing copolymer containing a vinylidene fluoride unit and a fluorinated monomer unit (excluding the vinylidene fluoride unit), and the content of the vinylidene fluoride unit in the fluorine-containing copolymer is more than 50 mol% and 99 mol% or less with respect to the total monomer units.

Provided is an electrode mixture containing an electrode active material, an organic solvent, a binder, and an additive, the binder including a fluorine-containing copolymer containing a vinylidene fluoride unit and a fluorinated monomer unit (excluding the vinylidene fluoride unit), the additive being a polymer material having the following repeating unit: -[CH2-CHR]- (in the repeating unit, R represents a chain or cyclic amide group, a nitrile group, or a substituent which is an alkyl group having 1 to 4 carbon atoms and in which at least one hydrogen atom of the alkyl group is replaced with a chain or cyclic amide group or a nitrile group), the content of the binder being 0.1 to 1.6 parts by mass per 100 parts by mass of the electrode active material, and the content of the additive being 0.001 to 0.2 parts by mass per 100 parts by mass of the electrode active material.