Non-aqueous liquid composition for fabricating an electrochemical device, method for manufacturing an electrode, method for manufacturing an electrochemical device, and electrode

Abstract

To provide a liquid composition for production of an electrochemical device, which is superior in storage stability and discharge stability.SOLUTION: A liquid composition for production of an electrochemical device comprises at least one of an active material and an electrolyte, a dispersion medium, and a polymer. The polymer has a constituting unit including: a group represented by the following general formula (I) (where X is an oxygen atom or a carbon atom subjected to substitution with a hydrogen atom or alkyl group, R1, R2, R3 and R4 are independently a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted cycloalkyl group, and m and n are each a positive integer); and an amide bond and / or imide bond.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a liquid composition for manufacturing an electrochemical element, a method for manufacturing an electrode, a method for manufacturing an electrochemical element, and an electrode.

Background Art

[0002] Electrochemical elements such as lithium ion secondary batteries are mounted on portable devices, hybrid automobiles, electric automobiles, etc., and the demand is expanding. In addition, the need for thin batteries mounted on various wearable devices and medical patches is increasing, and the requirements for electrochemical elements are diversifying.

[0003] Conventionally, as a method for manufacturing an electrode constituting an electrochemical element, a method of forming an electrode mixture layer on an electrode substrate by applying a liquid composition using a die coater, comma coater, reverse roll coater, etc. is known.

[0004] The liquid composition generally contains an active material, a dispersion medium, and a binder. However, since the binder is dissolved in the dispersion medium, the viscosity at 25°C is several thousand to several tens of thousands of mPa·s.

[0005] On the other hand, a method of forming an electrode mixture layer on an electrode substrate using a liquid composition that can be discharged by a liquid discharge method is known (for example, see Patent Document 1).

[0006] The liquid discharge method is a method of discharging fine droplets of a liquid composition from a discharge hole of a liquid discharge head. As a method of discharging droplets from the liquid discharge head, a piezo method, a thermal method, a valve method, etc. are known. Among these, the piezo method can accurately control the discharge amount of the liquid composition by controlling the voltage. In addition, since it does not require heating, it is less affected by the use environment and has high durability.

Summary of the Invention

Problems to be Solved by the Invention

[0007] A liquid composition that can be discharged by a liquid discharge method generally has a viscosity of several to several hundred mPa·s at 25°C from the viewpoints of storage stability and discharge stability, and thus needs to be lower than the viscosity of a conventional liquid composition at 25°C. In particular, when using a piezo-type liquid discharge head, it is necessary to adjust the viscosity and surface tension of the liquid composition to appropriate values in order to improve discharge stability.

[0008] In order to reduce the viscosity of the liquid composition, it is conceivable to reduce the content of the binder.

[0009] However, since the binder is added to bind the active material to the electrode substrate and the active materials to each other, it is necessary to add a certain amount of binder to the active material. Also, in obtaining a liquid composition that can be discharged by a liquid discharge method, it is important to improve the degree of freedom in the selection of materials such as the dispersion medium from the viewpoints of reducing environmental impact and optimizing the process.

[0010] One aspect of the present invention aims to provide a liquid composition for manufacturing an electrochemical element that is excellent in storage stability and discharge stability.

Means for Solving the Problems

[0011] One aspect of the liquid composition for manufacturing an electrochemical element according to the present invention contains at least one of an active material and an electrolyte, a dispersion medium, and a polymer. The polymer has the general formula (I)

[0012]

Chemical Formula

Advantages of the Invention

[0013] According to one aspect of the present invention, it is possible to provide a liquid composition for manufacturing an electrochemical element, which is excellent in storage stability and discharge stability.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0015] Hereinafter, modes for carrying out the present invention will be described with reference to the drawings. In addition, the same components may be denoted by the same reference numerals, and the description thereof may be omitted.

[0016] <Liquid Composition for Manufacturing Electrochemical Element> The liquid composition for manufacturing an electrochemical element of the present embodiment includes at least one of an active material and an electrolyte, a dispersion medium, and a polymer, and may further include a conductive auxiliary agent, a dispersant, etc. as necessary. The liquid composition for manufacturing an electrochemical element of the present embodiment preferably includes an active material, a dispersion medium, and a polymer.

[0017] The viscosity at 25°C of the liquid composition for manufacturing an electrochemical element according to the present embodiment is preferably 200 mPa·s or less, and more preferably 50 mPa·s or less. When the viscosity at 25°C of the liquid composition for manufacturing an electrochemical element according to the present embodiment is 200 mPa·s or less, the discharge stability of the liquid composition for manufacturing an electrochemical element is improved.

[0018] Note that the lower limit of the viscosity at 25°C of the liquid composition for manufacturing an electrochemical element according to the present embodiment is not particularly limited, but is usually 10 mPa·s.

[0019] The liquid composition for manufacturing an electrochemical element according to the present embodiment can be produced by dissolving or dispersing a composition containing at least one of an active material and an electrolyte and a polymer in a dispersion medium.

[0020] Here, the liquid composition for manufacturing an electrochemical element according to the present embodiment can be used for manufacturing an electrode of an electrochemical element.

[0021] The electrochemical element is not particularly limited as long as it can store electricity, and examples thereof include secondary batteries and capacitors.

[0022] [Active material] As the active material, a positive electrode active material or a negative electrode active material applicable to an electrochemical element can be used.

[0023] The positive electrode active material is not particularly limited as long as it can reversibly occlude and release alkali metal ions, and an alkali metal-containing transition metal compound can be used.

[0024] Examples of the alkali metal-containing transition metal compound include lithium-containing transition metal compounds such as composite oxides containing one or more elements selected from the group consisting of cobalt, manganese, nickel, chromium, iron, and vanadium and lithium.

[0025] Examples of the lithium-containing transition metal compound include lithium cobaltate, lithium nickelate, lithium manganate, and the like.

[0026] As the alkali metal-containing transition metal compound, polyanion compounds having XO4 tetrahedrons (X = P, S, As, Mo, W, Si, etc.) in the crystal structure can also be used. Among these, lithium-containing transition metal phosphate compounds such as lithium iron phosphate and lithium vanadium phosphate are preferable in terms of cycle characteristics, and lithium vanadium phosphate is particularly preferable in terms of lithium diffusion coefficient and input / output characteristics of the electrochemical device.

[0027] In addition, in terms of electron conductivity, it is preferable that the surface of the polyanion compound is coated and complexed with a conductive aid such as a carbon material.

[0028] The negative electrode active material is not particularly limited as long as it can reversibly occlude and release alkali metal ions, but a carbon material containing graphite having a graphite-type crystal structure can be used.

[0029] Examples of the carbon material include natural graphite, artificial graphite, non-graphitizable carbon (hard carbon), graphitizable carbon (soft carbon), and the like.

[0030] Examples of the negative electrode active material other than the carbon material include lithium titanate, titanium oxide, and the like.

[0031] In addition, from the viewpoint of the energy density of the electrochemical device, it is preferable to use a high-capacity material such as silicon, tin, silicon alloy, tin alloy, silicon oxide, silicon nitride, or tin oxide as the negative electrode active material.

[0032] When the active material contains lithium, the dispersion medium is preferably a non-aqueous dispersion medium. In this case, the water content in the liquid composition for producing an electrochemical element of the present embodiment is preferably 5% by mass or less, and more preferably 1% by mass or less. When the water content in the liquid composition for producing an electrochemical element of the present embodiment is 5% by mass or less, it is possible to suppress lithium contained in the active material from reacting with water to form a compound such as lithium carbonate and reducing the discharge capacity of the electrochemical element. Further, it is possible to suppress the decomposition of a compound such as lithium carbonate and the generation of gas during charge and discharge of the electrochemical element.

[0033] The mode diameter of the active material is preferably 3 μm or less, and more preferably 1 μm or less. When the mode diameter of the active material is 3 μm or less, the discharge stability and storage stability of the liquid composition for producing an electrochemical element of the present embodiment are improved.

[0034] The 10% diameter (D 10 ) of the active material is preferably 0.1 μm or more, and more preferably 0.15 μm or more. When D 10 of the active material is 0.1 μm or more, the storage stability of the liquid composition for producing an electrochemical element of the present embodiment is improved.

[0035] The content of the active material in the liquid composition for producing an electrochemical element of the present embodiment is preferably 10% by mass or more, and more preferably 15% by mass or more. When the content of the active material in the liquid composition for producing an electrochemical element of the present embodiment is 10% by mass or more, the number of printing times required to form an electrode composite layer with a predetermined basis weight is reduced.

[0036] [Electrolyte] As the electrolyte, an aqueous electrolyte solution or a non-aqueous electrolyte can be used. As the electrolyte, an electrolyte used in an electrochemical element described later can be used. Details of the electrolyte will be described later.

[0037] [Dispersion medium] The dispersion medium is not particularly limited as long as it can dissolve the polymer and disperse the active material. Examples include ethylene glycol, propylene glycol, N-methyl-2-pyrrolidone, cyclohexanone, acetate ester, mesitylene, 2-n-butoxymethanol, 2-dimethylethanol, N,N-dimethylacetamide, N,N-dimethylformamide, dimethyl sulfoxide, lactate ester, tetramethylurea, anisole, dibutyl ether, 1,2-diethoxyethane, etc., and two or more of them may be used in combination.

[0038] [Polymer] The polymer has the following general formula (I):

[0039] [Chemical formula] (In the formula, X is an oxygen atom, or a carbon atom substituted with a hydrogen atom or an alkyl group, and R 1 , R 2 , R 3 and R 4 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted cycloalkyl group, and m and n are positive integers.) It has a structural unit containing a group represented by the formula and an amide bond and / or an imide bond.

[0040] The polymer has the following general formula (II):

[0041] [Chemical formula] (In the formula, R 1 , R 2 , R 3 and R 4 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted cycloalkyl group, and n is a positive integer.) It is preferable for improving the solubility of the polymer and the dispersibility of the active material that the polymer has a structural unit containing a group represented by the formula and an amide bond and / or an imide bond.

[0042] R 1 、R 2 、R 3 and R 4 The substituted or unsubstituted alkyl group in R

[0043] Note that the alkyl group may be either straight-chain or branched-chain.

[0044] Examples of the alkyl group having 1 to 30 carbon atoms include methyl group, ethyl group, propyl group, butyl group, isopropyl group, isobutyl group, pentyl group, hexyl group, heptyl group, ethylhexyl group, octyl group, decyl group, dodecyl group, 2-butyloctyl group, octadecyl group and the like.

[0045] R 1 、R 2 、R 3 and R 4 The substituted or unsubstituted cycloalkyl group in R

[0046] Note that the cycloalkyl group may be either monocyclic or polycyclic.

[0047] Examples of the cycloalkyl group having 3 to 30 carbon atoms include cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, adamantyl group and the like.

[0048] R 1 、R 2 、R 3 and R 4 Examples of the substituent in R

[0049] These substituents may be introduced in plural with the same group or different groups.

[0050] Examples of substituents other than those described above include an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, and a phenyl group substituted with an alkoxy group having 1 to 12 carbon atoms.

[0051] The above polymer is obtained by a reaction of a diamine with a carboxylic acid derivative such as a carboxylic acid chloride or a carboxylic acid anhydride, or a reaction of a diisocyanate with a carboxylic acid or an acid anhydride. As an example, there is a reaction of trimellitic anhydride chloride and a diamine as follows, and by such a method, a polymer having a structural unit containing an amide bond and / or an imide bond can be obtained.

[0052]

Chemical formula

[0053] Furthermore, in the present embodiment, a substituent represented by the general formula (I) is introduced into the polymer. It functions as a binder having excellent solubility and excellent binding properties to an active material, a solid electrolyte, etc.

[0054] The mass ratio of the polymer to the active material is preferably 1 to 10%, more preferably 1 to 5%, and even more preferably 1 to 3%. When the mass ratio of the polymer to the active material is 1% or more, the binding property between the active materials or between the active material and the electrode substrate is improved. When it is 5% or less, the internal resistance of the electrochemical element is lowered, so that the input / output characteristics of the electrochemical element are improved.

[0055] [Conductive assistant] As the conductive assistant, for example, carbon materials such as conductive carbon black, carbon nanofibers, carbon nanotubes, graphene, and graphite particles can be used.

[0056] Conductive carbon black can be produced by the furnace method, acetylene method, gasification method, etc.

[0057] As conductive aids other than carbon materials, metal particles such as aluminum and metal fibers can be used.

[0058] The mass ratio of the conductive aid to the active material is preferably 10% or less, and more preferably 8% or less. When the mass ratio of the conductive aid to the active material is 10% or less, the storage stability of the liquid composition for producing an electrochemical element of the present embodiment is improved.

[0059] Here, as described above, the conductive aid may be complexed with the active material.

[0060] [Dispersant] The dispersant is not particularly limited as long as it can improve the dispersibility of the active material and the conductive aid in the dispersion medium. For example, polymer type dispersants such as polycarboxylic acid based dispersants, naphthalenesulfonic acid formalin condensation based dispersants, polyethylene glycol based dispersants, polycarboxylic acid partial alkyl ester based dispersants, polyether based dispersants, polyalkylene polyamine based dispersants, surfactant type dispersants such as alkylsulfonic acid based dispersants, quaternary ammonium salt based dispersants, higher alcohol alkylene oxide based dispersants, polyhydric alcohol ester based dispersants, alkyl polyamine based dispersants, and inorganic type dispersants such as polyphosphate based dispersants can be mentioned, and two or more kinds may be used in combination.

[0061] <Method for manufacturing an electrode> The method for manufacturing the electrode of the present embodiment includes a step of applying the liquid composition for producing an electrochemical element of the present embodiment onto an electrode substrate, and preferably includes a step of discharging the liquid composition for producing an electrochemical element of the present embodiment onto the electrode substrate.

[0062] The material constituting the electrode substrate (current collector) is not particularly limited as long as it has conductivity and is stable with respect to the applied potential.

[0063] The method for manufacturing the electrode of the present embodiment preferably further includes a step of pressurizing the electrode substrate onto which the liquid composition has been discharged. Thereby, the components constituting the electrode mixture layer are less likely to peel off, and the reliability of the electrochemical element is improved.

[0064] [Negative electrode] FIG. 1 shows an example of the negative electrode of the present embodiment.

[0065] The negative electrode 10 has a negative electrode mixture layer 12 containing a negative electrode active material and a polymer formed on one side of the negative electrode substrate 11.

[0066] Note that the negative electrode mixture layer 12 may be formed on both sides of the negative electrode substrate 11.

[0067] The shape of the negative electrode 10 is not particularly limited, and examples include a flat plate shape and the like.

[0068] Examples of the material constituting the negative electrode substrate 11 include stainless steel, nickel, aluminum, copper, and the like.

[0069] [Method for manufacturing negative electrode] FIG. 2 shows an example of the method for manufacturing the negative electrode of the present embodiment.

[0070] The method for manufacturing the negative electrode 10 includes a step of discharging a liquid composition 12A, which is a liquid composition for manufacturing an electrochemical element of the present embodiment, onto the negative electrode substrate 11 using a liquid discharge device 300.

[0071] Here, the liquid composition 12A contains a negative electrode active material, a dispersion medium, and a polymer.

[0072] The liquid composition 12A is stored in a tank 307 and supplied from the tank 307 to a liquid discharge head 306 via a tube 308.

[0073] In addition, the liquid discharge device 300 may be provided with a mechanism for capping the nozzle to prevent drying when the liquid composition 12A is not being discharged from the liquid discharge head 306.

[0074] When manufacturing the negative electrode 10, after placing the negative electrode substrate 11 on the heatable stage 400, droplets of the liquid composition 12A are discharged onto the negative electrode substrate 11 and then heated. At this time, the stage 400 may move or the liquid discharge head 306 may move.

[0075] Also, when heating the liquid composition 12A discharged onto the negative electrode substrate 11, it may be heated by the stage 400 or by a heating mechanism other than the stage 400.

[0076] The heating mechanism is not particularly limited as long as it does not directly contact the liquid composition 12A, and examples include a resistance heater, an infrared heater, a fan heater, etc.

[0077] Note that a plurality of heating mechanisms may be provided.

[0078] The heating temperature is not particularly limited as long as it can volatilize the dispersion medium, and from the viewpoint of power consumption, it is preferably in the range of 70 to 150°C.

[0079] Also, when heating the liquid composition 12A discharged onto the negative electrode substrate 11, ultraviolet light may be irradiated.

[0080] FIG. 3 shows another example of the method for manufacturing the negative electrode of the present embodiment.

[0081] The method for manufacturing the negative electrode 10 includes a step of discharging the liquid composition 12A onto the negative electrode substrate 11 using the liquid discharge device 300.

[0082] First, prepare an elongated negative electrode substrate 11. Then, wind the negative electrode substrate 11 around a cylindrical core and set it on the feeding roller 304 and the winding roller 305 so that the side where the negative electrode composite layer 12 is formed is on the upper side in the figure. Here, the feeding roller 304 and the winding roller 305 rotate counterclockwise, and the negative electrode substrate 11 is conveyed in the direction from right to left in the figure. Then, droplets of the liquid composition 12A are discharged onto the conveyed negative electrode substrate 11 from the liquid discharge head 306 installed above the negative electrode substrate 11 between the feeding roller 304 and the winding roller 305. The droplets of the liquid composition 12A are discharged so as to cover at least a part of the negative electrode substrate 11.

[0083] Note that a plurality of liquid discharge heads 306 may be installed in a direction substantially parallel or substantially perpendicular to the conveyance direction of the negative electrode substrate 11.

[0084] Next, the negative electrode substrate 11 onto which the liquid composition 12A has been discharged is conveyed to the heating mechanism 309 by the feeding roller 304 and the winding roller 305. As a result, the dispersion medium contained in the liquid composition 12A on the negative electrode substrate 11 volatilizes to form the negative electrode composite layer 12, and the negative electrode 10 is obtained. Thereafter, the negative electrode 10 is cut into a desired size by punching or the like.

[0085] The heating mechanism 309 is not particularly limited as long as it does not directly contact the liquid composition 12A, and examples thereof include a resistance heating heater, an infrared heater, and a fan heater.

[0086] Note that the heating mechanism 309 may be installed on either the upper or lower side of the negative electrode substrate 11, or a plurality of heating mechanisms 309 may be installed.

[0087] The heating temperature is not particularly limited as long as it can volatilize the dispersion medium, and from the viewpoint of power consumption, it is preferably in the range of 70 to 150°C.

[0088] Also, when heating the liquid composition 12A discharged onto the negative electrode substrate 11, ultraviolet light may be irradiated.

[0089] FIG. 4 shows a modified example of the liquid discharge device 300.

[0090] The liquid discharge device 300' can circulate the liquid composition 12A through the liquid discharge head 306, the tank 307, and the tube 308 by controlling the pump 310 and the valves 311, 312.

[0091] In addition, the liquid discharge device 300' is provided with an external tank 313, and when the liquid composition 12A in the tank 307 decreases, the liquid composition 12A can be supplied from the external tank 313 to the tank 307 by controlling the pump 310 and the valves 311, 312, 314.

[0092] When the liquid discharge devices 300 and 300' are used, the liquid composition 12A can be discharged to the target position of the negative electrode substrate 11. Further, when the liquid discharge devices 300 and 300' are used, the surfaces of the negative electrode substrate 11 and the negative electrode composite material layer 12 that are in contact with each other can be bonded. Furthermore, when the liquid discharge devices 300 and 300' are used, the thickness of the negative electrode composite material layer 12 can be made uniform.

[0093] [Positive Electrode] FIG. 5 shows an example of the positive electrode of the present embodiment.

[0094] The positive electrode 20 has a positive electrode composite material layer 22 containing a positive electrode active material and a polymer formed on one side of the positive electrode substrate 21.

[0095] Note that the positive electrode composite material layer 22 may be formed on both sides of the positive electrode substrate 21.

[0096] The shape of the positive electrode 20 is not particularly limited, and examples thereof include a flat plate shape.

[0097] Examples of the material constituting the positive electrode substrate 21 include stainless steel, aluminum, titanium, tantalum, and the like.

[0098] [Method for Manufacturing Positive Electrode] The method for manufacturing the positive electrode 20 is the same as the method for manufacturing the negative electrode 10, except that a liquid composition is discharged onto the positive electrode substrate 21.

[0099] Here, the liquid composition contains a positive electrode active material, a dispersion medium, and a polymer, and may contain an electrolyte component.

[0100] <Method for manufacturing an electrochemical device> The method for manufacturing the electrochemical device according to the present embodiment includes a step of manufacturing an electrode using the method for manufacturing the electrode according to the present embodiment.

[0101] [Electrode element] FIG. 6 shows an example of an electrode element constituting the electrochemical device according to the present embodiment.

[0102] In the electrode element 40, the negative electrode 15 and the positive electrode 25 are laminated via a separator 30. Here, the positive electrode 25 is laminated on both sides of the negative electrode 15. Further, a lead wire 41 is connected to the negative electrode substrate 11, and a lead wire 42 is connected to the positive electrode substrate 21.

[0103] The negative electrode 15 is the same as the negative electrode 10, except that negative electrode composite layers 12 are formed on both surfaces of the negative electrode substrate 11.

[0104] The positive electrode 25 is the same as the positive electrode 20, except that positive electrode composite layers 22 are formed on both surfaces of the positive electrode substrate 21.

[0105] Note that the number of laminations of the negative electrode 15 and the positive electrode 25 in the electrode element 40 is not particularly limited.

[0106] Also, the number of negative electrodes 15 and the number of positive electrodes 25 in the electrode element 40 may be the same or different.

[0107] (Separator) The separator 30 is provided between the negative electrode 15 and the positive electrode 25 in order to prevent a short circuit between the negative electrode 15 and the positive electrode 25.

[0108] Examples of the separator 30 include papers such as kraft paper, vinylon mixed paper, and synthetic pulp mixed paper, cellophane, polyethylene graft membranes, polyolefin non-woven fabrics such as polypropylene melt blown non-woven fabrics, polyamide non-woven fabrics, glass fiber non-woven fabrics, microporous membranes, and the like.

[0109] The size of the separator 30 is not particularly limited as long as it can be used in the electrochemical element.

[0110] The separator 30 may have a single-layer structure or a laminated structure.

[0111] When using a solid electrolyte, the separator 30 can be omitted.

[0112] <Electrochemical element> FIG. 7 shows a secondary battery as an example of the electrochemical element of the present embodiment.

[0113] In the secondary battery 1, an electrolyte layer 51 is formed by injecting an aqueous electrolyte solution or a non-aqueous electrolyte into the electrode element 40, and it is sealed by an exterior 52. In the secondary battery 1, the lead wires 41 and 42 are drawn out to the outside of the exterior 52.

[0114] The secondary battery 1 may have other members as necessary.

[0115] There is no particular limitation on the secondary battery 1, and examples include lithium ion secondary batteries and the like.

[0116] The shape of the secondary battery 1 is not particularly limited, and examples include a laminate type, a cylinder type in which a sheet electrode and a separator are spiral, a cylinder type of an inside-out structure in which a pellet electrode and a separator are combined, and a coin type in which a pellet electrode and a separator are laminated.

[0117] [Electrolyte] As the electrolyte, an aqueous electrolyte solution or a non-aqueous electrolyte can be used.

[0118] (Aqueous electrolyte solution) Examples of the electrolyte salt constituting the aqueous electrolyte solution include sodium hydroxide, potassium hydroxide, sodium chloride, potassium chloride, ammonium chloride, zinc chloride, zinc acetate, zinc bromide, zinc iodide, zinc tartrate, zinc perchloride, and the like.

[0119] (Non-aqueous electrolyte) As the non-aqueous electrolyte, a non-aqueous electrolyte solution or a solid electrolyte can be used.

[0120] ((Non-aqueous electrolyte solution)) The non-aqueous electrolyte solution is an electrolyte solution in which an electrolyte salt is dissolved in a non-aqueous solvent.

[0121] -Electrolyte salt- There is no particular limitation on the electrolyte salt as long as it has high ionic conductivity and can be dissolved in a non-aqueous solvent.

[0122] The electrolyte salt preferably contains a halogen atom.

[0123] Examples of the cation constituting the electrolyte salt include lithium ions and the like.

[0124] Examples of the anion constituting the electrolyte salt include BF4 - , PF6 - , AsF6 - , CF3SO3 - , (CF3SO2)2N - , (C2F5SO2)2N - and the like.

[0125] The lithium salt is not particularly limited and can be appropriately selected according to the purpose. For example, lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium hexafluoroarsenate (LiAsF6), lithium trifluoromethanesulfonate (LiCF3SO3), lithium bis(trifluoromethylsulfonyl)imide (LiN(CF3SO2)2), lithium bis(pentafluoroethylsulfonyl)imide (LiN(C2F5SO2)2), etc. can be mentioned. Among these, LiPF6 is preferable from the viewpoint of ionic conductivity, and LiBF4 is preferable from the viewpoint of stability.

[0126] In addition, the electrolyte salt may be used alone or in combination of two or more.

[0127] The concentration of the electrolyte salt in the non-aqueous electrolyte can be appropriately selected according to the purpose. However, when the non-aqueous energy storage element is of the swing type, it is preferably 1 mol / L to 2 mol / L, and when the non-aqueous energy storage element is of the reserve type, it is preferably 2 mol / L to 4 mol / L.

[0128] -Non-aqueous solvent- The non-aqueous solvent is not particularly limited. For example, it is preferable to use an aprotic organic solvent.

[0129] As the aprotic organic solvent, carbonate-based organic solvents such as chain carbonates and cyclic carbonates can be used. Among these, chain carbonates are preferable from the viewpoint of high dissolving power of the electrolyte salt.

[0130] Also, the aprotic organic solvent preferably has a low viscosity.

[0131] Examples of the chain carbonate include dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), etc.

[0132] The content of the chain carbonate in the non-aqueous solvent is preferably 50% by mass or more. When the content of the chain carbonate in the non-aqueous solvent is 50% by mass or more, even if the non-aqueous solvent other than the chain carbonate is a cyclic substance (e.g., cyclic carbonate, cyclic ester) with a high dielectric constant, the content of the cyclic substance decreases. For this reason, even when preparing a non-aqueous electrolyte with a high concentration of 2M or more, the viscosity of the non-aqueous electrolyte becomes low, and the penetration of the non-aqueous electrolyte into the electrode and ion diffusion become good.

[0133] Examples of the cyclic carbonate include propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), vinylene carbonate (VC), and the like.

[0134] In addition, as the non-aqueous solvent other than the carbonate-based organic solvent, for example, ester-based organic solvents such as cyclic esters and chain esters, ether-based organic solvents such as cyclic ethers and chain ethers, and the like can be used.

[0135] Examples of the cyclic ester include γ-butyrolactone (γBL), 2-methyl-γ-butyrolactone, acetyl-γ-butyrolactone, γ-valerolactone, and the like.

[0136] Examples of the chain ester include alkyl propionate, dialkyl malonate, alkyl acetate (e.g., methyl acetate (MA), ethyl acetate), alkyl formate (e.g., methyl formate (MF), ethyl formate), and the like.

[0137] Examples of the cyclic ether include tetrahydrofuran, alkyltetrahydrofuran, alkoxytetrahydrofuran, dialkoxytetrahydrofuran, 1,3-dioxolane, alkyl-1,3-dioxolane, 1,4-dioxolane, and the like.

[0138] Examples of the chain ether include 1,2 - dimethoxyethane (DME), diethyl ether, ethylene glycol dialkyl ether, diethylene glycol dialkyl ether, triethylene glycol dialkyl ether, tetraethylene glycol dialkyl ether, and the like.

[0139] ((Solid electrolyte)) The solid electrolyte has the property of withstanding high voltages, has electron insulation, and exhibits ionic conductivity. As the material constituting the solid electrolyte layer, there is no particular limitation as long as it is a solid substance having electron insulation and exhibiting ionic conductivity, and any material can be appropriately used. As the material constituting the solid electrolyte layer, a sulfide - based solid electrolyte or an oxide - based solid electrolyte is preferable from the viewpoint of having high ionic conductivity.

[0140] Examples of the sulfide - based solid electrolyte include Li 10 GeP2S 12 or Li6PS5X (X is F, Cl, Br, or I) having an argyrodite - type crystal structure, and the like.

[0141] Examples of the oxide - based solid electrolyte include LLZ (Li7La3Zr2O 12 ) having a garnet - type crystal structure or LATP (Li 1+X Al X Ti20 X (PO4)3) (0.1 ≦ X ≦ 0.4) having a NASICON - type crystal structure, LLT (Li 0.33 La 0.55 TiO3) having a perovskite - type crystal structure, amorphous LIPON (Li 2.9 PO 3.3 N 0.4 ), and the like. These solid electrolytes may be used alone or in combination of two or more.

[0142] As electrolyte materials to be dissolved or dispersed in a liquid to form these solid electrolyte layers, for example, Li2S, P2S5, LiCl, etc. which are precursors of solid electrolytes, Li2S-P2S5-based glass which is a material of solid electrolyte, Li7P3S 11 glass ceramics, etc. can be mentioned.

[0143] Also, a material for forming a gel electrolyte layer can be used as the electrolyte.

[0144] There is no particular limitation on the gel electrolyte as long as it exhibits ionic conductivity. For example, as polymers constituting the network structure of the gel electrolyte, polyethylene oxide, polypropylene oxide, polyacrylonitrile, polymethyl methacrylate, polyvinyl chloride, a copolymer of vinylidene fluoride and hexafluoropropylene, polyethylene carbonate, etc. can be mentioned.

[0145] Examples of solvent molecules retained in the gel electrolyte include ionic liquids. Examples of ionic liquids include methyl-1-propylpyrrolidinium bis(fluorosulfonylimide), 1-butyl-1-methylpyrrolidinium bis(fluorosulfonylimide), 1-methyl-1-propylpiperidinium bis(fluorosulfonylimide), 1-ethyl-3-methylimidazolium bis(fluorosulfonylimide), 1-methyl-3-propylimidazolium bis(fluorosulfonylimide), N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(fluorosulfonyl)imide.

[0146] Also, as the ionic liquid, a mixture of a liquid such as tetraglyme, propylene carbonate, fluoroethylene carbonate, ethylene carbonate, diethyl carbonate, etc. and a lithium salt may be used.

[0147] The lithium salt is not particularly limited and can be appropriately selected according to the purpose. For example, lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium hexafluoroarsenate (LiAsF6), lithium trifluoromethanesulfonate (LiCF3SO3), lithium bis(trifluoromethylsulfonyl)imide (LiN(CF3SO2)2), lithium bis(pentafluoroethylsulfonyl)imide (LiN(C2F5SO2)2), etc. can be mentioned.

[0148] In addition, these ionic liquids and lithium salts contained in the gel electrolyte may be used alone or in combination of two or more.

[0149] To form these gel electrolyte layers, as the electrolyte material dissolved or dispersed in a liquid, a solution in which the above polymer compound and an ionic liquid or a lithium salt are dissolved may be used. Further, as the electrolyte material dissolved or dispersed in a liquid, a material that is a precursor of the gel electrolyte (for example, a combination of polyethylene oxide or polypropylene oxide having acrylate groups at both ends and a solution in which an ionic liquid or a lithium salt is dissolved) may be used.

[0150] When using these solid electrolytes and gel electrolytes, they can be used as a liquid composition together with the active material.

[0151] (Use of the electrochemical device) The use of the electrochemical device is not particularly limited. For example, notebook computers, pen input computers, mobile computers, e-book players, mobile phones, mobile faxes, mobile copiers, mobile printers, headphone stereos, video movies, liquid crystal TVs, handy cleaners, portable CDs, mini discs, transceivers, electronic notebooks, calculators, memory cards, portable tape recorders, radios, backup power supplies, motors, lighting fixtures, toys, game devices, watches, strobes, cameras, etc. can be mentioned.

Example

[0152] Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the embodiments.

[0153] The particle size distribution of the active material, the viscosity and the particle size distribution of the liquid composition for manufacturing the electrochemical element were measured by the following methods.

[0154] <Particle size distribution of the active material> After dispersing the active material in water, the particle size distribution of the active material was measured at a temperature of 25 °C using a laser diffraction particle size distribution analyzer Mastersizer 3000 (manufactured by Malvern).

[0155] <Viscosity of the liquid composition for manufacturing the electrochemical element> The viscosity of the liquid composition for manufacturing the electrochemical element was measured at a rotation speed of 100 rpm and a temperature of 25 °C with a rotor of No. CPA-40Z attached to a B-type viscometer (cone and plate viscometer).

[0156] <Particle size distribution of the liquid composition for manufacturing the electrochemical element> The particle size distribution of the liquid composition for manufacturing the electrochemical element was measured at a temperature of 25 °C using a laser diffraction particle size distribution analyzer Mastersizer 3000 (manufactured by Malvern).

[0157] <Manufacture of the positive electrode active material> [Manufacture of positive electrode active material 1] Vanadium pentoxide, lithium hydroxide, phosphoric acid, sucrose, and water were mixed to form a precipitate, which was then spray-dried with a spray dryer and pulverized with a jet mill to obtain a precursor of lithium vanadium phosphate (Li3V2(PO4)3) particles. Next, in a nitrogen atmosphere, the precursor of lithium vanadium phosphate particles was calcined at 900 °C to obtain lithium vanadium phosphate particles with a carbon content of 3% by mass. Next, D 90 The lithium vanadium phosphate particles were disintegrated with a jet mill so that D became less than 3 μm to obtain positive electrode active material 1. The positive electrode active material 1 had a mode diameter of 0.7 μm.

[0158] [Manufacture of positive electrode active material 2] D 90The lithium iron phosphate (LiFePO4) particles (manufactured by Sigma-Aldrich) were crushed with a jet mill so that the diameter became less than 3 μm, and the positive electrode active material 2 was obtained. The mode diameter of the positive electrode active material 2 was 0.6 μm.

[0159] [Manufacture of Positive Electrode Active Material 3] D 90 The lithium cobalt oxide (LiCoO2) particles (manufactured by Sigma-Aldrich) were crushed with a jet mill so that the diameter became less than 3 μm, and the positive electrode active material 3 was obtained. The mode diameter of the positive electrode active material 3 was 0.9 μm.

[0160] [Manufacture of Positive Electrode Active Material 4] D 90 The lithium nickel 0.8 Co 0.15 Al 0.05 oxide (LiNiCoAlO2) particles (manufactured by Sigma-Aldrich) were crushed with a jet mill so that the diameter became less than 3 μm, and the positive electrode active material 4 was obtained. The mode diameter of the positive electrode active material 4 was 1.2 μm.

[0161] [Manufacture of Positive Electrode Active Material 5] D 90 The Ni-Mn-Co system (LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 oxide (LiNiMnCoO2) particles (manufactured by Sigma-Aldrich) were crushed with a jet mill so that the diameter became less than 3 μm, and the positive electrode active material 5 was obtained. The mode diameter of the positive electrode active material 5 was 0.9 μm.

[0162] [Manufacture of Positive Electrode Active Material 6] D 90 The lithium manganese oxide (LiMn2O4) particles (manufactured by Sigma-Aldrich) were crushed with a jet mill so that the diameter became less than 3 μm, and the positive electrode active material 6 was obtained. The mode diameter of the positive electrode active material 6 was 1.2 μm.

[0163] [Manufacture of Negative Electrode Active Material] [Manufacture of Negative Electrode Active Material 1] D 90Artificial graphite (manufactured by MTI Carbon) was pulverized with a jet mill so that it would be less than 3 μm, and the negative electrode active material 1 was obtained. The negative electrode active material 1 had a mode diameter of 1.8 μm.

[0164] [Production of Negative Electrode Active Material 2] D 90 Lithium titanate (Li4Ti5O 12 ) particles (manufactured by Sigma-Aldrich) were pulverized with a jet mill so that it would be less than 3 μm, and the negative electrode active material 2 was obtained. The negative electrode active material 2 had a mode diameter of 0.7 μm.

[0165] [Production of Polymer] [Synthesis of Polymer 1] Polymer 1 was synthesized according to the following scheme.

[0166] [Chemical Formula]

[0167] (Synthesis of Compound 1) 4.63 g (28.2 mmol) of triethylene glycol monomethyl ether and 80 ml of tetrahydrofuran were placed in a flask, and then the inside of the system was purged with nitrogen. Next, after cooling the reaction solution to 0 °C, 5.00 g (21.7 mmol) of 3,5-dinitrobenzoyl chloride was added. Next, 4.60 ml (32.5 mmol) of triethylamine was slowly added dropwise, and then the reaction solution was returned to room temperature and stirred overnight. Next, the reaction solution was filtered through celite, and then the solvent was distilled off under reduced pressure from the filtrate. Next, the residue was purified by column chromatography to obtain Compound 1.

[0168] (Synthesis of Compound 2) The obtained Compound 1, 0.7 g of 10% palladium carbon, and 80 ml of ethyl acetate were placed in a flask, and then stirred in a hydrogen atmosphere until hydrogen consumption ceased. Next, the reaction solution was filtered through celite, and then the filtrate was purified by column chromatography to obtain Compound 2 (5.69 g; yield 88%).

[0169] (Synthesis of Polymer 1) 1.50 g (5.03 mmol) of Compound 2, 30 mL of DMF, and 0.7 mL of triethylamine were placed in a flask, and then the system was purged with nitrogen. Next, 1.06 g (5.03 mmol) of trimellitic anhydride chloride was added to the reaction solution, followed by stirring for 10 hours. Next, water was added to the reaction solution, and the precipitated solid was collected by filtration. The obtained solid was dried under vacuum to obtain Polymer 1 (1.92 g; yield 81%).

[0170] [Synthesis of Polymer 2] Polymer 2 was synthesized according to the following scheme. That is, 0.40 g of Polymer 1 was weighed into a glass petri dish, and then left at 180 °C for 2 hours under air to obtain Polymer 2 (0.37 g). The polystyrene-equivalent molecular weights determined by GPC were Mw: 4904 and Mn: 2820. Polymer 2 was soluble in solvents such as NMP, DMF, DMA, and DMSO.

[0171] [Chemical formula]

[0172] [Synthesis of Polymer 3] Polymer 3 was synthesized according to the following scheme. That is, 0.50 g of Polymer 1, 5 mL of DMF, and 5 mL of methanol were added to a flask. Next, a 0.6 M hexane solution of trimethylsilyldiazomethane was added to the reaction solution, followed by stirring at room temperature for 2 hours. Next, the solvent was distilled off under reduced pressure from the reaction solution. Next, the residue was washed with ethyl acetate and then dried under vacuum to obtain Polymer 3.

[0173] [Chemical formula]

[0174] [Synthesis of Polymer 4] Polymer 4 was synthesized according to the following scheme. That is, Polymer 4 was synthesized in the same manner as Polymer 1 except that tripropylene glycol monomethyl ether was used instead of triethylene glycol monomethyl ether.

[0175] [Chemical formula]

[0176] [Synthesis of Polymer 5] Polymer 5 was synthesized according to the following scheme. That is, Polymer 5 was synthesized in the same manner as Polymer 2, except that Polymer 4 was used instead of Polymer 1. The polystyrene equivalent molecular weight by GPC was Mw: 8960 and Mn: 4360. Polymer 5 was soluble in solvents such as NMP, DMF, DMA, DMSO, THF, ethyl lactate, acetone, and cyclohexanone.

[0177] [Chemical formula]

[0178] [Synthesis of Polymer 6] Polymer 6 was synthesized according to the following scheme. That is, 0.33 g (1.10 mmol) of Compound 2, 1.13 g (3.30 mmol) of Compound 4, and 30 ml of DMF were placed in a flask, and then the system was purged with nitrogen. Next, 0.93 g (4.40 mmol) of trimellitic anhydride chloride was added to the reaction solution. Next, 0.61 ml of triethylamine was added dropwise, and then the mixture was stirred at room temperature for 10 hours. Next, water was added to the reaction solution, and the precipitated solid was collected by filtration. Next, the obtained solid was dried under vacuum to obtain Polymer 6 (2.10 g; yield ~100%).

[0179] [Chemical formula]

[0180] [Synthesis of Polymer 7] Polymer 7 was synthesized according to the following scheme. That is, polymer 7 was synthesized in the same manner as polymer 2, except that polymer 6 was used instead of polymer 1. The polystyrene-equivalent molecular weights determined by GPC were Mw: 5780 and Mn: 2860. Polymer 7 was soluble in solvents such as NMP, DMF, DMA, DMSO, THF, ethyl lactate, acetone, and cyclohexanone.

[0181]

Chemical formula

[0182] [Synthesis of Polymer 8] Polymer 8 was synthesized according to the following scheme. That is, polymer 8 was synthesized in the same manner as polymer 1, except that 3,7-dimethyloctanol was used instead of triethylene glycol monomethyl ether.

[0183]

Chemical formula

[0184] [Synthesis of Polymer 9] Polymer 9 was synthesized according to the following scheme. That is, polymer 9 was synthesized in the same manner as polymer 2, except that polymer 8 was used instead of polymer 1. The polystyrene-equivalent molecular weights determined by GPC were Mw: 3687 and Mn: 1820. Polymer 9 was soluble in solvents such as NMP, DMF, DMA, DMSO, THF, 1,2-diethoxyethane, chloroform, and anisole.

[0185]

Chemical formula

[0186] [Synthesis of Polymer 10] Polymer 10 was synthesized according to the following scheme. That is, polymer 10 was synthesized in the same manner as polymer 1, except that 2-ethylhexanol was used instead of triethylene glycol monomethyl ether.

[0187] [Chemical formula]

[0188] [Synthesis of Polymer 11] Polymer 11 was synthesized according to the following scheme. That is, Polymer 11 was synthesized in the same manner as Polymer 2, except that Polymer 10 was used instead of Polymer 1. The polystyrene-equivalent molecular weights by GPC were Mw: 3820 and Mn: 2100. Polymer 11 was soluble in solvents such as NMP, DMF, DMA, DMSO, 1,2-diethoxyethane, THF, chloroform, and anisole.

[0189] [Chemical formula]

[0190] [Synthesis of Polymer 12] Polymer 12 was synthesized according to the following scheme. That is, Polymer 12 was synthesized in the same manner as Polymer 6, except that Compounds 6 and 7 were used instead of Compounds 2 and 4.

[0191] [Chemical formula]

[0192] [Synthesis of Polymer 13] Polymer 13 was synthesized according to the following scheme. Polymer 13 was synthesized in the same manner as the synthesis of Polymer 2, except that Polymer 12 was heat-treated at 260 °C. Polymer 13 was soluble in solvents such as NMP, DMF, DMA, and DMSO.

[0193] [Chemical formula]

[0194] [Synthesis of Polymer 14] Polymer 14 was synthesized according to the following scheme. That is, Polymer 14 was synthesized in the same manner as Polymer 6, except that Compounds 6 and 8 were used instead of Compounds 2 and 4.

[0195]

Chemical formula

[0196] [Synthesis of Polymer 15] Polymer 15 was synthesized according to the following scheme. That is, Polymer 15 was synthesized in the same manner as Polymer 2, except that Polymer 14 was used instead of Polymer 1. Polymer 13 was soluble in solvents such as NMP, DMF, DMA, and DMSO.

[0197]

Chemical formula

[0198] [Example 1] Ethyl lactate was added to a solid content composed of Positive Electrode Active Material 1 (93.1% by mass), a polyethylene glycol-based dispersant (0.9% by mass), carbon black (3% by mass), and Polymer 5 (3% by mass) so that the concentration of the solid content became 35.8% by mass, and a liquid composition for forming a positive electrode was prepared. The liquid composition for forming a positive electrode had a viscosity of 15 mPa·s, a mode diameter of 0.7 μm, and D 90 of 3.1 μm.

[0199] Twenty-four hours after the liquid composition for forming a positive electrode was prepared, the particle size distribution of the liquid composition for forming a positive electrode was re-measured, and no change was observed in the particle size distribution, indicating that the liquid composition for forming a positive electrode had good storage stability.

[0200] Using a liquid ejection device EV2500 (manufactured by Ricoh), a liquid composition for positive electrode formation was ejected onto an aluminum foil as a positive electrode substrate to form a positive electrode. At this time, the liquid composition for positive electrode formation could be continuously ejected, and the liquid composition for positive electrode formation had good ejection stability and no ejection failure occurred. That is, the liquid composition for positive electrode formation had good printing efficiency.

[0201] <Example 2> A liquid composition for positive electrode formation was prepared in the same manner as in Example 1, except that polymer 7 was used instead of polymer 5. The liquid composition for positive electrode formation had a viscosity of 13 mPa·s, a mode diameter of 0.7 μm, and D 90 was 2.9 μm.

[0202] Twenty-four hours after preparing the liquid composition for positive electrode formation, when the particle size distribution of the liquid composition for positive electrode formation was re-measured, no change was observed in the particle size distribution, and the liquid composition for positive electrode formation had good storage stability.

[0203] Using a liquid ejection device EV2500 (manufactured by Ricoh), a liquid composition for positive electrode formation was ejected onto an aluminum foil as a positive electrode substrate. At this time, the liquid composition for positive electrode formation could be continuously ejected, and the liquid composition for positive electrode formation had good ejection stability and no ejection failure occurred. That is, the liquid composition for positive electrode formation had good printing efficiency.

[0204] <Comparative Example 1> In the same manner as in Example 1, an attempt was made to prepare a liquid composition for positive electrode formation using polyvinylidene fluoride (PVDF) widely used as a battery binder, but PVDF did not dissolve and could not be prepared.

[0205] <Example 3> [Evaluation of Binding Property] N-methylpyrrolidone was added to a solid content composed of a positive electrode active material 1 (93% by mass) and a polymer 2 (3% by mass) so that the concentration of the solid content became 50% by mass, and a liquid composition for manufacturing an electrochemical element was prepared. This dispersion was coated on an aluminum foil with a gap of 100 μm using a doctor blade, and then dried at 120 °C for 10 minutes. The peeling strength of the electrode composite layer of the obtained film was measured using an adhesion and film peeling analysis apparatus VPA-3 (manufactured by Kyowa Interface Science Co., Ltd.) (peel strength test method). Specifically, after attaching a cellophane tape to the surface on the electrode composite layer side of a test piece cut to a width of 1.8 cm × a length of 10 cm, the cellophane tape was peeled off by 50 mm from one end of the test piece under the conditions of a peeling speed of 30 mm / min and a peeling angle of 90°, and the stress at that time was measured. The results are shown in FIG. 8.

[0206] <Examples 4 and 5> In the same manner as in Example 3, the adhesiveness was evaluated using Polymer 5 and Polymer 7. The results are shown in FIG. 8.

[0207] <Comparative Example 2> In the same manner as in Example 3, the adhesiveness was evaluated using polyvinylidene fluoride (PVDF) which is widely used as a binder for a battery. The results are shown in FIG. 8.

[0208] From the results in FIG. 8, it can be seen that the peeling strength of the polymers used in Examples 3, 4, and 5 is superior to that of PVDF. That is, when an electrochemical element is created using the liquid composition for manufacturing an electrochemical element of the present embodiment, an electrochemical element having excellent peeling strength and high safety can be provided.

Description of Reference Numerals

[0209] 1 Secondary battery 10, 15 Negative electrode 11 Negative electrode substrate 12 Negative electrode composite layer 12A Liquid composition 20, 25 Positive electrode 21 Positive electrode substrate 22 Positive electrode composite layer 30 Separator 40 Electrode element Leads 41 and 42 Electrolyte layer 51 Outer package 52 Liquid ejection devices 300 and 300' Liquid ejection head 306

Prior art documents

Patent documents

[0210]

Patent Document 1

Claims

1. A non-aqueous liquid composition for manufacturing an electrochemical device, comprising at least one of an active material and an electrolyte, a dispersion medium, and a polymer, wherein the polymer is a polyamide-imide resin having a group represented by the general formula (I) 【Chemical 1】 (wherein X is an oxygen atom, and R １ , R ２ , R ３ and R ４ are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 18 carbon atoms, m is 1, and n is 3.) as a side chain, and the polyamide-imide resin is bonded to the group represented by the general formula (I) through an ester bond via an oxygen atom of the group represented by the general formula (I).

2. The non-aqueous liquid composition for manufacturing an electrochemical device according to Claim 1, containing the active material.

3. The non-aqueous liquid composition for manufacturing an electrochemical device according to Claim 1 or 2, wherein the polymer is dissolved in the dispersion medium.

4. The non-aqueous liquid composition for manufacturing an electrochemical device according to any one of Claims 1 to 3, wherein the content of the active material is 10% by mass or more.

5. The non-aqueous liquid composition for manufacturing an electrochemical device according to any one of Claims 1 to 4, wherein the active material is at least one selected from the group consisting of a lithium-containing transition metal compound, a lithium-containing transition metal phosphate compound, and a carbon material.

6. Further comprising a conductive auxiliary agent, wherein the active material contains the lithium-containing transition metal phosphate compound, the lithium-containing transition metal phosphate compound is complexed with the conductive auxiliary agent, and the conductive auxiliary agent is a carbon material.

7. The non-aqueous liquid composition for manufacturing an electrochemical device according to any one of Claims 1 to 6, having a viscosity at 25 ° C of 200 mPa·s or less.

8. The non-aqueous liquid composition for manufacturing an electrochemical device according to any one of Claims 1 to 7, wherein the active material contains lithium, and the dispersion medium is a non-aqueous dispersion medium.

9. A method for manufacturing an electrode, comprising a step of applying the non-aqueous liquid composition for manufacturing an electrochemical device according to any one of Claims 1 to 8 onto an electrode substrate.

10. The method for manufacturing an electrode according to Claim 9, wherein the non-aqueous liquid composition for manufacturing an electrochemical device is discharged onto an electrode substrate.

11. The method for manufacturing an electrode according to Claim 10, further comprising a step of pressurizing the electrode substrate onto which the non-aqueous liquid composition for manufacturing an electrochemical device has been discharged.

12. A method for manufacturing an electrochemical device, comprising a step of manufacturing an electrode using the method for manufacturing an electrode according to any one of Claims 9 to 11.

13. An electrode manufactured by the method for manufacturing an electrode according to any one of Claims 9 to 11.

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