JP2011198483A - Electrode plate for nonaqueous secondary battery, manufacturing method thereof, and nonaqueous secondary battery using electrode plate thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonaqueous secondary battery with high reliability in which cut of an electrode plate and fall-off of an electrode mixture layer are prevented while maintaining the amount of an electrode active material necessary for high capacity, by controlling the coating shape and coating position of the electrode mixture layer coated and formed on a current collector.SOLUTION: In the nonaqueous secondary battery, a positive electrode plate 5 in which a positive electrode mixture layer 2 with only the end of winding start side in winding direction thinly made is coated and formed on a positive electrode current collector 1, a negative electrode plate 10 in which a thin negative electrode mixture layer 7 with only the end of winding start side in winding direction on a negative electrode current collector 6 is coated and formed, and a porous insulator 11 are wound around in an arrow direction of the drawing, thereby, the curvatures of the positive electrode plate 5 and the negative electrode plate 10 wound in the outer circumference are made small and an electrode group 12 close to a perfect circle is constructed.

Description

  The present invention relates to a non-aqueous secondary battery represented by a lithium ion secondary battery, and more particularly to an electrode plate for a non-aqueous secondary battery, a manufacturing method thereof, and a non-aqueous secondary battery using the same.

In recent years, a lithium ion secondary battery as a non-aqueous secondary battery that is widely used as a power source for portable electronic devices uses a carbonaceous material capable of occluding and releasing lithium in the negative electrode plate, and LiCoO in the positive electrode plate. A composite oxide of a transition metal such as ₂ and lithium is used as an active material, thereby realizing a lithium ion secondary battery having a high potential and a high discharge capacity. However, with the recent increase in functionality of electronic devices and communication devices, it is desired that the lithium ion secondary battery be safer in terms of higher capacity and higher capacity.

  A lithium ion secondary battery in which an electrode group in which a strip-like positive electrode plate and negative electrode plate are wound in a cylindrical shape with a porous insulator interposed therebetween is enclosed in a battery case together with a non-aqueous electrolyte solution has a certain tension. By winding in addition to the electrode plate, the distance between the electrode plates is minimized and can be accommodated in the cylindrical battery case without any gaps. Therefore, when using a laminate container for the battery case or using a non-cylindrical case such as a square type Compared to, it is easy to construct a battery with a high capacity.

  However, in order to safely configure the electrode group of the cylindrical lithium ion secondary battery without breaking the electrode plate and without peeling off the mixture layer, the electrode plate is not loose so as to bend with a small radius of curvature. It is necessary to wind the electrode plate with a curve, that is, with a large radius of curvature. For example, when a positive electrode plate with a mixture layer formed on both sides of a current collector made of aluminum foil is wound with a small radius of curvature, a compressive stress is applied to the inner mixture layer on the inside, and reaction force collects it. A tensile stress acts in the circumferential direction on the electric material and the mixture layer on the outer peripheral side. As a result, the mixture layer on the inner peripheral side peels off, and a crack is formed in the mixture layer on the outer peripheral side to form a groove. The current collector stretches due to tensile stress and breaks when it reaches its yield point. Therefore, the smaller the radius of curvature, the more the inner mixture layer is peeled off, and the current collector is more likely to break and the safety is lowered.

  Therefore, many efforts have been made to keep the radius of curvature large and to make the thickness of the electrode plate uniform. For example, in FIG. 8, when the intermittent paint supply valve 522 is closed, the control unit 530 measures the hydraulic pressure by the pressure sensor 515, and the piston 545 is moved backward by the air cylinder 546 of the extraction device 538 to advance the first check valve 540, While controlling the internal pressure of the die 514 by opening and closing the second check valve 544, the control unit 530 closes the intermittent paint supply valve 522 50 to 200 milliseconds after the first step, and stops the supply of the coating liquid, It is a block diagram of the coating apparatus formed in the web W which is drive | working the uncoated area.

  Specifically, the web W is conveyed by the backup roller 512 in FIG. A die 514 for discharging the coating liquid is provided on the left side of the backup roller 512. A liquid reservoir 516 is provided in the die 514 to store the coating liquid, and the coating liquid is sent from the liquid reservoir 516 to the discharge port 518 at the tip of the die 514.

The coating liquid is pumped from the pump 520 to the die 514. A paint supply valve 522 is provided between the pressure pump 520 and the die 514 to stop the pumping of the coating liquid. A branch pipe 524 is provided between the paint supply valve 522 and the die 514. A relief valve 532 is provided between the pressure feed pump 520 and the paint supply valve 522. A hydraulic pressure gauge 534 is provided on the pressure feed pump 520 side of the relief valve 532, and the coating liquid from the relief valve 532 is discharged to the discharge tank 536.

  On the outlet side of the branch pipe 524, an extraction device 538 for extracting a certain amount of coating liquid is provided. The extraction device 538 is provided in the first check valve 540 provided on the outlet side of the branch pipe 524, the cylinder chamber 542 provided on the outlet side of the first check valve 540, and the cylinder chamber 542. And a second check valve 544, and a piston 545 is provided inside the cylinder chamber 542. The piston 545 is driven by an air cylinder 546. Further, a discharge tank 548 for storing the coating liquid is provided on the outlet side of the second check valve 544. A pressure sensor 515 for measuring the internal pressure of the liquid reservoir 516 is provided inside the liquid reservoir 516 of the die 514.

  In order to alternately form a coating section and an uncoated section by this coating apparatus, a control unit 530 including a microcomputer is provided. The control unit 530 receives a conveyance speed V for conveying the web W, and opens and closes the paint supply valve 522 in accordance with the conveyance speed V. A signal indicating the pressure of the liquid reservoir 516 is input from the pressure sensor 515 to the controller 530, and the drive of the air cylinder 546 is controlled (see, for example, Patent Document 1).

  As another method, an intermittent supply valve 603 connected to a slit die 604 on a web 601 as shown in FIGS. 9A and 9B and also connected to a paint pressure feed pump connected to a pipe 606, In a coating apparatus that performs intermittent application by opening and closing the gate valve 609, when the supply of liquid is stopped by the intermittent supply valve 603, the valve body 615 is moved to generate a negative pressure in the slit die 604 on the downstream side, When starting the supply, the valve body 615 is separated from the valve seat 612 by the liquid, and the generation of the positive pressure does not particularly change immediately after the supply starts, or the supply amount does not increase temporarily at the start of the liquid supply. The thickness of the mixture layer at the boundary of the uncoated portion on the web 601 is made uniform by a configuration so as to be a proper amount (see, for example, Patent Document 2).

  As another method, as shown in FIG. 10, the operation speed of the application liquid suction / discharge means 717 connected to the coating head 712 for applying the paint onto the web 710 conveyed by the back roller 711 can be arbitrarily controlled. An intermittent coating apparatus has been developed that controls the servo motor 721 that is driven by a program set in advance according to the formation of the coating part and the non-coating part to make the thickness of the mixture layer uniform. (For example, refer to Patent Document 3).

JP 2002-219400 A JP 2001-38276 A JP 2009-95752 A

  However, in the prior art disclosed in Patent Document 1 described above, as shown in FIG. 8, the shape of the application start end and application end of the active material on the electrode plate is uniquely determined by the type of air cylinder and the air pressure, and the application start end. There is a problem that it is difficult to freely determine the shape of the terminal. Further, in the conventional technique shown in Patent Document 2 described above, it is possible to suppress the swell of the coating start end as shown in FIG. 9, but it is difficult to freely determine the shape of the coating start end and termination. There was a problem. Further, in the prior art disclosed in Patent Document 3 described above, a gentle application starting end can be formed as shown in FIG. 10, but since the rotary motion is converted into a linear motion, the valve can be opened and closed at high speed. There is a problem that it is difficult to obtain a high-capacity non-aqueous secondary battery because the coating terminal portion has a relatively gentle shape.

  The present invention has been made in view of the above prior art, and controls the amount of coating at the start and end of coating, and the positive electrode mixture layer or the negative electrode mixture layer formed on the positive electrode current collector or the negative electrode current collector is formed. An electrode plate for a non-aqueous secondary battery characterized in that only the winding start side end in the winding direction has an inclination that becomes thinner toward the end, a method for manufacturing the same, and a non-aqueous two using the same The purpose is to provide a secondary battery.

  In order to achieve the above object, an electrode plate for a non-aqueous secondary battery according to the present invention is a positive electrode mixture paint in which an active material, a conductive material and a binder comprising at least a lithium-containing composite oxide are kneaded and dispersed in a dispersion medium. A positive electrode plate in which a positive electrode current collector layer is formed by coating a positive electrode current collector or a negative electrode mixture coating material in which an active material and a binder made of a material capable of holding at least lithium are kneaded and dispersed in a dispersion medium An electrode plate for a non-aqueous secondary battery comprising a negative electrode plate coated on a negative electrode current collector to form a negative electrode mixture layer, the positive electrode composite formed by coating on the positive electrode current collector or the negative electrode current collector It is characterized in that it is formed by coating so that only the winding start side end portion in the winding direction of the agent layer or the negative electrode mixture layer becomes thinner as it becomes the end portion.

  As described above, the electrode plate for a non-aqueous secondary battery of the present invention uses an electrode plate having a gradual thickness change only on the winding start side constituting the electrode group, so that the electrode plate can be used even on the winding start side with a small radius of curvature. A safe and high-capacity non-aqueous secondary battery that does not cause an internal short circuit due to breakage, peeling, or breakage of the porous insulator can be provided.

(A) Schematic sectional view showing the arrangement state of the positive electrode plate, the negative electrode plate, and the porous insulator in one embodiment of the present invention, (b) The main part showing the winding state of the electrode group in one embodiment of the present invention Sectional view (A) Schematic sectional view showing an arrangement state of a positive electrode plate, a negative electrode plate and a porous insulator in another embodiment of the present invention, (b) a winding state of an electrode group in another embodiment of the present invention. Cross section (A) Schematic sectional view showing an arrangement state of a positive electrode plate, a negative electrode plate and a porous insulator in another embodiment of the present invention, (b) a winding state of an electrode group in another embodiment of the present invention. Cross section 1 is a partially cutaway perspective view of a cylindrical secondary battery according to an embodiment of the present invention. (A) Schematic sectional view showing an arrangement state of a positive electrode plate, a negative electrode plate and a porous insulator in a comparative example of the present invention, (b) a principal part sectional view showing a winding state of an electrode group in the comparative example The figure which shows the manufacturing method which apply | coats and forms the mixture layer of the electrode plate concerning one embodiment of this invention The figure which shows the manufacturing method which apply | coats and forms the mixture layer of the electrode plate concerning another embodiment of this invention. The figure which shows the manufacturing method which apply | coats and forms the mixture layer of the electrode plate in a prior art example (A) The figure which shows the manufacturing method which apply | coats and forms the mixture layer of the electrode plate in another prior art example, (b) The schematic sectional drawing which shows an intermittent supply valve Furthermore, the figure which shows the manufacturing method which apply | coats and forms the mixture layer of the electrode plate in another prior art example

In the first invention of the present invention, a positive electrode mixture paint obtained by kneading and dispersing at least an active material composed of a lithium-containing composite oxide, a conductive material, and a binder with a dispersion medium is applied onto a positive electrode current collector. Non-aqueous secondary battery comprising a positive electrode plate or a negative electrode plate coated with a negative electrode mixture paint prepared by kneading and dispersing an active material and a binder made of a material capable of holding lithium at least in a dispersion medium An electrode plate for a positive electrode current collector layer or a negative electrode current collector layer formed on a positive electrode current collector or a negative electrode current collector. By using an electrode plate with a gradual change in thickness constituting the electrode group on the winding start side, the electrode plate is cut, peeled off, and eventually porous even on the winding start side with a small radius of curvature. Safe and safe from breaking through insulators and causing internal short circuits It can provide a nonaqueous secondary battery capacity.

  2nd invention of this invention WHEREIN: It is a manufacturing method of the electrode plate for non-aqueous secondary batteries which apply | coats an electrode mixture coating material intermittently using the die-coater on the collector which runs continuously, Comprising: Start of coating Sometimes the coating supply valve opening speed is lower than the coating supply valve closing speed when the coating is stopped, so that it becomes the end of the coating start end in the positive electrode mixture layer and / or the negative electrode mixture layer after coating and drying. By coating and forming a thin slope, the electrode plate is cut and peeled off even on the winding start side with a small radius of curvature, and thus a safe and high-capacity non-aqueous secondary that does not break through the porous insulator and cause an internal short circuit A battery electrode plate can be provided.

  In the third aspect of the present invention, by using a direct-acting or rotating air cylinder capable of adjusting the inflow and outflow of air to open and close the paint supply valve, the positive electrode mixture layer after application and drying and / or It becomes possible to apply and form an inclination that becomes thinner as the end of the coating in the negative electrode mixture layer becomes thinner, and can be easily implemented without requiring a complicated control device for the application and formation.

  In the fourth invention of the present invention, by using a motor with variable forward and reverse speeds to open and close the paint supply valve, the coating start and end portions of the positive electrode mixture layer and / or the negative electrode mixture layer after coating and drying are used. It becomes possible to apply and form a slant that becomes thinner toward the end, and it is possible to operate at high speed, to open and close the paint supply valve earlier, and to widen the angle range where the mixture layer end can be formed. .

  In the fifth invention of the present invention, the positive electrode mixture layer and / or the negative electrode after coating and drying are used for opening and closing the coating material supply valve by using a linear motion obtained by converting a forward and reverse speed variable motor with a ball screw. It is possible to apply and form a slope that becomes thinner as it reaches the end of the coating start end in the mixture layer.

  In the sixth invention of the present invention, a positive electrode mixture layer after coating and drying is formed by using a linear drive device configured by a magnet and a coil for opening and closing the paint supply valve and performing a direct drive motion whose speed is variable by electromagnetic force. It is possible to apply and form a slope that becomes thinner toward the end of the coating start end in the negative electrode mixture layer, and it is possible to operate at high speed and open and close the paint supply valve more quickly. The angle range in which the layer end slope can be formed is widened.

  In the seventh aspect of the present invention, a positive electrode plate in which a positive electrode mixture layer containing at least a composite lithium oxide as an active material is intermittently applied and formed in the width direction by providing an uncoated portion in the longitudinal direction of the positive electrode current collector Or a negative electrode plate provided with an uncoated portion in the longitudinal direction of the negative electrode current collector and provided with a negative electrode mixture layer containing at least a material capable of holding lithium as an active material. At least one of the positive electrode plate and the negative electrode plate A positive electrode plate having a slope that becomes thinner as only the end portion on the winding start side in the winding direction of the positive electrode mixture layer or the negative electrode mixture layer formed on one of the positive electrode current collector or the negative electrode current collector becomes an end portion In addition, a nonaqueous secondary battery with high capacity and high safety can be provided by enclosing an electrode group configured using a negative electrode plate and a porous insulator in a battery case together with a nonaqueous electrolytic solution.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The non-aqueous secondary battery of the present invention can be configured as shown in FIG. 4, for example. A positive electrode plate 5 using a composite lithium oxide as a positive electrode active material and a negative electrode plate 10 using a material capable of holding lithium as a negative electrode active material are spirally wound through a porous insulator 11 to form an electrode group 12. Has been. The electrode group 12 is accommodated in the bottomed cylindrical battery case 13 together with the insulating plate 16, the negative electrode lead 8 led out from the lower part of the electrode group 12 is connected to the bottom part of the battery case 13, and then the upper part of the electrode group 12 After connecting the positive lead 3 led out to the sealing plate 14 and injecting a non-aqueous electrolyte solution (not shown) made of a non-aqueous solvent into the battery case 13, a sealing gasket is formed in the opening of the battery case 13. A sealing plate 14 with 15 attached to the periphery can be inserted, and the opening of the battery case 13 can be folded inward to be caulked and sealed.

  Here, as the electrode plate for a non-aqueous secondary battery of the present invention, for example, as shown in FIG. 1A, by controlling the coating amount when applying the positive electrode mixture paint to the positive electrode current collector 1, Only the starting end in the winding direction of the positive electrode mixture layer 2 applied and formed on the positive electrode current collector 1 is applied and formed so as to become thinner toward the end. Specifically, as shown in FIG. 1 (a), a positive electrode mixture paint is applied to the positive electrode current collector 1 by controlling the amount applied, dried, and then pressed to form a cylindrical non-aqueous secondary battery. Then, the positive electrode lead 3 is connected to the portion where the positive electrode current collector 1 is exposed, and the positive electrode protective tape 4 is applied so as to cover the positive electrode lead 3, thereby positive electrode plate 5. Is configured.

  On the other hand, as the negative electrode plate, for example, as shown in FIG. 1A, the negative electrode current collector 6 is coated and formed by controlling the coating amount when the negative electrode mixture paint is applied to the negative electrode current collector 6. Only the starting end portion of the negative electrode mixture layer 7 in the winding direction is coated and formed so as to become thinner toward the end portion. Then, the negative electrode mixture paint is applied to the negative electrode current collector 6, dried and pressed to form the negative electrode mixture layer 7, and then slitted to the specified width of the cylindrical non-aqueous secondary battery, A negative electrode plate 10 is configured by connecting a negative electrode lead 8 to a portion where the negative electrode current collector 6 is exposed and attaching a negative electrode protective tape 9 so as to cover the negative electrode lead 8.

  Thereby, the electrode group comprised using the electrode plate for non-aqueous secondary batteries of this invention is the edge part which becomes the winding start of a winding direction, as the fragmentary sectional view was shown in FIG.1 (b). The positive electrode plate 5 having the thin positive electrode mixture layer 2, the negative electrode plate 10 having the thin negative electrode mixture layer 7 at the beginning of winding in the winding direction, and the porous insulator 11 are shown in the direction of the arrows in the figure. It is possible to reduce the curvatures of the positive electrode plate 5 and the negative electrode plate 10 that are wound by winding, and to form an electrode group 12 close to a perfect circle shown in FIG. An electrode group can be filled, and a non-aqueous secondary battery with high safety and high capacity can be provided.

  Hereinafter, an example of a method for producing a non-aqueous secondary electrode plate in the present invention will be described. First, although it does not specifically limit about the positive electrode plate 5, The metal foil made from aluminum, aluminum alloy, nickel, or a nickel alloy which has a thickness of 5 micrometers-30 micrometers as the positive electrode electrical power collector 1 can be used. The positive electrode mixture paint applied on the positive electrode current collector 1 is a positive electrode mixture paint obtained by mixing and dispersing a positive electrode active material, a conductive material, and a binder in a dispersion medium using a dispersing machine such as a planetary mixer. Produced. The positive electrode active material, conductive material, and binder are placed in an appropriate dispersion medium, mixed and dispersed by a disperser such as a planetary mixer, and adjusted to the optimum viscosity for application to the current collector and then kneaded. Thus, a positive electrode mixture paint can be produced.

  Examples of the positive electrode active material include lithium cobaltate and modified products thereof (such as lithium cobaltate in which aluminum or magnesium is dissolved), lithium nickelate and modified products thereof (such as those obtained by partially replacing nickel with cobalt). And composite oxides such as lithium manganate and modified products thereof. As the conductive material at this time, for example, carbon black such as acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black, and various graphites may be used alone or in combination.

As the binder for the positive electrode at this time, for example, polyvinylidene fluoride (PVdF), a modified polyvinylidene fluoride, polytetrafluoroethylene (PTFE), a rubber particle binder having an acrylate unit, and the like can be used. At this time, an acrylate monomer or an acrylate oligomer into which a reactive functional group is introduced can be mixed in the binder. Furthermore, the positive electrode mixture paint produced as described above using a die coater is inclined on the positive electrode current collector 1 made of an aluminum foil so that only the starting end that becomes the start of winding in the winding direction becomes thinner. The positive electrode plate 5 can be obtained by applying the film so as to hold it and then drying it and then compressing it to a predetermined thickness with a press. On the other hand, the negative electrode plate 10 is not particularly limited, but a copper or copper alloy metal foil having a thickness of 5 μm to 25 μm can be used as the negative electrode current collector 6. As the negative electrode mixture paint applied on the negative electrode current collector 6, a negative electrode active material, a binder, and a conductive material and a thickener as necessary are mixed in a dispersion medium by a disperser such as a planetary mixer. The negative electrode mixture paint is prepared by dispersing.

  First, the negative electrode active material and the binder are placed in an appropriate dispersion medium, mixed and dispersed by a dispersing machine such as a planetary mixer, and adjusted to the optimum viscosity for application to the current collector and then kneaded. A negative electrode mixture paint can be produced. As the negative electrode active material, various natural graphites and artificial graphites, silicon-based composite materials such as silicide, and various alloy composition materials can be used. Various binders such as PVdF and modified products thereof can be used as the negative electrode binder at this time. From the viewpoint of improving lithium ion acceptability, styrene-butadiene copolymer rubber particles (SBR) and modified products thereof are used. In addition, it can be said that it is more preferable to use a cellulosic resin including carboxymethyl cellulose (CMC) or the like in combination or to add a small amount. Furthermore, the negative electrode mixture paint prepared as described above using a die coater is inclined on the negative electrode current collector 6 made of copper foil so that only the starting end at the beginning of winding in the winding direction becomes the end becomes thinner. The negative electrode plate 10 can be obtained by applying the film so as to hold it and then drying it and then compressing it to a predetermined thickness with a press.

For the non-aqueous electrolyte, various lithium compounds such as LiPF ₆ and LiBF ₄ can be used as the electrolyte salt. Further, ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and methyl ethyl carbonate (MEC) can be used alone or in combination as a solvent. It is also preferable to use vinylene carbonate (VC), cyclohexyl benzene (CHB) and modified products thereof in order to form a good film on the positive / negative electrode plate and to ensure stability during overcharge. The porous insulator 11 is not particularly limited as long as it has a composition that can withstand the use range of the lithium ion secondary battery, but a microporous film of an olefin resin such as polyethylene or polypropylene is used singly or in combination. Is common and preferred as an embodiment. The thickness of the porous insulator 11 is not particularly limited, but may be 10 to 25 μm.

  Hereinafter, specific examples of the present invention will be described in more detail with reference to the drawings and tables. The positive electrode mixture layer or the negative electrode mixture layer formed on the positive electrode current collector or the negative electrode current collector is formed so as to have a slope that becomes thinner toward the end only at the beginning of the winding in the winding direction. As a method, as shown in FIG. 6, a paint supply valve 23 that starts and stops the supply of paint to drive the paint supply pump 21 from the paint supply tank 20 and form intermittent application of the electrode plate via the pipe 22. Supply paint to

  In the paint supply valve 23, when the paint passes through the paint supply valve open pipe 25, the paint is supplied to the open application die 28 and the state of the paint is applied to the positive electrode current collector 1 running on the application roller 29. The mixture layer 2 is applied. On the other hand, when the paint passes through the paint supply valve closed conduit 24, the paint stops at the pipe closing end 26 and is not supplied onto the positive electrode current collector 1, and an uncoated part is formed. Using the paint supply valve driving device 27, the paint supply valve open conduit 25 and the paint supply valve close conduit 24 are switched.

In the present invention, the coating film shape is formed so as to have a slope that becomes thinner as only the winding start side end in the winding direction becomes the end. The coating supply valve 23 is opened at a low speed at the start of coating, and at the end of coating. The positive electrode mixture layer 2 or the negative electrode mixture layer 7 is formed so that the coating supply valve 23 is closed at a high speed so that the end of the winding start side formed by coating is thinned, and the inclined side is wound. Used as the starting side. Alternatively, the coating material supply valve 23 is opened at a high speed at the start of coating, and the coating material supply valve 23 is closed at a small speed at the end of coating. 7 is formed, and by forming the inclined side as the winding start side, the coating film shape is formed so that only the starting end that becomes the winding start in the winding direction of the present invention has an inclination that becomes thinner toward the end. Is possible.

  As the paint supply valve driving device 27, speed control of the paint supply valve 23 can be realized by using linear and rotary air cylinders capable of adjusting the inflow and outflow of air to open and close the paint supply valve. As another paint supply valve driving device 27, the speed control of the paint supply valve 23 can be realized by using a linear motion obtained by converting a forward and reverse speed variable motor with a ball screw to open and close the paint supply valve. As another paint supply valve drive device 27, the speed of the paint supply valve 23 is controlled by using a linear drive device that is configured by a magnet and a coil to open and close the paint supply valve and performs a direct drive motion whose speed is variable by electromagnetic force. Can be realized. As another means of the paint supply valve driving device 27, as shown in FIG. 7, the paint supply valve 23 is configured to switch between the paint supply valve closed line 24 and the paint supply valve open line 25 by a rotational motion. By using a configuration in which the paint supply valve driving device 27 is connected to the same shaft as the supply valve 23, the paint supply valve 27 can be opened and closed by using a motor that can change the forward and reverse speeds or a rotary air cylinder. Speed control of the supply valve 23 can be realized.

  Another embodiment of the present invention will be described with reference to FIGS. Another non-aqueous secondary battery of the present invention can be configured as shown in FIG. By controlling the coating amount when the positive electrode mixture paint is applied to the positive electrode current collector 1, only the starting end in the winding direction of the positive electrode mixture layer 2 applied and formed on the positive electrode current collector 1 becomes the end. The coating is formed so as to be thin. Specifically, as shown in FIG. 2A, the positive electrode mixture paint is applied to the positive electrode current collector 1 while controlling the coating amount, dried, and then pressed to form a cylindrical non-aqueous secondary battery. Then, the positive electrode lead 3 is connected to the portion where the positive electrode current collector 1 is exposed, and the positive electrode protective tape 4 is applied so as to cover the positive electrode lead 3, thereby positive electrode plate 5. Is configured.

  On the other hand, as shown in FIG. 2A, the negative electrode plate has a configuration in which the negative electrode current collector 6 is applied and formed without controlling the application amount when applying the negative electrode mixture paint. Then, the negative electrode mixture paint is applied to the negative electrode current collector 6, dried and pressed to form the negative electrode mixture layer 7, and then slitted to the specified width of the cylindrical non-aqueous secondary battery, A negative electrode plate 10 is configured by connecting a negative electrode lead 8 to a portion where the negative electrode current collector 6 is exposed and attaching a negative electrode protective tape 9 so as to cover the negative electrode lead 8.

  Thereby, the electrode group comprised using the electrode plate for non-aqueous secondary batteries of this invention is the edge part which becomes the winding start of a winding direction, as the fragmentary sectional view was shown in FIG.2 (b) A positive electrode plate 5 having a thin positive electrode mixture layer 2, a negative electrode plate 10 having a negative electrode mixture layer 7 having a non-thin starting end portion, and a porous insulator 11 are wound by winding them in the direction of the arrow in the figure. It is possible to reduce the curvatures of the positive electrode plate 5 and the negative electrode plate 10 to form an electrode group 12 that is relatively close to a perfect circle as shown in FIG. A non-aqueous secondary battery that can be filled and has high safety and high capacity can be provided.

Another non-aqueous secondary battery of the present invention can be configured as shown in FIG. The positive electrode current collector 1 is applied with a positive electrode mixture paint. Specifically, as shown in FIG. 3 (b), the positive electrode mixture paint is applied to the positive electrode current collector 1 by controlling the application amount, dried, and then pressed to form a cylindrical non-aqueous secondary battery. Then, the positive electrode lead 3 is connected to the portion where the positive electrode current collector 1 is exposed, and the positive electrode protective tape 4 is applied so as to cover the positive electrode lead 3, thereby positive electrode plate 5. Is configured.

  On the other hand, as the negative electrode plate, for example, as shown in FIG. 3A, the negative electrode current collector 6 is coated and formed by controlling the coating amount when applying the negative electrode mixture paint to the negative electrode current collector 6. Only the starting end portion of the negative electrode mixture layer 7 in the winding direction is coated and formed so as to become thinner toward the end portion. Then, the negative electrode mixture paint is applied to the negative electrode current collector 6, dried and pressed to form the negative electrode mixture layer 7, and then slitted to the specified width of the cylindrical non-aqueous secondary battery, A negative electrode plate 10 is configured by connecting a negative electrode lead 8 to a portion where the negative electrode current collector 6 is exposed and attaching a negative electrode protective tape 9 so as to cover the negative electrode lead 8.

  Thereby, the electrode group comprised using the electrode plate for nonaqueous secondary batteries of this invention is the edge part which becomes the winding start of a winding direction, as the partial sectional view was shown to Fig.3 (a) Curvature of the positive electrode plate 5 and the negative electrode plate 10 wound by winding the negative electrode plate 10 having the thin negative electrode mixture layer 7, the general positive electrode plate 5 and the porous insulator 11 in the direction of the arrow in the figure. 3 can be formed, and the electrode group 12 that is relatively close to a perfect circle as shown in FIG. 3B can be formed. An aqueous secondary battery can be provided.

  Hereinafter, specific examples of the present invention will be described. First, 100 parts by weight of lithium cobaltate as an active material, 2 parts by weight of acetylene black as a conductive material with respect to 100 parts by weight of the active material, and 2 parts by weight of polyvinylidene fluoride as a binder with respect to 100 parts by weight of the active material Was mixed with an appropriate amount of N-methyl-2-pyrrolidone with a double-arm kneader to prepare a positive electrode mixture paint.

  Next, as shown in FIG. 1 (a), only the one end is controlled by controlling the amount of the positive electrode mixture paint applied to the positive electrode current collector 1 made of an aluminum foil having a thickness of 15 μm. The positive electrode plate is coated so as to have an inclination, dried and then pressed, so that the thickness of the positive electrode mixture layer 2 on one side is 70 μm and the coating start edge of only the positive electrode mixture layer 2 becomes thinner. 5 was produced. The opening speed of the paint supply valve was 0.2 m / s and the closing speed was 1.0 m / s. After that, the positive electrode plate 5 was produced by slitting to a specified width of the cylindrical non-aqueous secondary battery. Further, a positive electrode lead 3 was connected to a portion of the positive electrode plate 5 where the positive electrode current collector 1 was exposed, and a positive electrode protective tape 4 was applied so as to cover the positive electrode lead 3 to constitute the positive electrode plate 5.

  On the other hand, 100 parts by weight of artificial graphite as the active material of the negative electrode, and 2.5 parts by weight of styrene-butadiene copolymer rubber particle dispersion (solid content 40% by weight) as the binder with respect to 100 parts by weight of the active material ( 1 part by weight in terms of the solid content of the binder), 1 part by weight of carboxymethyl cellulose as a thickener with respect to 100 parts by weight of the active material, and an appropriate amount of water are stirred in a double-arm kneader, An agent paint was prepared.

  Next, as shown in FIG. 1 (a), only the one end is controlled by controlling the amount of the negative electrode mixture paint applied to the negative electrode current collector 6 made of a copper foil having a thickness of 10 μm. Was applied after incline, dried, and pressed to prepare a negative electrode plate 10 that became thinner as only the coating start end where the thickness of the negative electrode mixture layer 7 on one side became 80 μm became the end. After that, the negative electrode plate 10 was manufactured by slitting to a width defined for the cylindrical non-aqueous secondary battery. Further, a negative electrode lead 8 was connected to a portion of the negative electrode plate 10 where the negative electrode current collector 6 was exposed, and a negative electrode protective tape 9 was applied so as to cover the negative electrode lead 8, thereby constituting the negative electrode plate 10.

As shown in FIG. 1A, the positive electrode plate 5 and the negative electrode plate 10 manufactured as described above are arranged on the winding start side with a mixture layer having an inclination on the coating start end side, and the porous insulator 11 is interposed therebetween. The electrode group 12 shown in FIG. 1B was constructed by winding it in the direction of the arrow with a tension of 10 N using a winding machine, and the outermost periphery of the electrode group 12 was fixed with an adhesive tape. An electrode group for a lithium secondary battery was obtained.

  First, 100 parts by weight of lithium cobaltate as an active material, 2 parts by weight of acetylene black as a conductive material with respect to 100 parts by weight of the active material, and 2 parts by weight of polyvinylidene fluoride as a binder with respect to 100 parts by weight of the active material Was mixed with an appropriate amount of N-methyl-2-pyrrolidone in a double-arm kneader to prepare a positive electrode mixture paint.

  Next, as shown in FIG. 2A, the above-described positive electrode mixture paint is wound in the winding direction by controlling the amount of the positive electrode mixture paint applied to the positive electrode current collector 1 made of an aluminum foil having a thickness of 15 μm. It is applied so that only the starting end portion at the beginning has an inclination, is dried and then pressed, so that the thickness of the positive electrode mixture layer 2 on one side is 70 μm and the application start end portion of the positive electrode mixture layer 2 becomes the end portion. A thin positive electrode plate 5 was produced. The opening speed of the paint supply valve was 0.2 m / s and the closing speed was 1.0 m / s. After that, the positive electrode plate 5 was produced by slitting to a specified width of the cylindrical non-aqueous secondary battery. Further, a positive electrode lead 3 was connected to a portion of the positive electrode plate 5 where the positive electrode current collector 1 was exposed, and a positive electrode protective tape 4 was applied so as to cover the positive electrode lead 3 to constitute the positive electrode plate 5.

  On the other hand, 100 parts by weight of artificial graphite as the active material of the negative electrode, and 2.5 parts by weight of styrene-butadiene copolymer rubber particle dispersion (solid content 40% by weight) as the binder with respect to 100 parts by weight of the active material ( 1 part by weight in terms of the solid content of the binder), 1 part by weight of carboxymethyl cellulose as a thickener with respect to 100 parts by weight of the active material, and an appropriate amount of water are stirred in a double-arm kneader, An agent paint was prepared.

  Next, as shown in FIG. 2 (a), the negative electrode mixture paint described above is applied to the negative electrode current collector 6 made of a copper foil having a thickness of 10 μm, dried, pressed, and then pressed. The negative electrode plate 10 in which the thickness of the negative electrode mixture layer 7 was 80 μm was produced. After that, the negative electrode plate 10 was manufactured by slitting to a width defined for the cylindrical non-aqueous secondary battery. Further, a negative electrode lead 8 was connected to a portion of the negative electrode plate 10 where the negative electrode current collector 6 was exposed, and a negative electrode protective tape 9 was applied so as to cover the negative electrode lead 8, thereby constituting the negative electrode plate 10.

  A positive electrode plate 5 and a negative electrode plate 10 produced as described above are coated on the positive electrode plate 5 as shown in FIG. 2 (a), and a mixture layer having an inclination on the start end side is disposed on the winding start side, and is porous. The electrode group 12 shown in FIG. 2B is configured by winding in the direction of the arrow with a tension of 10 N using a winding machine through the insulator 11, and the outermost periphery of the electrode group 12 is fixed with an adhesive tape. Was used as the electrode group for a lithium secondary battery of Example 2.

  First, 100 parts by weight of lithium cobaltate as an active material, 2 parts by weight of acetylene black as a conductive material with respect to 100 parts by weight of the active material, and 2 parts by weight of polyvinylidene fluoride as a binder with respect to 100 parts by weight of the active material Was mixed with an appropriate amount of N-methyl-2-pyrrolidone in a double-arm kneader to prepare a positive electrode mixture paint.

Next, as shown in FIG. 3 (a), the above-mentioned positive electrode mixture paint is applied to the positive electrode current collector 1 made of an aluminum foil having a thickness of 15 μm, dried, and then pressed and then pressed. The positive electrode plate 5 in which the thickness of the positive electrode mixture layer 2 was 70 μm was produced. The opening speed of the paint supply valve was 0.2 m / s and the closing speed was 1.0 m / s. After that, the positive electrode plate 5 was produced by slitting to a specified width of the cylindrical non-aqueous secondary battery. Further, a positive electrode lead 3 was connected to a portion of the positive electrode plate 5 where the positive electrode current collector 1 was exposed, and a positive electrode protective tape 4 was applied so as to cover the positive electrode lead 3 to constitute the positive electrode plate 5.

  On the other hand, 100 parts by weight of artificial graphite as the active material of the negative electrode, and 2.5 parts by weight of styrene-butadiene copolymer rubber particle dispersion (solid content 40% by weight) as the binder with respect to 100 parts by weight of the active material ( 1 part by weight in terms of the solid content of the binder), 1 part by weight of carboxymethyl cellulose as a thickener with respect to 100 parts by weight of the active material, and an appropriate amount of water are stirred in a double-arm kneader, An agent paint was prepared.

  Next, as shown in FIG. 3A, the above-described negative electrode mixture paint is wound in the winding direction by controlling the amount of the negative electrode mixture paint applied to the negative electrode current collector 6 made of a copper foil having a thickness of 10 μm. The negative electrode plate is coated so that only the starting end portion at the beginning has an inclination, is dried and then pressed, and the thickness of the negative electrode mixture layer 7 on one side becomes 80 μm, and the coating starting end portion becomes thinner toward the end portion. 10 was produced. After that, the negative electrode plate 10 was manufactured by slitting to a width defined for the cylindrical non-aqueous secondary battery. Further, a negative electrode lead 8 was connected to a portion of the negative electrode plate 10 where the negative electrode current collector 6 was exposed, and a negative electrode protective tape 9 was applied so as to cover the negative electrode lead 8, thereby constituting the negative electrode plate 10.

  A negative electrode plate 10 produced as described above is applied as shown in FIG. 3A, and a mixture layer having an inclination on the start end side of the negative electrode plate 10 is disposed on the winding start side, and the porous insulator 11 is formed. Example 3 in which the electrode group 12 shown in FIG. 3B was constructed by winding in the direction of the arrow with a tension of 10 N using a winding machine, and the outermost periphery of the electrode group 12 was fixed with an adhesive drape. Of lithium secondary batteries.

(Comparative Example 1)
Next, a comparative example will be described with reference to the drawings. First, 100 parts by weight of lithium cobaltate as an active material, 2 parts by weight of acetylene black as a conductive material with respect to 100 parts by weight of the active material, and 2 parts by weight of polyvinylidene fluoride as a binder with respect to 100 parts by weight of the active material Was mixed with an appropriate amount of N-methyl-2-pyrrolidone in a double-arm kneader to prepare a positive electrode mixture paint.

  Next, as shown in FIG. 5 (a), the above-mentioned positive electrode mixture paint is applied to the positive electrode current collector 1 made of an aluminum foil having a thickness of 15 μm, dried, and then pressed, thereby pressing the positive electrode mixture layer on one side. A positive electrode plate 5 having a thickness 2 of 70 μm was produced. Here, as shown in FIG. 5 (a), the positive electrode mixture layer 2 formed by coating had a slightly raised start end and a slightly bent end. Then, the positive electrode plate 5 was produced by slitting to the width defined for the cylindrical non-aqueous secondary battery. Further, a positive electrode lead 3 was connected to a portion of the positive electrode plate 5 where the positive electrode current collector 1 was exposed, and a positive electrode protective tape 4 was applied so as to cover the positive electrode lead 3 to constitute the positive electrode plate 5.

  On the other hand, 100 parts by weight of artificial graphite as the active material of the negative electrode, and 2.5 parts by weight of styrene-butadiene copolymer rubber particle dispersion (solid content 40% by weight) as the binder with respect to 100 parts by weight of the active material ( 1 part by weight in terms of the solid content of the binder), 1 part by weight of carboxymethyl cellulose as a thickener with respect to 100 parts by weight of the active material, and an appropriate amount of water are stirred in a double-arm kneader, An agent paint was prepared.

Next, as shown in FIG. 5A, the negative electrode mixture coating described above is applied to the negative electrode current collector 6 made of a copper foil having a thickness of 10 μm, dried, and then pressed, thereby pressing the negative electrode mixture layer on one side. A negative electrode plate 10 having a thickness of 7 of 80 μm was produced. As shown in FIG. 5A, the negative electrode mixture layer 7 formed by coating was slightly raised at the start end and slightly bent at the end. Then, the negative electrode plate 10 was produced by slitting to the width defined for the cylindrical non-aqueous secondary battery. Further, a negative electrode lead 8 was connected to a portion of the negative electrode plate 10 where the negative electrode current collector 6 was exposed, and a negative electrode protective tape 9 was applied so as to cover the negative electrode lead 8, thereby constituting the negative electrode plate 10.

  The positive electrode plate 5 and the negative electrode plate 10 produced as described above are wound in the direction of the arrow with a tension of 10 N using a winding machine through the porous insulator 11 as shown in FIG. The electrode group 12 shown in FIG. 5B and the outermost periphery of the electrode group 12 fixed with an adhesive tape were used as the lithium ion secondary battery electrode group of Comparative Example 1.

  About the electrode group for lithium ion secondary batteries manufactured on said conditions, after winding up the positive electrode plate 5, the negative electrode plate 10, and the porous insulator 11, the electrode group 12 was comprised, the electrode group 12 was disassembled, and the positive electrode plate 5 (Table 1) shows the results of the evaluation on the presence or absence of breakage of the electrode plate of the negative electrode plate 10 and the winding displacement of the electrode group 12.

  As apparent from (Table 1), the positive electrode plate 5 and the negative electrode plate 10 were coated with an electrode mixture layer that was thinned toward the end of the electrode group only on the winding start side, and Example 1 and the positive electrode plate 5 were combined with the electrode group. The electrode mixture layer was formed by applying and forming the electrode mixture layer that became thinner toward the end of the winding start side of Example 2 and the negative electrode plate 10 and the electrode mixture layer that became thinner toward the end of the winding start side of the electrode group. In Example 3 and in comparison with Comparative Example 1 in which an electrode mixture layer having a shape in which the starting ends of the positive electrode plate 5 and the negative electrode plate 10 are formed in a swelled end is applied, the reduction in the occurrence rate of electrode plate breakage is improved. In comparison with Comparative Example 1, a high-quality lithium secondary battery could be obtained.

  On the other hand, in the electrode plate of Comparative Example 1, the curvatures of the positive electrode plate 5 and the negative electrode plate 10 are increased due to the influence of the end portions of the positive electrode mixture layer 2 and the negative electrode mixture layer 7 as compared with Examples 1 to 3. It turned out that it will be in the winding state with a high occurrence rate of cutting. Further, the positive electrode mixture layer 2 and the negative electrode mixture layer 7 of the positive electrode plate 5 and the negative electrode plate 10 where the curvature increases, that is, the portion with a small radius of curvature, peels off at random locations over the inner and outer circumferences, and completely in the winding width direction. It was found that even if it was not cut, the electrode plate was partially cut.

Further, as shown in FIG. 1 (a), the positive electrode plate 5 on which the positive electrode mixture layer 2 is formed so as to become thinner toward the end only on the winding start side of the electrode group and the end only on the winding start side of the electrode group. As shown in FIG. 4, the electrode group 12 of Example 1 constituted by winding a negative electrode plate 10 coated with a negative electrode mixture layer 7 that becomes thinner as a part is wound through a porous insulator 11, as shown in FIG. The cylindrical battery case 13 is housed together with the insulating plate 16 and the negative electrode lead 8 led out from the lower part of the electrode group 12 is connected to the bottom of the battery case 13. Subsequently, the positive electrode lead 3 led out from the upper part of the electrode group 12 is connected to the sealing plate 14, and a non-aqueous electrolyte solution (not shown) made of a predetermined amount of non-aqueous solvent is injected into the battery case 13, and then the battery case 13. A sealing plate 14 having a sealing gasket 15 attached to the periphery thereof is inserted into the opening of
A non-aqueous secondary battery was produced by bending the opening of the battery case 13 inward and caulking to make a non-aqueous secondary battery of Example 4.

  As shown in FIG. 2 (a), the positive electrode plate 5 on which the positive electrode mixture layer 2 is formed so as to become thinner toward the end only on the winding start side of the electrode group, and the negative electrode mixture layer in which the starting end portion is swelled. As shown in FIG. 4, the electrode group 12 of Example 1 formed by winding the negative electrode plate 10 coated with 7 on the porous insulator 11 is insulated inside the bottomed cylindrical battery case 13. The negative electrode lead 8 housed together with the plate 16 and led out from the lower part of the electrode group 12 is connected to the bottom of the battery case 13. Next, the positive electrode lead 3 led out from the upper part of the electrode group 12 is connected to the sealing plate 14, and a non-aqueous electrolyte solution (not shown) made of a predetermined amount of non-aqueous solvent is injected into the battery case 13. A non-aqueous secondary battery was produced by inserting a sealing plate 14 with a sealing gasket 15 attached to the periphery into the opening, bending the opening of the battery case 13 inward, and sealing it by caulking. A battery was obtained.

  Also, as shown in FIG. 3A, the negative electrode composite whose starting end portion becomes thinner toward the positive electrode plate 5 on which the swelled positive electrode mixture layer 2 is applied and the end portion only on the winding start side of the electrode group. As shown in FIG. 4, the electrode group 12 of Example 2 formed by winding the negative electrode plate 10 coated with the agent layer 7 with a porous insulator 11 is wound inside the bottomed cylindrical battery case 13. The negative electrode lead 8 that is housed together with the insulating plate 16 and led out from the lower part of the electrode group 12 is connected to the bottom of the battery case 13. Next, the positive electrode lead 3 led out from the upper part of the electrode group 12 is connected to the sealing plate 14, and a non-aqueous electrolyte solution (not shown) made of a predetermined amount of non-aqueous solvent is injected into the battery case 13. A non-aqueous secondary battery was produced by inserting a sealing plate 14 with a sealing gasket 15 attached to the periphery into the opening, bending the opening of the battery case 13 inward, and sealing it by caulking. A battery was obtained.

(Comparative Example 2)
Further, as shown in FIG. 5 (a), the positive electrode plate 5 coated with the positive electrode mixture layer 2 having a shape in which the starting end portion has a rising end portion and a negative electrode composite having a shape in which the starting end portion has a rising end portion. As shown in FIG. 4, the electrode group 12 of Comparative Example 1 formed by winding the negative electrode plate 10 coated with the agent layer 7 with the porous insulator 11 is wound inside the bottomed cylindrical battery case 13. The negative electrode lead 8 that is housed together with the insulating plate 16 and led out from the lower part of the electrode group 12 is connected to the bottom of the battery case 13. Next, the positive electrode lead 3 led out from the upper part of the electrode group 12 is connected to the sealing plate 14, and a non-aqueous electrolyte solution (not shown) made of a predetermined amount of non-aqueous solvent is injected into the battery case 13. A non-aqueous secondary battery is manufactured by inserting a sealing plate 14 having a sealing gasket 15 attached to the periphery of the opening, bending the opening of the battery case 13 inward, and sealing it by caulking. A battery was obtained.

  In the above non-aqueous secondary battery, when the electrode group 12 was taken out from the battery case 13 and observed after the non-aqueous secondary battery was produced, both the positive electrode plate 5 and the negative electrode plate 10 of Examples 4 to 6 were observed. There were no defects such as electrode plate breakage or electrode mixture layer dropout. Further, the nonaqueous secondary batteries of Examples 4 to 6 were charged and discharged for 500 cycles, but the cycle characteristics were not deteriorated and the nonaqueous secondary battery and the electrode group 12 were disassembled after 500 cycles. There were no defects such as falling off of the layer.

On the other hand, in the nonaqueous secondary battery of Comparative Example 2, deterioration of cycle characteristics was observed in the vicinity of 300 cycles. Therefore, when the nonaqueous secondary battery and the electrode group 12 were disassembled after 300 cycles, the electrode plate was partially broken and the electrode mixture layer was locally removed. This is because the curvature of the positive electrode plate 5 and the negative electrode plate 10 increases due to the influence of the end portions of the positive electrode mixture layer 2 and the negative electrode mixture layer 7, and the positive electrode plate 5 and the negative electrode plate 10 expand and contract by repeating charging and discharging. It is considered that the electrode plate was easily cut off repeatedly.

  In addition, although the present Examples 1-3 use the form which connected the positive electrode lead 3 or the negative electrode lead 8 to the positive electrode plate 5 and the negative electrode plate 10, the form of current collection to the battery container exterior of an electrode plate is limited to this. Instead, the exposed portion of the current collector may be exposed at both ends of the electrode group, and the current collector terminal plate may be connected thereto by welding or the like.

  The non-aqueous secondary battery according to the present invention is formed by coating and forming so that the end of only the winding start side in the winding direction becomes thinner toward the end when the mixture layer is formed. Therefore, it is possible to suppress the current collector from being cut off due to many impacts, and it is useful as a portable power source or the like for which reliability during use is desired.

DESCRIPTION OF SYMBOLS 1 Positive electrode collector 2 Positive electrode mixture layer 3 Positive electrode lead 4 Positive electrode protection tape 5 Positive electrode plate 6 Negative electrode collector 7 Negative electrode mixture layer 8 Negative electrode lead 9 Negative electrode protection tape 10 Negative electrode plate 11 Porous insulator 12 Electrode group 13 Battery Case 14 Sealing plate 15 Sealing gasket 16 Insulating plate 20 Paint supply tank 21 Paint supply pump 22 Pipe 23 Paint supply valve 24 Paint supply valve closed line 25 Paint supply valve open line 26 Pipe line closing device 27 Paint supply valve drive device 28 Application Die 29 Application roller

Claims (7)

  A positive electrode plate having a positive electrode mixture layer formed by applying a positive electrode mixture coating material obtained by kneading and dispersing at least a lithium-containing composite oxide active material, a conductive material, and a binder in a dispersion medium. Alternatively, from a negative electrode plate in which a negative electrode mixture coating material obtained by kneading and dispersing an active material made of a material capable of holding lithium and a binder in a dispersion medium is applied onto a negative electrode current collector to form a negative electrode mixture layer An electrode plate for a non-aqueous secondary battery, wherein only a winding start side end in a winding direction of a positive electrode mixture layer or a negative electrode mixture layer formed on the positive electrode current collector or the negative electrode current collector is terminated. An electrode plate for a non-aqueous secondary battery, characterized in that the electrode plate is formed to have a slope that becomes thinner toward the portion.   A method for producing an electrode plate for a non-aqueous secondary battery in which an electrode mixture paint is intermittently applied to a continuously running current collector using a die coater, and the coating supply valve opening speed is applied at the start of coating. Applying and forming an inclination that becomes thinner toward the end of the coating start end in the positive electrode mixture layer and / or negative electrode mixture layer after coating and drying by lowering the closing speed of the paint supply valve when the work is stopped The manufacturing method of the electrode plate for non-aqueous secondary batteries characterized by these.   3. The method for producing an electrode plate for a non-aqueous secondary battery according to claim 2, wherein a direct acting type and a rotary type air cylinder capable of adjusting the inflow and outflow amount of air are used to open and close the paint supply valve.   3. A method for producing an electrode plate for a non-aqueous secondary battery according to claim 2, wherein a motor with variable forward and reverse speeds is used to open and close the paint supply valve.   3. The method for producing an electrode plate for a non-aqueous secondary battery according to claim 2, wherein a linear motion obtained by converting a forward and reverse speed variable motor by a ball screw is used for opening and closing the paint supply valve.   3. A method of manufacturing an electrode plate for a non-aqueous secondary battery according to claim 2, wherein a linear drive device configured to open and close the paint supply valve by a magnet and a coil and perform a direct drive motion whose speed is variable by electromagnetic force is used. .   A positive electrode plate in which a positive electrode mixture layer containing at least a composite lithium oxide as an active material is intermittently applied and formed in the width direction by providing an uncoated portion in the longitudinal direction of the positive electrode current collector, or the longitudinal direction of the negative electrode current collector A negative electrode plate provided with an uncoated portion and a negative electrode mixture layer containing at least a material capable of holding lithium as an active material, and at least one of the positive electrode current collector or the negative electrode current collector or the negative electrode current collector. A positive electrode plate and a negative electrode plate having a slope that becomes thinner as only the end portion on the winding start side in the winding direction of the positive electrode mixture layer or the negative electrode mixture layer formed on the electric body becomes an end portion, and a porous insulator. A non-aqueous secondary battery characterized in that an electrode group configured by use is enclosed in a battery case together with a non-aqueous electrolyte.

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