JP2008103098A - Manufacturing method of electrode plate for nonaqueous electrolyte secondary battery and its manufacturing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the manufacturing method and the manufacturing equipment of an electrode plate high in adhesion of an electrode active material mix layer to a metallic collector. <P>SOLUTION: The manufacturing method of the electrode plate for a nonaqueous electrolyte secondary battery is that a mix of an electrode active material is prepared by mixing and dispersing at least the electrode active material and a binder in a solvent, prepared electrode active material mix paint is applied to the surface of the collector, a coating film of the electrode active material is formed, dried while removing the solvent, and pressed to form the electrode active material mix layer. The manufacturing method and the manufacturing equipment of the electrode plate are that in the process heating and drying the coating film while removing the solvent, the solvent is removed by heating the electrode plate under the presence of the high temperature vapor of the solvent. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrode for a non-aqueous electrolyte secondary battery that improves the adhesion between the electrode active material mixture layer of the electrode plate for a non-aqueous electrolyte secondary battery represented by a lithium ion secondary battery and the current collector. The present invention relates to a plate manufacturing method and a manufacturing apparatus therefor.

  In recent years, portable devices and cordless devices such as AV devices, personal computers and portable communication devices have been rapidly promoted, and these electronic devices and other power drive devices for power supplies have high energy density and excellent load characteristics. Secondary batteries are desired. In particular, lithium secondary batteries are widely used as power sources for portable electronic devices having many features such as high energy density and voltage and long storage life.

A lithium secondary battery uses a negative electrode plate in which a carbonaceous material capable of occluding and releasing lithium is applied to a negative electrode on a current collector, and an active material is a composite oxide of a transition metal such as LiCoO ₂ and lithium for the positive electrode As a result, a lithium secondary battery with a high potential and a high discharge capacity has been realized by using a positive electrode plate applied to a current collector, but with the recent multifunctionalization of electronic devices and communication devices Further increase in capacity is desired.

  A negative electrode plate for a non-aqueous electrolyte secondary battery uses a carbonaceous material as a negative electrode active material, and the negative electrode active material and a binder (binder) are kneaded and dispersed in an appropriate dispersion medium to form a negative electrode mixture paint, The negative electrode mixture paint is applied onto a current collector made of a metal foil to form a negative electrode active material coating film, and then pressed to form a negative electrode active material mixture layer.

  On the other hand, a positive electrode plate for a non-aqueous electrolyte secondary battery uses a lithium composite oxide as a positive electrode active material, and the positive electrode active material, a conductive agent and a binder are kneaded and dispersed in an appropriate dispersion medium to form a positive electrode mixture paint. The positive electrode mixture paint is applied onto a current collector made of metal foil to form a positive electrode active material coating film, and then pressed to form a positive electrode active material mixture layer.

  Here, the negative electrode active material mixture layer and the positive electrode active material mixture layer coated on a current collector made of metal foil, dried and pressed are used as active materials in the electrode plate manufacturing process and the lithium secondary battery assembly process. It is required to have excellent adhesion to the current collector so that the mixture layer does not peel, fall off or crack.

Therefore, as a conventional electrode plate manufacturing method, an electrode active material mixture paint prepared by mixing and dispersing at least an electrode active material and a binder in a solvent is prepared, and an electrode active material mixture paint is applied to the surface of the current collector. After that, in the step of removing the solvent contained in the electrode active material mixture paint, as shown in FIG. 3, the heating unit 55 starts from the opposite surface of the current collector 54 to which the electrode active material coating film 53 is applied. By heating, the drying of the solvent proceeds from the surface side of the current collector 54 of the electrode active material coating film 53, and the binder is prevented from segregating to the surface side of the electrode active material coating film 53. There has been proposed a method for improving the adhesion between the active material coating film 53 and the current collector 54 (see, for example, Patent Document 1).
JP-A-9-283122

However, in the above-described prior art patent document, as shown in FIG. 3, the binder is coated with the electrode active material by heating from the opposite surface of the current collector 34 to which the coating film 53 of the electrode active material is applied. Since segregation to the surface side of the work film 53 is prevented and high adhesion strength is obtained, the traveling speed of the current collector 54 can be increased, and the drying process can be speeded up. When the current collector 54 is caused to travel in the traveling direction 62 of the current collector 54 when the electrode plate is manufactured, the surface of the current collector 54 and the electrode active material coating film 53 has a relative wind at the same speed as the travel speed. 58 occurs.

  In order to shorten the drying time in the patent document which is the prior art, when the traveling speed of the electrode plate 61 is increased and the drying speed is increased, the speed of the relative wind 58 is naturally increased. When the speed of the relative wind 58 is increased, the drying speed is further accelerated, causing the segregation of the binder, and the temperature of the coating film 53 of the electrode active material is lowered by depriving the heat of vaporization and reaches the melting temperature of the binder. Therefore, there is a problem that high adhesion strength between the electrode active material coating film 53 and the current collector 54 cannot be obtained.

  The present invention has been made in view of the above-described conventional problems. An electrode active material mixture paint prepared by preparing an electrode active material mixture in which an electrode active material and a binder are mixed and dispersed in a solvent is applied to the surface of the current collector. A method for producing an electrode plate for a non-aqueous electrolyte secondary battery in which an electrode active material coating film is formed and pressed after drying to form an electrode active material mixture layer. Non-aqueous electrolysis that facilitates reaching the melting temperature of the binder and promotes high adhesion strength and speeds up the drying process by drying while removing the solvent contained in the electrode plate through a drying process It aims at providing the manufacturing method of the electrode plate for liquid secondary batteries, and its manufacturing apparatus.

  In order to achieve the above object, the present invention applies an electrode active material mixture paint prepared on an electrode active material mixture in which at least an electrode active material and a binder are mixed and dispersed in a solvent to the surface of the current collector. A method for producing an electrode plate for a non-aqueous electrolyte secondary battery in which an electrode active material coating film is formed and pressed after drying to form an electrode active material mixture layer. Is dried while removing the solvent contained in the electrode plate through a drying process.

  According to the present invention, an electrode active material mixture prepared by mixing and dispersing an electrode active material and a binder in a solvent is applied to the surface of the current collector to form a coating film of the electrode active material A method of manufacturing an electrode plate for a non-aqueous electrolyte secondary battery that is pressed after drying to form an electrode active material mixture layer, and the electrode plate is supplied with a high-temperature vapor of a solvent and dried. By drying while removing the solvent contained in the electrode plate, the rate at which the electrode active material mixture paint dries with the relative air in the presence of the high-temperature vapor of the solvent is suppressed, and the binder is removed because it is high-temperature vapor. It is possible to ensure the melting temperature, and it is possible to obtain a high adhesion strength between the coating film of the electrode active material and the current collector and a high speed drying process.

  In the first invention of the present invention, an electrode active material mixture prepared by preparing an electrode active material mixture in which at least an electrode active material and a binder are mixed and dispersed in a solvent is applied to the surface of the current collector, and the electrode active material A method for producing an electrode plate for a non-aqueous electrolyte secondary battery in which a coating film is formed and pressed after drying to form an electrode active material mixture layer. The electrode plate is dried by supplying high-temperature vapor of a solvent. By drying while removing the solvent contained in the electrode plate through a drying step, the rate at which the electrode active material mixture paint dries with the relative air in the presence of the high-temperature vapor of the solvent is suppressed, and the high-temperature vapor Therefore, it is possible to secure a temperature at which the binder is melted, high adhesion strength between the coating film of the electrode active material and the current collector, and a high speed drying process.

In the second invention of the present invention, by supplying a high-temperature vapor of a solvent whose temperature or humidity and supply flow rate are controlled at least, the rate at which the electrode active material mixture paint dries is suppressed, and the electrode active material is applied. It is possible to obtain high adhesion strength between the film and the current collector.

  In the third invention of the present invention, in the drying step, a preheating step for bringing the electrode plate to the evaporation temperature of the solvent, a constant rate drying step for drying the electrode plate at a constant rate, and a reduction rate drying step for drying the electrode plate at a reduced rate. By being comprised, since it is high temperature steam, the temperature which fuse | melts a binder can be ensured and it becomes possible to suppress the segregation of a binder.

  According to a fourth aspect of the present invention, a transport unit that continuously transports a current collector and an electrode plate, an active material supply unit that applies a mixture paint of an electrode active material to the surface of the current collector, and an electrode plate A drying section for drying, a heating section for supplying a heat source to the drying section, a heat source section for generating a heat source for the drying section, a solvent vapor supply nozzle section for blowing a high-temperature vapor of the solvent inside the drying section, and a high-temperature vapor of the solvent A solvent supply unit for supplying the water, a detection unit for measuring the temperature inside the drying unit, a humidity detection unit for measuring the temperature inside the drying unit, a flow rate control unit for controlling the supply amount of high-temperature vapor of the solvent, It is composed of a temperature / humidity control unit that controls the temperature and humidity of the high-temperature vapor of the solvent, and a temperature control unit that controls the temperature of the heating unit. Suppresses the drying speed of the mixture paint and is a high-temperature steam. Sunda the it is possible to ensure the temperature for melting, speed of the electrode active material mixture layer and the current collector with high adhesion strength and drying process can be realized.

  In the fifth invention of the present invention, the heating part is composed of any one of an infrared heating part, a hot air heating part, an electromagnetic induction heating part, a microwave heating part, a high-frequency heating part and a combination thereof, The entire electrode plate can be rapidly heated efficiently, and the drying process can be speeded up by reaching the melting temperature of the binder in a short time.

  According to the sixth aspect of the present invention, the temperature, humidity or flow rate of the high-temperature vapor of the solvent is adjusted in accordance with the detected temperature and humidity inside the drying section, so that the solvent after the rapid heating of the electrode plate It is possible to supply the high-temperature steam at a constant temperature and humidity, and it is possible to alleviate segregation by supplying a constant evaporation temperature as the heat of vaporization of the binder contained in the electrode plate.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram of a manufacturing apparatus for drying after forming a coating film of an electrode active material by applying a mixture paint of an electrode active material on the surface of a current collector in an embodiment of the present invention. Thereafter, the electrode plate for a non-aqueous electrolyte secondary battery is formed by pressing to form an electrode active material mixture layer.

  The transport unit 26 that continuously transports the electrode plate 25 in which the current collector 4 and the electrode active material mixture paint are applied to the surface of the current collector 4 includes an unwinding unit 1 and a winding unit 21. An active material supply unit 2 for applying a mixture paint of an electrode active material on the surface of the current collector 4 between the take-out unit 1 and the winding unit 21; and a mixture paint of an electrode active material on the surface of the current collector 4 A drying unit 5 for drying the applied electrode plate 25 is disposed.

  The interior of the drying unit 5 is divided into three chambers, and a preheating drying unit 18 that processes a preheating process for causing the electrode plate 25 to reach the evaporation temperature of the solvent and a constant rate drying process that performs constant drying of the electrode plate 25 are processed. For this reason, the constant rate drying unit 19 and the reduction rate drying unit 20 for processing the rate reduction drying process for drying the electrode plate 25 at a rate reduction rate are configured. Each of the drying units 18, 19, 20 includes temperature sensors 8 a, 8 b, 8 c, 13, 22 or a humidity detection unit 14 for detecting the temperature or humidity inside the drying unit 5, and the temperature of the infrared heater 10. Further, the temperature and humidity of the high-temperature vapor of the solvent are controlled, and the electrode plate 25 is moved from the solvent vapor supply nozzle unit 12 connected to each hot air nozzle unit 6a, 6b, 6c, 6d as the heating unit 6 and the solvent supply unit 17. Heating.

First, an active material and a binder or an active material and a binder and a conductive material are put in an appropriate dispersion medium, mixed and dispersed by a disperser, adjusted to an optimum viscosity for application to the current collector 4, and kneaded. An electrode active material mixture paint is prepared and charged into the active material supply unit 2. Next, the current collector 4 wound in a coil shape is fed out from the unwinding unit 1, and a mixture paint of an electrode active material is supplied from the active material supply unit 2 and applied to the current collector 4.

  The current collector 4 coated with the electrode active material mixture paint and formed with the electrode active material coating film 3 is conveyed inside the drying unit 5 by the conveyance unit 26 and dried, and then coiled in the winding unit 21. It is wound up. Thereafter, the current collector 4 on which the electrode active material coating film 3, which is the electrode plate 25 wound around the winding portion 21, is pressed, and the electrode active material mixture layer is formed on the surface of the current collector 4. An electrode plate for a non-aqueous electrolyte secondary battery is formed.

  Further, inside the drying section 5, a preheating drying section 18 for processing a preheating drying process for increasing the temperature of the coating film 3 of the electrode active material applied as the first process to the evaporation temperature of the solvent, and a second process. As the solvent evaporates at a constant rate, heat is removed as the heat of vaporization during evaporation, and the solvent evaporates from the electrode active material coating film 3 to prevent the surface temperature of the electrode active material coating film 3 from decreasing. The constant rate drying unit 19 for processing the constant rate drying step for drying while equalizing the heating rate and the heating rate, and the amount of evaporation of the solvent as the third step is reduced, so that the coating film 3 of the electrode active material A rate-decreasing drying process is performed in which the temperature of the electrode active material coating film 3 is controlled to be controlled while the temperature of the electrode active material coating film 3 is controlled to prevent the phenomenon that the temperature rises and only the surface of the electrode active material coating film 3 is rapidly cured. The reduction rate drying unit 20 is divided into three configurations.

  In the preheating drying section 18 that processes the preheating process that is the first process, in order to reach the evaporation temperature of the solvent as soon as possible, from the hot air nozzle section 6a from the current collector 4 side continuously running by the transport section 26. The current collector 4 is heated by blowing hot air. Furthermore, the electrode active material coating film 3 is heated from the side of the infrared heater 10 to accelerate the electrode active material coating film 3 to rapidly reach the evaporation temperature of the solvent.

  Further, a temperature sensor 8 a is installed as the temperature detection unit 8 in the preheating drying unit 18, and the temperature in the preheating drying unit 18 is detected. The measured temperature is transmitted as a command signal to the hot air generator 7a, which is the heat source unit 7, by the temperature control unit 9, and the temperature of the hot air discharged from the hot air nozzle unit 6a is controlled. Further, a temperature sensor 22 is installed in the preheating drying unit 18, and the measured temperature is processed by the infrared heater control unit 11 to control the temperature of the infrared heater 10.

  In the constant rate drying part 19 which processes the constant rate drying process which is a 2nd process, the hot air is blown from the hot air nozzle part 6b from the current collector 4 side which is running continuously, and the current collector 4 is heated. Further, high temperature vapor of the solvent is sprayed from the solvent vapor supply nozzle portion 12 from the electrode active material coating film 3 side to heat the electrode active material coating film 3.

  Further, a temperature sensor 8b is installed in the constant rate drying unit 19, and the temperature in the constant rate drying unit 19 is detected. The measured temperature is processed by the temperature control unit 9 and transmitted as a command signal to the hot air generator 7b to control the temperature of the hot air discharged from the hot air nozzle unit 6b.

  Further, the high temperature vapor of the solvent released from the solvent vapor supply nozzle unit 12 detects the temperature and humidity by the temperature sensor 13 and the humidity detection unit 14 in the constant rate drying unit 19, and the temperature and humidity information is converted to temperature humidity. The control unit 15 performs arithmetic processing and transmits a command signal to the flow rate control unit 16 to control it. The solvent vapor supply nozzle unit 12 is connected to a solvent vapor supply unit 17 having a flow rate control unit 16 disposed therebetween. The best solvent vapor supply unit 17 is selected in accordance with the solvent. In the present invention, the boiler is used because the solvent is water. However, if it is an organic solvent, a seal pot can be used.

In the reduction rate drying unit 20 that processes the reduction rate drying step that is the third step, the hot air nozzle unit 6c, from the side of the current collector 4 and the side of the electrode active material coating film 3 that are continuously running for strong drying. The electrode plate 25 is heated by blowing hot air from 6d.

  Further, a temperature sensor 8c is installed in the reduction rate drying unit 20, and the temperature in the reduction rate drying unit 20 is detected. Information on the measured temperature is processed by the temperature control unit 9, and a command signal is transmitted to the hot air generator 7c to control the temperature of the hot air discharged from the hot air nozzle units 6c and 6d.

  The heat source 7 in the drying unit 5 may be one of infrared heating, hot air heating, electromagnetic induction heating, microwave heating, and high frequency heating, and a combination thereof. In this embodiment, a negative electrode plate which is one of the electrode plates of the secondary battery is cited and described as an example, but the high temperature vapor having the same component as the solvent of the electrode active material coating film is similarly applied to the positive electrode plate. Supply.

  2.5 parts by weight of styrene-butadiene copolymer rubber particle dispersion (solid content 40% by weight) as a binder (1 part by weight in terms of solid content of the binder) with respect to 100 parts by weight of artificial graphite as the negative electrode active material ), 1 part by weight of carboxymethyl cellulose as a thickener mixed with 1 part by weight of water as a thickener, water added as a dispersion medium, and stirred in a double-arm kneader to mix the negative electrode active material mixture paint Was made.

  As shown in FIG. 1, a negative electrode active material mixture paint is put into the active material supply unit 2, and the active material is formed on the surface of the current collector 4 made of a 10 μm-thick copper foil that is unwound from the unwinding unit 1. A negative electrode active material mixture paint was applied from the supply unit 2. Next, the current collector 4 on which the coating film 3 of the negative electrode active material is formed is transported by the transport unit 26 to the preheating drying unit 18 of the drying unit 5, and the infrared heater 10 controlled by the infrared heater control unit 11. The electrode plate 25 was rapidly heated by heating from the coating film 3 side of the negative electrode active material and by blowing hot air from the hot air nozzle part 6a which is the heating part 6 from the current collector 4 side.

  Further, the constant rate drying unit 19 receives the command signal from the temperature control unit 9 from the continuously running current collector 4 side and collects hot air controlled by the hot air generator 7b from the hot air nozzle unit 6b. In order to relieve the segregation of the binder contained in the coating film 3 of the negative electrode active material by heating the electric body 4, the flow rate is controlled by receiving a command signal from the temperature / humidity control unit 15 from the coating film 3 side of the negative electrode active material. A high-temperature steam of water controlled by the section 16 was sprayed from the solvent vapor supply nozzle section 12 and heated.

  Finally, in the reduction rate drying unit 20, the hot air is controlled by the hot air generator 7c that has received a command signal from the temperature control unit 9 from the current collector 4 side and the negative electrode active material coating film 3 side, and the hot air nozzle unit 6c. The electrode plate 25 was heated by blowing hot air controlled from 6d. At this time, the surface of the copper foil current collector 4 and the negative electrode active material coating film 3 having a thickness of 10 μm is dried while the relative wind 24 generated during traveling hits from the side surface at a wind speed of 2 m / sec. The electrode plate 25 was wound up by the winding unit 21. Furthermore, the electrode plate for a non-aqueous electrolyte secondary battery in which the wound electrode plate 25 was pressed to form a negative electrode active material mixture layer was taken as Example 1.

(Comparative Example 1)
The current collector 54 is sent out from the unwinding part 51 of the manufacturing apparatus as shown in FIG. 3 using a current collector made of the same negative electrode active material mixture paint and a copper foil having a thickness of 10 μm. Next, a negative electrode active material mixture paint is applied to the surface of the current collector 54 in the active material supply unit 50 to which the negative electrode active material mixture paint is supplied to form a negative electrode active material coating film 53. Then, it is conveyed to the drying unit 60.

The temperature was measured by the temperature sensor 56 installed in the drying unit 60, a command command was transmitted from the temperature control unit 57, and the temperature of the hot air was controlled by the heat generation unit 59. Further, drying was performed by blowing hot air from the heating unit 55 connected to the heat generation unit 59 from the collector 54 side of a copper foil having a thickness of 10 μm. On the surface of the current collector 54 and the coating film 53 of the negative electrode active material, the electrode plate 61 dried while the relative wind 58 generated during traveling hits from the side surface at a wind speed of 2 m / sec. It was. Then, the electrode plate for non-aqueous electrolyte secondary batteries in which the wound electrode plate 61 was pressed to form a negative electrode active material mixture layer was used as Comparative Example 1.

(Table 1) shows the results of evaluating the adhesion strength between the electrode plate current collector and the electrode active material mixture layer in the non-aqueous electrolyte secondary battery electrode plate produced as described above. As an evaluation, a peel test is performed. A tape is applied to the negative electrode plate produced in Example 1 and Comparative Example 1 and cut out to a width of 10 mm, and then the current collector and the electrode active material mixture layer are measured with a peeling tester that measures the tensile load by pulling the tape. Table 1 shows the comparative values with the adhesion strength measured as the peel stress. The numerical values in (Table 1) are obtained by converting a 10 mm width into a 1 m width.

  As shown in (Table 1), high-temperature water vapor is sprayed from the solvent vapor supply nozzle part as compared with the electrode plate of Comparative Example 1 in which high-temperature water vapor is blown from the solvent vapor supply nozzle part and heated and dried. It can be seen that the electrode plate of Example 1, which was heated and dried, had higher adhesion strength.

  In order to verify this difference in adhesion strength, the surface temperature of the coating film of the electrode active material when Example 1 and Comparative Example 1 were produced as shown in FIG. 2 was measured. The difference between the surface temperature 27 of the electrode active material coating film in Example 1 and the surface temperature 28 of the electrode active material coating film in Comparative Example 1 clearly appeared.

  In Example 1, the surface temperature 27 of the coating film of the electrode active material is obtained by supplying the high-temperature vapor having the same component as the solvent in the constant-rate drying unit that processes the constant-rate drying step that is the second step of drying. It is confirmed that the melting temperature of the binder exceeds 29, and it is considered that the binder is melted and the electrode active material and the current collector are firmly bound.

  On the other hand, in Comparative Example 1, since the surface temperature 28 of the coating film of the electrode active material did not reach the binder melting temperature 29 and the binder was not sufficiently melted, the electrode active material and the current collector were firmly bonded. Probably not worn. Moreover, since the constant rate drying time 30 in Example 1 and the constant rate drying time 31 in Comparative Example 1 do not change in time, the segregation of the binder due to overdrying is suppressed while Example 1 has a higher temperature. It can be said that.

  From the above results, by using the present invention, it is easy to reach the melting temperature of the binder, and the adhesion strength between the electrode active material and the current collector is increased despite the rapid heating of the electrode plate temperature. Is possible. Furthermore, when the traveling speed is increased and the drying speed is increased, the relative wind is naturally increased, and the drying speed is further accelerated, causing segregation of the binder and removing the heat of vaporization. Therefore, it is possible to prevent the temperature of the resin from becoming low and not to reach the melting temperature of the binder, and it is possible to manufacture an electrode plate with stronger adhesion strength and speed up the drying process.

According to the present invention, by supplying a high-temperature vapor having the same component as the electrode active material coating film in the drying in the second step, the adhesion between the current collector and the electrode active material coating film is excellent. It is possible to manufacture the electrode plate, which can suppress the peeling, cracking, dropping, etc. during the battery assembly process and charging / discharging, and has the effect of high energy density, excellent load characteristics, long shelf life, etc. Production is possible.

  In addition, despite the excellent adhesion between the current collector and the coating film of the electrode active material, the drying process can be speeded up, so the non-aqueous electrolyte secondary solution that enables high-speed drying with high productivity A battery electrode plate manufacturing method and manufacturing apparatus thereof are provided.

The schematic diagram of the manufacturing apparatus in embodiment of this invention Comparison diagram of surface temperature of coating film of electrode active material of Example 1 and Comparative Example 1 Schematic diagram of manufacturing equipment in the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Unwinding part 2 Active material supply part 3 Electrode active material coating film 4 Current collector 5 Drying part 6 Heating part 6a Hot air supply nozzle part 6b Hot air supply nozzle part 6c Hot air supply nozzle part 7 Heat source part 7a Hot air generator 7b Hot air generator 7c Hot air generator 8 Temperature detector 8a Temperature sensor 8b Temperature sensor 8c Temperature sensor 9 Temperature controller 10 Infrared heater 11 Infrared heater controller 12 Solvent vapor supply nozzle 13 Temperature sensor 14 Humidity detector 15 Temperature humidity controller 16 Flow Control Unit 17 Solvent Supply Unit 18 Preheating Drying Unit 19 Constant Rate Drying Unit 20 Decrease Rate Drying Unit 21 Winding Unit 22 Temperature Sensor 23 Current Direction of Current Collector 24 Relative Wind Generated When Current Collector is Running 25 Electrode plate 26 Conveying section 27 Surface temperature of electrode active material coating film in Example 1 28 Surface temperature of electrode active material coating film in Comparative Example 1 29 Binder melting temperature 30 Constant rate drying time in Example 1 31 Constant rate drying time in Comparative Example 1

Claims (6)

  At least the electrode active material and binder are mixed and dispersed in a solvent to prepare a mixture of electrode active materials. The electrode active material mixture paint is applied to the surface of the current collector to form an electrode active material coating film and then dried. A method for manufacturing an electrode plate for a non-aqueous electrolyte secondary battery, which is pressed later to form an electrode active material mixture layer, wherein the electrode plate is subjected to a drying process in which high-temperature vapor of a solvent is supplied and dried. A method for producing an electrode plate for a non-aqueous electrolyte secondary battery, wherein drying is performed while removing the solvent contained in the battery.   The method for producing an electrode plate for a non-aqueous electrolyte secondary battery according to claim 1, wherein a high-temperature vapor of a solvent whose temperature or humidity and supply flow rate are controlled is supplied.   The drying step includes a preheating step for causing the electrode plate to reach the evaporation temperature of the solvent, a constant rate drying step for drying the electrode plate at a constant rate, and a rate reduction drying step for drying the electrode plate at a reduced rate. The manufacturing method of the electrode plate for nonaqueous electrolyte secondary batteries of Claim 1.   A transport unit that continuously transports the current collector and the electrode plate; an active material supply unit that applies a mixture paint of an electrode active material to the surface of the current collector; a drying unit that dries the electrode plate; A heating unit that supplies a heat source to the drying unit, a heat source unit that generates a heat source of the drying unit, a solvent vapor supply nozzle unit that sprays a high-temperature vapor of the solvent into the drying unit, and a high-temperature vapor of the solvent A solvent supply unit, a temperature detection unit that measures the temperature inside the drying unit, a humidity detection unit that measures the temperature inside the drying unit, and a flow rate control unit that controls the supply amount of high-temperature vapor of the solvent; And a temperature / humidity control unit for controlling the temperature and humidity of the high-temperature steam of the solvent, and a temperature control unit for controlling the temperature of the heating unit. Manufacturing equipment.   5. The non-heating device according to claim 4, wherein the heating unit includes one of an infrared heating unit, a hot air heating unit, an electromagnetic induction heating unit, a microwave heating unit, and a high-frequency heating unit and a combination thereof. An apparatus for producing an electrode plate for a water electrolyte secondary battery.   5. The non-aqueous electrolyte secondary battery according to claim 4, wherein the temperature, humidity, or flow rate of the high-temperature vapor of the solvent is adjusted in accordance with the detected temperature and humidity inside the drying unit. Electrode plate manufacturing equipment.

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