JPH11260414A - Nonaqueous system secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonaqueous system secondary battery with light weight and no electrolyte leakage. SOLUTION: This nonaqueous system secondary battery comprises a laminate formed by stacking a positive electrode 2 and a negative electrode 6 through a separator 9 containing a nonaqueous electrolyte or a wound body formed by spirally winding the laminate, a current collector electrically connected to the positive electrode 2 or the negative electrode 6; and an outer case 11 for housing the laminate or the wound body and the current collector, and the current collector comprises a supporter film part made of a polymer film and a conductive film part stacked on at least one surface of the support film part, a projection is formed at one end in the lengthy direction of the current collector, polymer films capable of heat-bonding are stacked on both surfaces of the projection to form a current collecting tab, the laminate or the wound body is housed in the outer case 11 having the polymer film capable of heat- bonding on the inside, and the periphery of the outer case is heat-bonded by applying pressure through the current collecting tab to seal electrode taking out parts 12, 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous secondary battery that is lightweight and does not leak.

[0002]

2. Description of the Related Art In recent years, non-aqueous secondary batteries that can be expected to have high energy density have been actively researched and developed. For example, a lithium ion secondary battery having a positive electrode and a negative electrode containing an active material capable of inserting and releasing lithium ions. Batteries have been widely used as power sources for mobile phones and video cameras. Lithium-ion secondary batteries are conventionally available in cylindrical and rectangular shapes. The rectangular shape has excellent mounting efficiency on equipment and is very attractive for miniaturization. Or weight) is large and the battery weight is heavy, so that it was not always effective in reducing the weight.

[0003]

In order to reduce the weight of a prismatic battery, for example, when the outer case is to be changed from a conventional metal can to a lightweight polymer membrane case, a positive or negative electrode made of a metal foil or a metal piece is used. It is necessary to form a lead-out electrode take-out part for a current collecting tab which is a connection conductor with the outside of the outer case. For this reason, for example, a method has been adopted in which a polymer film case is directly thermally fused to a current collecting tab. However, there has been a problem that even after the outer case is sealed, the sealing performance of the electrode take-out portion cannot be sufficiently ensured, and the electrolyte gradually leaks from the battery.

In view of the foregoing, an object of the present invention is to provide a non-aqueous secondary battery which can be reduced in weight, has excellent sealing properties for an electrode take-out portion, and has no leakage of an electrolytic solution in order to solve the above-mentioned problems. did.

[0005]

SUMMARY OF THE INVENTION According to the present invention, when a battery is formed using a current collecting tab having a heat-fusible polymer film on the front and back surfaces, the sealing property of an electrode extraction portion is improved, and The present invention has been made with a focus on being able to suppress leakage, and the present invention provides a non-aqueous secondary battery having a positive electrode and a negative electrode including an active material capable of inserting and releasing lithium ions, wherein the positive electrode and the negative electrode include a non-aqueous electrolyte. A laminate formed by laminating via a separator or a wound body obtained by spirally winding the laminate, a rectangular current collector that conducts with the positive electrode or the negative electrode, and the laminate or the wound body and the current collector And a projecting portion provided at one end in the longitudinal direction of the current collector, and a heat-fusible polymer film on at least one of the front and back surfaces of the projecting portion. Exposing the ends and laminating to form a current collecting tab, The outer case is housed in an outer case having a heat-fusible polymer film on its side, and the laminate or the winding body is housed therein. A non-aqueous secondary battery characterized by being sealed and sealed. By sandwiching the current collecting tab in the electrode take-out portion and simultaneously applying pressure and heat, the front and back surfaces of the current collecting tab and the polymer films inside the electrode take-out portion fuse to form the current collecting tab. The electrode take-out part is tightly closed by being tightly contacted. In addition, by using a polymer film for the support portion, the thickness of the conductive film portion can be reduced, so that the current collector can be reduced in weight and the electrode can have flexibility. Furthermore, since the current collector and the current collecting tab are integrated, the connection between the current collector and the current collecting tab by welding or the like becomes unnecessary, and the time required for manufacturing can be shortened.

Further, as the heat-fusible polymer film,
It is desirable to use a polyolefin or a copolymer thereof. It can be fused at a lower temperature than other thermoplastic polymers, and has high sealing strength after fusion, so that excellent hermeticity can be obtained.

[0007] The current collector may be made of a conductive metal foil. The polymer film can be easily pressed and a high current collecting effect can be obtained.

The current collector may be composed of a support film portion made of a polymer film and a conductive film portion laminated on the support film portion. By using a polymer film for the support film portion, the current collector is given flexibility and the conductive film portion can be made thinner, so that the current collector can be reduced in weight.

It is preferable that the conductive film portion of the current collector is formed on one or both surfaces of the polymer film by any one of a vapor deposition method and a sputtering method. Since the conductive film portion can be formed as a thin film, the weight of the metal can be reduced,
The current collector can be reduced in weight.

[0010] It is preferable that the conductive film portion or the metal foil made of a metal selected from aluminum, titanium, and stainless steel or an alloy thereof is used as the current collector that is electrically connected to the positive electrode. A current collector having high conductivity and excellent corrosion resistance can be manufactured.

It is preferable that the conductive film portion or the metal foil made of a metal selected from a copper group or a platinum group or an alloy thereof be used as the current collector that is electrically connected to the negative electrode. A current collector having high conductivity and excellent corrosion resistance can be manufactured.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 is a schematic sectional view showing the structure of a non-aqueous secondary battery according to a first embodiment of the present invention. A positive electrode current collector projection 3c is provided at one end in the longitudinal direction of the rectangular positive electrode current collector 3, and a heat-fusible polymer film 4a is attached to the front and back surfaces of the positive electrode current collector projection 3c. A rectangular positive electrode 2 having a predetermined width including a positive electrode active material is stacked on the positive electrode current collector 3 having the positive electrode current collecting tab 4 which is stacked by exposing one end of the front and back surfaces of the protruding portion. The negative electrode current collector 7 is provided with a negative electrode current collector protrusion 7c at one longitudinal end of the rectangular negative electrode current collector 7, and a heat-sealable high and low surface is provided on the front and back surfaces of the negative electrode current collector protrusion 7c. A molecular film 8a is formed on the negative electrode current collector 7 having the negative electrode current collecting tab 8 laminated by exposing one end of the front and back surfaces of the negative electrode current collector projecting portion 7c. A negative electrode plate 5 is prepared by laminating a rectangular negative electrode 6 having a width of 5 mm, and a unit cell body 10 is formed by laminating the positive electrode plate 1 and the negative electrode plate 5 with a separator 9 interposed therebetween. The unit cell body 10 includes an outer case 11 composed of outer sheets 11a and 11b each including a heat-fusible polymer film on the inside,
Then, the negative electrode current collecting tab 8 is accommodated so as to be located at the negative electrode extracting section 13, and after the electrolyte is injected, the positive electrode extracting section and the negative electrode extracting section are press-bonded through the positive electrode current collecting tab and the negative electrode current collecting tab, respectively. It is put on and sealed, and a battery is manufactured.

As described above, according to the first embodiment of the present invention, by simultaneously applying pressure and heat to the positive electrode take-out portion and the negative electrode take-out portion, heat fusion of the positive electrode current collection tab and the negative electrode current collection tab is performed. The possible polymer films 4a and 8a are fused and integrated with the heat-sealable polymer film inside the outer sheets 11a and 11b, respectively. Further, the adhesion between the positive electrode current collector protrusion 3c and the polymer film 4a and the adhesion between the negative electrode current collector protrusion 7c and the polymer film 8a during pressurization and heating are determined by the polymer film 4
a and 8a are improved by fusing to the current collector protrusions 3c and 7c, respectively. By the above operation, the positive electrode take-out part and the negative electrode take-out part are closed and sealed by the polymer film in a state in which they are in close contact with the shape of the current collecting tab.

<Second Embodiment> FIG. 2 shows a second embodiment of the present invention.
It is a typical sectional view showing the structure of the nonaqueous system secondary battery in an embodiment. The length of the positive electrode current collector 3 and the negative electrode current collector 7 is increased, and the positive electrode 2 or the negative electrode 6
The first embodiment is the same as the first embodiment except that the positive electrode plate 1 and the negative electrode plate 5 are stacked so that the positive electrode 2 and the negative electrode 6 face each other with the separator 9 interposed therebetween, and wound so that the two electrode plates are not short-circuited. Thus, a battery is manufactured.

As described above, according to the second embodiment of the present invention, even when the wound body is housed in the outer case, the electrode take-out portion is sealed as in the first embodiment. Electrolyte leakage can be prevented.

<Third Embodiment> FIG. 3 is a schematic sectional view showing the structure of a non-aqueous secondary battery according to a third embodiment of the present invention. The positive electrode current collector 3 includes a positive electrode current collector conductive film portion 3.
b, a support membrane portion 3a composed of a polymer membrane, and a positive electrode current collecting tab 4
The positive electrode current collector tab is provided on the other surface of the positive electrode current collector projecting portion 3c without the support film portion 3a, on the positive electrode current collector conductive film portion 3b.
Are partially exposed to form a polymer film 4a. In addition, the negative electrode current collector 7 includes a negative electrode current collector conductive film portion 7b, a support film portion 7a made of a polymer film, and a negative electrode current collector tab 8, and the negative electrode current collector tab is provided with a negative electrode current collector protrusion. On the other surface of the portion 7c where the support film portion 7a is not provided, the polymer film 7a is laminated by partially exposing the negative electrode current collector conductive film portion 7b. A rectangular positive electrode 2 having a predetermined width including a positive electrode active material is laminated on a positive electrode current collector conductive film portion 3b of a positive electrode current collector 3 to produce a positive electrode plate 1 and a predetermined positive electrode including a negative electrode active material. A rectangular negative electrode 6 having a width is connected to a negative electrode current collector 7.
A negative electrode plate 5 is formed by applying the negative electrode current collector on the negative electrode current collector conductive film portion 7b, and the positive electrode plate 1 and the negative electrode plate 5 are laminated with a separator 9 interposed therebetween, to constitute a unit cell body 10. The unit cell body 10 has an outer case 11 composed of outer sheets 11a and 11b each including a heat-fusible polymer film on the inner side, a positive electrode current collecting tab 4 in a positive electrode extracting section 12, and a negative electrode current collecting tab 8 in a negative electrode extracting section. The positive electrode take-out part and the negative electrode take-out part are housed so as to be located in the part 13, and are heat-sealed and sealed via a positive electrode current collecting tab and a negative electrode current collecting tab, respectively, to manufacture a battery.

As described above, according to the third embodiment of the present invention, by forming the current collector from the conductive film portion and the support film portion, the support film portion forming the current collector is formed. Since the same heat-fusible polymer film as the polymer film laminated on the front and back surfaces of the current collecting tab can be used as the polymer film of the current collecting tab, the polymer film is formed only on one of the front and back surfaces of the current collecting tab. What is necessary is just to laminate.
Therefore, the time required for manufacturing can be shortened. In addition, by using a polymer film for the support film portion of the current collector, the current collector can be reduced in weight, and thus the battery can also be reduced in weight.

Here, as the heat-fusible polymer film used in the present invention, polyolefin or a copolymer thereof can be used, but it is preferable to use polypropylene, polyethylene, an ethylene ionomer, etc. It is desirable to use these as the polymer film of the support film portion. In addition, the thickness of the film is 0.5 to 100 μm,
Preferably it is 1 to 20 μm.

In the conductive film portion used in the present invention, a metal selected from aluminum, titanium and stainless steel or an alloy thereof is used for the positive electrode plate, and a copper or platinum group metal is used for the negative electrode plate.
For example, a metal or an alloy thereof selected from copper, gold, silver, ruthenium, rhodium, palladium, osmium, iridium, platinum and the like can be used, but it is preferable to use aluminum for the positive electrode plate and copper for the negative electrode plate. .

Further, as a method of manufacturing a conductive film portion used in the present invention, a conductive film portion made of a conductive metal is formed on one or both surfaces of a support film portion made of a polymer film by vapor deposition or sputtering. A lamination method is desirable. The thickness of the conductive film portion is 0.05 to 10 μm, preferably 0.1 to 5 μm.

Further, a metal foil may be used for the conductive film portion of the current collector used in the present invention. For the metal foil, the positive electrode plate is made of a metal selected from aluminum, titanium and stainless steel or an alloy thereof, and the negative electrode plate is made of a copper group or a platinum group, for example, copper, gold, silver, ruthenium, rhodium, palladium. A foil made of a metal or an alloy thereof selected from osmium, iridium, platinum and the like is preferable. Further, the thickness of the metal foil is preferably 1 to 10 μm.

Further, the material of the outer case used in the present invention only needs to have a heat-fusible polymer film inside.
Consisting of a polymer film such as polyolefin and polyester,
Alternatively, it is desirable to use a laminated film composed of polyolefin, polyester, and metal, or a metal or alloy having a coated polyolefin film.

As the positive electrode material used as the positive electrode active material of the non-aqueous secondary battery of the present invention, any conventionally known materials can be used. For example, Li _x CoO ₂ , Li _x NiO ₂ , M
nO ₂ , LiMnO ₂ , Li _x Mn ₂ O ₄ , Li _x Mn
_2-y O ₄ , α-V ₂ O ₅ , TiS _{2 and the} like.

Further, as the negative electrode active material of the non-aqueous secondary battery of the present invention, known materials such as graphite, calcined carbonaceous material, silicon and silicon compound can be used.

The non-aqueous electrolyte used in the present invention comprises:
A non-aqueous electrolyte in which a lithium compound is dissolved in an organic solvent, or a polymer solid electrolyte in which an organic solvent in which a lithium compound is dissolved in a polymer is held can be used. The non-aqueous electrolyte is prepared by appropriately combining an organic solvent and an electrolyte, and any of these organic solvents and electrolytes can be used as long as they are used for this type of battery. Examples of the organic solvent include propylene carbonate, ethylene carbonate, vinylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, 1,2-dimethoxyethane, 1,2-diethoxyethane methylformate, butyrolactone, tetrahydrofuran and 2-methyl Tetrahydrofuran, 1-3 dioxofuran, 4-methyl-1,3-dioxofuran, diethyl ether, sulfolane, methylsulfolane, acetonitrile, propionitrile, butyronitrile, valeronitrile, benzonitrile, 1,2-dichloroethane, 4-methyl-2 -Pentanone, 1,4-dioxane, anisole, diglyme, dimethylformamide,
Dimethyl sulfoxide and the like. These solvents are
The species can be used alone or two or more can be used in combination. As the electrolyte, for example, LiCl
O ₄ , LiAsF ₆ , LiPF ₆ , LiBF ₄ , LiB (C
_{6 H 5) 4, LiCl,} LiBr, LiI, LiCH 3 SO
₃ , LiCF ₃ SO ₃ , LiAlCl _{4 and the} like. One of these can be used alone, or two or more can be used in combination.

Further, as the polymer solid electrolyte used in the present invention, polyvinylidene fluoride, vinylidene fluoride-
It is also possible to use a polymer such as a tetrafluoroethylene copolymer, polyethylene oxide, polyacrylonitrile, or polypropylene oxide in which the above non-aqueous electrolyte is retained and plasticized to polymerize the polymer. When a polymer solid electrolyte is used for the non-aqueous secondary battery of the present invention, a separator is not required, and a positive electrode plate and a negative electrode plate are stacked via the polymer solid electrolyte to form a unit cell body.

As the separator of the non-aqueous secondary battery of the present invention, a porous insulating sheet such as porous polyethylene can be used.

Further, the first, second and third aspects of the present invention described above.
In the embodiment, the battery outer case is formed in a rectangular shape, but the present invention is not limited to this, and the same effect can be obtained even when the battery is formed in a cylindrical outer case.

Also, the first, second and third aspects of the present invention described above.
In an embodiment of the present invention, the current collecting tab is integrated with the current collector,
Although the positive electrode plate or the negative electrode plate is formed, the present invention is not limited to this, and the positive electrode plate or the negative electrode plate may be formed by making the current collecting tab and the current collector independent. Using a method such as crimping, welding, caulking, or bonding with a conductive adhesive, an independent collector is provided so that the exposed conductive film portion of the current collector tab and the exposed conductive film portion of the current collector come into contact with each other. Even when the positive electrode plate or the negative electrode plate is configured by fixing or holding the current tab on the current collector, the same effects as in the first, second, and third embodiments are obtained.

[0030]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

[0031]

EXAMPLE 1 10 g of polyvinylidene fluoride (PVDF), 100 g of natural carbon powder having an average particle diameter of 7 μm,
A paste is prepared by adding 2-pyrrolidone (NMP),
This was applied to both sides of a copper foil having a thickness of 15 μm, one end having a width of 3 mm and a length of 120 mm, and having a width of 50 mm and a length of 500 mm, leaving a rectangular portion at the above-mentioned one end, followed by drying and calendering. Thus, a negative electrode coating film having a thickness of 90 μm and a density of 1.2 was obtained. An 18 μm-thick polyethylene film was pressure-bonded to the front and back surfaces of the copper foil on the end without the coating film, and the end of the current collector was used as a negative electrode current collection tab.

For the positive electrode, a paste was prepared by adding NMP to 6 g of acetylene black and 6 g of PVDF to 88 g of lithium cobaltate, and was made into a paste having a thickness of 20 μm, one end having a width of 3 mm and a length of 20 mm having a width of 50 mm. Length 500mm
On both sides of the aluminum foil, leaving a rectangular portion at the above-mentioned one end, and after drying, calender pressing to give a thickness of 90
A coating film for a positive electrode having a μm and a density of 2.4 was obtained. An 18 μm-thick polyethylene film was pressed on an aluminum foil at the end without the coating film, and the end of the current collector was used as a positive electrode current collecting tab.

The separator has a width of 52 mm and a length of 540 m.
m, using two microporous polyethylene membranes of 30μm thickness, winding while preventing short-circuiting of both electrodes, so that the negative electrode current collecting tab protrudes in one direction of the wound body and the positive electrode current collecting tab in the opposite direction,
A wound battery body was obtained.

The wound battery body was formed as an outer case by two laminated films in which a polypropylene layer (thickness 30 μm) and a polyethylene terephthalate layer (thickness 30 μm) were laminated via an aluminum layer (thickness 10 μm). Then, the laminate was sandwiched from above and below with the polypropylene layer facing, and the peripheral edges of the three opposing laminate films were heat-sealed. Further, an electrolytic solution was added from the remaining one, and the remaining one was heat-sealed and sealed. The electrolyte was a mixed solvent of ethylene carbonate and dimethyl carbonate (volume ratio 1: 1) containing lithium hexafluorophosphate at a concentration of 1 mol.
/ l was used.

For this battery, the current density was 2 mA / cm
^{When the} battery was charged and discharged in the range of 4.2 to 2.5 V at ² , the capacity was 1140 mAh. This battery did not leak even if left for one month (in an open circuit state). .

[0036]

Comparative Example 1 A battery was manufactured in the same manner as in Example 1 except that a positive electrode current collecting tab and a negative electrode current collecting tab were formed without applying a polyethylene film to the uncoated ends of the positive and negative electrode current collectors, respectively. Was configured. However, the electrolyte did not function as a leaking battery from the electrode take-out portion.

[0037]

Example 2 Using a vacuum deposition apparatus, one end was made into a rectangular shape having a width of 3 mm and a length of 20 mm, a width of 50 mm, a length of 110 mm, and a thickness of 1.
An 8 μm polyethylene film on both sides of which 1 μm of aluminum was deposited was used as a current collector for a positive electrode, and a 1 μm copper film was used as a current collector for a negative electrode. Natural carbon powder 1 with average particle size of 7 μm
00g to polyvinylidene fluoride (PVDF) 10g, N-
Methyl-2-pyrrolidone (NMP) was added to prepare a paste, which was applied to both surfaces of the polyethylene film on which copper was deposited, leaving a length of 10 mm from one end surface, and dried.
Calender pressing, thickness 90μm, density 1.2
A negative electrode coating film was obtained. At the end without the coating, a thickness of 18μ
m polyethylene film was pressed onto the copper layer, and the end was used as a negative electrode current collecting tab.

For the positive electrode, a paste was prepared by adding NMP to 6 g of acetylene black and 6 g of PVDF to 88 g of lithium cobalt oxide, and the paste was applied to both sides of the polyethylene film on which an aluminum layer was deposited by a length of 10 mm from one end face.
After coating, the coating was dried after calendering to obtain a positive electrode coating film having a thickness of 90 μm and a density of 2.4. At the end without the coating film, a polyethylene film having a thickness of 18 μm was pressed on the aluminum layer, and the end was used as a positive electrode current collecting tab.

The separator has a width of 52 mm and a length of 540 m.
m, using two microporous polyethylene membranes of 30μm thickness, winding while preventing short-circuiting of both electrodes, so that the negative electrode current collecting tab protrudes in one direction of the wound body and the positive electrode current collecting tab in the opposite direction,
A wound battery body was obtained.

The wound battery body was formed as an outer case by two laminated films in which a polypropylene layer (thickness 30 μm) and a polyethylene terephthalate layer (thickness 30 μm) were laminated via an aluminum layer (thickness 10 μm). Then, the laminate was sandwiched from above and below with the polypropylene layer facing, heat-sealed around the three opposing laminated films, and an electrolyte was added from the remaining one, and then the other was heat-sealed and sealed. The electrolyte was a mixture of ethylene carbonate and dimethyl carbonate (volume ratio 1: 1) containing lithium hexafluorophosphate at a concentration of 1 mol / mol.
What was added so that it might become 1 was used.

For this battery, the current density was 2 mA / cm
^{When the} battery was charged and discharged in the range of 4.2 to 2.5 V at ² , the capacity was 230 mAh. This battery did not leak even if left for one month (in an open circuit state). .

[0042]

As described above, a current collector having a current-collecting tab on one end and a heat-fusible polymer film on the front and back surfaces, and an outer package having a heat-fusible polymer film on the inside. When the battery is configured using the case, the polymer film on the inner side of the outer case and the polymer films on the front and back surfaces of the current collecting tab are fused by heat-sealing the peripheral portion of the outer case, and the electrode take-out portion is formed. Since the container is sealed, leakage of the electrolyte from the electrode take-out portion can be prevented. Furthermore, since a polymer film support is used for the current collector, the battery is provided with flexibility, which makes it easy to handle even if the battery is made thinner, and reduces the weight of the battery.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a structure of a non-aqueous secondary battery according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a structure of a non-aqueous secondary battery according to a second embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a structure of a non-aqueous secondary battery according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode plate, 2 Positive electrode, 3 Positive electrode current collector, 3a Positive electrode current collector conductive film part, 3b Support film part, 3c Positive electrode current collector protruding part, 4 Positive current collecting tab, 4a Polymer film 5 Negative electrode plate, Reference Signs List 6 negative electrode, 7 negative electrode current collector, 7a negative electrode current collector conductive film portion, 7b support film portion 7c negative electrode current collector protrusion, 8 negative electrode current collector tab, 8a polymer film 9 separator, 10 cell body, 11 Outer case, 11a Upper outer sheet, 11b Lower outer sheet, 12 Positive electrode take-out section, 13 Negative electrode take-out section.

Claims (4)

[Claims] 1. A non-aqueous secondary battery having a positive electrode and a negative electrode containing an active material capable of inserting and releasing lithium ions,
A laminate formed by laminating a positive electrode and a negative electrode via a separator containing a non-aqueous electrolyte or a wound body obtained by spirally winding the laminate, a rectangular current collector electrically connected to the positive electrode or the negative electrode, and the laminate A body or a wound body and an outer case for accommodating the current collector, provided with a protrusion at one end in the longitudinal direction of the current collector, and a heat-fusible polymer film on the front and back surfaces of the protrusion. Exposing at least one outer end portion of the front and back surfaces to form a current collecting tab by laminating, and housing the laminate or the winding body in an outer case having a heat-fusible polymer film inside, A non-aqueous secondary battery in which the electrode take-out portion is hermetically sealed by heat-sealing the outer peripheral portion of the outer case via the current collecting tab. 2. The non-aqueous secondary according to claim 1, wherein the current collector comprises a support film portion made of a polymer film and a conductive film portion laminated on the support film portion. battery. 3. The current collector electrically connected to the positive electrode, wherein the conductive film portion or the metal foil made of a metal selected from aluminum, titanium, and stainless steel or an alloy thereof is used. The non-aqueous secondary battery according to 1. 4. The collector according to claim 1, wherein the current collector electrically connected to the negative electrode comprises the conductive film or the metal foil made of a metal selected from a copper group or a platinum group or an alloy thereof. The non-aqueous secondary battery according to 1.