JP7544679B2 - Tab lead and non-aqueous electrolyte device - Google Patents

Description

The present invention relates to the technical field of tab leads in which a film portion is attached to a lead terminal, and non-aqueous electrolyte devices equipped with the same.

Non-aqueous electrolyte devices include, for example, lithium ion batteries and lithium ion capacitors. Lithium ion batteries have the function of charging and discharging by the movement of lithium ions between a positive electrode and a negative electrode, while lithium ion capacitors have the function of charging and discharging in a structure that has a positive electrode of an electric double layer and a negative electrode that uses a carbon-based material that can adsorb lithium ions.

Such non-aqueous electrolyte devices include, for example, laminate types used as in-vehicle batteries or storage batteries, in which electrodes and an electrolytic solution or solid electrolyte are sealed inside a bag-shaped laminate material. In laminate-type non-aqueous electrolyte devices, power is taken out by a tab lead, one end of which is connected to an electrode arranged inside the laminate material, and the other end of which is exposed to the outside of the laminate material and connected to a bus bar or the like that serves as a connection terminal for an external device.

The tab lead has a lead terminal for extracting power, and a film portion that is in close contact with the lead terminal and the laminate material to seal the laminate material and insulate the lead terminal from the laminate material. Some lead terminals are constructed with a coating covering the surface of a terminal body made of a metal material. In non-aqueous electrolyte devices, the film portion of the tab lead is thermocompression bonded to seal the laminate material.

To ensure good performance of non-aqueous electrolyte devices, such tab leads require high sealing performance of the laminate material, high insulation between the lead terminal and the laminate material, long-term resistance to electrolytes, adhesion between the lead terminal and the film portion, and good weldability of the lead terminal to electrodes, etc. In addition, the lead terminals of tab leads need to be coated with a coating to ensure rust resistance of the terminal body, so the coating needs to be highly corrosion resistant.

Therefore, various proposals have been made for conventional non-aqueous electrolyte devices to meet the requirements for lead terminals as described above (see, for example, Patent Documents 1 and 2).

In the tab lead described in Patent Document 1, the coating of the lead terminal is formed as a composite coating layer by applying a treatment liquid containing a resin component including polyacrylic acid and a metal salt, and the surface is treated with a non-chromium material to take into consideration the problem of environmental pollution, and a coating with excellent resistance to hydrofluoric acid is formed to improve corrosion resistance.

In the tab lead described in Patent Document 2, the coating of the lead terminal is formed as a composite coating layer by spraying a treatment liquid containing a resin component including polyacrylic acid and polyacrylic acid amide and a metal salt, and the surface is treated with a non-chromium material in consideration of the problem of environmental pollution, forming a coating with excellent resistance to hydrofluoric acid, thereby improving corrosion resistance.

JP 2006-128096 A JP 2011-81992 A

In the lead terminals of tab leads, in addition to the need to ensure high corrosion resistance in the coating as described above, it is also necessary to ensure high adhesion between the lead terminals and the film portion.

By ensuring high adhesion between the lead terminals and the film portion, no gaps are formed between the lead terminals and the film portion, preventing leakage of electrolyte and other liquids sealed inside the laminate material, ensuring sealing properties and ensuring good performance of the non-aqueous electrolyte device.

Therefore, the present invention aims to provide high adhesion between the lead terminal and the film portion and ensure long-term resistance to electrolytes, etc.

First, a tab lead according to the present invention is a tab lead used in a laminate-type non-aqueous electrolyte device in which at least an electrolytic solution or a solid electrolyte is sealed inside a laminate material, the tab lead comprising: a lead terminal having a terminal body formed of a metal material and a coating covering a surface of the terminal body; and a pair of film parts which are adhered to both sides of the lead terminal and to the laminate material to seal the laminate material, the film parts being provided with an adhesion layer having an acid-modified polyolefin as a base resin on the lead terminal side, the coating containing the same components as the base resin of the adhesion layer, the coating being a surface treatment coating containing a water-soluble zirconium salt and a water-soluble or water-dispersible acrylic resin, the water-soluble zirconium salt being 0.8 to 300 mg per square meter in terms of zirconium by mass, the water-soluble or water-dispersible acrylic resin ... It is adjusted to mg KOH/g and has a solid content of 1.0 to 600 mg per square meter on a mass basis.

As a result, the adhesion layer, in which the base resin, polyolefin, is acid-modified, is adhered to both sides of the coating of the lead terminal, which contains the same components as the acid-modified portion of the base resin of the adhesion layer. This also increases the corrosion resistance of the coating and increases its affinity for the adhesion layer.

Secondly, in the tab lead according to the present invention described above, it is desirable that the adhesive layer has acrylic acid-modified polypropylene or polyethylene as the base resin.

This ensures that the adhesion layer contains the same acrylic components as the coating.

Thirdly, in the tab lead according to the present invention described above, it is desirable that the film portion be provided with a second adhesive layer on the side of the laminate material, the second adhesive layer being made of a base resin made of the same material as the laminate material.

This increases the affinity between the second adhesive layer and the laminate material.

Fourthly, in the tab lead according to the present invention described above, it is desirable that the second adhesive layer has polypropylene or polyethylene as the base resin.

This allows the second adhesive layer to be made of a material that has a high affinity with the laminate material. In addition, if polypropylene is used, the second adhesive layer is made of a material that is difficult for moisture to pass through.

Fifthly, the nonaqueous electrolyte device according to the present invention is a laminate-type nonaqueous electrolyte device in which at least an electrolytic solution or a solid electrolyte is sealed inside a laminate material and a tab lead is provided, the tab lead includes a lead terminal having a terminal body formed of a metal material and a coating covering a surface of the terminal body, and a pair of film parts that are adhered to both sides of the lead terminal and to the laminate material to seal the laminate material, the film parts are provided with an adhesion layer having an acid-modified polyolefin as a base resin on the lead terminal side, the coating contains the same components as the base resin of the adhesion layer, the coating is a surface treatment coating containing a water-soluble zirconium salt and a water-soluble or water-dispersible acrylic resin, the water-soluble zirconium salt is 0.8 to 300 mg per square meter in terms of zirconium by mass, the water-soluble or water-dispersible acrylic resin has an acid value of 150 to 740 mgKOH/g in solid content and a hydroxyl value of 24 to 240 mgKOH/g in solid content, It is adjusted to mg KOH/g and has a solid content of 1.0 to 600 mg per square meter on a mass basis.

As a result, in the tab lead, the adhesion layer, in which the base resin, polyolefin, is acid-modified, is adhered to both sides of the coating of the lead terminal, which contains the same components as the acid-modified portion of the base resin of the adhesion layer. This also increases the corrosion resistance of the coating and increases its affinity for the adhesion layer.

According to the present invention, the adhesion layer, in which the base resin, polyolefin, is acid-modified, is adhered from both sides to the coating of the lead terminal, which contains the same components as the acid-modified portion of the base resin of the adhesion layer. This increases the affinity between the adhesion layer of the film portion and the coating of the lead terminal, providing high adhesion between the lead terminal and the film portion and ensuring long-term resistance to electrolytes, etc.

2 to 4 show an embodiment of the present invention, and this figure is a front view of a nonaqueous electrolyte device. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 13 is a diagram showing the measurement results regarding the adhesion between the coating of the lead terminal and the first adhesive layer of the film portion. FIG.

Below, the embodiments for implementing the tab lead and non-aqueous electrolyte device of the present invention will be described with reference to the attached drawings.

<Schematic Configuration of Nonaqueous Electrolyte Device>
First, the schematic configuration of a lithium ion battery will be described as an example of a laminated nonaqueous electrolyte device using tab leads (see FIGS. 1 and 2).

The scope of application of the nonaqueous electrolyte device of the present invention is not limited to lithium ion batteries, and the present invention can also be applied to other nonaqueous electrolyte devices such as laminated lithium ion capacitors.

The non-aqueous electrolyte device has a laminate material with an electrolyte solution or the like sealed inside and a tab lead with a portion protruding from the laminate material to the outside. In the following explanation, the direction in which the tab lead protrudes from the laminate material is referred to as "upward," and the directions indicated are front-back, up-down, left-right, and right-left.

However, the directions of front, back, up, down, left and right shown below are for the convenience of explanation, and the implementation of the present invention is not limited to these directions.

The non-aqueous electrolyte device 100 has a bag-shaped laminate material 101, various parts enclosed inside the laminate material 101, and tab leads 1, 1 partly protruding from the laminate material 101 (see Figure 1).

The laminate material 101 is cylindrical with the upper end formed as a sealing portion 102. The laminate material 101 has, for example, a three-layer structure, with an outer layer 101a and an inner layer 101b, each made of a resin material, laminated on both sides of a metal layer 101c (see FIG. 2). For example, polyethylene terephthalate is used as the outer layer 101a, for example, polypropylene or polyethylene is used as the inner layer 101b, and for example, aluminum is used as the metal layer 101c.

Inside the laminate material 101, an electrolyte solution 103 is enclosed, and a positive electrode 104, a negative electrode 105, and a separator 106 are arranged. The positive electrode 104 and the negative electrode 105 are immersed in the electrolyte solution 103, and the separator 106 separates the space in which the positive electrode 104 is arranged from the space in which the negative electrode 105 is arranged. For example, aluminum is used as the positive electrode 104, and for example, nickel, copper, or an alloy thereof is used as the negative electrode 105. Note that a solid electrolyte may be used instead of the electrolyte solution 103.

<Tab lead configuration>
Next, the configuration of the tab lead 1 will be described (see Figs. 2 and 3). A pair of tab leads 1 are provided, one of which is connected to the positive electrode 104 and functions as the positive electrode in the nonaqueous electrolyte device 100, and the other of which is connected to the negative electrode 105 and functions as the negative electrode in the nonaqueous electrolyte device 100.

The tab lead 1 is composed of a thin plate-shaped lead terminal 2 and a pair of film portions 3, 3 that are attached to both sides of the lead terminal 2. A portion of the outer peripheral surface of the tab lead 1 is attached to the sealing portion 102, and the upper end portion protrudes upward from the laminate material 101.

The lead terminal 2 is formed in a thin plate shape with a thickness of, for example, 50 μm to 1000 μm. The lower end of the lead terminal 2 is provided as an electrode connection portion 2a and is connected to the positive electrode 104 or the negative electrode 105 by, for example, welding. The upper end of the lead terminal 2 is provided as an external terminal portion 2b exposed to the outside from the laminate material 101 and is connected to a connection terminal (bus bar) (not shown) of an external device by, for example, welding.

The lead terminal 2 is constructed by covering the surface of a terminal body 4 made of a metal material with a coating 5. The terminal body 4 is made of, for example, nickel, aluminum, copper, or stainless steel. The coating 5 is formed as a composite coating of an acrylic acid copolymer and a zirconium salt, using, for example, an acrylic acid copolymer as the base resin.

The zirconium salt contained in the coating 5 ensures good electrical conductivity, and ensures high electrical conductivity and high weldability between the electrode connection portion 2a and the positive electrode 104 or negative electrode 105, as well as high electrical conductivity and high weldability between the external terminal portion 2b and the connection terminal of the external device.

Specifically, the coating 5 is a surface treatment coating containing a water-soluble zirconium salt and a water-soluble or water-dispersible acrylic resin, and is prepared so that the water-soluble zirconium salt has a zirconium content of 0.8 to 300 mg per square meter on a mass basis, and the water-soluble or water-dispersible acrylic resin has a solid content acid value of 150 to 740 mgKOH/g and a solid content hydroxyl value of 24 to 240 mgKOH/g, and a solid content of 1.0 to 600 mg per square meter on a mass basis. The coating 5 thus prepared is applied to the surface of the metal material (lead terminal 2) that will become the terminal, and is heated and dried to form the surface treatment coating.

There are no particular limitations on the method of applying the surface treatment agent, so long as the components of the coating 5 formed are within the above ranges. For example, roll coating, bar coating, spray treatment, immersion treatment, etc. can be used.

The method of heating the surface treatment agent is not particularly limited, but examples include oven drying and forced circulation of hot air. Heat drying conditions can be, for example, 40 to 200°C for 2 to 60 seconds.

The film parts 3, 3 are adhered to the lead terminal 2 from both sides and also to the inner surface of the sealing part 102 of the laminate material 101, sealing the laminate material 101 and preventing leakage of the electrolyte 103 and other liquids sealed inside the laminate material 101. The film parts 3, 3 are also interposed between the lead terminal 2 and the laminate material 101, and have the function of ensuring insulation between the lead terminal 2 and the laminate material 101.

The film portions 3, 3 are formed in a shape that extends in a direction perpendicular to the lead terminal 2, and are adhered to both sides of the lead terminal 2 in the thickness direction. Therefore, the film portions 3, 3 are adhered to the coating 5 of the lead terminal 2 from both sides. The thickness of the film portion 3 is, for example, 50 μm to 150 μm, and the central portion in the longitudinal direction is adhered to the lead terminal 2.

The film portion 3 has, for example, a three-layer structure, with a first adhesive layer 6 and a second adhesive layer 7 laminated on both sides of an intermediate layer 8. However, the number of layers in the film portion 3 is arbitrary as long as it has a structure of two or more layers.

The first adhesive layer 6 has a thickness of, for example, 25 μm to 100 μm. The first adhesive layer 6 is located on the lead terminal 2 side and is formed with acid-modified polyolefin as the base resin, and the base resin is, for example, acrylic acid-modified. The first adhesive layer 6 uses, for example, polypropylene or polyethylene as the polyolefin. Therefore, the first adhesive layer 6 uses, for example, acrylic acid-modified polypropylene or acrylic acid-modified polyethylene as the base resin.

In this way, the first adhesive layer 6 uses acrylic acid-modified polypropylene or acrylic acid-modified polyethylene as the base resin, and is configured to contain carboxylic acid, which is the same component as the acrylic acid copolymer, which is the base resin of the coating 5. The base resin of the first adhesive layer 6 may be, for example, maleic acid-modified polypropylene or maleic acid-modified polyethylene, and in this case, a resin containing carboxylic acid is used as the base resin of the coating 5, and it is desirable that the first adhesive layer 6 and the coating 5 contain the same component. In addition to a resin containing carboxylic acid, a maleic acid copolymer or maleic anhydride-modified polyethylene may be used as the base resin of the coating 5.

The second adhesive layer 7 has a thickness of, for example, 25 μm to 100 μm, and is located on the opposite side of the first adhesive layer 6 with the intermediate layer 8 sandwiched therebetween. The second adhesive layer 7 is formed of the same material as the first adhesive layer 6, and uses, for example, acrylic acid-modified polypropylene or acrylic acid-modified polyethylene as the base resin. Similarly to the first adhesive layer 6, the base resin of the second adhesive layer 7 may also be maleic acid-modified to form maleic acid-modified polypropylene or maleic acid-modified polyethylene.

In this way, the second adhesive layer 7 uses polypropylene or polyethylene as the base resin, so the base resin is made of the same material as the inner surface layer 101b of the laminate material 101.

The intermediate layer 8 is laminated between the first adhesive layer 6 and the second adhesive layer 7, and has a thickness of, for example, 50 μm. The intermediate layer 8 is made of a cross-linked base resin, and the base resin used is, for example, polypropylene or polyethylene.

The film portion 3 is adhered to the lead terminal 2 and the sealing portion 102 of the laminate material 101 by thermocompression bonding, but by making the base resin of the intermediate layer 8 of the film portion 3 cross-linked polypropylene or cross-linked polyethylene as described above, the heat resistance of the film portion 3 is improved and deformation or crushing of the film portion 3 is suppressed. Therefore, a stable adhesion state of the film portion 3 to the lead terminal 2 and the sealing portion 102 can be ensured, and high insulation between the lead terminal 2 and the laminate material 101 can be ensured.

In addition, by using polypropylene or polyethylene, which is a polyolefin-based resin that is difficult for moisture to permeate, as the base resin of the film portion 3, moisture is unlikely to permeate through the film portion 3, and the generation of hydrofluoric acid inside the package is suppressed. As a result, peeling due to corrosion is unlikely to occur between the film portion and the lead terminals, and permeation of the electrolyte solution 103, etc. is unlikely to occur, ensuring high functionality of the nonaqueous electrolyte device 100.

<Test results regarding adhesion>
The results of a test on adhesion, which measured the state of adhesion between the coating and the first adhesive layer, will be described below (see FIG. 4).

Adhesion tests were conducted on four types of materials, depending on whether or not they had a coating and whether or not the film portion was acid-modified. The coating was made of a material containing acrylic resin and zirconium salt, and the film portion was made of a material whose base resin was acrylic acid-modified polypropylene. Tests were also conducted on both the tab lead that functioned as the positive electrode and the tab lead that functioned as the negative electrode, using the above four types of materials. Aluminum was used as the terminal body for the positive electrode, and an alloy of nickel and copper was used as the terminal body for the negative electrode.

The test consisted of a "reference test" that served as a benchmark and an "actual test" that measured adhesion against the reference test.

The standard test was conducted on the four types of tab leads mentioned above by pulling the film portion and peeling it off from the lead terminal. The peel angle was 180 degrees, and the peel speed was 5 mm per minute.

On the other hand, in the actual measurement test, 1000 ppm of water was added to the electrolyte for lithium ion batteries as an accelerated test, and this was prepared as the immersion liquid for each tab lead. In the immersion liquid thus produced, hydrofluoric acid was generated by adding water to the electrolyte, making the coating easily peel off from the film portion.

The actual test was performed by immersing the four types of tab leads mentioned above in the immersion liquid for a certain period of time, and then pulling the film portion to peel it off from the lead terminal. The peeling angle and peeling speed were the same as in the standard test, the temperature of the immersion liquid was 85 degrees, and the immersion time of each tab lead in the immersion liquid was 336 hours.

Each test was performed using the method described above, and the ratio of the peel strength of the film part in the standard test to the peel strength in the actual test was calculated as the adhesion remaining rate.

The symbols "○", "△", and "×" in Figure 4 indicate the magnitude of the adhesion remaining rate, with "○" indicating that the adhesion remaining rate is 70% or more, "△" indicating that the adhesion remaining rate is 60% or more but less than 70%, and "×" indicating that the adhesion remaining rate is less than 60%.

As shown in Figure 4, when the coating containing acrylic resin and zirconium salt was not formed on the lead terminal, the adhesion remaining rate was low at less than 60%, regardless of whether the base resin of the film portion was acid-modified or not.

On the other hand, when a coating containing acrylic resin and zirconium salt was formed on the lead terminal, the adhesion remaining rate was 60% or more, and in particular, when the coating was formed on the lead terminal and the base resin of the film portion was modified with acrylic acid, the adhesion remaining rate was high, at 70% or more.

The above measurement results confirmed that when a coating containing acrylic resin and zirconium salt is formed on a lead terminal, high adhesion is achieved between the coating of the lead terminal and the first adhesive layer of the film portion. In addition, when a coating containing acrylic resin and zirconium salt is formed on a lead terminal and the base resin of the film portion is modified with acrylic acid, it was confirmed that even higher adhesion is ensured between the coating of the lead terminal and the first adhesive layer of the film portion.

<Summary>
As described above, in the tab lead 1 and the nonaqueous electrolyte device 100 including the same, the film portion 3 is provided with the first adhesion layer 6 having an acid-modified polyolefin as a base resin on the lead terminal 2 side, and the coating 5 is configured to contain the same components as the base resin of the first adhesion layer 6.

Therefore, the first adhesive layer 6, which is made of an acid-modified polyolefin base resin, is adhered to the coating 5 of the lead terminal 2, which contains the same components as the acid-modified portion of the base resin of the first adhesive layer 6, from both sides, so that the affinity between the first adhesive layer 6 of the film portion 3 and the coating 5 of the lead terminal 2 is high, and high adhesion is achieved between the lead terminal 2 and the film portion 3, ensuring long-term resistance to electrolyte and the like. As a result, no gap is generated between the lead terminal 2 and the film portion 3, preventing leakage of the electrolyte 103 and the like sealed inside the laminate material 101, ensuring sealing, and ensuring good performance of the nonaqueous electrolyte device 100.

In addition, the coating 5 is a surface treatment coating containing a water-soluble zirconium salt and a water-soluble or water-dispersible acrylic resin, and the water-soluble zirconium salt is adjusted to 0.8 to 300 mg per square meter on a mass basis as zirconium, and the water-soluble or water-dispersible acrylic resin is adjusted to have a solid content acid value of 150 to 740 mg KOH/g and a solid content hydroxyl value of 24 to 240 mg KOH/g, and is adjusted to have a solid content of 1.0 to 600 mg per square meter on a mass basis.

As a result, the corrosion resistance of the coating 5 is increased and the affinity of the coating 5 with the first adhesive layer 6 is also increased, which improves the rust prevention properties of the terminal body 4 by improving the corrosion resistance of the coating 5 and ensures high adhesion between the lead terminal 2 and the film portion 3.

Furthermore, by using acrylic acid-modified polypropylene or polyethylene as the base resin of the first adhesive layer 6, the first adhesive layer 6 contains the same acrylic component as the coating 5, so that the film portion 3 can be formed at low cost and high adhesion between the lead terminal 2 and the film portion 3 can be ensured.

Furthermore, a second adhesive layer 7 is provided on the film portion 3 on the side facing the laminate material 101, the second adhesive layer 7 being made of a base resin made of the same material as the laminate material 101.

As a result, the affinity between the second adhesive layer 7 and the laminate material 101 is increased, and high adhesion between the film portion 3 and the laminate material 101 can be ensured.

In addition, since the second adhesive layer 7 has polypropylene or polyethylene as its base resin, it is formed of a material that has a high affinity with the laminate material 101, and can ensure high adhesion between the film portion 3 and the laminate material 101 while ensuring high functionality of the nonaqueous electrolyte device 100. Furthermore, when the base resin of the second adhesive layer 7 is polypropylene, the second adhesive layer 7 is formed of a material that is difficult for moisture to permeate, and therefore even higher adhesion between the film portion 3 and the laminate material 101 can be ensured.

＜Other＞
Although the above describes an example in which the tab leads 1, 1 connected to the positive electrode 104 or the negative electrode 105 both protrude in the same direction (upward) from the laminate material 101, in the nonaqueous electrolyte device 100, the tab leads 1, 1 connected to the positive electrode 104 or the negative electrode 105 may protrude in opposite directions from the laminate material 101.

REFERENCE SIGNS LIST 100 Non-aqueous electrolyte device 101 Laminate material 103 Electrolyte solution 1 Tab lead 2 Lead terminal 3 Film portion 4 Terminal body 5 Coating 6 First adhesive layer 7 Second adhesive layer

Claims (5)

A tab lead used in a laminate-type nonaqueous electrolyte device in which at least an electrolytic solution or a solid electrolyte is sealed inside a laminate material,
a lead terminal having a terminal body made of a metal material and a coating covering a surface of the terminal body;
a pair of film portions that are in close contact with the lead terminals from both sides and are in close contact with the laminate material to seal the laminate material;
the film portion is provided with an adhesive layer on the lead terminal side, the adhesive layer having an acid-modified polyolefin as a base resin;
The coating contains the same component as the base resin of the adhesion layer,
the coating is a surface treatment coating containing a water-soluble zirconium salt and a water-soluble or water-dispersible acrylic resin,
The water-soluble zirconium salt is present in an amount of 0.8 to 300 mg per square meter based on mass of zirconium;
the water-soluble or water-dispersible acrylic resin is adjusted to have a solid content acid value of 150 to 740 mgKOH/g and a solid content hydroxyl value of 24 to 240 mgKOH/g and a solid content of 1.0 to 600 mg per square meter on a mass basis ;
The coating and the base resin of the adhesive layer are formed from a resin material having the same functional group.
Tab lead. The tab lead according to claim 1 , wherein the adhesive layer has a base resin of acrylic acid-modified polypropylene or polyethylene. The tab lead according to claim 1 or 2, wherein the film portion is provided on the side of the laminate material with a second adhesive layer, the second adhesive layer being made of a base resin made of the same material as the laminate material. The tab lead according to claim 3 , wherein the second adhesive layer has a base resin of polypropylene or polyethylene. A laminate-type nonaqueous electrolyte device in which at least an electrolytic solution or a solid electrolyte is sealed inside a laminate material and a tab lead is provided,
The tab lead is
a lead terminal having a terminal body made of a metal material and a coating covering a surface of the terminal body;
a pair of film portions that are in close contact with the lead terminals from both sides and are in close contact with the laminate material to seal the laminate material;
the film portion is provided with an adhesive layer on the lead terminal side, the adhesive layer having an acid-modified polyolefin as a base resin;
The coating contains the same component as the base resin of the adhesion layer,
the coating is a surface treatment coating containing a water-soluble zirconium salt and a water-soluble or water-dispersible acrylic resin,
the water-soluble or water-dispersible acrylic resin is adjusted to have a solid content acid value of 150 to 740 mgKOH/g and a solid content hydroxyl value of 24 to 240 mgKOH/g and a solid content of 1.0 to 600 mg per square meter on a mass basis ;
The coating and the base resin of the adhesive layer are formed from a resin material having the same functional group.
Non-aqueous electrolyte devices.

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