AU2020100433A4

AU2020100433A4 - Flexible Battery

Info

Publication number: AU2020100433A4
Application number: AU2020100433A
Authority: AU
Inventors: Szu-Nan Yang
Original assignee: Prologium Holding Inc; Prologium Technology Co Ltd
Current assignee: Prologium Holding Inc; Prologium Technology Co Ltd
Priority date: 2017-09-29
Filing date: 2020-03-20
Publication date: 2020-04-23
Anticipated expiration: 2026-08-16

Abstract

The present invention relates to a flexible battery. The electrochemical reaction struc ture is adhered to the inner surfaces of the package structure by a polymer including an amide group, an imine group, and a carbonyl group. As a result, the electrochemical reac 5 tion structure and the current collector of the package structure disclosed in the present in vention have a better adhesive force when compared with a conventional polymer system mainly including a linear polymer. And the current collector in the present invention is a part of the package structure, so that a chemical bonding between the electrochemical reac tion structure and the package structure is presented to replace a common physical bonding, 10 such as vacuum packing. Therefore, the structure would not be easy to be separated after bending to improve the structural stability and the safety of the battery.

Description

FLEXIBLE BATTERY

BACKGROUND OF THE INVENTION

Field of Invention

The present invention relates to a flexible battery, in particular to a flexible battery which the electrochemical reaction structure and the package structure would not be cracked or separated after bending.

Related Art

Recently, various electronic devices are developed. To make such electronic devices more comply with the trend of lightweight and thin, space distributions within the electronic devices become an important issue. The flexible battery displaced in a non-plane may be one solution of the issue. However, once the electrochemical reaction layer and the current collector are peeled off during bending, the structure of the battery would be cracked and the problem of safety is caused.

With respect to the characteristics of the battery, if a better adhesion is existed between the active material layer and the current collector, the distances of the electron and ion migration in the electrode can be effectively shortened. Meanwhile, the resistance in the electrode is reduced, and the electrochemical conversion efficiency is improved. More specifically, when the active material layer and the current collector are tightly bonded, the distances of the electron and ion migration are shortened. The resistances between each interfaces of the layers are reduced, and the coulombic efficiency is further improved. The battery capacity can still be maintained after being repeatedly charged and discharged. Moreover, the chosen binder in the active material layer would significantly affect the adhesion between the layers. And the content and distribution of the active materials in the active material layer could be directly determined. Along with the active material and the binder better connection relationship, the active materials in the active material layer have more desirable content and distribution, of course, can improve the capacity of the battery.

As aforementioned viewpoint, at present days, the flexible adhesives, such as Polyvi nylidene fluoride (PVDF), poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) or styrene-butadiene rubber (SBR) are usually used in the lithium battery. These adhesives belong to a linear structure, which can provide well adhesion in X or Y axis directions. However, after heating or pressing treatments, the polymer chain of these adhesives would occur crystallization reaction due to the affecting of heats or pressure. In other words, the interfaces between the active material layers and the current collectors which adding these adhesives, will generate a large amount of crystals after heating or pressing treatments to affect the ability of the adhesion. Besides, the ability of the adhesion for the active materials is reduced resulting from that the structure or the crystalline structure of the adhesive is damaged by the external force. The the electrodes are easily to to cracks after drying, even the active material layers and the current collectors would be separated. In the end, the electrical conductivities is decreased. In addition to cause the worse of the electrical efficiency for the battery, the safety of the battery is more seriously affected. On the other hand, if the adhesives with steric structure, such as epoxy, acrylic acid glue or polyacrylonitrile (PAN) are completely used, the adhesion is very well. But the rigidity is too high due to its steric structure and the flexible is not enough to meet the requirement of the bending for the battery.

In view of the above factors, the invention provides a flexible battery in order to overcome the aforementioned problems.

SUMMARY OF THE INVENTION

It is a primary objective of this invention to provide a flexible battery to provide higher molecular bonding force by a polymer including an amide group, an imine group, and a carbonyl group. The weaker molecular bonding between the electrochemical reaction structure and the current collector is improved. Therefore, it is avoided the electrochemical reaction structure and the current collector being cracked or separated after bending of the flexible battery. Also, the electrical conductivity of the flexible battery can be kept well after bending.

It is another primary objective of this invention to provide a flexible battery, which discloses that a certain amount of the first polymer must be contained at the interface of the electrochemical reaction structure between the contact surfaces of the electrochemical reaction structure and the package structure. And the polymer system contains 0.02 to 70 percent by weight of the first polymer.

It is another objective of this invention to provide a flexible battery. The current collector is parts of the package structure to adhere the whole package structure and the electrochemical reaction structure to a single structure. Therefore, a chemical bonding between the interfaces of the electrochemical reaction structure and the package structure is presented to replace a common physical bonding. The degree and the amounts of the bending can be improved for the formed flexible battery.

It is another objective of this invention to provide a flexible battery. The highly crystallization caused by the regular arrangement of the lattice after a heating or a hot pressing treatments for the linear polymer is reduced by adding a polymer including an amide group, an imine group, and a carbonyl group.

It is another objective of this invention to provide a flexible battery. The heat resistance of the overall flexible battery is improved by adding a polymer including an amide group, an imine group, and a carbonyl group. The heat treatment temperature, which is greater than 180°C, for the flexible battery can be withstood when carrying out a heating or a hot pressing treatments.

It is another objective of this invention to provide a flexible battery, which discloses that the polymer including an amide group, an imine group, and a carbonyl group is a non-linear polymer.

In order to implement the abovementioned, this invention discloses a flexible battery, including a package structure and an electrochemical reaction structure, which is adhered to the package structure directly. The electrochemical reaction structure and at least one of the two inner surfaces of the package structure are adhered directly by the first polymer. The first polymer includes an amide group, an imine group, and a carbonyl group, and the pol ymer system contains 0.02 to 70 percent by weight of the first polymer. Therefore, when compared with a conventional polymer system mainly including a linear polymer, the electrochemical reaction structure and the package structure disclosed in the present invention have a better adhesive force. These structures would not be easy to be separated after bending to improve the structural stability and the safety of the battery.

Wherein the inner surfaces collect current of the electrochemical reaction structure.

Wherein the package structure includes:

two current collecting substrates, disposed corresponding to each other; and a glue frame, disposed in an edge of at least one of the current collecting substrates in an orthographical direction, wherein the glue frame is adhered to both the current collecting substrates to be sandwiched between the two current collecting substrates which are adhered to each other, and wherein the glue frame and the two current collecting substrates form the enclosed space.

Wherein a top surface and a bottom surface of the enclosed space are the two inner surfaces, and the sidewalls of the enclosed space are the glue frame.

Wherein the electrochemical reaction structure is connected to the glue frame directly or indirectly.

Wherein the glue frame is a closed continuous structure or a discontinuous structure without a break.

Wherein the electrochemical reaction structure is formed on the inner surfaces of the package structure directly.

Wherein the electrochemical reaction structure is adhered to the package structure by a heating process on the electrochemical reaction structure and the inner surfaces of the package structure to cure the first polymer.

Wherein a heating temperature of the heating process is from 150°C to 250°C or from 180°C to 220°C.

Wherein the electrochemical reaction structure is adhered to the package structure by a pressing process on the electrochemical reaction structure and the inner surfaces of the package structure.

Wherein a pressure of the pressing process is from 40 kgf to 120 kgf or from 65 kgf to 110 kgf.

Wherein the polymer system further includes a linear polymer, which is selected from polyvinylidene fluoride (PVDF), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), polytetrafluoroethylene (PTFE), acrylic acid glue, epoxy, polyethylene oxide (PEO), polyacrylonitrile (PAN), sodium carboxymethyl cellulose, styrene-butadiene rubber (SBR), polymethylacrylate, polyacrylamide, polyvinylpyrrolidone (PVP) and combinations thereof.

Wherein the first polymer is a non-linear polymer.

Wherein the first polymer is selected from the group consisting of branched polymers and derivatives thereof, cross-linked polymers and derivatives thereof, network structure polymers and derivatives thereof, ladder structure polymers and derivatives thereof, and combinations thereof.

Wherein the first polymer is selected from epoxy, acrylic acid resin, polyacrylonitrile (PAN) and combinations thereof with network-structure.

Wherein the first polymer is a polyimide (PI) and derivatives thereof with ladder-structure.

Wherein the first polymer is a polyimide (PI) and derivatives, which includes thermoplastic polyimide, thermoset polyimide, and combinations thereof.

Wherein the electrochemical reaction system further includes a second polymer, and wherein the polymer system contains 0.02 to 70 percent by weight of the second polymer.

Wherein the second polymer is a non-linear polymer.

Wherein the second polymer is selected from the group consisting of branched polymers and derivatives thereof, cross-linked polymers and derivatives thereof, network struc ture polymers and derivatives thereof, ladder structure polymers and derivatives thereof, and combinations thereof.

Wherein the second polymer is selected from epoxy, acrylic acid resin, polyacrylonitrile (PAN) and combinations thereof with network-structure.

Wherein the second polymer is a polyimide (PI) and derivatives thereof with ladder-structure.

Wherein the second polymer is a polyimide (PI) and derivatives, which includes thermoplastic polyimide, thermoset polyimide, and combinations thereof.

Wherein the flexible battery is liquid batteries, gel batteries, solid state batteries, liq10 uid/gel hybrid batteries, liquid/solid state hybrid batteries or gel/solid state hybrid batteries.

Wherein the flexible battery is flexible lithium batteries, flexible lithium ion batteries, flexible lithium polymer batteries, flexible lithium metal batteries, flexible lithium ceramic batteries, or flexible lithium metal ceramic batteries.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of one embodiment of the flexible battery of this invention.

Reference numerals

	1	Flexible battery	2	Package structure
20	221	Current collecting substrate	222	Current collecting substrate
	24	Glue frame	4	Electrochemical reaction structure
	421	Active material layer	422	Active material layer
	44	Electrically insulating layer	S	Enclosed space
	S_up	Inner surface	Sdown	Inner surface

S_side Sidewalls

DETAILED DESCRIPTION OF THE INVENTION

Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter.

Please refer to FIG. 1, the flexible battery 1 includes an electrochemical reaction structure 4 and a package structure 2. The package structure 2 is a sealed structure, which may be a bag, a case or any containers. The package structure 2 includes two current collecting substrates 221, 222 and a glue frame 24. The current collecting substrates 221, 222 are disposed corresponding to each other. The glue frame 24 is disposed along with the edge of at least one of the current collecting substrates 221, 222 in an orthographical direction, and is adhered to the current collecting substrates 221, 222 directly or indirectly. Therefore, the glue frame 24 is sandwiched between the two current collecting substrates 221, 222 to make which the two current collecting substrates 221, 222 be adhered to each other. According to the above-mentioned structure, the space enclosed by the glue frame 24 and the two current collecting substrates 221, 222 is formed an enclosed space. Therefore, inside the package structure 2, there have two inner surfaces S_up, Sdown and the enclosed space S, wherein a top and a bottom of the enclosing space S are the above-mentioned two inner surfaces S_up, Sdown, and the sidewalls S_sid_e of the enclosing space S is parts of the glue frame 24, which may be, for example, the inner edge surface of the glue frame 24.

Wherein, the inner surfaces S_up, Sdown of the package structure 2 are part of the surfaces of the current collecting substrates 221, 222, which function to collect current of the electrochemical reaction structure 4. Due to the glue frame 24 has to be able to completely seal the sidewalls S_sid_e of the package structure 2, the glue frame 24 is a closed continuous structure or a discontinuous structure without a break.

The electrochemical reaction structure 4 has a polymer system including a first polymer therein. The first polymer is contained in the interfaces of the electrochemical reaction structure 4 and the package structure 2. For example, when the first polymer of the inter faces of the electrochemical reaction structure 4 and package structure 2 is provided by the active materials of the electrochemical reaction system, the first polymer is mixed within the active materials to form the active material layers 421, 422, such as the positive active material layer and the negative active material layer. Moreover, when the flexible battery 1 has an independent electrically insulating layer 44 therein, the first polymer may also be mixed therein to serve as one of the adhesives. The electrically insulating layer 44 may be such as, but not limited to, a ceramic separator, a polymeric separator, a non-woven separator, or combinations thereof.

In a specific chemical system structure of batteries, such as a chemical system of a liquid electrolyte, it is suggested that the material of the glue frame has opposite or repulsive polarity to the electrolyte, such as a silicone system, an acrylic resin or an epoxy system, or the likes. Thereby, the problem of poor adhesion capability for the glue frame is avoided, caused by the contamination of the electrolyte, by the material characteristics of the glue frame to repulsive the electrolyte during the electrolyte injection.

Then, in a variety of different battery systems, the present invention can also be defined and applied in a liquid battery system, a gel battery system, and a solid state battery system. For example, in a liquid battery system and a gel battery system, the first polymer is mainly applied in an electrically insulating layer to be served as an adhesive. In a gel battery system and a solid state battery system, the first polymer in the polymer system can be applied in the electrically insulating layer (particularly to a gel battery system and a solid state battery system specifically using an separator), and more important is that it can be applied in the electrolyte of the gel battery system and the solid state battery system. By adding the first polymer to increase the speed at which the ions move in the electrolyte, the ionic conductivity of the gel electrolyte and the solid electrolyte is improved.

Naturally, it may take all the structures described above for example. According to the characteristics and efficiency of different active materials, ceramic materials or polymer materials, excepting for the first polymer, each of the elements in the electrochemical reaction structure can have the first polymer and the other polymers in the same proportion or different proportions to achieve the best effect in various battery systems. But most im portantly, as the structure shown in FIG. 1, on the contact surface, such as the inner surfaces S_Up, Sdown, to the package structure 2, a certain amount of the first polymer must be contained at the interface of the electrochemical reaction structure 4.

The first polymer of this invention includes an amide group, an imine group, and a carbonyl group, and the polymer system contains 0.02 to 70 percent by weight of the first polymer. When compared with the linear polymers, the first polymer do not belong to a linear polymer. In structure, the first polymer is more similar to branched polymers, cross-linked polymers, network structure polymers, ladder structure polymers and their derivatives. For the polymer system, which are mixed with the linear polymer and the first polymer, the molecular bonding between the electrochemical reaction structure and the package structure will be improved by the amide group, the imine group, and the carbonyl group of the first polymer. More specifically, excepting for the linear polymer, such as, but not limited to, polyvinylidene fluoride (PVDF), the polymer system of the electrochemical reaction layers may also include the first polymer with the amide group, the imine group, and the carbonyl group, such as, but not limited to, ladder structure polymers, as exemplified herein by polyimide (PI). Therefore, referring again to FIG. 1, the electrochemical reaction structure 4 and the two current collecting substrates 221, 222 of the package structure 2 are to be adhered. The current collecting substrates 221, 222 is a metal substrate, and the metal may be, for example but not limited to, copper, aluminum, nickel, stainless steel, etc. In the interfaces to be adhered, the inner surfaces S_up, Sdown, between the electrochemical reaction structure 4 and the current collecting substrates 221, 222, e.g. copper foil, aluminum foil, there have a nitrogen atom of the ladder structure polymers, amide group bond, the imine group bond, and the carbonyl group bond resulting from the presence of the first polymer, excepting for the molecular bond between the fluorine atom of the linear polymer, e.g. PVDF, and the current collecting substrates 221, 222. Therefore, a significant effect on the adhesion between the electrochemical reaction structure 4 and the current collecting substrates 221, 222 in the package structure 2 is achieved. Moreover, the above-mentioned polyimide (PI) and derivatives may include thermoplastic polyimide, thermoset polyimide, and combinations thereof.

Although above described in terms of specific materials, in practice, the linear polymer is made of a liner polymer with certain flexibility. The linear polymer is selected from polyvinylidene fluoride (PVDF), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), polytetrafluoroethylene (PTFE), acrylic acid glue, epoxy, polyethylene oxide (PEO), polyacrylonitrile (PAN), sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), polymethylacrylate, polyacrylamide, polyvinylpyrrolidone (PVP) and combinations thereof.

Also, while the first polymer is exemplified by a ladder structure polymer, when the first polymer is a branched polymer, a cross-linked polymer, a network structure polymer, the polymer material is selected from epoxy, acrylic acid resin, polyacrylonitrile (PAN) and combinations thereof.

Further, in addition to the above, the bonding force between the electrochemical reaction structure 4 and the package structure 2 is improved by the first polymer which mainly compose of the branched polymer, the cross-linked polymer, the network structure polymer or the ladder structure polymer. It is also important that the electrochemical reaction structure 4 is directly adhered to the package structure 2 of the flexible battery 1 according to the present invention. In other words, the connection relationship between the electrochemical reaction structure 4 and the package structure 2 is a chemical bond, and the current collecting substrates 221, 222 are parts of the package structure 2 compared to a conventional existing battery (not shown). The electrochemical reaction structure of the conventional existing battery is also adhered to the package structure, but the packaging materials do not integrate with the current collecting substrates as a single structure. Therefore, the connection relationship between the electrochemical reaction structure and the packaging materials is built through a vacuum process to make the overall flexible battery structure fixed. However, it is obviously that the flexible battery structure is fixed by a vacuum process in the conventional flexible battery structure. If the package condition is poor, the bending angle is too large or the bending amount is too much, the vacuum state of the packaging materials is easily damaged. The electrical performance and safety requirements of the battery are affected. Meanwhile, the obvious wrinkles and breakage are occurred in the ap pearance of the battery. However, in this invention, the electrochemical reaction structure 4 is directly adhered to the current collecting substrates 221, 222 of the packaging structure 2, and a chemical bonding is presented to replace a conventional physical bonding. The electrochemical reaction structure 4 and the package structure 2 has a significant better adhesive resulting from the polymer system mixing with the linear polymer, the branched polymer, the cross-linked polymer, the network structure polymer or the ladder structure polymer material when compared with a conventional polymer system mainly including a linear polymer.

The adhesion between the electrochemical reaction structure and the package structure of the present invention, may be performed by heating, pressing or both processes to adhere the electrochemical reaction structure to the package structure, excepting for directly forming the electrochemical reaction structure on the package structure. Regardless of the bonding mode, if a chemical bond would be generated between the polymer system in the electrochemical reaction structure and the inner surfaces of the packaging structure, the electrochemical reaction structure and the packaging structure have to be performed heating, pressing or both processes to enable the polymer material of the polymer system to be cured. The conventional polymer system is mainly made of a linear polymer and the curing temperature is relatively lower, typically at 120-150°C. Compared with an conventional polymer system, the heating temperature of the heating process may be increased to 150°C, due to the non-linear polymer is included in the polymer system of this invention, and preferably the heating temperature is 180-220°C. Moreover, excepting for the heating process to cure the polymer, the pressing process may also be used. A pressure of the pressing process is from 40 kgf to 120 kgf, and preferably is from 65 kgf to 110 kgf. Certainly, based on material property, the above-mentioned heating process and pressing process can be integrated in a single hot pressing process. The ranges of the temperature and the pressure are still the same as those described above.

Further, the electrochemical reaction structure includes a second polymer, and the polymer system of the electrochemical reaction structure contains 0.02 to 70 percent by weight of the second polymer. Similar to the first polymer, the second polymer is a non-linear polymer, and is mainly composed of branched polymers, cross-linked polymers, network structure polymers, ladder structure polymers, their derivatives, or combinations thereof. For example, the material of the second polymer is selected from epoxy, acrylic acid resin, polyacrylonitrile (PAN) and combinations thereof, or selected from a polyimide (PI) and derivatives thereof with ladder-structure, and the polyimide (PI) and derivatives includes thermoplastic polyimide, thermoset polyimide, and combinations thereof.

When the polymer system of the electrochemical reaction structure contains both the first polymer and the second polymer, according to the different electrochemical systems, e.g. active material types, separating systems, etc., the first polymer and the second polymer in the polymer system can be the same polymer material due to both of first polymer and the second polymer are non-linear polymers. But the weight percentage of the first polymer and the second polymer is not necessary to be the same. Certainly, the first polymer and the second polymer can also be different polymer materials, and the weight percentage of the first polymer and the second polymer is not limited. Also, the conditions of the heating and pressing process performed to the second polymer are the same as the condition of the first polymer described above.

Finally, all of the structures disclosed herein, all materials and all processes, are applicable to a variety of battery systems such as, for example, liquid batteries, colloidal batteries, solid state batteries, liquid/colloidal hybrid batteries, liquid/solid state hybrid batteries or colloidal/solid state hybrid batteries, or so-called flexible lithium batteries, flexible lithium ion batteries, flexible lithium polymer batteries, flexible lithium metal batteries, flexible lithium ceramic batteries, or flexible lithium cermet batteries.

The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.

Claims

1. A flexible battery, comprising:

an electrochemical reaction structure, having a polymer system including a linear polymer and a first polymer therein; and a package structure, being sealed and having two inner surfaces and an enclosed space therein, wherein the electrochemical reaction structure is adhered to the inner surfaces directly and disposed in the enclosed space;

characterized in that:

the electrochemical reaction structure and at least one of the two inner surfaces of the package structure are adhered directly by the first polymer, wherein the first polymer is a non-linear polymer, the first polymer is selected from the group consisting of branched polymers and derivatives thereof, cross-linked polymers and derivatives thereof, network structure polymers and derivatives thereof, ladder structure polymers and derivatives thereof, and combinations thereof, and the first polymer includes an amide group, an imine group, and a carbonyl group, and wherein the polymer system contains 0.02 to 70 percent by weight of the first polymer.

2. The flexible battery of claim 1, wherein the inner surfaces collect current of the electrochemical reaction structure.

3. The flexible battery of claim 1, wherein the package structure includes:

4. The flexible battery of claim 3, wherein a top surface and a bottom surface of the enclosed space are the two inner surfaces, and the sidewalls of the enclosed space are the glue frame.

5. The flexible battery of claim 3, wherein the electrochemical reaction structure is connected to the glue frame directly or indirectly.

6. The flexible battery of claim 3, wherein the glue frame is a closed continuous structure or a discontinuous structure without a break.

7. The flexible battery of claim 1, wherein the electrochemical reaction structure is formed on the inner surfaces of the package structure directly.

8. The flexible battery of claim 1, wherein the electrochemical reaction structure is adhered to the package structure by a heating process on the electrochemical reaction structure and the inner surfaces of the package structure to cure the first polymer.

9. The flexible battery of claim 8, wherein a heating temperature of the heating process is from 150°C to 250°C or from 180°C to 220°C.

10. The flexible battery of claim 1, wherein the electrochemical reaction structure is adhered to the package structure by a pressing process on the electrochemical reaction structure and the inner surfaces of the package structure.

11. The flexible battery of claim 10, wherein a pressure of the pressing process is from 40 kgf to 120 kgf or from 65 kgf to 110 kgf.

12. The flexible battery of claim 1, wherein the polymer system further includes a linear polymer, the linear polymer is selected from polyvinylidene fluoride (PVDF), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), polytetrafluoroethylene (PTFE), acrylic acid glue, epoxy, polyethylene oxide (PEO), polyacrylonitrile (PAN), sodium carboxymethyl cellulose, styrene-butadiene rubber (SBR), polymethylacrylate, polyacrylamide, polyvinylpyrrolidone (PVP) and combinations thereof.

13. The flexible battery of claim 1, wherein the first polymer is selected from epoxy, acrylic acid resin, polyacrylonitrile (PAN), and combinations thereof with network-structure.

14. The flexible battery of claim 1, wherein the first polymer is a polyimide (PI) and derivatives thereof with ladder-structure.

15. The flexible battery of claim 1, wherein the first polymer is a polyimide (PI) and derivatives, which includes thermoplastic polyimide, thermoset polyimide, and combinations thereof.

16. The flexible battery of claim 1, wherein the electrochemical reaction system further includes a second polymer, and wherein the polymer system contains 0.02 to 70 percent by weight of the second polymer.

17. The flexible battery of claim 16, wherein the second polymer is a non-linear polymer.

18. The flexible battery of claim 16, wherein the second polymer is selected from the group consisting of branched polymers and derivatives thereof, cross-linked polymers and derivatives thereof, network structure polymers and derivatives thereof, ladder structure polymers and derivatives thereof, and combinations thereof.

19. The flexible battery of claim 18, wherein the second polymer is selected from epoxy, acrylic acid resin, polyacrylonitrile (PAN) and combinations thereof with network-structure.

20. The flexible battery of claim 18, wherein the second polymer is a polyimide (PI) and derivatives thereof with ladder-structure.

21. The flexible battery of claim 20, wherein the second polymer is a polyimide (PI) and derivatives, which includes thermoplastic polyimide, thermoset polyimide, and combinations thereof.

22. The flexible battery of claim 1, wherein the flexible battery is liquid batteries, gel batteries, solid state batteries, liquid/gel hybrid batteries, liquid/solid state hybrid batteries or gel/solid state hybrid batteries.

2020100433 20 Mar 2020

23. The flexible battery of claim 1, wherein the flexible battery is flexible lithium batteries, flexible lithium ion batteries, flexible lithium polymer batteries, flexible lithium metal batteries, flexible lithium ceramic batteries, or flexible lithium metal ceramic batteries.