CN110237995B - Equipment and method for preparing electrode - Google Patents

Abstract

The invention discloses an apparatus and a method for preparing an electrode. The apparatus for preparing an electrode includes: a roll-to-roll device for stretching the stretchable substrate; and the coating device is used for coating the conductive ink on the stretched substrate to form an electrode layer. According to the equipment for preparing the electrode, which is provided by the embodiment of the invention, the stretchable substrate is stretched by adopting the roll-to-roll device, so that the roll-to-roll process is applied to the production equipment of the stretchable electrode, and the online production of the stretchable electrode is realized; the manufacturing cost of the stretchable electrode is reduced by utilizing the characteristics of simplicity, convenience and high efficiency of a roll-to-roll process, and the mass production of the stretchable electrode is realized.

Description

Equipment and method for preparing electrode

Technical Field

The invention relates to the technical field of stretchable electrode preparation, in particular to equipment and a method for preparing an electrode.

Background

With the gradual promotion of unmanned vehicles, wearable equipment, internet of things, man-machine interaction and interconnection type electronics, electrical devices which are easy to wear and have biocompatibility gradually enter the visual field of people. This would require a large number of more adaptable electronic devices, and the importance of stretchable devices in order to be adaptable to a variety of environments and surfaces is becoming increasingly prominent. Stretchable electrodes are required in order to achieve stretchability of the device.

According to the work that researchers at home and abroad have in the field of stretchable electronics, the following information can be derived: at the laboratory level, considerable progress has been made in recent years in the research on stretchable electronics, including the development of various stretchable strategies, such as stretchable materials, geometric designs, process developments, etc., and enabling the experimental structure to be matched to the simulation results, putting the concept of stretchable electronics into reality. However, at present, the major research on stretchable electronics is focused on the laboratory, and is limited by the complexity of the manufacturing process (requiring multiple steps of photolithography, transfer, bonding, alignment, packaging, etc.), the stability of heavy stretching, and the poor conductivity. Therefore, currently, the research for mass production of stretchable electrodes is relatively rare, and it is difficult to realize mass production of stretchable electrodes.

Disclosure of Invention

It is an object of embodiments of the present invention to provide an apparatus and method for preparing an electrode to enable mass production of stretchable electrodes.

In order to solve the above technical problem, an embodiment of the present invention provides an apparatus for preparing an electrode, including:

a roll-to-roll device for stretching the stretchable substrate;

and the coating device is used for coating the conductive ink on the stretched substrate to form an electrode layer.

Optionally, the roll-to-roll device includes an unwinding device, a winding device, and a stretch adjusting device disposed between the unwinding device and the winding device, the stretchable substrate unwound by the unwinding device is wound on the winding device after passing through the stretch adjusting device, and the stretch adjusting device is configured to stretch the substrate wound on the stretch adjusting device.

Optionally, tensile adjusting device includes first roller, second roller and third roller, the coiling is in after first roller, second roller and the third roller are convoluteed in proper order to the basement that unwinding device discharged on the coiling mechanism, first roller or/and the rotational speed of third roller is adjustable, adjusts first roller or/and the rotational speed of third roller makes the rotational speed of third roller is greater than the rotational speed of first roller to be located first roller with basement between the third roller is stretched.

Optionally, the stretching adjusting device comprises a first roller shaft, a second roller shaft and a third roller shaft, the substrate discharged by the unwinding device is sequentially wound on the winding device after passing through the first roller shaft, the second roller shaft and the third roller shaft, the position of the second roller shaft is adjustable, and the second roller shaft is adjusted to be away from the first roller shaft and the third roller shaft, so that the substrate between the first roller shaft and the third roller shaft is stretched.

Optionally, the apparatus further comprises a drying device, and the drying device is used for drying the formed electrode layer.

Optionally, the structure of the electrode layer is a mesh structure.

In order to solve the above technical problem, an embodiment of the present invention further provides a method for preparing an electrode, including:

stretching the stretchable substrate using a roll-to-roll apparatus;

and coating conductive ink on the stretched substrate by using a coating device to form an electrode layer.

Optionally, before the stretching the stretchable substrate using a roll-to-roll apparatus, the method further comprises:

and carrying out plasma surface treatment on the substrate, or carrying out coupling agent treatment on the substrate.

Optionally, the method further comprises:

and drying the formed electrode layer.

Optionally, the drying temperature is 60-80 ℃.

According to the equipment for preparing the electrode, which is provided by the embodiment of the invention, the stretchable substrate is stretched by adopting the roll-to-roll device, so that the roll-to-roll process is applied to the production equipment of the stretchable electrode, and the online production of the stretchable electrode is realized; the manufacturing cost of the stretchable electrode is reduced by utilizing the characteristics of simplicity, convenience and high efficiency of a roll-to-roll process, and the mass production of the stretchable electrode is realized.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic view of an apparatus for preparing an electrode according to a first embodiment of the present invention;

FIG. 2 is a schematic view of an apparatus for preparing an electrode according to a second embodiment of the present invention;

fig. 3 is a schematic view of a method of preparing an electrode according to a third embodiment of the present invention.

Description of reference numerals:

100, an unwinding device; 101-a first roller shaft; 102-a second roller shaft;

103-a coating device; 104-a drying device; 105-a third roller;

106-a winding device.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

In the related art, from the viewpoint of stretchable materials and structures, obtaining stretchability of an electrode can be achieved by three strategies:

(1) substrate level

The core problem that this approach deals with is breaking down the stretchability of the electrode into localized bends. An ultra-thin film is attached to a pre-stretched substrate, and if the tensile strengths of the film and the substrate meet matching conditions, after releasing the substrate, a wrinkled surface structure is obtained, which stress release structure contributes to the mechanical stability of the device due to its low elastic modulus.

With this method, it is considered that the electrode is formed on an ultra-thin polymer film and then transferred onto an elastic substrate having adhesiveness. The thinner the thickness of the polymer film, the more beneficial it is to convert tensile forces into bending deformations under stress conditions. However, during the formation of the wrinkles, shear forces are generated that separate the film and the substrate from each other, and therefore, it is necessary to ensure that the thickness of the polymer film is sufficiently thin and that the adhesion of the electrode to the elastic substrate is sufficiently strong. The electrode formed according to the guiding concept, for example, the conductive material is coated on the pre-stretched Polydimethylsiloxane (PDMS) elastic substrate, and the stress is released, so that the electrode forms a wavy fold structure, and the stress directly acting on the electrode is reduced.

Another typical structure of such a substrate pre-stretching strategy is a composite of an electrically conductive material and an elastic substrate. The AgNWs/PDMS composite conductive film is prepared by a method of co-molding AgNWs (nano silver wires) pre-deposited on a silicon wafer and uncured PDMS. Because AgNWs and PDMS flexible substrate layers have different moduli, the high-elasticity substrate layer is subjected to opposite acting force for recovering deformation when being stretched and released, and the high-modulus conductive layer has small deformation capacity and can only release residual stress in a fold mode. The presence of the corrugations enables the conductor to withstand greater deformation, and when the conductor is stretched again, the tension will flatten the corrugations without tearing the surface. The stretchable conductive film obtained by this method shows almost no change in resistance after 40 times of stretching.

(2) Pixel level:

the design core of the "island-bridge" (rigid-island) structure is the concentration of stress onto the stretchable cells. The starting point for this design is the separation into a stretchable part and a non-stretchable part, giving stretchability to the stretchable wire. The stretchable wire can be an arc-shaped or serpentine bent metal strip, and the stretching deformation of the conductive film integrally caused by external stress is adapted through the bending or twisting deformation of the wire. Meanwhile, the stretchable wire can also be an elastic conductor, and when the whole conductive film is stretched, the elastic conductor directly bears the action of external tensile force to generate stretching deformation. The research focuses mainly on how to perform geometric definition and design on the wire (such as the wavelength, the waveform angle, the thickness and the like of a snake-shaped routing wire) so as to increase the tensile property, and the wire can be strictly defined mathematically and simulated by a finite element method so as to guide the experimental design; the conductive lines may be coplanar or non-coplanar; various patterns can be directly deposited on the pre-stretched elastic substrate through a photoetching mode, and the conductive units can also be transferred to the pre-stretched elastic substrate through a transferring mode to form a non-coplanar wiring mode.

(3) Material layer surface:

this is a solution closest to the stretchable electronic concept, and requires that the substrate, the conductive wires and the functional material continue to maintain their respective functionalities when they are subjected to stretching deformation, and when they are subjected to stretching deformation simultaneously, the conductive film remains intact and works normally, i.e. it is so-called intrinsically stretchable. For example, a fully stretchable light-emitting device, in which AgNW-PUA was selected as a stretchable conductive electrode and a high-efficiency light-emitting material was used as a light-emitting layer, the ultimate stretchable polymer light-emitting device exhibited a maximum tensile strength of 120%, a maximum luminance of 2200cd/m2, and a maximum current efficiency of 11.4cd/a, demonstrating the feasibility of a stretchable light-emitting device.

All the three strategies aim at the offline, are not the scheme for producing the stretchable electrode on the line, and cannot realize the mass production of the stretchable electrode.

In order to realize mass production of the stretchable electrode, the embodiment of the invention provides an apparatus for preparing an electrode, which comprises: a roll-to-roll device for stretching the stretchable substrate; and the coating device is used for coating the conductive ink on the stretched substrate to form an electrode layer.

According to the equipment for preparing the electrode, which is provided by the embodiment of the invention, the stretchable substrate is stretched by adopting the roll-to-roll device, so that the roll-to-roll process is applied to the production equipment of the stretchable electrode, and the online production of the stretchable electrode is realized; the manufacturing cost of the stretchable electrode is reduced by utilizing the characteristics of simplicity, convenience and high efficiency of a roll-to-roll process, and the mass production of the stretchable electrode is realized.

The technical contents of the present invention will be described in detail by specific embodiments.

The first embodiment:

fig. 1 is a schematic view of an apparatus for preparing an electrode according to a first embodiment of the present invention. The apparatus for preparing the electrode includes a roll-to-roll device and a coating device 103. Roll-to-roll apparatus is used to stretch the stretchable substrate. The coating device is used for coating conductive ink on the stretched substrate to form an electrode layer. Thus, a composite electrode having an electrode layer on a substrate is prepared, and since the electrode layer is formed on the substrate in a stretched state of the substrate, the prepared composite electrode is a stretchable electrode including a stretchable substrate and an electrode layer formed on the substrate. In one embodiment, the conductive ink may be a nano-silver solution and the substrate may be a Polydimethylsiloxane (PDMS) elastomeric substrate.

According to the equipment for preparing the electrode, which is provided by the embodiment of the invention, the stretchable substrate is stretched by adopting the roll-to-roll device, so that the roll-to-roll process is applied to the production equipment of the stretchable electrode, and the online production of the stretchable electrode is realized; the manufacturing cost of the stretchable electrode is reduced by utilizing the characteristics of simplicity, convenience and high efficiency of a roll-to-roll process, and the mass production of the stretchable electrode is realized.

As shown in fig. 1, the roll-to-roll apparatus includes an unwinding device 100, a winding device 106, and a stretch adjusting device 20 disposed between the unwinding device 100 and the winding device 106. The stretchable substrate 10 paid out by the unwinding device 100 is wound on the winding device 106 after passing through the stretch adjusting device 20. The stretch adjusting means 20 may stretch the substrate wound on the stretch adjusting means 20.

As shown in fig. 1, a coating device 103 is disposed above the stretching adjustment device 20, so that the coating device can coat conductive ink on the stretched substrate to form an electrode layer.

In one embodiment, the stretch adjusting means 20 may comprise a first roller 101, a second roller 102, and a third roller 105. The stretchable substrate 10 is wound around the unwinding device 100, and the stretchable substrate 10 unwound from the unwinding device 100 is sequentially wound around a first roller 101, a second roller 102, and a third roller 105, and then wound around a winding device 106. Typically, the winding device 106 is used to provide tension for advancing the web, i.e., the stretchable substrate 10, and the unwinding device 100 and the winding device 106 cooperate to control the speed of advancing the substrate 10.

As shown in fig. 1, a coating device 103 is disposed above the second roll 102 for coating the conductive ink on the surface of the stretched substrate 10 wound around the second roll 102. It is easily understood that the coating device 103 may employ one of blade coating, slit coating, and extrusion coating.

In the initial state, the substrate 10 between the unwinding device 100 and the winding device 106 is in a natural state. To prepare a stretchable electrode, the coating device 103 coats the conductive ink on the stretched substrate 10. The conductive ink applied by the coating device may be a nano silver solution. In order to obtain a stretchable electrode, it is necessary that the substrate 10 is in a coating stretched state when the coating device 103 applies the conductive ink to the substrate. In the present embodiment, the first roller 101, the second roller 102, and the third roller 105 cooperate to stretch the substrate wound around the second roller 102 to a coating stretched state in which the tension of the substrate wound around the second roller 102 is maintained at the coating tension. The coating tension is the tension that the substrate has when it is in a coating stretched state. The magnitude of the coating tension may be determined according to the nature of the stretchable substrate.

It is easily understood that in the roll-to-roll apparatus, the tension of the substrate between the unwinding apparatus 100 and the first roller 101 (i.e., unwinding tension), the tension of the substrate between the first roller 101 and the third roller 105 (i.e., coating tension), and the tension of the substrate between the third roller 105 and the winding apparatus 106 (i.e., winding tension) are generally different. Therefore, the substrate can be stretched by adopting the roll-to-roll device at different tension in multiple sections, the stretching tension of the substrate can be different in the steps of unwinding, coating and winding, the substrate is stable by controlling the normal tension in the unwinding and winding steps or other steps, and the substrate is in a coating stretching state by increasing the stretching of the substrate in the coating step, so that the electrode layer can be wrinkled on the substrate after the substrate recovers a natural state, the electrode layer is ensured to have certain conductivity after being stretched, and the performance of the stretchable electrode is ensured.

In order to prevent the slip phenomenon from occurring during the stretching process, it is necessary to increase the static friction force of the first roller 101 and the third roller 105 with respect to the substrate. In one embodiment, the surfaces of the first roller 101 and the third roller 105 are coated with a high friction material, or the surfaces of the first roller 101 and the third roller 105 are made to be in a high friction structure, so that the static friction between the first roller 101 and the substrate can be increased, the static friction between the third roller 105 and the substrate can be increased, the first roller 101 and the third roller 105 are prevented from slipping with the substrate, and the first roller 101 and the third roller 105 are relatively stationary with the substrate 10. Similarly, in order to prevent the second roller 102 from slipping with the substrate 10, the surface of the second roller 102 may be coated with a high friction material, or the surface of the second roller 102 may be formed into a high friction structure, so as to increase the static friction between the second roller 102 and the substrate.

In the present embodiment, the rotation speed of the first roller shaft 101 is ω 1, and the rotation speed of the third roller shaft 105 is ω 2. To stretch the substrate between the primary roller 101 and the tertiary roller 105, the rotational speed of the primary roller or/and the tertiary roller may be adjusted in one embodiment.

In one embodiment, the process of stretching the substrate between the first roller 101 and the third roller 105 may include:

s111: the rotation speed of the first roller shaft 101 or/and the third roller shaft 105 is adjusted so that ω 2> ω 1, and at this time, the rotation speed of the third roller shaft 105 is greater than the rotation speed of the first roller shaft 101, the substrate 10 wound on the second roller shaft 102 is stretched, and the tension of the substrate wound on the second roller shaft 102 is increased. It will be readily appreciated that the rotational speed of the third roller 105 may be increased such that ω 2> ω 1, or the rotational speed of the first roller 101 may be decreased such that ω 2> ω 1, or the rotational speeds of the first roller 101 and the third roller 105 may be adjusted simultaneously such that ω 2> ω 1.

S112: when the tension of the substrate wound on the second roll 102 is increased to the coating tension, the rotation speed of the first roll 101 and/or the third roll 105 is slowly adjusted so that ω 2 ═ ω 1, so that the tension of the substrate wound on the second roll 102 is maintained at the coating tension. It is easily understood that the rotation speed of the third roller shaft 105 may be reduced so that ω 2 becomes ω 1, or the rotation speed of the first roller shaft 101 may be increased so that ω 2 becomes ω 1, or the rotation speeds of the first roller shaft 101 and the third roller shaft 105 may be adjusted at the same time so that ω 2 becomes ω 1.

While the tension of the substrate wound around the second roll 102 is maintained at the coating tension, the substrate positioned between the first roll 101 and the third roll 105 is in a stable coating stretched state, and the coating device 103 performs coating to coat the conductive ink on the substrate wound around the second roll 102.

The speed of the coating device for coating the electrode layer may be determined by factors such as a target coating width and thickness of the substrate, a transfer speed of the substrate, and an ink discharge amount of the coating device, and in one embodiment, the speed of the coating device for coating the electrode layer is 0.2m/min to 2 m/min.

After the coating is stopped, the rotation speeds of the first roller 101 and the third roller 105 may be adjusted such that ω 2< ω 1, and at this time, the rotation speed of the third roller 103 is less than the rotation speed of the first roller 101, and the substrate contracts, so that the tension of the substrate wound on the second roller 102 is reduced to return to a natural stretching state.

In order to increase the firmness of the electrode layer on the substrate, the apparatus may further comprise a drying device 104, as shown in fig. 1, in order to prevent the electrode layer from adhering to the third roller 105 when the substrate passes through the third roller 105. The drying device 104 is disposed above the second roller 102, and is located before the third roller 105 after the coating device 103 is processed. The coating device 103 serves to dry the electrode layer on the substrate 10 wound on the second roll shaft 102. After drying device 104 dries the counter electrode layer, can increase the adhesion of electrode layer on the basement, prevent that the electrode layer from droing at the basement recovery in-process, simultaneously, drying device 104 dries the back to the electrode layer, can also prevent that the electrode layer from passing through third roller 105 in-process adhesion on third roller 105, has avoided the damage of electrode layer, has guaranteed composite electrode's performance.

In one embodiment, the drying temperature of the drying device is 60-80 ℃. In particular implementations, the drying temperature may be determined according to the concentration of the conductive ink, the thickness of the substrate, and the coating tension.

In one embodiment, the electrode layer formed on the substrate is in a net structure, the electrode layer in the structure can be better deformed and folded to release stress when the substrate returns to a normal state, meanwhile, the electrode layer in the structure is tightly adhered to the substrate and has small resistance change, and can be stretched along with the stretching of the substrate in the stretching process of the composite electrode, so that the electrical performance of the electrode layer is not influenced, and the stretching performance of the composite electrode is ensured.

In one embodiment, the apparatus for preparing an electrode may further include a tension detecting device for detecting the tension of the substrate wound on the second reel 102. When the tension detecting means detects that the tension of the substrate wound on the second roller shaft 102 reaches the coating tension, the stretch adjusting means 20 stops the continued stretching of the substrate so that the tension of the substrate wound on the second roller shaft 102 is maintained at the coating tension.

Second embodiment:

fig. 2 is a schematic view of an apparatus for preparing an electrode according to a second embodiment of the present invention. Unlike the first embodiment, the position of the first roller shaft 101 and/or the third roller shaft 105 is adjustable. For example, the position of the first roller 101 may be adjusted, and the winding path length of the substrate 10 from the unwinding device 100 to the second roller 102 may be increased by adjusting the position of the first roller 101, and thus, the tension of the substrate wound on the second roller 102 may be increased. Likewise, the position of the third roller 105 may be adjusted, and the winding path length of the substrate 10 from the second roller 102 to the windup 106 may be increased by adjusting the third roller 105, and thus, the tension of the substrate wound on the second roller 102 may be increased.

In one embodiment, the position of the first roller 101 is adjustable, and thus, stretching the substrate between the first roller 101 and the third roller 105 may include:

the position of the first roller shaft 101 is adjusted such that the winding path length between the unwinding device 100 and the second roller shaft 102 is increased. In fig. 2, a position a is an initial position of the first roller 101, and a 'is a position of the first roller 101 during adjustment, when the first roller 101 is adjusted from the position a to the position a', a winding path length between the unwinding device 100 and the second roller 102 is increased, so that the substrate wound between the unwinding device 100 and the second roller 102 is stretched, and thus, a tension of the substrate between the first roller 101 and the second roller 102 is increased, and a tension of the substrate 10 wound on the second roller 102 is increased. When the tension of the substrate wound around the second roller 102 increases to the coating tension, the adjustment of the position of the first roller 101 is stopped so that the first roller 101 is maintained at the current position, so that the tension of the substrate wound around the second roller 102 is maintained at the coating tension, and the substrate located between the first roller 101 and the third roller 105 is in a stable coating tension state.

In another embodiment, the position of the third roller 105 is adjustable, and thus, stretching the substrate between the first roller 101 and the third roller 105 may include:

the position of the third roller 105 is adjusted so that the winding path length between the second roller 102 and the windup 106 is increased. As shown in fig. 2, the B position is an initial position of the third roller 105, and B 'is a position of the third roller 105 during the adjustment, when the third roller 105 is adjusted from the B position to the B' position, the winding path length between the second roller 102 and the windup 106 is increased, so that the substrate wound between the second roller 102 and the windup 106 is stretched, and further, the tension of the substrate between the second roller 102 and the third roller 105 is increased, and the tension of the substrate 10 wound on the second roller 102 is increased. When the tension of the substrate wound around the second roller 102 increases to the coating tension, the adjustment of the position of the third roller 105 is stopped so that the third roller 105 is maintained at the current position, so that the tension of the substrate wound around the second roller 102 is maintained at the coating tension, and the substrate positioned between the first roller 101 and the third roller 105 is in a stable coating tension state.

In another embodiment, the position of the second roller 102 is adjustable, and thus, the process of stretching the substrate between the first roller 101 and the third roller 105 may include:

the position of the second roller 102 is adjusted such that the second roller 102 is away from the first roller 101 and the third roller 105, such that the winding path length between the first roller 101 and the third roller 105 is increased, stretching the substrate between the first roller 101 and the third roller 105. As shown in fig. 2, the C position is an initial position of the secondary roller shaft 102, and when the secondary roller shaft 102 is located at the C position, the height of the secondary roller shaft 102 with respect to the primary roller shaft 101 or the tertiary roller shaft 105 is h 1. C' is a position of the second roller shaft 102 during the adjustment, and when the second roller shaft 102 is adjusted from the C position to the C position, the height of the second roller shaft 102 with respect to the first roller shaft 101 or the third roller shaft 105 is increased from h1 to h2, so that the winding path length between the first roller shaft 101 and the third roller shaft 105 is increased, so that the substrate wound on the second roller shaft 102 is stretched, so that the tension of the substrate 10 wound on the second roller shaft 102 is increased. When the tension of the substrate wound around the second roller 102 increases to the coating tension, the adjustment of the position of the second roller 102 is stopped so that the second roller 102 is maintained at the current position, so that the tension of the substrate wound around the second roller 102 is maintained at the coating tension, and the substrate located between the first roller 101 and the third roller 105 is in a stable coating tension state.

It is easily understood that, in another embodiment, the positions of any two of the first roller 101, the second roller 102 and the third roller 105 may be adjusted simultaneously, or the positions of the first roller 101, the second roller 102 and the third roller 105 may be adjusted simultaneously, so that the winding path length between the unwinding device 100 and the winding device 106 is increased, the tension of the substrate 10 wound on the second roller 102 is increased, and the substrate between the first roller 101 and the third roller 105 is in the coating tension state.

While the tension of the substrate wound on the second roll 102 is maintained at the coating tension, the coating device 103 performs coating to coat the electrode material on the substrate wound on the second roll 102. The drying device 104 dries the electrode material coated on the substrate 10. After the dried electrode material passes through the third roller 150 along with the substrate, the substrate is restored to the normal stretching state to obtain the composite stretchable electrode, and the stretchable electrode is wound on the winding device 106 along with the substrate.

When the coating is stopped, the stretch adjusting device 20 may be adjusted to return the stretch adjusting device 20 to the initial state, and the substrate may be contracted such that the tension of the substrate wound on the second roll 102 is reduced to return to the natural stretching state.

The third embodiment:

based on the inventive concept of the above embodiments, the embodiments of the present invention provide a method of preparing an electrode. Fig. 3 is a schematic view of a method of preparing an electrode according to a third embodiment of the present invention, which may include:

stretching the stretchable substrate using a roll-to-roll apparatus;

and coating conductive ink on the stretched substrate by using a coating device to form an electrode layer.

According to the method for preparing the electrode, provided by the embodiment of the invention, the stretchable substrate is stretched by adopting a roll-to-roll device, so that a roll-to-roll process is applied to production equipment of the stretchable electrode, and the online production of the stretchable electrode is realized; the manufacturing cost of the stretchable electrode is reduced by utilizing the characteristics of simplicity, convenience and high efficiency of a roll-to-roll process, and the mass production of the stretchable electrode is realized.

The roll-to-roll apparatus used in the preparation of the electrode may be any of the roll-to-roll apparatuses in the above embodiments.

To increase the adhesion of the electrode layer to the substrate, prior to stretching the stretchable substrate using a roll-to-roll apparatus, the method further comprises: and carrying out surface hydrophilic treatment on the substrate. Specifically, the substrate may be subjected to a plasma surface treatment or a coupling agent treatment to change the hydrophilic ability of the substrate surface, thereby enhancing the adhesion ability of the substrate to the conductive ink.

In order to further enhance the adhesion of the substrate to the electrode layer, the method of preparing the electrode may further include: and drying the formed electrode layer. The drying temperature is 60-80 ℃.

In the description of the embodiments of the present invention, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. An apparatus for preparing an electrode, comprising:

a roll-to-roll apparatus for stretching the stretchable substrate to a coating stretched state and returning to a natural stretched state;

a coating device for coating conductive ink on the stretched substrate to form an electrode layer;

the roll-to-roll device comprises an unreeling device, a reeling device and a stretching adjusting device arranged between the unreeling device and the reeling device, a stretchable substrate unreeled by the unreeling device is reeled on the reeling device after being reeled by the stretching adjusting device, and the stretching adjusting device is used for stretching the substrate reeled on the stretching adjusting device to a coating stretching state and recovering to a natural stretching state;

when the substrate on the stretching adjusting device is stretched to a coating stretching state, the substrate has coating tension, so that the electrode layer formed by the conductive ink coated on the stretched substrate by the coating device is stretchable;

the electrode layer is of a net structure.

2. The apparatus of claim 1, wherein the stretching adjusting device comprises a first roller, a second roller and a third roller, the substrate fed from the unwinding device is sequentially wound on the winding device after passing through the first roller, the second roller and the third roller, the rotation speed of the first roller or/and the third roller is adjustable, and the rotation speed of the first roller or/and the third roller is adjusted so that the rotation speed of the third roller is greater than that of the first roller, so as to stretch the substrate between the first roller and the third roller.

3. The apparatus of claim 1, wherein the stretch adjusting device comprises a first roller, a second roller, and a third roller, the substrate paid out by the unreeling device is sequentially wound on the reeling device after passing through the first roller, the second roller, and the third roller, a position of the second roller is adjustable, and the second roller is adjusted so as to be away from the first roller and the third roller, so as to stretch the substrate between the first roller and the third roller.

4. The apparatus of claim 1, further comprising a drying device for drying the formed electrode layer.

5. A method of preparing an electrode, comprising:

stretching the stretchable substrate to a coating stretched state using a roll-to-roll apparatus;

coating conductive ink on the stretched substrate by using a coating device to form an electrode layer;

recovering the stretchable substrate which is stopped being coated to a natural stretching state by using the roll-to-roll device;

the roll-to-roll device comprises an unreeling device, a reeling device and a stretching adjusting device arranged between the unreeling device and the reeling device, wherein the stretchable substrate unreeled by the unreeling device is reeled on the reeling device after being reeled by the stretching adjusting device, and the stretching adjusting device is used for stretching the substrate reeled on the stretching adjusting device to a coating stretching state and recovering to a natural stretching state;

when the substrate on the stretching adjusting device is stretched to a coating stretching state, the substrate has a coating tension, so that the electrode layer formed by the conductive ink coated on the stretched substrate by the coating device can be stretched, and the size of the coating tension is determined according to the property of the substrate;

the electrode layer is of a net structure.

6. The method of claim 5, wherein prior to said stretching the stretchable substrate using a roll-to-roll apparatus, the method further comprises:

and carrying out plasma surface treatment on the substrate, or carrying out coupling agent treatment on the substrate.

7. The method of claim 5, further comprising:

and drying the formed electrode layer.

8. The method of claim 7, wherein the temperature of the drying is 60 ℃ to 80 ℃.

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