KR20130063365A - Energy harvesting device and method for producing thereof - Google Patents

Abstract

PURPOSE: An energy harvesting device and a method for manufacturing the same are provided to increase the contact area of an electrode plate and a dielectric plate and to secure high capacitance. CONSTITUTION: A first electrode plate(210) is formed in one surface of an elastic dielectric plate(100). A second electrode plate(220) is formed in the other surface of the elastic dielectric plate. A contact structure is formed in at least one of two surfaces of the elastic dielectric plate. The contact structure is a nano-wire shape(310). The contact structure is made of the same material as the elastic dielectric plate.

Description

Energy harvesting device and method for manufacturing same {ENERGY HARVESTING DEVICE AND METHOD FOR PRODUCING THEREOF}

The present invention relates to energy harvesting, and more particularly, to a device for harvesting energy using a change in capacitance and a method of manufacturing the same.

As miniaturization of electronic devices and integration of devices are rapidly made and wireless communication technologies are developed, the entire industry is focused on miniaturization and wirelessization. Accordingly, there is an increasing need for miniaturized electronic devices or integrated devices that can be driven without connecting wires or changing batteries from the outside, and energy harvesting for supplying power to these electronic devices or devices. Research is being done on technologies related to this.

Large-scale energy harvesting using sunlight or hydropower has been around for a long time. However, research on a technique of harvesting fine-scale energy capable of supplying power to miniaturized electronic devices or integrated devices has been relatively recently received attention.

In particular, EAP (Electroactive Polymer) is a polymer that can exhibit expansion, contraction and warpage by electrical stimulation. When electrical stimulation is applied, mechanical movement can be obtained. It can be applied to actuators or sensors. In addition, since the electroactive polymer (EAP) generates electrical energy when the shape is changed, it may be utilized in the technology related to energy harvesting.

1 is a conceptual diagram of an energy harvesting device using a conventional electroactive polymer (EAP). The conventional energy harvesting element is composed of the elastic electrode plate 20, the elastic dielectric plate 10. The energy harvesting device using the conventional electroactive polymer (EAP) harvested energy from the difference in capacitance due to the stretching phenomenon of the electroactive polymer (EAP) generated by external force by applying elastic electrodes on both ends of the dielectric. . In particular, the amount of energy harvested from the device that harvests energy from the difference in capacitance by using an electroactive polymer (EAP) has a characteristic proportional to the initial capacitance.

However, energy harvesting devices using most electroactive polymers (EAPs) have a problem in that an initial capacitance per unit volume is small due to a small contact area between electrode plates and dielectric plates.

An object of the present invention for solving the above problems is to provide an energy harvesting device in which the amount of energy harvested is increased by increasing the initial capacitance by increasing the contact area between the electrode plate and the dielectric plate.

Another object of the present invention for solving the above problems is to provide a method for manufacturing an energy harvesting device in which the amount of energy harvested is increased by increasing the initial capacitance by increasing the contact area between the electrode plate and the dielectric plate. have.

An energy harvesting device according to an embodiment of the present invention for achieving the above object, an elastic dielectric plate, a first electrode plate formed on one surface of the elastic dielectric plate, and a second electrode plate formed on the other surface of the elastic dielectric plate And a contact structure formed on at least one of one surface and the other surface of the elastic dielectric plate to penetrate at least one of the first electrode plate and the second electrode plate.

Here, the contact structure may be made of the same material as the elastic dielectric plate.

Here, the contact structure may be in the form of nano-wire or nano-dot.

Here, the first electrode plate and the second electrode plate may be a conductive polymer having elastic force.

Energy harvesting device according to another embodiment of the present invention for achieving the above object, the elastic dielectric plate, the first electrode plate formed on one surface of the elastic dielectric plate and the second electrode plate formed on the other surface of the elastic dielectric plate Including, but at least one of the first electrode plate and the second electrode plate may be characterized in that the contact structure which is in contact with the elastic dielectric plate is formed.

According to another aspect of the present invention, there is provided a method of manufacturing an energy harvesting device, the method including: forming a contact structure on one surface of an elastic dielectric plate, and forming a first electrode plate on one surface of the elastic dielectric plate on which the contact structure is formed. Forming a contact structure on the other surface of the elastic dielectric plate, and forming a second electrode plate on the other surface of the elastic dielectric plate on which the contact structure is formed.

Here, the first electrode plate and the second electrode plate may be formed in a state in which the contact structure penetrates the first electrode plate and the second electrode plate.

When using the energy harvesting device using the variable capacitance according to the present invention as described above can increase the area in contact with the electrode plate and the dielectric plate can provide an energy harvesting device with a large capacitance.

In addition, when using an energy harvesting device using a variable capacitance according to the present invention can provide a method for manufacturing an energy harvesting device having a large capacitance by increasing the area in contact between the electrode plate and the dielectric plate.

In addition, the energy harvesting device using the variable capacitance according to the present invention has the advantage that can increase the amount of energy harvested by increasing the initial capacitance.

1 is a conceptual diagram of an energy harvesting device using a conventional electroactive polymer.
2 is a conceptual diagram of an energy harvesting device using an electroactive polymer having nano-wires formed thereon according to an embodiment of the present invention.
3 is a conceptual diagram of an energy harvesting device using an electroactive polymer having nano-dots formed thereon according to another exemplary embodiment of the present invention.
4 is a flowchart illustrating a method of manufacturing an energy harvesting device according to an embodiment of the present invention.
5 is an electron micrograph of a nano-wire formed of an electrospinning apparatus according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Referring to the electrical energy stored in the capacitor that is the concept of the present invention.

When voltage is applied between two conductor plates, negative charges are collected on the cathode and positive charges on the anode. Capacitors use this phenomenon to charge or discharge charges in electronic circuits.

When the charge Q is charged in the capacitor having the capacitance C, the electric energy W stored in the battery may be represented by Equation 1. Here, V means the voltage applied to the two conductor plates.

이라고 하면 정전용량은 수학식 2와 같이 나타낼 수 있다. In the case of a parallel plate capacitor, the magnitude of the capacitance C of the capacitor is proportional to the area A of the electrode and inversely proportional to the distance d between the electrodes. That is, the dielectric constant of the dielectric between the electrodes

In this case, the capacitance can be expressed as in Equation 2.

라 하고 외력이 제거되었을 경우의 정전용량을

라 하면,

의 관계가 성립한다.
If an external force is applied to the parallel plate capacitor with elastic force and the area of the plate of the capacitor is doubled, the thickness of the capacitor is reduced to 1/2. In addition, when the external force is removed, the elastic capacitor returns to its original state. The capacitance when an external force

And the capacitance when the external force is removed

Say,

.

In addition, when a constant voltage V is applied to the parallel plate capacitor, the difference between the energy stored in the parallel plate capacitor when the external force is applied and when the external force is removed is obtained as in Equation (3).

Here, W _e means the electric energy stored in the capacitor when the external force is applied to increase the plate area of the parallel plate capacitor, and W _i is stored in the capacitor when the external force is removed and the parallel plate capacitor is returned to its original state. Means electrical energy.

Therefore, referring to Equation 3, energy may be harvested using the difference in electrical energy stored in the capacitor when the external force is applied and the external force is removed.

In addition, the magnitude of the electrical energy that can be harvested from the external force of the same size is proportional to the magnitude of the charge amount (Q) or the capacitance (C) with reference to equations (1) and (3).

), 일정한 정전용량(C)에서 전하량(Q)을 증가시키기 위해서는 인가하는 전압(V)을 증가시켜야 한다. 다만, 인가되는 전압(V)이 커질 경우에는, 이동성이 중요시되는 소형의 전자장치에 적용하기 어렵다. 또한, 낮은 전압(V)에서는 전하량(Q)이 전압(V)의 증가에 따라 선형적으로 증가하나, 높은 전압(V)에서는 전하량(Q)이 전압(V)에 선형적으로 증가하지 않아 효율성이 감소되는 문제점이 있다. Here, since the charge amount Q is proportional to the capacitance C,

In order to increase the amount of charge Q at a constant capacitance C, the voltage V to be applied must be increased. However, when the applied voltage V is large, it is difficult to apply to a small electronic device in which mobility is important. Also, at low voltage (V), the charge amount (Q) increases linearly with the increase of the voltage (V), but at high voltage (V), the charge amount (Q) does not increase linearly with the voltage (V). There is a problem that is reduced.

Therefore, it is efficient to increase the amount of energy harvested by increasing the capacitance C. Referring to Equation 2, in order to increase the capacitance C, it is necessary to increase the dielectric constant epsilon or the contact area A of the electrode and the dielectric or reduce the thickness d of the capacitor.

The dielectric constant (ε) of the dielectric depends on the characteristics of the material. In general, a dielectric having a high dielectric constant has a large leakage current and is not chemically stable.

In addition, reducing the thickness d of the battery has limitations in the electrode and the dielectric having elastic force. When the electrode and dielectric having elastic force are made too thin in the capacitor which repeats stretching and contracting by external force, the durability of the capacitor can be reduced.

Therefore, it is desirable to increase the capacitance C of the capacitor by increasing the contact area A of the electrode and the dielectric.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a conceptual diagram of an energy harvesting device using an electroactive polymer having nano-wires formed thereon according to an embodiment of the present invention.

Referring to FIG. 2, the energy harvesting device using the variable capacitance according to the present invention includes an elastic dielectric plate 100, a first electrode plate 210, a second electrode plate 220, and a contact structure.

The first electrode plate 210 and the second electrode plate 220 may be formed on one surface of the elastic dielectric plate 100 with the elastic dielectric plate 100 interposed therebetween. That is, the first electrode plate 210 may be formed on one surface of the elastic dielectric plate 100, and the second electrode plate 220 may be formed on the other surface of the elastic dielectric plate 100. In addition, a voltage V may be applied to both ends of the first electrode plate 210 and the second electrode plate 220.

The contact structure may be formed on one side or both sides of the elastic dielectric plate 100. The contact structure may be made of the same material as the elastic dielectric plate 100. The contact structure may be formed to penetrate the first electrode plate 210 and the second electrode plate 220. The contact structure must be formed to penetrate at least one of the first electrode plate 210 and the second electrode plate 220 to effectively increase the contact area between the elastic dielectric plate 100 and the electrode plates 210 and 220. have. Accordingly, the contact structure is formed on at least one of the first electrode plate 210 and the second electrode plate 220, and the first electrode plate 210 and the second electrode plate 220 are elastic dielectric plates 100. When formed by, for example, evaporation, the contact structure may be brought into contact with the elastic dielectric plate 100.

The contact structure may have the form of a nano-wire 310. The nanowire 310 refers to an extremely fine wire having a diameter of several nanometers, and the nanowire 310 may be formed on one or both surfaces of the elastic dielectric plate 100. That is, the contact structure having the shape of the nanowire 310 may increase the contact area between the elastic dielectric plate 100 and the electrode plates 210 and 220, thereby increasing the capacitance of the capacitor. For example, an initial capacitance of the parallel plate capacitor is increased, and the initial capacitance may mean a capacitance in a state in which no external force is applied to the parallel plate capacitor.

Since the first electrode plate 210 and the second electrode plate 220 have elastic force, the first electrode plate 210 and the second electrode plate 220 may be deformed by an external force and then returned to their original state. In addition, the first electrode plate 210 and the second electrode plate 220 may be made of a conductive polymer material having the same conductive material. For example, the first electrode plate 210 and the second electrode plate 220 may be made of doped polyethylene, polythiophene, or the like.

In addition, the elastic dielectric plate 100 to be applied to the present invention is a dielectric having elastic force, but there is no particular limitation on the material, but may be a dielectric of a polymer having a relatively high dielectric constant. For example, the elastic dielectric plate 100 may be made of polyester, polystyrene, polyethylene, or the like as main components.

Therefore, in the present invention, the electrode plates 210 and 220 having elastic force made of a conductive polymer material and the elastic dielectric plate 100 made of a dielectric of a polymer having elastic force are combined, and the electrode plates 210 and 220 and the elastic dielectric plate ( It is possible to provide an energy harvesting device made of an electroactive polymer (EAP) having a contact structure formed on a surface to which 100 is bonded.

3 is a conceptual diagram of an energy harvesting device using an electroactive polymer having nano-dots formed thereon according to another exemplary embodiment of the present invention.

Referring to FIG. 3, the energy harvesting device according to the embodiment of the present invention may include an elastic dielectric plate 100, a first electrode plate 210, a second electrode plate 220, and a nano-dot 320. It includes.

In FIG. 3, the contact structure may be formed in the form of a nano-dot 320. The nano dot 320 may be a dome-shaped structure having a diameter of several nanometers.

The nano dot 320 may be formed on one or both surfaces of the elastic dielectric plate 100 as in the embodiment of FIG. 2. The nano dot 320 may be formed to penetrate at least one of the first electrode plate 210 and the second electrode plate 220. The nano dot 320 must be formed to penetrate the first electrode plate 210 and the second electrode plate 220 to effectively increase the contact area between the elastic dielectric plate 100 and the electrode plates 210 and 220. have. That is, the contact structure having the shape of the nano dot 320 may increase the contact area between the elastic dielectric plate 100 and the electrode plates 210 and 220, thereby increasing the initial capacitance of the capacitor.

In addition, a method of forming the contact structure on the elastic dielectric plate 100 is not particularly limited, but the nanowires 310 and the nano dots 320 are formed on the elastic dielectric plate 100 by using an electrospinning method. can do.

4 is a flowchart illustrating a method of manufacturing an energy harvesting device according to an embodiment of the present invention.

Referring to FIG. 4, the method of manufacturing the energy harvesting device according to the present invention includes forming the contact structure on the elastic dielectric plate 100 and the electrode plate 210 on both sides of the elastic dielectric plate 100 on which the contact structure is formed. 220).

The method of manufacturing an energy harvesting device according to an embodiment of the present invention includes forming a contact structure on one surface of the elastic dielectric plate 100 (S100) and a first surface on one surface of the elastic dielectric plate 100 on which the contact structure is formed. Forming a contact structure on the other surface of the elastic dielectric plate 100 and forming the electrode plate 210 (S110) and a second electrode plate on the other surface of the elastic dielectric plate 100 on which the contact structure is formed. And forming a step (S130).

That is, after the elastic electrode plate 210 is formed on one surface of the elastic dielectric plate 100 on which the contact structure is formed, the contact structure is formed on the other surface of the elastic dielectric plate 100. In this way, the electrode plate 220 may be formed while the contact structure formed on the elastic dielectric plate 100 maintains its shape.

In addition, the contact structure may be a nano-wire (310), the nano-wire 310 may be formed on the elastic dielectric plate 100 by the electrospinning method.

In addition, the first electrode plate 210 and the second electrode plate 220 may have a contact structure such as the nanowire 310 or the nano dot 320 formed on the elastic dielectric plate 100 and the first electrode plate 210. It may be formed to penetrate the second electrode plate 220. When the contact structure is formed to penetrate the first electrode plate 210 and the second electrode plate 220, the contact area between the elastic dielectric plate 100 and the electrode plates 210 and 220 may be increased.

5 is an electron micrograph of a nano-wire formed of an electrospinning apparatus according to an embodiment of the present invention.

Referring to FIG. 5, the nanowires 310 are formed on one surface or both surfaces of the elastic dielectric plate 100. The nanowires 310 formed on the elastic dielectric plate 100 may be coupled to the elastic dielectric plate 100 having a structure intertwined with each other such as a net. In addition, the nanowires 310 may be formed by electrospinning.

The present invention as described above provides an energy harvesting device in which electrode plates are deposited on both sides of an elastic dielectric plate having contact structures formed on one or both surfaces thereof. In particular, the initial capacitance can be increased by forming the contact structure on one or both sides of the elastic dielectric plate, and forming the electrode plate so that the contact structure penetrates the electrode plate, thereby increasing the contact area between the elastic dielectric plate and the electrode plate. .

In addition, in the embodiment of the present invention, it has been described that the contact structure may have the shape of nano-wire or nano-dot, but it will increase the contact area between the elastic dielectric plate and the electrode plate. As long as it can be a shape, there is no special limitation in the shape.

In addition, the contact structure may be formed in various sizes ranging from a few nanometers to several micrometers.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

100: elastic dielectric plate
210: first electrode plate 220: second electrode plate
310: nanowire 320: nanodot

Claims (11)

Elastic dielectric plates;
A first electrode plate formed on one surface of the elastic dielectric plate;
A second electrode plate formed on the other surface of the elastic dielectric plate; And
An energy harvesting device comprising a contact structure formed on at least one of one surface and the other surface of the elastic dielectric plate, the contact structure penetrating at least one of the first electrode plate and the second electrode plate. The method according to claim 1, wherein the contact structure,
An energy harvesting element, characterized in that formed on the elastic dielectric plate by the electrospinning method. The method according to claim 1, wherein the contact structure,
Energy harvesting device, characterized in that made of the same material as the elastic dielectric plate. The said contact structure of any one of Claims 1-3,
Energy harvesting device, characterized in that the form of nano-wire (nano-wire) or nano-dot (nano-dot). The said 1st electrode plate and the said 2nd electrode plate are any one of Claims 1-3,
Energy harvesting device, characterized in that the conductive polymer having an elastic force. Elastic dielectric plates;
A first electrode plate formed on one surface of the elastic dielectric plate; And
Including a second electrode plate formed on the other surface of the elastic dielectric plate,
And at least one of the first electrode plate and the second electrode plate is formed with a contact structure capable of contacting the elastic dielectric plate. The method according to claim 6, wherein the contact structure,
Energy harvesting device, characterized in that the form of nano-wire (nano-wire) or nano-dot (nano-dot). The method according to claim 6, wherein the first electrode plate and the second electrode plate,
Energy harvesting device, characterized in that the conductive polymer having an elastic force. In the method of manufacturing the energy harvesting device,
Forming a contact structure on one surface of the elastic dielectric plate;
Forming a first electrode plate on one surface of the elastic dielectric plate on which the contact structure is formed;
Forming the contact structure on the other surface of the elastic dielectric plate; And
And forming a second electrode plate on the other surface of the elastic dielectric plate having the contact structure formed thereon. The method according to claim 9, wherein the contact structure,
Method of manufacturing an energy harvesting device, characterized in that formed in the form of nano-wire (nano-wire) or nano-dot (nano-dot) using the electrospinning method. The method according to claim 9 or 10, wherein the first electrode plate and the second electrode plate,
And the contact structure is formed while penetrating the first electrode plate and the second electrode plate.

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