KR102276426B1 - Secondary battery having high rate capability and high energy density - Google Patents

Abstract

Disclosed is a secondary battery having a structure in which both energy density and rate characteristics can be improved. The disclosed secondary battery includes a first electrode current collector layer and a second electrode current collector layer disposed to face each other, a plurality of electrically contacting the first electrode current collector layer and disposed perpendicular to the first electrode current collector layer A first active material layer, a plurality of second active material layers in electrical contact with the second electrode current collector layer and disposed perpendicular to the second electrode current collector layer, and in electrical contact with the first electrode current collector layer It may include a first conductor layer inserted into the plurality of first active material layers.

Description

Secondary battery with improved energy density and rate characteristics {Secondary battery having high rate capability and high energy density}

The disclosed embodiments relate to a secondary battery, and more particularly, to a secondary battery having a structure in which both energy density and rate characteristics can be improved.

A secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged, and is widely used in the field of high-tech electronic devices such as cell phones, notebook computers, and camcorders.

In particular, lithium batteries have advantages of higher voltage and higher energy density per unit weight than nickel-cadmium batteries or nickel-hydrogen batteries, which are widely used as power sources for portable electronic equipment, and thus demand for lithium batteries is increasing. A lithium-based oxide is mainly used as a positive active material of a lithium battery, and a carbon material is mainly used as a negative active material of a lithium battery. In addition, lithium batteries are generally classified into liquid electrolyte batteries and polymer solid electrolyte batteries according to the type of electrolyte. A battery using a liquid electrolyte is called a lithium ion battery, and a battery using a polymer solid electrolyte is a lithium polymer battery. It is said

In such a lithium battery, research is being conducted to further improve energy density and rate capability. An improvement in energy density may increase the capacity of a lithium battery, and an improvement in rate characteristics may increase a charging rate of a lithium battery.

Provided is a secondary battery having a structure in which both energy density and rate characteristics can be improved.

A battery according to an embodiment includes a first electrode current collector layer and a second electrode current collector layer disposed to face each other; a plurality of first active material layers in electrical contact with the first electrode current collector layer and disposed perpendicular to the first electrode current collector layer; a plurality of second active material layers in electrical contact with the second electrode current collector layer and disposed perpendicular to the second electrode current collector layer; between the plurality of first active material layers and the second active material layer, between the plurality of first active material layers and the second electrode current collector layer, and between the plurality of second active material layers and the first electrode current collector layer, respectively an electrolyte layer disposed; and a first conductor layer electrically in contact with the first electrode current collector layer and inserted into the plurality of first active material layers.

For example, the first electrode current collector layer and the second electrode current collector layer may have a flat plate shape disposed parallel to each other.

In addition, the first electrode current collector layer and the second electrode current collector layer may have a curved plate shape having a curvature and may be disposed parallel to each other.

The plurality of first active material layers are in contact with a first surface of the first electrode current collector layer, and the plurality of second active material layers are in contact with a second surface of the second electrode current collector layer, and the first surface The first electrode current collector layer and the second electrode current collector layer may be disposed such that the second surface and the second surface face each other.

The plurality of first active material layers are disposed perpendicular to the first surface of the first electrode current collector layer, and the plurality of second active material layers are disposed perpendicular to the second surface of the second electrode current collector layer. can be

For example, the plurality of first active material layers and the plurality of second active material layers may have a flat plate shape, and the plurality of first active material layers and the plurality of second active material layers may be alternately arranged side by side.

The first conductor layer may have a flat plate shape extending vertically protruding from the first surface of the first electrode current collector layer.

The first conductor layer may be inserted into at least a portion of the active material layer among the plurality of first active material layers, and may be disposed such that both surfaces of the first conductor layer are in contact with the first active material layer.

A first end of the first conductor layer may contact a first surface of the first electrode current collector layer, and a second end of the first conductor layer opposite the first end may contact the electrolyte layer. .

A first end of the first conductor layer is in contact with a first surface of the first electrode current collector layer, and a second end of the first conductor layer opposite the first end is in contact with the first active material layer. can

For example, the electrolyte layer may include a solid electrolyte.

The electrolyte layer is disposed between the plurality of first active material layers and the second active material layer, between the plurality of first active material layers and the second electrode current collector layer, and between the plurality of second active material layers and the first electrode current collector. It may be formed to serpentine along between the layers.

The battery may further include a second conductor layer electrically in contact with the second electrode current collector layer and inserted into the plurality of second active material layers.

For example, the second conductor layer may have a flat plate shape extending vertically from the second electrode current collector layer.

The second conductor layer may be inserted into at least some of the active material layers among the plurality of second active material layers, and may be disposed such that both surfaces of the second conductor layer are in contact with the second active material layer.

A first end of the second conductor layer may contact the second electrode current collector layer, and a second end of the second conductor layer opposite to the first end may contact the electrolyte layer.

A first end of the second conductor layer may contact the second electrode current collector layer, and a second end of the second conductor layer opposite to the first end may contact the second active material layer.

For example, the first active material layer may be formed of a positive electrode active material including a ceramic sintered body having a positive electrode composition.

In addition, a battery according to another embodiment includes a first electrode current collector layer having a flat plate shape; a plurality of first active material layers in electrical contact with the first electrode current collector layer and disposed perpendicular to the first electrode current collector layer; a conductor layer electrically in contact with the first electrode current collector layer and inserted into the plurality of first active material layers; a plurality of first portions alternately arranged in parallel with the plurality of first active material layers, and a second portion disposed to face in parallel with the first electrode current collector layer and extending from the plurality of first portions; a second active material layer; and between the plurality of first portions of the plurality of first active material layers and the second active material layer, between the plurality of first active material layers and the second portion of the second active material layer, and between the plurality of second active material layers. and an electrolyte layer disposed between the first portion and the first electrode current collector layer, respectively.

The plurality of first and second portions of the plurality of second active material layers may be integrally formed.

The conductive layer may be inserted into at least a portion of the active material layer among the plurality of first active material layers, and may be disposed such that both surfaces of the conductive layer are in contact with the first active material layer.

A first end of the conductor layer may contact the first electrode current collector layer, and a second end of the conductor layer opposite to the first end may contact the electrolyte layer.

A first end of the conductor layer may contact the first electrode current collector layer, and a second end of the conductor layer opposite to the first end may contact the first active material layer.

The electrolyte layer, between the plurality of first portions of the plurality of first active material layers and the second active material layer, between the plurality of first active material layers and the second portion of the second active material layer, and the second active material A plurality of first portions of the layer may be formed to be meandering along between the first electrode current collector layer.

In the case of the secondary battery according to the disclosed embodiment, since the plurality of positive electrode active material layers and the plurality of negative electrode active material layers are disposed in a direction perpendicular to the positive electrode current collector layer and the negative electrode current collector layer, the energy density and rate of the secondary battery properties can be improved at the same time. For example, if the height of the unit cell of the secondary battery is increased, the response area increases in proportion to the height, so that rate characteristics may be improved. In addition, when the height of the unit cell of the secondary battery is increased, the fraction occupied by the positive active material and the negative active material in the secondary battery increases, so that the energy density of the secondary battery can be improved.

Since the unit cell of the secondary battery can be manufactured in a very small size, it may be suitable for a battery of a small device such as a mobile device or a wearable device.

1 is a perspective view schematically illustrating a structure of a unit cell of a secondary battery according to an exemplary embodiment.
FIG. 2 is an exploded perspective view schematically illustrating a structure of a unit cell of the secondary battery shown in FIG. 1 .
3 is a cross-sectional view schematically illustrating a structure of a unit cell of a secondary battery according to another exemplary embodiment.
4 is a perspective view schematically illustrating a structure of a unit cell of a secondary battery according to a comparative example.
5 is a graph showing the comparison between the example shown in FIG. 1 and the comparative example shown in FIG. 4 with respect to the relationship between the height of the unit cell and the reaction area.
6 is a graph showing a comparison between the example shown in FIG. 1 and the comparative example shown in FIG. 4 for the relationship between the height of the unit cell and the fraction of the active material.
7 is a perspective view schematically illustrating a structure of a unit cell of a secondary battery according to another exemplary embodiment.
8 is a perspective view schematically illustrating a structure of a unit cell of a secondary battery according to another exemplary embodiment.
9A and 9B are a perspective view and an exploded perspective view schematically illustrating a structure of a unit cell of a secondary battery according to still another exemplary embodiment;
10 is a perspective view exemplarily illustrating a stacked structure formed by stacking a plurality of unit cells of the secondary battery shown in FIG. 1 .

Hereinafter, a secondary battery with improved energy density and rate characteristics will be described in detail with reference to the accompanying drawings. In the following drawings, the same reference numerals refer to the same components, and the size of each component in the drawings may be exaggerated for clarity and convenience of description. In addition, the embodiments described below are merely exemplary, and various modifications are possible from these embodiments. In addition, in the layer structure described below, the expression "upper" or "upper" may include not only directly above in contact, but also above in non-contact.

FIG. 1 is a perspective view schematically illustrating a structure of a unit cell of a secondary battery 100 according to an exemplary embodiment, and FIG. 2 is an exploded perspective view schematically illustrating a structure of a unit cell of the secondary battery 100 shown in FIG. 1 . . 1 and 2 , the secondary battery 100 according to the present embodiment includes a first electrode current collector layer 101 , a second electrode current collector layer 111 , and a first electrode collector disposed to face each other. A plurality of first active material layers 102 in electrical contact with the entire layer 101 , a plurality of second active material layers 112 in electrical contact with the second electrode current collector layer 111 , and a plurality of first active materials Between the layer 102 and the second active material layer 112 , between the plurality of first active material layers 102 and the second electrode current collector layer 111 , and between the plurality of second active material layers 112 and the first electrode collector It may include an electrolyte layer 120 respectively disposed between the entire layer 101 . In addition, the secondary battery 100 is in electrical contact with the first electrode current collector layer 101 and the first conductive layer 103 and the second electrode collection inserted into the plurality of first active material layers 102 . A second conductor layer 113 electrically in contact with the entire layer 111 and inserted into the plurality of second active material layers 112 may be further included.

The first electrode current collector layer 101 and the second electrode current collector layer 111 are, for example, Cu, Au, Pt, Ag, Zn, Al, Mg, Ti, Fe, Co, Ni, Ge, In , Pd, etc. may be made of a conductive metal material. As shown in FIGS. 1 and 2 , the first electrode current collector layer 101 and the second electrode current collector layer 111 may be formed in a flat plate shape, and may be disposed parallel to each other.

The first active material layer 102 may be in electrical contact with the surface of the first electrode current collector layer 101 , and the second active material layer 112 may be in electrical contact with the surface of the second electrode current collector layer 111 . can do. For example, the first active material layer 102 and the second active material layer 112 may be respectively attached to the surfaces of the first electrode current collector layer 101 and the second electrode current collector layer 111 facing each other. . Here, the first active material layer 102 may be made of a mixture of a positive electrode active material, a conductive material, and a binder, and the first electrode current collector layer 101 may be a positive electrode current collector. In addition, the first active material layer 102 may be formed of only the positive active material itself without a conductive material or a binder. For example, the first active material layer 102 may be formed of a ceramic sintered body having a positive electrode composition such as _{LiCoO 2 or sintered polycrystalline ceramics or single crystal.} The second active material layer 112 may be made of a mixture of an anode active material, a conductive material, and a binder, and the second electrode current collector layer 111 may be an anode current collector. In addition, the second active material layer 112 may be formed of only the negative active material itself without a conductive material or a binder. For example, the second active material layer 112 may be formed of a negative electrode metal such as lithium (Li) metal.

1 and 2 , the plurality of first active material layers 102 and the plurality of second active material layers 112 include a first electrode current collector layer 101 and a second electrode current collector layer 111 . ) may be disposed substantially perpendicular to the For example, the first active material layer 102 is disposed to protrude substantially perpendicular to the surface of the first electrode current collector layer 101 , and the second active material layer 112 is provided with the second electrode current collector 111 . It may be arranged to protrude substantially perpendicular to the surface of the. However, the first and second active material layers 102 and 112 do not need to be perfectly perpendicular to the first and second electrode current collector layers 101 and 111 , and may be disposed at an angle. In addition, the plurality of first active material layers 102 and the plurality of second active material layers 112 may be formed in a flat plate shape, and may be alternately disposed in parallel with each other. That is, the first active material layers 102 and the plurality of second active material layers 112 are interposed between the first electrode current collector layer 101 and the second electrode current collector layer 111 and the first electrode current collector layer ( 101 ) and the second electrode current collector layer 111 may be disposed perpendicularly, and alternately in a direction parallel to the surface of the first electrode current collector layer 101 and the second electrode current collector layer 111 . can be arranged.

The electrolyte layer 120 may be disposed such that the plurality of first active material layers 102 do not directly contact the plurality of second active material layers 112 and the second electrode current collector layer 111 . In addition, the electrolyte layer 120 may be disposed such that the plurality of second active material layers 112 do not directly contact the plurality of first active material layers 102 and the first electrode current collector layer 101 . To this end, the electrolyte layer 120 is formed between a plurality of first active material layers 102 and a plurality of second active material layers 112, a plurality of first active material layers 102 and a second electrode current collector layer ( 111) and between the plurality of second active material layers 112 and the first electrode current collector layer 101 may be formed in a tortuous shape. Accordingly, the first active material layer 102 and the second active material layer 112 may exchange metal ions through the electrolyte layer 120 without directly contacting each other. In addition, the first electrode current collector layer 101 may be electrically connected only to the first active material layer 102 , and the second electrode current collector layer 111 may be electrically connected only to the second active material layer 112 . According to the present embodiment, the electrolyte layer 120 may be formed of a solid electrolyte fixed in a serpentine shape. For example, the electrolyte layer 120 is Li ₃ PO ₄ , Li ₃ PO _4-x N _x , LiBO _2-x N _x , Li ₃ PO ₄ N _x , LiBO ₂ N _x , Li ₄ SiO ₄ -Li ₃ a solid electrolyte such as _{PO 4} , Li ₄ SiO ₄ -Li ₃ VO _{4 , or the like.}

On the other hand, since the electrical conductivity of the first active material layer 102 and the second active material layer 112 is generally lower than the electrical conductivity of the first electrode current collector layer 101 and the second electrode current collector layer 111, For a uniform ion exchange reaction between the first active material layer 102 and the second active material layer 112, a first conductor layer 103 is formed on each of the first active material layer 102 and the second active material layer 112, respectively. and the second conductor layer 113 may be inserted. For example, the first conductor layer 103 is electrically connected to the first electrode current collector layer 101 , and may be inserted into the first active material layer 102 . Also, the second conductor layer 113 may be electrically connected to the second electrode current collector layer 111 , and may be inserted into the second active material layer 112 .

The first conductor layer 103 and the first electrode current collector layer 101 may be separately manufactured using different materials and then bonded to each other, or may be integrally formed using the same conductive material. Similarly, the second conductor layer 113 and the second electrode current collector layer 101 may be separately manufactured using different materials and then bonded to each other, but may also be integrally formed using the same conductive material. For example, the first electrode current collector layer 101 may be formed to have a plurality of flat plate-shaped first conductor layers 103 extending vertically protruding from the surface thereof, and the second electrode current collector layer 111 . ) may be formed to have a plurality of plate-shaped second conductor layers 113 extending vertically protruding from the surface thereof. 1 and 2, the first and second conductor layers 103 and 113 are illustrated as having a flat plate shape, but they are not necessarily completely flat plates. For example, the first and second conductor layers 103 and 113 may be formed in various shapes, such as a fishbone shape, a mesh shape, or a lattice shape.

Since the first conductor layer 103 in the form of a flat plate is inserted into each first active material layer 102 , both surfaces of the first conductor layer 103 may be in contact with the first active material layer 102 . . Similarly, since the second conductor layer 113 is inserted into each second active material layer 112 , both surfaces of the second conductor layer 113 may be in contact with the second active material layer 112 . The first and second conductor layers 103 and 113 may extend from the first and second electrode current collector layers 101 and 111 to contact the electrolyte layer 120 , respectively. That is, the first ends of the first and second conductor layers 103 and 113 may contact the first and second electrode current collector layers 101 and 111 , respectively, and the second ends may contact the electrolyte layer 120 . have. Then, the first and second conductor layers 103 and 113 may completely separate the first and second active material layers 102 and 112 , respectively. For example, the first active material layer 102 may be divided into two parts 102a and 102b by the first conductor layer 103 , and the second active material layer 112 is formed by the second conductor layer 113 . It may be divided into two parts 112a and 112b.

As described above, since the first and second conductor layers 103 and 113 are inserted into the first and second active material layers 102 and 112 , the first and second active material layers adjacent to the electrolyte layer 120 . Electrons may be easily transferred from the ends of the electrodes 102 and 112 to the first and second electrode current collector layers 101 and 111, respectively. For example, in the absence of the first conductor layer 103 , the end of the first active material layer 102 adjacent to the electrolyte layer 120 has a distance from the first electrode current collector layer 101 compared to the other portions. Since the distance is far, electrons may be difficult to transfer from the end of the first active material layer 102 to the first electrode current collector layer 101 . For this reason, when the length of the first active material layer 102 is increased, the end region of the first active material layer 102 may hardly be utilized. However, by using the first and second conductor layers 103 and 113, the first and second active material layers 102, adjacent to the electrolyte layer 120 from the first and second electrode current collector layers 101 and 111, 112) can facilitate the movement of electrons to the end. Therefore, since metal ions can be exchanged uniformly throughout the electrolyte layer 120 between the first active material layer 102 and the second active material layer 112 , the first and second active material layers 102 and 112 , It may be possible to configure the length to be sufficiently long.

1 and 2 show that the first and second conductor layers 103 and 113 are disposed on all of the first and second active material layers 102 and 112, respectively, but this is only an example, and Examples are not limited thereto. That is, the first and second conductor layers 103 and 113 may be selectively disposed on only some of the plurality of first and second active material layers 102 and 112 . For example, one first and second conductor layers 103 and 113 may be respectively inserted into each of the two first and second active material layers 102 .

In addition, although it is illustrated that the first and second electrode current collector layers 101 and 111 have a complete flat plate shape and the secondary battery 100 has a perfect rectangular shape in FIGS. 1 and 2 , the present invention is not limited thereto. For example, FIG. 3 is a cross-sectional view schematically illustrating a structure of a unit cell of a secondary battery 100 ′ according to another exemplary embodiment. As shown in FIG. 3 , the secondary battery 100 ′ may have a curved rectangular shape. In this case, the first and second electrode current collector layers 101 and 111 may have a curved plate shape having a curvature and may be parallel to each other. The curved secondary battery 100 ′ may be applied to various electronic devices manufactured to have a curved shape.

According to the present embodiment described above, a plurality of independent parallel first and second active material layers 102 and 112 are formed between the first and second electrode current collector layers 101 and 111 that are parallel to each other. Since the two-electrode current collector layers 101 and 111 are alternately arranged perpendicular to the surface, the energy density and rate characteristics of the secondary battery 100 can be simultaneously improved. For example, if the height h of the unit cell of the secondary battery 100 is increased by increasing the heights of the first and second active material layers 102 and 112 , the reaction area increases in proportion to the height, so the rate characteristics This can be improved. In addition, when the height h of the unit cell of the secondary battery 100 is increased, the fraction occupied by the first and second active material layers 102 and 112 in the secondary battery 100 increases, so that the secondary battery ( 100) can also be improved. Accordingly, it is possible to increase the use time of the secondary battery 100 and increase the charging rate at the same time. In addition, since the solid electrolyte is used, the secondary battery 100 according to the present embodiment can be expected to have high battery stability. Since the unit cell of the secondary battery 100 can be manufactured with a small size, it may be suitable for a battery of a small device such as a mobile device or a wearable device.

For example, FIG. 4 is a perspective view schematically showing the configuration of the secondary battery 10 according to the comparative example, and FIGS. 5 and 6 are the characteristics of the secondary battery 100 according to the present embodiment described above in FIG. 4 . It is a graph shown in comparison with the comparative example. Specifically, FIG. 5 shows a comparison between the secondary battery 100 shown in FIG. 1 and the secondary battery 10 according to the comparative example shown in FIG. 4 with respect to the relationship between the height of the unit cell and the reaction area, and FIG. 6 shows a comparison between the secondary battery 100 shown in FIG. 1 and the secondary battery 10 according to the comparative example shown in FIG. 4 with respect to the relationship between the height of the unit cell and the active material fraction.

First, referring to FIG. 4 , the secondary battery 10 according to the comparative example has a first electrode current collector layer 11, a first active material layer 13, a separator 20, and a second active material layer ( 14), and a second electrode current collector layer 12 . As shown in FIG. 4 , the first electrode current collector layer 11 , the first active material layer 13 , the separator 20 , the second active material layer 14 , and the second electrode current collector layer 12 . are all arranged parallel to each other. In addition, it is assumed that the secondary battery 10 according to the comparative example uses a liquid electrolyte.

The graphs of FIGS. 5 and 6 were obtained while changing the height assuming that the length and width of the secondary battery 100 according to the present embodiment and the secondary battery 10 according to the comparative example are the same as 294 um and 200 um, respectively. . In addition, in the secondary battery 100 according to the present embodiment, the thickness of the first and second active material layers 102 and 112 was assumed to be 20 um, and the thickness of the electrolyte layer 120 was assumed to be 1 um. In the battery 10 , the thickness of the first and second active material layers 13 and 14 was assumed to be 50 um, and the thickness of the separator 20 was assumed to be 20 um. In addition, in the secondary battery 100 according to the present embodiment and the secondary battery 10 according to the comparative example, the thicknesses of the first and second electrode current collector layers 101, 111; 11, 12 were all assumed to be 15 μm. . The size of the secondary battery 10 according to the above-described comparative example is based on the specifications of commercially available batteries.

As can be seen from the graph of FIG. 5 , the reaction area of the secondary battery 10 according to the comparative example is maintained constant even when the height of the unit cell is increased. On the other hand, the reaction area of the secondary battery 100 according to the present embodiment may increase linearly in proportion to the height. In addition, referring to the graph of FIG. 6 , in both the secondary battery 10 according to the comparative example and the secondary battery 100 according to the present embodiment, as the height of the unit cell increases, the active material volume fraction increases, but overall, this embodiment It can be seen that the active material volume fraction of the secondary battery 100 according to the example is greater than the active material volume fraction of the secondary battery 10 according to the comparative example. For example, when the height of the unit cell is 150 um, the reaction area of the secondary battery 10 according to the comparative example is ^{about 58,800 um 2} and the active material volume fraction is 0.67, whereas the secondary battery 100 according to this embodiment The reaction area is ^{about 333,200 um 2} and the volume fraction of the active material is 0.76. Accordingly, it can be seen that the secondary battery 100 according to the present embodiment increases the reaction area by 5 times or more and the volume fraction of the active material by 13% or more, compared to the secondary battery 10 according to the comparative example.

7 is a perspective view schematically illustrating a structure of a unit cell of a secondary battery 200 according to another exemplary embodiment. In the embodiment shown in FIG. 1 , the first and second conductor layers 103 and 113 extend from the first and second electrode current collector layers 101 and 111 to the electrolyte layer 120 , respectively. ) is in contact with Accordingly, the first and second conductor layers 103 and 113 may completely separate the first and second active material layers 102 and 112 , respectively. However, as shown in FIG. 7 , the first and second conductor layers 103 and 113 extend close to the electrolyte layer 120 , but may not contact the electrolyte layer 120 . In this case, the two portions 102a and 102b of the first active material layer 102 in contact with both surfaces of the first conductor layer 103, respectively, are not completely divided and can be connected to each other in the region adjacent to the electrolyte layer 120. have. Similarly, the two portions 112a and 112b of the second active material layer 112 that are in contact with both surfaces of the second conductor layer 113, respectively, are not completely divided and may be connected to each other in a region adjacent to the electrolyte layer 120. . In FIG. 7 , both the first and second conductor layers 103 and 113 are illustrated as not in contact with the electrolyte layer 120 , but any one of the first conductor layer 103 and the second conductor layer 113 is The electrolyte layer 120 may be in contact with the other one may not be in contact with the electrolyte layer 120 .

8 is a perspective view schematically illustrating a structure of a unit cell of a secondary battery 300 according to another exemplary embodiment. Compared with the secondary battery 100 illustrated in FIG. 1 , the secondary battery 300 illustrated in FIG. 8 is different in that the second conductor layer 113 is omitted. The rest of the configuration of the secondary battery 300 shown in FIG. 8 may be the same as that of the secondary battery 100 shown in FIG. 1 . When the second active material layer 112 is made of an active material having sufficiently high electrical conductivity, the second electrode is formed from the end of the second active material layer 112 adjacent to the electrolyte layer 120 even without the second conductor layer 113 . Since electrons can be smoothly transferred to the current collector layer 111 , the second conductor layer 113 may be omitted. Although not shown in FIG. 8 , when the first active material layer 102 is made of an active material having sufficiently high electrical conductivity, the first conductor layer 103 may be omitted. Although the first conductor layer 103 is shown in contact with the electrolyte layer 120 in FIG. 8 , the first conductor layer 103 may not contact the electrolyte layer 120 according to an embodiment.

Also, FIGS. 9A and 9B are perspective and exploded perspective views schematically illustrating a structure of a unit cell of a secondary battery 400 according to still another exemplary embodiment. Compared with the secondary battery 100 illustrated in FIG. 1 , the secondary battery 400 illustrated in FIGS. 9A and 9B does not use the second electrode current collector layer and the second active material layer 114 is a second electrode collector. It is designed to serve as a whole layer. The rest of the configuration of the secondary battery 400 shown in FIGS. 9A and 9B may be the same as that of the secondary battery 100 shown in FIG. 1 .

When the second active material layer 114 is made of an active material having very good electrical conductivity, such as lithium (Li) metal, as shown in FIGS. 9A and 9B, the second active material layer 114 It can also serve as this electrode current collector layer. To this end, the second active material layer 114 faces in parallel with the plurality of first portions 114a and the first electrode current collector layer 101 that are alternately arranged in parallel with the plurality of first active material layers 102 . It may include a second portion 114b disposed to be. The second portion 114b of the second active material layer 114 serves as the second electrode current collector layer 111 shown in FIG. 1 and may have a flat plate shape. In addition, the plurality of first portions 114a may have a flat plate shape extending vertically from the second portion 114b. The plurality of first portions 114a and second portions 114b of the second active material layer 114 may be integrally formed of the same material. The electrolyte layer 120 is formed between a plurality of first active material layers 102 and a plurality of first portions 114a of the second active material layer 114, a plurality of first active material layers 102 and a second active material layer. It is disposed between the second portion 114b of the layer 114 and between the plurality of first portions 114a of the second active material layer 114 and the first electrode current collector layer 101, and is formed to be serpentine. can be

FIG. 10 is a perspective view exemplarily illustrating a stacked structure 500 formed by stacking a plurality of unit cells of the secondary battery 100 shown in FIG. 1 . Referring to FIG. 10 , when a plurality of unit cells of the secondary battery 100 are stacked, the plurality of unit cells of the secondary battery 100 may be arranged such that electrode current collectors 101 and 111 of the same type are in contact with each other. have. For example, the first electrode current collector 101 of the unit cell of one secondary battery 100 is in contact with the first electrode current collector 101 of the unit cell of the other secondary battery 100, and any one The second electrode current collector 111 of the unit cell of the secondary battery 100 may be in contact with the second electrode current collector 111 of the unit cell of the other secondary battery 100 . And a unit of a plurality of secondary batteries 100 stacked by connecting the first conductive wire 501 to the first electrode current collectors 101 and the second conductive wire 502 to the second electrode current collectors 111 . Cells may be electrically connected in parallel.

Up to now, in order to help the understanding of the present invention, exemplary embodiments of a secondary battery having improved energy density and rate characteristics have been described and shown in the accompanying drawings. However, it should be understood that these examples are merely illustrative of the present invention and not limiting thereof. And it is to be understood that the present invention is not limited to the description shown and described. This is because various other modifications may occur to those skilled in the art.

100, 200, 300, 400....Secondary battery 101.....First electrode current collector layer
102....First active material layer 103, 113...Conductor layer
111....Second electrode current collector layers 112, 114...Second active material layer
120....Electrolyte layer 500.....Laminate
501, 502.....lead wire

Claims (26)

a first electrode current collector layer and a second electrode current collector layer disposed to face each other;
a plurality of first active material layers in electrical contact with the first electrode current collector layer and disposed perpendicular to the first electrode current collector layer;
a plurality of second active material layers in electrical contact with the second electrode current collector layer and disposed perpendicular to the second electrode current collector layer;
The entire area between the plurality of first active material layers and the second active material layer, the entire area between the plurality of first active material layers and the second electrode current collector layer, and the plurality of second active material layers and the first electrode one single electrolyte layer extending in a tortuous shape along the entire area between the current collector layers; and
and a first conductor layer electrically in contact with the first electrode current collector layer and inserted into the plurality of first active material layers. The method of claim 1,
The first electrode current collector layer and the second electrode current collector layer have a flat plate shape disposed parallel to each other. The method of claim 1,
The first electrode current collector layer and the second electrode current collector layer have a curved plate shape having a curvature and are disposed parallel to each other. The method of claim 1,
The plurality of first active material layers are in contact with a first surface of the first electrode current collector layer, and the plurality of second active material layers are in contact with a second surface of the second electrode current collector layer, and the first surface and the first electrode current collector layer and the second electrode current collector layer are disposed so that the second surface faces each other. 5. The method of claim 4,
The plurality of first active material layers are disposed perpendicular to the first surface of the first electrode current collector layer, and the plurality of second active material layers are disposed perpendicular to the second surface of the second electrode current collector layer. built-in battery. 6. The method of claim 5,
The plurality of first active material layers and the plurality of second active material layers have a flat plate shape, and the plurality of first active material layers and the plurality of second active material layers are alternately arranged side by side. 6. The method of claim 5,
The first conductor layer has a flat plate shape extending vertically protruding from the first surface of the first electrode current collector layer. 8. The method of claim 7,
The first conductor layer is inserted into at least a part of the active material layer among the plurality of first active material layers, and both surfaces of the first conductor layer are disposed so as to be in contact with the first active material layer. 8. The method of claim 7,
A first end of the first conductor layer contacts a first surface of the first electrode current collector layer, and a second end of the first conductor layer opposite the first end contacts the electrolyte layer. 8. The method of claim 7,
a first end of the first conductor layer contacts a first surface of the first electrode current collector layer, a second end of the first conductor layer opposite the first end contacts the first active material layer; ,
two portions of the first active material layer, each in contact with both surfaces of the first conductor layer, are connected to each other at a second end of the first conductor layer. The method of claim 1,
The electrolyte layer is a battery comprising a solid electrolyte. delete The method of claim 1,
and a second conductor layer electrically in contact with the second electrode current collector layer and inserted into the plurality of second active material layers. 14. The method of claim 13,
The second conductor layer has a flat plate shape extending vertically protruding from the second electrode current collector layer. 15. The method of claim 14,
The second conductor layer is inserted into at least a portion of the active material layer among the plurality of second active material layers, and is disposed so that both surfaces of the second conductor layer are in contact with the second active material layer. 15. The method of claim 14,
A first end of the second conductor layer contacts the second electrode current collector layer, and a second end of the second conductor layer opposite the first end contacts the electrolyte layer. 15. The method of claim 14,
a first end of the second conductor layer contacts the second electrode current collector layer, and a second end of the second conductor layer opposite the first end contacts the second active material layer;
A battery in which two portions of the second active material layer each contacting both surfaces of the second conductor layer are connected to each other at a second end of the second conductor layer. The method of claim 1,
The first active material layer is a battery made of a positive electrode active material including a ceramic sintered body of the positive electrode composition. a first electrode current collector layer having a flat plate shape;
a plurality of first active material layers in electrical contact with the first electrode current collector layer and disposed perpendicular to the first electrode current collector layer;
a conductor layer electrically in contact with the first electrode current collector layer and inserted into the plurality of first active material layers;
a plurality of first portions alternately arranged in parallel with the plurality of first active material layers, and a second portion disposed to face in parallel with the first electrode current collector layer and extending from the plurality of first portions; a second active material layer; and
the entire area between the first plurality of first active material layers and the second plurality of active material layers, the total area between the first plurality of active material layers and the second portion of the second active material layer, and the second A battery comprising a; one single electrolyte layer extending in a tortuous shape along the entire area between the plurality of first portions of the active material layer and the first electrode current collector layer. 20. The method of claim 19,
A battery in which a plurality of first and second portions of the plurality of second active material layers are integrally formed. 20. The method of claim 19,
The conductive layer is inserted into at least a part of the active material layer among the plurality of first active material layers, and both surfaces of the conductive layer are disposed so as to be in contact with the first active material layer. 20. The method of claim 19,
The conductive layer has a flat plate shape extending vertically protruding from the first electrode current collector layer. 20. The method of claim 19,
A first end of the conductor layer contacts the first electrode current collector layer, and a second end of the conductor layer opposite the first end contacts the electrolyte layer. 20. The method of claim 19,
a first end of the conductor layer contacts the first electrode current collector layer, and a second end of the conductor layer opposite the first end contacts the first active material layer;
A battery in which two portions of the first active material layer each contacting both surfaces of the conductor layer are connected to each other at a second end of the conductor layer. 20. The method of claim 19,
The electrolyte layer is a battery comprising a solid electrolyte. delete

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