Mesh-structured lithium electrode and lithium secondary battery comprising same

Abstract

The present invention provides a mesh-type lithium electrode manufactured by forming a structure with a fiber bundle composed of a plurality of fibers and forming a conductive layer on the surface of the structure. The mesh-type lithium electrode uniformly disperses the distribution of an electric field applied during charging / discharging of a battery, and thus prevents the formation of dendrites and excess lithium in a negative electrode, made of lithium metal, during operation of the battery.

Description

Lithium electrode with mesh structure and lithium secondary battery including the same

[0001] The present invention relates to a lithium electrode having a mesh structure and a lithium secondary battery including the same.

[0002] Most existing lithium metal electrode technologies for lithium secondary batteries utilize lithium foil. However, lithium foil has several drawbacks: the uneven behavior of lithium ions during charge and discharge within the battery leads to uneven use of the lithium foil electrode, which gradually depletes lithium; lithium dendrites develop, physically damaging the separator; short circuits occur between the anode and cathode, rendering the battery unusable; and the risk of large amounts of heat generated in the event of a sudden, high-current short circuit, which can lead to fire or explosion.

[0003] Research has been conducted to physically inhibit dendrite formation on lithium foil electrodes by applying ceramic or polymer coatings. While these coatings are effective in suppressing dendrites immediately after application, they can be damaged during battery use, or dendrites can grow slowly until the coating's protective function is no longer effective, and then grow explosively, reproducing the aforementioned drawbacks.

[0004] As another means of suppressing lithium dendrites, a method of suppressing dendrites by additionally inserting a mesh made of Cu or SUS (stainless steel) has been studied, but there are disadvantages such as an increase in the overall thickness of the cell, an increase in the volume of the cell, a decrease in the energy density, and a significant increase in the cost of the battery.

[0005] The disadvantages of the lithium foil electrode as described above are aggravated as the electrode area increases, as high-rate charging and discharging continues, and as the distance between the positive and negative electrodes increases.

[0006] Meanwhile, the lithium foil market is not large, so large domestic companies are not entering the lithium foil manufacturing industry. In addition, small and medium-sized enterprises are not entering the industry because the manufacturing process is difficult, such as the need to maintain a thoroughly inert atmosphere from lithium refining to rolling.

[0007] Accordingly, the present invention aims to solve the aforementioned problems by elucidating the mechanism of dendrite formation in a lithium metal electrode from the distribution of the electric field. Specifically, the present invention aims to suppress dendrite formation by using a structure to microscopically induce and cancel out the electric field generated from the electrode and uniformly distribute the electric field macroscopically, thereby providing a method for forming a lithium electrode from a low-purity lithium source.

[0008] In order to solve the above problems, the present invention aims to provide a lithium electrode having a mesh structure and a lithium secondary battery including the same.

[0009] In order to solve the above problems, the present invention provides a lithium electrode including: a fiber bundle formed of a plurality of fibers; a structure having a mesh shape formed of the fiber bundles; a conductive layer formed on the structure; and a lithium layer formed on the conductive material.

[0010] In the lithium electrode, the number of openings, which are empty spaces between the fiber bundles constituting the structure, is 10 to 1000 / inch. 2 It may be formed with a density of .

[0011] The above fiber may be glass fiber.

[0012] The shape of the above opening may be circular or polygonal.

[0013] The above conductive layer may be formed of one or a mixture of two or more selected from a group of metal materials including magnesium (Mg), magnesium-calcium alloy (Mg-Ca alloy), copper (Cu), silver (Ag), tin (Sn), and stainless steel (SUS); or a group of carbon materials including carbon-based conductive materials, graphite, graphene, and carbon nanotubes (CNT).

[0014] The above conductive layer may be in a form that surrounds the above structure.

[0015] The above lithium layer may be in a form that surrounds the conductive layer.

[0016] The sum of the thicknesses of the conductive layer and the lithium layer may be 1 to 100 μm.

[0017] The present invention provides a method for manufacturing the lithium electrode. Specifically, the method may include the steps of: (A) forming a fiber bundle with a plurality of fibers; (B) forming a structure with the fiber bundle; (C) forming a conductive layer on the surface of the structure; and (D) forming a lithium layer on the surface of the conductive layer.

[0018] The lithium layer of the above step (D) may be electrochemically formed on the surface of the conductive layer.

[0019] In addition, the present invention provides a lithium secondary battery including the lithium electrode.

[0020] The above lithium secondary battery is LSPS (Li 10 SnP2S 12 ), LGPS(Li 10 GeP2S 12 ) and LPSCl (Li6PS5Cl).

[0021] The above lithium secondary battery may include a composite of the lithium electrode and a solid electrolyte.

[0022] The above lithium secondary battery is LCO (LiCoO2), NCM (LiNi x Co y Mn z O2, x+y+z=1), LFP (LiFePO4) and lithium polysulfide (Li2S x , 0 <x≤9) 중에서 선택되는 어느 하나를 양극으로써 포함하는 것일 수 있다.

[0023] The lithium electrode according to the present invention has the effect of improving the lifespan of the lithium electrode and, further, the lifespan of the battery by minimizing the distribution of the electric field generated during charging and discharging of a secondary battery through a mesh structure and uniformly controlling the uneven oxidation and reduction tendency of lithium between the center and corners of the electrode.

[0024] Figure 1 shows a simulation of the electric field formed when a lithium secondary battery is charged.

[0025] Figure 2 is a photograph of a structure formed in a manufacturing example of the present invention.

[0026] Figure 3 is a photograph of a conductive layer made of graphite formed on a structure.

[0027] Figure 4 is a photograph showing a conductive layer made of silver (Ag) formed on a structure.

[0028] Figure 5 is a photograph showing a conductive layer made of silver (Ag) formed on a structure.

[0029] Figure 6 is a photograph of the surface of a conductive layer made of silver (Ag), and a photograph of dendrites and excess lithium formed during the formation of a lithium layer in a beaker cell using the conductive layer as a working electrode.

[0030] Figure 7 is a photograph showing the manufacturing process of an embodiment provided by the present invention.

[0031] Figure 8 is a photograph taken of an embodiment provided by the present invention.

[0032] Figure 9 is a graph showing the results of measuring the specific capacity according to the C-rate of the battery.

[0033] Hereinafter, a lithium electrode according to the present invention and a lithium secondary battery including the same will be described in detail. The drawings introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Therefore, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be illustrated in an exaggerated manner to clarify the spirit of the present invention. At this time, unless otherwise defined, the technical and scientific terms used in the present invention have the meaning commonly understood by a person of ordinary skill in the art to which this invention pertains, and a description of well-known functions and configurations that may unnecessarily obscure the gist of the present invention in the following description and the accompanying drawings will be omitted.

[0034]

[0035] In order to solve the above problems, the present invention provides a lithium electrode including: a fiber bundle formed of a plurality of fibers; a structure having a mesh shape formed of the fiber bundles; a conductive layer formed on the structure; and a lithium layer formed on the conductive material.

[0036] In the lithium electrode, the number of openings, which are empty spaces between the fiber bundles constituting the structure, is 10 to 1,000 / inch. 2 It may be formed with a density of . By configuring the above structure in a mesh form, the electric field generated along the surface of one fiber bundle microscopically is offset from the electric field generated along the surface of another intersecting fiber bundle, so that the distribution of the electric field generated from the lithium electrode from a macroscopic perspective can become uniform.

[0037] The fibers above may be glass fibers. Glass fibers are a material with excellent insulation and chemical resistance, and as they are non-conductors, they do not participate in electrochemical reactions within a lithium secondary battery. They are also lightweight and strong, so there is a low probability of side reactions or structural deformation due to external forces within the battery. The glass fibers above are commonly used chemical fibers, and may be any one selected from Type A (alkali-resistant), Type C (chemical-resistant), Type E (for electrical components), and Type S (for high strength), which are classified according to the raw material composition.

[0038] More specifically, in the present invention, since there is a high possibility that the glass fiber will be directly exposed to various chemicals such as acids, bases, and organic electrolytes, it is preferable to use C-type glass fiber with excellent chemical resistance.

[0039] The above glass fiber may be produced by drawing out a raw material melted at high temperature into a filament having a diameter of 3 to 20 ㎛, surface-treating the filament with a binder or the like, and gathering it into 50 to 2,000 strands to produce a strand.

[0040] In the present invention, the fiber may be directly used as the strand, or a yarn wound with twist applied to the strand, or a roving wound without twist applied. In this case, it is preferable to use a roving that is advantageous for molding due to its lack of twist and has excellent mechanical strength.

[0041] The above fiber bundle is a collection of fibers aligned in a certain direction, and one fiber bundle may be composed of 10 to 1,000 fibers. By weaving multiple fibers into a fiber bundle in this way to form a structure, even if the shape of the structure is deformed by an external force, damage does not occur, and thus the physical durability of the structure can be greatly increased.

[0042] The shape of the above opening may be circular or polygonal. If the opening is circular or a polygon larger than a pentagon, it has the advantage of achieving a more uniform distribution of the microscopic electric field. However, this poses the problem of difficulty in manufacturing the structure, which increases costs and reduces productivity. Therefore, it is desirable to have a triangular or square opening that allows for controlled distribution of the electric field while maintaining reasonable costs and high productivity.

[0043] In addition, the present invention may provide a form in which the outer surface of the fiber bundle is wrapped with silver nanowires or a form in which silver nanowires are coated. Since the fiber bundle is composed of non-conductive glass fibers, it may be difficult to coat the surface with a conductive layer. Therefore, a method of coating the conductive layer with only silver nanowires may be used, and when the conductive layer is composed of silver (Ag), there is an advantage in that the conductive layer can be formed more easily and uniformly by using silver nanowires as a nucleation medium for silver (Ag) particles. The diameter and length of the silver nanowires are not particularly limited, but, for example, the average diameter may be 20 to 100 nm, and the average length may be 1 to 500 μm.

[0044] The above conductive layer may be formed of one or a mixture of two or more selected from a group of metal materials including silver (Ag), tin (Sn), copper (Cu), silicon (Si), aluminum (Al), germanium (Ge), lead (Pb), bismuth (Bi), antimony (Sb), silicon alloy (Si-Y), and stainless steel (SUS); or a group of carbon materials including carbon-based conductive materials, graphite, graphene, and carbon nanotubes (CNT). At this time, Y constituting the silicon alloy (Si-Y) is at least one selected from the group consisting of alkali metals, alkaline earth metals, group 13 elements, group 14 elements, transition metals and rare earth elements other than silicon (Si), and specific examples include magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), radium (Ra), scandium (Sc), yttrium (Y), titanium (Ti), zirconium (Zr), hafnium (Hf), rutherfordium (Rf), vanadium (V), niobium (Nb), tantalum (Ta), dubnium (Db), chromium (Cr), molybdenum (Mo), tungsten (W), seaborgium (Sg), technetium (Tc), rhenium (Re), bohrium (Bh), iron (Fe), lead (Pb), ruthenium (Ru), osmium (Os), hassium (Hs), rhodium (Rh), iridium (Ir), It may be at least one selected from palladium (Pd), platinum (Pt), copper (Cu), silver (Ag), gold (Au), zinc (Zn), cadmium (Cd), boron (B), aluminum (Al), gallium (Ga), tin (Sn), indium (In), germanium (Ge), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi), sulfur (S), selenium (Se), or tellurium (Te).

[0045] When the conductive layer is selected from the group of metal materials, the electron conductivity is excellent, the overpotential required for lithium nucleation is low, and the resistance is small, so that the electrochemical formation of the lithium layer progresses uniformly and quickly during the manufacturing process of the lithium electrode. In particular, when silver (Ag), silicon (Si), tin (Sn), aluminum (Al), germanium (Ge), lead (Pb), bismuth (Bi), antimony (Sb), or silicon alloy (Si-Y) is used, lithium is not precipitated on the surface, and a certain amount of alloy is formed with lithium, so that the lithium capacity can be greatly increased. However, the group of metal materials has a narrow electrochemical window, so that when the conductive layer is directly exposed to the electrolyte in the future in the battery, metal cations may be generated, which may adversely affect the capacity and life characteristics of the battery. Therefore, when using the above group of metal materials as a conductive layer, it is necessary to control the material so that it can completely wrap the surface of the structure, and it is most desirable to uniformly form the conductive layer while preventing it from being dispersed by wrapping the fiber bundle using nanowires, etc.

[0046] In addition, when the conductive layer is selected from the group of carbon materials, the electron conductivity is lower than that of metals, the overpotential required for nucleation is higher, and the resistance is high, so the electrochemical deposition of lithium may proceed somewhat slowly. However, the group of carbon materials has a high specific surface area, and carbon combined with lithium (such as LiC6) has superior stability compared to lithium metal, which can have a positive effect on the capacity and life characteristics of the battery.

[0047] The conductive layer may be in a form that surrounds the structure. Preferably, the conductive layer surrounds the structure with a uniform thickness. If the conductive layer is not formed evenly on the surface of the structure, particularly if the conductive layer is formed so roughly that the surface of the structure is exposed, the electronic conductivity of the structure is very low, making lithium deposition impossible, and lithium is unevenly deposited only in the portion where the conductive layer is formed, so that excess lithium that does not participate in charge / discharge at all and reduces the active area of ​​the electrode may be promoted. Therefore, in order to preferably achieve the present invention, it is essential that the conductive layer is formed to completely cover the surface of the structure.

[0048] In addition, the present invention may further include a separate layer between the conductive layer and the lithium layer. Such a layer is intended to increase the contact force between the conductive layer and the lithium layer or reduce the interfacial resistance, and may be composed of carbon fiber, carbon foam, metal foam, metal wire, or metal foil. In this case, the metal constituting the layer may be at least one selected from silver (Ag), gold (Au), copper (Cu), calcium (Ca), zinc (Zn), aluminum (Al), tin (Sn), and nickel (Ni).

[0049] The lithium layer may be in a form that surrounds the conductive layer. The lithium layer is electrochemically deposited on the conductive layer and can perform the same role as a lithium metal electrode commonly used for storing and releasing lithium.

[0050] The sum of the thicknesses of the conductive layer and the lithium layer may be 5 to 120 μm.

[0051] The conductive layer serves as an electrode, a mediator, and a catalyst when forming a lithium layer, and also serves as a current collector in the electrode. There is no particular limitation on its thickness, but it may be, for example, 1 to 20 μm. In addition to serving as a mediator for lithium layer formation as described above, the conductive layer also serves as a current collector provided in a typical lithium secondary battery electrode. If the thickness of the conductive layer is less than 1 μm, it may not sufficiently cover the surface of the structure, which may promote the generation of excess lithium as described above. In addition, if the thickness of the conductive layer exceeds 20 μm, the thickness of the conductive layer and the lithium layer must be adjusted in order to control the distribution of the electric field, so the thickness of the lithium layer is relatively reduced, which may reduce the lithium storage capacity of the electrode. Therefore, in order to optimize the convenience of forming the lithium layer and the lithium storage capacity of the electrode, it is preferable that the conductive layer be formed on the structure with a thickness of 1 to 10 μm.

[0052] The lithium layer above serves as an anode active material that stores and releases lithium when the battery is charged and discharged. As the lithium layer is formed thickly on the conductive layer, the depletion of the lithium source within the battery can be prevented, and the surface area where lithium is exposed to the electrolyte can be increased, so that the power density and energy density of the battery can be improved. However, if the lithium layer is formed excessively thickly, for example, if it is formed with a thickness of 100 μm or more, it may be difficult to maintain a uniform distribution of the electric field in the part where the fiber bundles are overlapped in different directions (the intersection of the fiber bundles in the mesh form), which is not preferable. In addition, as the charging and discharging of the lithium secondary battery progresses, excess lithium may be formed, and the lithium source may be depleted. If the thickness of the lithium layer is less than 5 μm, it is difficult to fill this depletion, so that the lifespan of the battery may be reduced. In addition, the surface area where lithium is exposed to the electrolyte may be reduced, so that the power density and energy density of the battery may be lowered. Therefore, the thickness of the lithium layer is preferably 5 to 100 μm, and preferably 10 to 50 μm.

[0053] The present invention provides a method for manufacturing the lithium electrode. Specifically, the method may include the steps of: (A) forming a fiber bundle with a plurality of fibers; (B) forming a structure with the fiber bundle; (C) forming a conductive layer on the surface of the structure; and (D) forming a lithium layer on the surface of the conductive layer.

[0054] In the above step (C), the method of forming the conductive layer is not particularly limited, and for example, a printing method such as deep coating using metal ink, paste, etc., screen printing, inkjet printing, roll printing, etc., a plating method using an electrolytic or electroless method, thermal deposition, physical vapor deposition, sputtering, spin coating, etc. can be used.

[0055] The lithium layer of the above step (D) may be formed electrochemically on the surface of the conductive layer. For example, the lithium layer may be configured such that a structure having the conductive layer formed on the surface thereof serves as a working electrode, and scrap made of lithium metal, lithium carbonate (Li2CO3), lithium hydroxide (LiOH), lithium scrap, or black powder separated from a used secondary battery and crushed serves as a counter electrode. Next, lithium ions may be extracted and controlled from the counter electrode to move onto the structure having the conductive layer formed thereon, and then lithium ions may be reduced on the conductive layer of the structure to form a lithium layer.

[0056] Furthermore, the lithium electrode of the present invention can be provided in a composite form with a lithium metal electrode, a silicon electrode, a graphite-silicon composite electrode, etc. conventionally used in the art. As described above, the lithium electrode of the present invention forms a mesh structure, thereby having the effect of uniformly inducing the distribution of an electric field from a macroscopic perspective, and thus can be used with electrodes in which uniform reduction and deposition of lithium were difficult in the past to enhance stability. In addition, the lithium electrode can significantly improve the performance of a lithium secondary battery by simultaneously performing the role of an electrode that directly stores or releases lithium ions in addition to the auxiliary aspect of enhancing the stability of the electrode as described above.

[0057] In addition, the present invention provides a lithium secondary battery including the lithium electrode.

[0058] The above lithium secondary battery is LSPS (Li 10 SnP2S 12 ), LGPS(Li 10 GeP2S 12 ) and LPSCl (Li6PS5Cl).

[0059] The above lithium secondary battery may include a composite of the lithium electrode and a solid electrolyte. Here, the composite refers to a form in which the lithium electrode is surrounded by a solid electrolyte. In the case of a conventional lithium secondary battery using a solid electrolyte, the solid electrolyte is positioned between the positive and negative electrodes, resulting in a gap between the solid and solid interfaces, which makes it difficult to transfer lithium ions and has limitations such as very high interfacial resistance. However, by composited in this way, the contactability of the interface is improved, and the performance of the battery can be greatly improved.

[0060] The above lithium secondary battery is LCO (LiCoO2), NCM (LiNi x Co y Mn zO2, x+y+z=1), LFP (LiFePO4) and lithium polysulfide (Li2S x , 0 <x≤9) 중에서 선택되는 어느 하나를 양극으로써 포함하는 것일 수 있다.

[0061]

[0062] Hereinafter, a lithium electrode having a mesh structure according to the present invention and a lithium secondary battery including the same will be described in more detail through examples. However, the following examples are merely references for explaining the present invention in detail and are not intended to limit the present invention, and the present invention may be implemented in various forms.

[0063] Additionally, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is solely for the purpose of effectively describing specific embodiments and is not intended to limit the invention. Furthermore, the unit of additives not specifically described in the specification may be weight percent.

[0064]

[0065] [Manufacturing example]

[0066] The structure shown in Fig. 1 was formed by forming fiber bundles using glass fibers and weaving the fiber bundles to cross each other to form a mesh structure.

[0067] [Example 1]

[0068] A conductive layer was formed using graphite on the surface of the manufacturing example, and this was used as a working electrode. A cell was configured with a lithium metal counter electrode, and a lithium layer was formed on the surface of the working electrode.

[0069] [Example 2]

[0070] The surface of the manufacturing example was coated with silver nanowires (Ag nanowires, AgNW), and a conductive layer of silver (Ag) was formed on the surface to serve as a working electrode, and a black powder separated from a lithium secondary battery was used as a counter electrode to form a lithium layer on the surface of the working electrode.

[0071] [Example 3]

[0072] All processes were performed in the same manner as in Example 1, except that a conductive layer of silver (Ag) was deposited on the surface of the manufacturing example.

[0073] A photograph of a structure manufactured according to the present invention can be seen in Fig. 1. The structure is composed of glass fiber and exhibits insulating properties with no electrical or electronic conductivity.

[0074] In Fig. 2, a photo of a conductive layer formed with graphite on the structure can be seen.

[0075] In Fig. 3, a photograph showing the formation of a silver (Ag) conductive layer of Example 2 can be seen.

[0076] In Fig. 4, a photograph of the silver (Ag) conductive layer formed in Example 3 can be confirmed.

[0077] In this way, a lithium electrode characterized by a mesh-like structure and imparting electrical and electronic conductivity can be manufactured only by forming a conductive layer with materials such as graphite or silver (Ag) on ​​the surface of the structure. However, if the conductive layer is excessively coated, the conductivity may be relatively excellent, but the uneven formation of the coating may lead to problems such as dendrite formation in the long term.

[0078] In Fig. 5, it can be seen that a large amount of dendrites and excess lithium are generated during the formation of a lithium layer within a beaker cell, and that these are scraped and precipitated. As described above, the lithium scraped and precipitated in this way can be recycled as a counter electrode when manufacturing the lithium electrode of the present invention.

[0079] The manufacturing process of Example 2 can be confirmed in Fig. 6. It can be confirmed that lithium seeds are formed and gradually grow on the silver nanowire conductive layer, and it can also be confirmed that dendrites are not formed during the formation of the lithium layer.

[0080] In Fig. 7, an enlarged photograph of Example 2 in which the lithium layer is completely formed can be seen.

[0081] [Example 4]

[0082] A CR2032 half-cell was manufactured using a negative electrode made of a negative electrode material mixed with silicon particles having an average particle size of 50 nm and graphite particles having an average particle size of 13 μm, and Example 2 as a working electrode. 1.0 M LiPF6in EC / DMC (1:1, volume ratio) was used as the electrolyte, a polypropylene separator was used as the separator, and lithium foil was used as the counter electrode.

[0083] [Comparative example]

[0084] A CR2032 half-cell was manufactured using only a negative electrode made of a negative electrode material mixed with silicon particles having an average particle diameter of 50 nm and graphite particles having an average particle diameter of 13 μm as a working electrode.

[0085] In Fig. 8, the C-rate (current density 0.1 to 1.6 A g) of Example 4 and Comparative Example -1 ) can be checked according to the initial capacity. The initial capacity is approximately 1400~1600mAh g -1 , and the specific capacity according to subsequent C-rate changes was also similar.

[0086] That is, since Example 4 has a specific capacity that is almost similar to that of the comparative example even though the lithium electrode according to the present invention was added, it can be confirmed that the lithium electrode has a specific capacity similar to that of an electrode composed of silicon particles and graphite particles, and further, as a structure, does not adversely affect the oxidation / reduction reaction of lithium ions.

[0087]

[0088] Although the present invention has been described through specific matters and limited examples as described above, these are provided only to help with the overall understanding of the present invention, and the present invention is not limited to the above examples, and those skilled in the art to which the present invention pertains can make various modifications and variations based on this description.

[0089] Therefore, the idea of ​​the present invention should not be limited to the described embodiments, and all things that are equivalent or equivalent to the following claims as well as the claims are considered to fall within the scope of the idea of ​​the present invention.

Claims

1. A bundle of fibers composed of multiple fibers; A structure having a mesh shape made of the above fiber bundles; A conductive layer formed on the above structure; and A lithium layer formed on the conductive material; A lithium electrode comprising: The number of openings, which are empty spaces between the fiber bundles forming the above structure, is 10 to 1000 / inch. 2 A lithium electrode formed with a density of .

2. In paragraph 1, A lithium electrode characterized in that the fiber is glass fiber.

3. In paragraph 1, A lithium electrode characterized in that the shape of the above opening is circular or polygonal.

4. In paragraph 1, A lithium electrode characterized in that the conductive layer is made of one or a mixture of two or more selected from a group of metal materials including silver (Ag), tin (Sn), copper (Cu), and stainless steel (SUS); or a group of carbon materials including carbon-based conductive materials, graphite, graphene, and carbon nanotubes (CNT).

5. In paragraph 1, A lithium electrode characterized in that the conductive layer is in a form that surrounds the structure.

6. In paragraph 1, A lithium electrode characterized in that the lithium layer surrounds the conductive layer.

7. In paragraph 1, A lithium electrode characterized in that the sum of the thicknesses of the conductive layer and the lithium layer is 5 to 120 μm.

8. A method for manufacturing a lithium electrode according to any one of claims 1 to 7, (A) a step of forming a fiber bundle with a plurality of fibers; (B) a step of forming a structure with the above fiber bundles; (C) a step of forming a conductive layer on the surface of the structure; and (D) A method for manufacturing a lithium electrode, characterized by including a step of forming a lithium layer on the surface of the conductive layer.

9. In paragraph 8, A method for manufacturing a lithium electrode, characterized in that the lithium layer of the step (D) is electrochemically formed on the surface of the conductive layer.

10. A lithium secondary battery comprising a lithium electrode according to any one of claims 1 to 7.

11. In paragraph 10, The above lithium secondary battery is LSPS (Li 10 SnP 2 S 12 ), LGPS(Li 10 GeP2S 12 ) and LPSCl(Li 6 PS 5 A lithium secondary battery characterized by including at least one solid electrolyte selected from Cl).

12. In paragraph 10, A lithium secondary battery characterized in that the above lithium secondary battery includes a composite of the lithium electrode and a solid electrolyte.

13. In paragraph 10, The above lithium secondary battery is LCO (LiCoO 2 ), NCM(LiNi x Co y Mn z O 2 , x+y+z=1), LFP(LiFePO 4 ) and lithium polysulfide (Li 2 S x , 0 <x≤9) 중에서 선택되는 어느 하나를 양극으로써 포함하는 것을 특징으로 하는 리튬 이차전지.

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