KR-20260064636-A - Anode for Lithium-Ion Battery, method for manufacturing the same, and Lithium-Ion Battery including the same

KR20260064636AKR 20260064636 AKR20260064636 AKR 20260064636AKR-20260064636-A

Abstract

A method for manufacturing a cathode according to the present invention may include the steps of: preparing a cathode current collector; preparing a first source comprising a mechanical complement material, a second source comprising a lithium-affinity material having a relatively high affinity for lithium, and a third source comprising a lithium-protective material having a relatively low affinity for lithium; providing the cathode current collector to the first source and performing electrophoresis to manufacture a base cathode having a mechanical complement layer formed thereon; providing the base cathode to the second source and performing electrophoresis to manufacture a preliminary cathode having a lithium-affinity layer formed thereon on the mechanical complement layer; and providing the preliminary cathode to the third source and performing electrophoresis to manufacture a cathode having a lithium-protective layer formed thereon on the lithium-affinity layer.

Inventors

정형모
권순형
김동형
심우형
홍승종

Assignees

성균관대학교산학협력단

Dates

Publication Date: 20260507
Application Date: 20251031
Priority Date: 20241031

Claims (17)

Step of preparing the cathode current collector; A step of preparing a first source comprising a mechanical complement material, a second source comprising a lithium-affinity material having a relatively high affinity for lithium, and a third source comprising a lithium-protective material having a relatively low affinity for lithium; A step of providing the cathode current collector to the first source and performing electrophoresis to produce a base cathode having a mechanically reinforced layer formed thereon; A step of providing a base cathode to the second source and performing electrophoresis to produce a preliminary cathode in which a lithium affinity layer is formed on the mechanical complement layer; and A method for manufacturing a cathode comprising the step of providing the preliminary cathode to the third source and performing electrophoresis to manufacture a cathode having a lithium protective layer formed on the lithium affinity layer.
In Article 1, In the step of manufacturing the above base cathode, The above-mentioned negative current collector includes performing the role of a working electrode, and After the negative current collector and the counter electrode are supported in the first source such that they are spaced apart from each other, a voltage is applied between the negative current collector and the counter electrode to form an electric field. A method for manufacturing a cathode comprising, by means of the above electric field, regularly arranging the mechanical complement material of the first source on the surface of the cathode current collector to form the mechanical complement layer.
In Article 1, In the step of manufacturing the above-mentioned preliminary cathode, The above base cathode includes performing the role of a working electrode, and After the base cathode and the counter electrode are supported in the second source such that they are spaced apart from each other, a voltage is applied between the base cathode and the counter electrode to form an electric field. A method for manufacturing a cathode, comprising arranging the lithium-affinity material of the second source regularly on the surface of the lithium-affinity layer of the base cathode by the electric field to form the lithium-affinity layer.
In Article 1, In the step of manufacturing the above cathode, The above-mentioned preliminary cathode includes performing the role of a working electrode, and After the preliminary cathode and the counter electrode are supported in the third source such that they are spaced apart from each other, a voltage is applied between the preliminary cathode and the counter electrode to form an electric field. A method for manufacturing a cathode, comprising forming the lithium protective layer of the third source on the surface of the lithium affinity layer of the preliminary cathode by the electric field.
In Paragraph 4, A method for manufacturing a cathode comprising controlling the level of lithium ion passage according to the thickness of the lithium protective layer.
In Article 1, In the electrophoretic process of the step of manufacturing the base cathode, the step of manufacturing the preliminary cathode, and the step of manufacturing the cathode, The applied voltage magnitude is controlled to be between 5V and 150V, and A method for manufacturing a cathode, comprising controlling the voltage application time to be 30 seconds or more and 10 minutes or less.
In Article 1, A method for manufacturing a cathode, wherein the first source, the second source, and the third source each further comprise a solvent and an additive.
In Article 7, The mechanical complementary material of the first source comprises at least one of carbon nanotubes (CNT), graphene, or carbon black. The solvent of the first source comprises at least one of ethanol, isopropyl alcohol, acetone, or dimethylformamide (DMF), and A method for manufacturing a cathode, wherein the additive of the first source comprises at least one of iodine ( I₂ ), sodium hydroxide (NaOH), or magnesium nitrate (Mg( NO₃ ) ₂ ).
In Article 7, The lithium-affinity material of the second source comprises at least one of indium oxide ( In₂O₃ ), silver oxide ( Ag₂O ), magnesium nitride ( Mg₃N₂ ), aluminum nitride ( AlN ), or lithium nitride ( Li₃N ). The solvent of the second source comprises at least one of ethanol, isopropyl alcohol, acetone, or dimethylformamide (DMF), and A method for manufacturing a cathode, wherein the additive of the second source comprises at least one of iodine ( I₂ ), sodium hydroxide (NaOH), or magnesium nitrate (Mg( NO₃ ) ₂ ).
In Article 7, The lithium protective material of the third source comprises at least one of aluminum oxide ( Al₂O₃ ), titanium dioxide ( TiO₂ ), nickel oxide (NiO), polyethylene oxide (PEO), or poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The solvent of the third source comprises at least one of ethanol, isopropyl alcohol, acetone, or dimethylformamide (DMF), and A method for manufacturing a cathode, wherein the additive of the third source comprises at least one of iodine ( I₂ ), sodium hydroxide (NaOH), or magnesium nitrate (Mg( NO₃ ) ₂ ).
In Article 1, A method for manufacturing a cathode, wherein the above-mentioned cathode current collector comprises a lithium foil.
In a cathode in which a mechanical reinforcement layer, a lithium affinity layer, and a lithium protection layer are sequentially formed on a cathode current collector by electrophoresis, A cathode comprising improved interfacial stability between each layer compared to a reference cathode formed by a reference process of sequentially directly coating a first source containing a mechanical complementary material, a second source containing a lithium affinity material, and a third source containing a lithium protection material onto the above-mentioned cathode current collector to form a mechanical complementary layer, a lithium affinity layer, and a lithium protection layer.
Cathode current collector; A mechanical reinforcement layer on the above-mentioned cathode current collector; A lithium affinity layer having a relatively high lithium affinity on the mechanical complement layer above; and A cathode comprising a lithium protective layer having a relatively low lithium affinity on the lithium affinity layer.
In Article 13, The above mechanical reinforcement layer includes the function of improving the mechanical strength, flexibility, and conductivity of the cathode, and The lithium affinity layer comprises the function of generating lithium nuclei in a uniform distribution at the same positional level, and The above lithium protective layer includes a function that blocks direct contact between the negative electrode current collector and the electrolyte and selectively transmits lithium ions into the electrolyte.
In Article 14, The above mechanical reinforcement layer comprises a plurality of mechanical reinforcement materials arranged regularly and uniformly to cover the surface of the cathode current collector, and The lithium affinity layer comprises a plurality of lithium affinity materials regularly and uniformly arranged to cover the surface of the mechanical reinforcement layer, and The above lithium protective layer comprises a plurality of lithium protective materials regularly and uniformly arranged to cover the surface of the lithium affinity layer, a cathode.
In Article 15, The above mechanical complementary material comprises at least one of carbon nanotubes (CNT), graphene, or carbon black, and The above lithium - affinity material comprises at least one of indium oxide ( In₂O₃ ), silver oxide ( Ag₂O ), magnesium nitride ( Mg₃N₂ ), aluminum nitride (AlN), or lithium nitride ( Li₃N ). The above lithium protective material comprises at least one of aluminum oxide ( Al₂O₃ ), titanium dioxide ( TiO₂ ), nickel oxide (NiO), polyethylene oxide (Poly(ethylene oxide), PEO), or poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), PEDOT:PSS, and is a cathode.
cathode according to claim 13; An anode having an anode layer spaced apart from the above-mentioned cathode; and A lithium-ion battery comprising a solid electrolyte disposed between the above-mentioned cathode and the above-mentioned anode.

Description

Anode for Lithium-Ion Battery, method for manufacturing the same, and Lithium-Ion Battery including the same The present invention relates to a negative electrode for a lithium-ion battery, a method for manufacturing the same, and a lithium-ion battery including the same, more specifically, a negative electrode in which a mechanical reinforcement layer, a lithium affinity layer, and a lithium protection layer are sequentially laminated on a negative electrode current collector by electrophoresis, a method for manufacturing the same, and a lithium-ion battery including the same. With the recent rapid growth of the electric vehicle industry, there is an urgent need for the development of next-generation rechargeable batteries that possess high energy density while having a low risk of fire and explosion. Currently commercialized lithium-ion batteries use highly flammable liquid electrolytes, posing a significant risk of explosion and fire in the event of an accident. To compensate for this, multiple safety devices are required when configuring battery modules and packs, which limits overall energy density. Accordingly, all-solid-state batteries using non-flammable solid electrolytes are gaining attention as a next-generation battery technology. They offer advantages such as a low risk of fire and explosion, the ability to reduce safety devices during module and pack design, and the realization of high energy density. Among these, sulfide-based solid electrolytes are attracting particular interest as the most promising solid electrolytes for electric vehicle all-solid-state batteries due to their high ionic conductivity at room temperature and excellent processability. However, sulfide-based solid electrolytes have low interfacial stability with existing cathode materials, leading to problems such as performance degradation and shortened lifespan; therefore, the development of suitable cathode materials is essential. Against this backdrop, lithium metal is being actively researched as a next-generation cathode material because it has a very high theoretical capacity of 3860 mAh g⁻¹ and a low density of 0.534 g cm⁻³ . However, lithium metal exhibits serious side reactions at the interface with sulfide-based solid electrolytes, and there is a risk of internal short circuits due to dendrite growth. As a prior art to solve this problem, a method was used in which a slurry containing constituent elements such as silver and carbon mixed in a dispersion medium was cast and dried to form a protective layer between lithium metal and a solid electrolyte. For example, a method of manufacturing an electrode involves producing a composite protective layer containing silver (Ag), which provides electrochemical stability, and carbon (C), which acts as a physical barrier, in the form of a slurry, applying it to a current collector, and then drying it. However, such dispersion-based slurry processes have limitations in that it is difficult to form a uniform protective layer due to differences in specific gravity and dispersion uniformity between silver and carbon, and in particular, it is difficult to sequentially cast different materials when designing multilayer electrode structures. Therefore, new interface design technologies are required to effectively suppress side reactions and dendritic growth between lithium metal and sulfide-based solid electrolytes. To this end, methods of forming multilayer structures using various inorganic materials (sulfides, oxides, nitrides, etc.) and polymer materials via electrophoresis are attracting attention as a new alternative. FIG. 1 is a flowchart illustrating a method for manufacturing a cathode according to an embodiment of the present invention. FIG. 2 is a drawing for explaining the step of preparing a negative current collector according to an embodiment of the present invention. FIG. 3 is a drawing for explaining the steps of preparing a first source, a second source, and a third source according to an embodiment of the present invention. FIG. 4 is a drawing for explaining the steps of manufacturing a base cathode according to an embodiment of the present invention. FIG. 5 is a diagram illustrating the steps for manufacturing a preliminary cathode according to an embodiment of the present invention. FIG. 6 is a drawing for explaining the steps of manufacturing a cathode according to an embodiment of the present invention. FIG. 7 is a drawing for explaining a cathode according to an embodiment of the present invention. FIG. 8 is a drawing for explaining a lithium-ion battery with a negative electrode applied according to an embodiment of the present invention. Figure 9 is an SEM image of the cathode according to Experimental Example 1 of the present invention. FIG. 10 is a photograph of the base cathode, preliminary cathode, and cathode according to Experimental Example 2 of the present invention. Figure 11 shows the manufacturing process of the cathode according to Experimental