KR-102962430-B1 - Lithium metal foil surface treatment method and lithium secondary battery including lithium metal foil surface treated by the same method

KR102962430B1KR 102962430 B1KR102962430 B1KR 102962430B1KR-102962430-B1

Abstract

One embodiment of the present invention provides a lithium metal foil surface treatment method comprising the steps of applying a solution comprising one or more selected from the group consisting of compounds containing carbonyl groups to a lithium metal foil, and drying the lithium metal foil on which the solution is applied.

Inventors

유승일
백창근
박주희

Assignees

주식회사 니바 코퍼레이션

Dates

Publication Date: 20260511
Application Date: 20231228

Claims (6)

A step of applying a solution comprising one or more selected from the group consisting of compounds containing carbonyl groups to a lithium metal foil; and The method includes the step of drying the lithium metal foil coated with the above solution; The above lithium metal foil has a film containing a lithium compound formed on its surface, and A method for treating the surface of a lithium metal foil in which the carbonyl group undergoes a pinacol coupling reaction with the lithium compound, thereby reducing the thickness of the film.
In paragraph 1, A method for surface treatment of a lithium metal foil, comprising, after the step of applying the above solution to a lithium metal foil, the step of washing the lithium metal foil to which the above solution has been applied in an organic solvent.
In paragraph 1, A method for treating the surface of a lithium metal foil, wherein the above solution comprises one or more compounds selected from Chemical Formula 1 or Chemical Formula 2. [Chemical Formula 1] [Chemical Formula 2] (In the above chemical formulas 1 to 2, R1 to R10 are alkyl groups having 1 to 6 carbon atoms).
In paragraph 1, A method for surface treatment of a lithium metal foil comprising any one selected from diethyl ketone, methyl isobutyl ketone, or diisobutyl ketone, wherein the compound containing the carbonyl group above.
A lithium metal foil surface-treated by the lithium metal foil surface treatment method of any one of claims 1 to 4.
A lithium secondary battery comprising the lithium metal foil of claim 5 as the negative electrode.

Description

Lithium metal foil surface treatment method and lithium secondary battery including lithium metal foil surface treated by the same method The present invention relates to a method for surface treatment of a lithium metal foil and a lithium secondary battery comprising a lithium metal foil surface-treated by the same method. Lithium metal is a silvery-white alkali metal that is very light (0.534 g/mol), has a low redox voltage (-3.04 V vs. Hydrogen), and high specific capacity (3860 mAh/g), making it a promising anode material for high-capacity lithium batteries. Lithium metal anode materials are used in the form of thin foils with a thickness of 1 mm or less, and in particular, anode materials for secondary batteries are used in the form of thin foils with a thickness of 0.1 mm or less. The characteristics of the film formed on the surface of the lithium anode have a very significant impact on the performance and storage characteristics of the battery. Meanwhile, lithium has a very high reactivity with compounds and moisture that make up air, so it is unavoidable that a film formed on the surface by air and moisture is formed to some extent. Therefore, it is important to manufacture lithium foil products with a stable film. However, in conventional methods of manufacturing lithium foil in a dry room environment, the film on the surface of the lithium foil is not uniform depending on the conditions of the dry room. To solve this, a method of manufacturing lithium foil in a glove box with an argon gas atmosphere instead of air has been developed, but there are problems such as high costs and the inability to freely manufacture lithium foil with a wide width because it is manufactured in a limited space called a glove box. FIG. 1 is a flowchart illustrating an example of a lithium metal foil surface treatment method according to an embodiment of the present invention. Figure 2 is a flowchart illustrating another example of the lithium metal foil surface treatment method of Figure 1. FIG. 3 is a cross-sectional view illustrating an example of a lithium secondary battery comprising a lithium metal foil treated by the lithium metal foil surface treatment method of FIG. 1. The present invention is capable of various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various forms. In the following embodiments, terms such as first, second, etc. are used not in a limiting sense, but for the purpose of distinguishing one component from another component. In the following examples, singular expressions include plural expressions unless the context clearly indicates otherwise. In the following embodiments, terms such as "include" or "have" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added. In the following embodiments, when a part such as a film, region, or component is described as being on or above another part, it includes not only cases where it is directly on top of another part, but also cases where another film, region, or component is interposed in between. In the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is illustrated. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings, and when describing with reference to the drawings, identical or corresponding components will be given the same reference numerals. FIG. 1 is a flowchart illustrating an example of a lithium metal foil surface treatment method according to an embodiment of the present invention. Referring to FIG. 1, a lithium metal foil surface treatment method (S1) may include the step (S11) of applying a solution containing one or more selected from the group of compounds containing carbonyl groups to a lithium metal foil, and the step (S12) of drying the lithium metal foil to which the solution is applied. In the step (S11) of applying a solution containing one or more selected from the group of compounds containing carbonyl groups to a lithium metal foil, the solution applied to the lithium metal foil may be a solution to which one or more selected from the group of compounds containing carbonyl groups have been added. As an example, the compounds containing carbonyl groups may include aldehydes and ketones, and as a specific examp