KR-20260062458-A - LITHIUM METAL ANODE MATERIAL FOR NEXT GENERATION BATTERY USING PERFLUORINATED LUBRICANT AND METHOD OF MANUFACTURING THEROF

KR20260062458AKR 20260062458 AKR20260062458 AKR 20260062458AKR-20260062458-A

Abstract

A lithium metal anode material for next-generation batteries and a method for manufacturing the same are disclosed, wherein a perfluorolubricant containing a large amount of fluorine groups (-F) is used to suppress lithium dendrite formation during the manufacturing process of a lithium metal anode material used from primary lithium batteries to next-generation batteries. A method for manufacturing a lithium metal anode material for a next-generation battery using a perfluorinated lubricant according to the present invention comprises the steps of: conveying a lithium metal strip to a rolling press roller; and rolling the lithium metal strip with the rolling press roller while applying a perfluorinated lubricant to the surface of the rolling press roller to form a lithium metal foil; wherein a LiF-based fluorinated interface layer that facilitates the movement of lithium ions is formed on the surface of the lithium metal foil to suppress dendrite formation.

Inventors

이남희
강지훈
박경수
김종성

Assignees

주식회사 비츠로셀

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (8)

A step of transferring a lithium metal strip to a rolling press roller; and The method includes the step of forming a lithium metal foil by rolling a lithium metal strip with the rolling press roller while applying a perfluorolubricant to the surface of the rolling press roller; Characterized by having a LiF-based fluorinated interface layer formed on the surface of the above lithium metal foil to facilitate the movement of lithium ions and to suppress dendrite formation. Method for manufacturing a lithium metal anode material for next-generation batteries using a perfluorinated lubricant.
In paragraph 1, The above lithium metal foil is Characterized by having a thickness of 30 to 60㎛, Method for manufacturing a lithium metal anode material for next-generation batteries using a perfluorinated lubricant.
In paragraph 1, The above perfluorolubricant is Characterized by using a composition of 100 vol% perfluorinated polyether, Method for manufacturing a lithium metal anode material for next-generation batteries using a perfluorinated lubricant.
In paragraph 1, Characterized by having a perfluorolubricant coating layer formed on the surface of the above lithium metal foil, Method for manufacturing a lithium metal anode material for next-generation batteries using a perfluorinated lubricant.
In paragraph 4, The above perfluorolubricant coating layer Characterized by having a thickness of 0.1 to 3㎛, Method for manufacturing a lithium metal anode material for next-generation batteries using a perfluorinated lubricant.
A lithium metal anode material for a next-generation battery using a perfluorolubricant manufactured by a method according to any one of claims 1 to 5, By rolling while applying a perfluorolubricant to a rolling press roller, it has a thickness of 30 to 60 μm, and Characterized by forming a LiF-based fluorinated interface layer that facilitates the movement of lithium ions on the surface of the above-mentioned cathode material to suppress dendrite formation. Lithium metal anode material for next-generation batteries using perfluorolubricant.
In paragraph 6, The above lithium metal anode material is Characterized by having a perfluorolubricant coating layer with a thickness of 0.1 to 3㎛ formed on the surface, Lithium metal anode material for next-generation batteries using perfluorolubricant.
In paragraph 6, The above lithium metal anode material is Characterized by being applicable to at least one of a lithium primary battery to a lithium-based next-generation battery, Lithium metal anode material for next-generation batteries using perfluorolubricant.

Description

Lithium metal anode material for next-generation battery using perfluorolubricant and method of manufacturing the same The present invention relates to a lithium metal anode material for next-generation batteries using a perfluorinated lubricant and a method for manufacturing the same. More specifically, the invention relates to a lithium metal anode material for next-generation batteries using a perfluorinated lubricant containing a large amount of fluorine groups (-F) during the manufacturing process of a lithium metal anode material used from primary lithium batteries to next-generation batteries, thereby suppressing the formation of lithium dendrites, and a method for manufacturing the same. Recently, as part of efforts to improve the energy density of lithium metal secondary batteries, research is underway to directly utilize lithium metal foil as the anode material without a separate anode active material. Lithium metal has a high ionization tendency and low density, and also has a very low standard electrode potential, resulting in a very high specific capacity. However, lithium metal secondary batteries have problems such as internal short circuits caused by lithium dendrite growth and the risk of explosion that may occur due to exposure to moisture. Therefore, if the problem caused by lithium dendrite growth is resolved, lithium metal secondary batteries have the advantage of achieving the highest energy density. To meet the thickness requirements of the lithium metal anode material for these next-generation batteries, lithium metal extruded in foil form is rolled. However, lithium metal is soft and highly reactive with moisture, and it has a tendency to stick to lithium or other materials. Therefore, in the rolling process where the thickness of lithium metal foil is reduced by pressing with strong pressure, there is a need for a rolling method that is non-reactive with lithium and does not stick to the rolling press rollers. A relevant prior art document is Korean Patent Publication No. 10-2023-0102481 (published July 7, 2023), which describes a lithium rolling apparatus and a lithium rolling method using the same. Figure 1 is a schematic diagram of a process to explain a general lithium metal anode manufacturing process. FIG. 2 is a process flowchart showing a method for manufacturing a lithium metal anode material for a next-generation battery using a perfluorinated lubricant according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a process for explaining the manufacturing process of a lithium metal anode material for a next-generation battery using a perfluorinated lubricant according to an embodiment of the present invention. Figure 4 is an SEM image showing the state of the lithium metal symmetric cell according to Comparative Example 1 before evaluation. Figure 5 is an EDS analysis photograph showing the state of the lithium metal symmetric cell before evaluation according to Comparative Example 1. Figure 6 is an SEM image showing the state after evaluation of a lithium metal symmetric cell according to Comparative Example 1. Figure 7 is an EDS analysis photograph showing the state measured after evaluating the lithium metal symmetric cell according to Comparative Example 1. Figure 8 is an SEM image showing the state of the lithium metal symmetric cell according to Comparative Example 2 before evaluation. Figure 9 is an EDS analysis photograph showing the state of the lithium metal symmetric cell before evaluation according to Comparative Example 2. Figure 10 is an SEM image showing the state after evaluation of a lithium metal symmetric cell according to Comparative Example 2. Figure 11 is an EDS analysis photograph showing the state measured after evaluating a lithium metal symmetric cell according to Comparative Example 2. FIG. 12 is an SEM image showing the state of the lithium metal symmetric cell before evaluation according to Example 1. FIG. 13 is an EDS analysis photograph showing the state of the lithium metal symmetric cell before evaluation according to Example 1. FIG. 14 is an SEM image showing the state after evaluating the lithium metal symmetric cell according to Example 1. FIG. 15 is an EDS analysis photograph showing the state measured after evaluating a lithium metal symmetric cell according to Example 1. FIG. 16 is a graph showing a comparison of the evaluation results of lithium metal symmetric cells according to Example 1 and Comparative Examples 1 and 2. FIG. 17 is an SEM image showing a comparison of the surface state after evaluating lithium metal symmetric cells according to Example 1 and Comparative Examples 1 and 2. The advantages 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 accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various diff