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KR-20260064645-A - Cathode material and secondary battery comprising the same

KR20260064645AKR 20260064645 AKR20260064645 AKR 20260064645AKR-20260064645-A

Abstract

One embodiment of the present invention provides a cathode material comprising a first layer, a second layer disposed on one surface of the first layer, and a third layer disposed on a surface of the second layer facing in a direction opposite to the direction facing the first layer, wherein the first layer comprises lithium metal, the second layer comprises carbon, and the third layer comprises a lithium-affinity material.

Inventors

  • 백창근
  • 우준혁
  • 유승일

Assignees

  • 주식회사 니바 코퍼레이션

Dates

Publication Date
20260507
Application Date
20251031
Priority Date
20241031

Claims (6)

  1. Layer 1; A second layer disposed on one side of the first layer; and It includes a third layer disposed on the other side opposite to the side on which the first layer of the second layer is disposed, and The first layer comprises lithium metal, the second layer comprises carbon, and the third layer comprises a lithium-affinity material. Cathode material.
  2. In paragraph 1, The above lithium-affinity material comprises a metal or a metal oxide, Cathode material.
  3. In paragraph 1, The content of the second layer is 0.001 wt% to 10 wt% relative to the weight of the first layer, cathode material
  4. In paragraph 1, The content of the third layer is 0.001 wt% to 20 wt% relative to the weight of the first layer, cathode material
  5. Layer 1; A second layer disposed on one side of the first layer; A third layer disposed on the other side opposite to the side on which the first layer of the second layer is disposed; and A fourth layer disposed on the other side opposite to the side on which the second layer of the third layer is disposed; comprising The first layer comprises lithium metal, the second layer comprises a lithium-affinity material, the third layer comprises carbon, and the fourth layer comprises a lithium-affinity material, Cathode material.
  6. A secondary battery comprising a negative electrode material according to any one of claims 1 to 5.

Description

Cathode material and secondary battery comprising the same The present invention relates to a negative electrode material and a secondary battery containing the same. While carbon has generally been primarily used as the anode material in secondary batteries, lithium metal has recently been receiving significant attention as a next-generation anode material. Compared to graphite anodes, lithium metal anodes have a much higher capacity, are very lightweight, and can generate higher energy with a lower redox voltage. However, lithium metal anodes exhibit high interfacial resistance due to arbitrary films on the surface, and uneven lithium ion deposition can lead to localized accumulation of lithium ions and the formation of dendrites. This can result in internal short circuits and safety issues. FIG. 1 is a cross-sectional view schematically illustrating an example of a lithium metal negative electrode material according to one embodiment of the present invention. FIG. 2 is a cross-sectional view schematically illustrating an example of a lithium metal negative electrode material according to another embodiment of the present invention. 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 cross-sectional view schematically illustrating an example of a lithium metal negative electrode material according to one embodiment of the present invention. Referring to FIG. 1, a cathode material (10) according to one embodiment of the present invention may include a first layer (11), a second layer (12) disposed on the first layer (11), and a third layer (13) disposed on the second layer (12). The first layer (11) may include lithium metal, and the lithium metal may include, for example, a thin film. The second layer (12) may be disposed on one side of the first layer (11), and, for example, may be a coating layer that coats one side of the first layer (11). As a specific example, the second layer (12) may include carbon, and the carbon may include materials with excellent electrical conductivity, and as a specific example, may include one or more selected from CNT (SWCNT, MWCNT), CNF, graphene, crystalline or amorphous carbon. Meanwhile, the coating content of the second layer (12) coated on one side of the first layer (11) containing lithium metal can be 0.001 wt% to 10 wt% relative to the lithium weight of the first layer (11). Meanwhile, if the coating content of the second layer (12) is less than 0.001 wt% relative to the lithium weight of the first layer (11), there is a problem in that the lithium metal of the first layer (11) comes into direct contact with the electrolyte and does not suppress the formation of the SEI film, and if the coating content of the second layer (12) is more than 10 wt% relative to the lithium weight of the first layer (11), there may be a problem in that the movement path of lithium ions increases and the electrochemical properties of the negative electrode material (10) decrease. The third layer (13) may be disposed on the second layer (12) on a side opposite to the side on which the first layer (11) of the second layer (12) is disposed, and, for example, may be a coati