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KR-20260064646-A - Cathode material and secondary battery comprising the same

KR20260064646AKR 20260064646 AKR20260064646 AKR 20260064646AKR-20260064646-A

Abstract

One embodiment of the present invention discloses a cathode material comprising a first layer comprising lithium metal and micro-sized particles located on one surface of the first layer.

Inventors

  • 백창근
  • 우준혁
  • 유승일

Assignees

  • 주식회사 니바 코퍼레이션

Dates

Publication Date
20260507
Application Date
20251031
Priority Date
20241031

Claims (5)

  1. A first layer comprising lithium metal; and Micro-sized particles located on one surface of the first layer; comprising Cathode material.
  2. In paragraph 1, The above particles comprise one or more selected from silicon (Si), zinc (Zn), carbon (C), and oxygen (O), Cathode material.
  3. In paragraph 2, The above particles contain silicon (Si) and zinc (Zn), and The above silicon (Si) is included in an amount of 0.01 at% to 5 at%, and the above zinc (Zn) is included in an amount of 0.1 at% to 30 at%, Cathode material.
  4. In paragraph 2, The above particles include silicon (Si), zinc (Zn), carbon (C), and oxygen (O), and The above carbon (C) is included in an amount of 10 at% to 50 at%, the above oxygen (O) is included in an amount of 30 at% to 80 at%, the above silicon (Si) is included in an amount of 0.01 at% to 5 at%, and the above zinc (Zn) is included in an amount of 0.1 at% to 30 at%, Cathode material.
  5. A secondary battery comprising a negative electrode material according to any one of claims 1 to 4.

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 offer very high capacity, are very lightweight, and can generate higher energy with a low redox voltage. However, lithium metal anodes exhibit high interfacial resistance due to arbitrary films on their surface, and uneven lithium ion deposition can lead to localized lithium ion accumulation and the formation of dendrites. This can result in internal short circuits and safety issues. Furthermore, the SEI film formed by the reaction with the electrolyte during lithium deposition can cause problems such as very low charge/discharge efficiency and reduced lifespan characteristics. Figure 1 is a photograph of the surface of a cathode material according to one embodiment of the present invention taken with an SEM. Figure 2 is a SEM image of the surface of an untreated cathode material. Figure 3 is a photograph of the surface of a cathode material according to another embodiment of the present invention taken with an SEM. Figure 4 is an EDS graph for the surface of the cathode material of Figure 3. 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. (Cathode material) A cathode material according to one embodiment of the present invention includes a first layer, and micro-sized particles may be uniformly distributed on one surface of the first layer. The first layer may include lithium metal, and the lithium metal may include a thin film. Powder particles can be treated on the surface of the first layer so that micro-sized particles are uniformly distributed, and as a specific example, particles within 10 μm can be uniformly distributed on one side of the first layer. The particles may include one or more selected from silicon (Si), zinc (Zn), carbon (C), and oxygen (O), and as a specific example, the particles may include Si and Zn. In this case, Si may be processed on one surface of the first layer with a content of 0.01 at% to 5 at% and Zn may be processed with a content of 0.1 at% to 30 at%, so as to be uniformly distributed on one surface of the first layer. FIG. 1 is a photograph of the surface of a cathode material according to one embodiment of the present invention taken with an SEM, and FIG. 2 is a photograph of the surface of an untreated cathode material taken with an SEM. Referring to FIG. 1 and FIG. 2, in the case of the cathode material of FIG. 2, where nothing is treated on one side of the first layer, it can be seen that the surface is formed smoothly, and in the case of FIG. 1, where micro-sized particles are treated on one side of the first layer, it can be seen that the surface of the first layer is uniformly covered by the particles. Meanwhile, a cathode material according to one embodiment of the present invention, in which particles uniformly cover the surface of the first layer, may have very low surface resistance and excellent lifespan characteristics compared to a cathode material that does not. Meanwhile, Si and Zn covering the first layer may be lithium-affinity materials, so when the surface of the first layer is treated w