KR-102962531-B1 - SECONDARY BATTERY ANODE MATERIAL AND METHOD FOR PRODUCING THE SAME

Abstract

A method for manufacturing a secondary battery negative electrode material is introduced, comprising the steps of: mixing carbon particles and nanometal particles in a dispersion, dispersing the mixture, and drying to produce coating particles in which nanometal is coated on carbon particles; mixing the coating particles with a flux to produce a coating material; and coating the coating material onto a copper substrate and sintering it.

Inventors

• 김용상

Dates

Publication Date

20260507

Application Date

20230919

Claims (6)

1. A step of producing coated particles in which nanometal is coated on carbon particles by mixing and dispersing carbon particles and nanometal particles in a dispersion and drying; A step of producing a coating material by mixing coating particles and flux; and A method for manufacturing a secondary battery negative electrode material comprising the step of coating a coating material onto a copper substrate and sintering it to form micropores at the metal-carbon interface.
2. In claim 1, A method for manufacturing a secondary battery negative electrode material characterized in that the carbon particles are graphite particles.
3. In claim 1 or 2, A method for manufacturing a secondary battery negative electrode material characterized in that the nanometal particles are Ag nanoparticles.
4. In claim 1 or 2, A method for manufacturing a secondary battery negative electrode material characterized in that the nanometal particles are SAC (Sn-Ag-Cu) nanoparticles.
5. In claim 1 or 2, A method for manufacturing a secondary battery negative electrode material characterized in that the nanometal particles are one or more of Sn, Ag, Cu, Sb, Pb, or SAC nanoparticles.
6. A secondary battery negative electrode material manufactured by the method of claim 1.

Description

Secondary battery anode material and method for producing the same The present invention relates to a secondary battery negative electrode material with increased charging capacity. The negative electrode of a lithium-ion secondary battery plays the role of generating electricity by storing and releasing lithium ions from the positive electrode. During charging, lithium ions are stored in the negative electrode, and during discharging, the lithium ions are moved to the positive electrode through the electrolyte; as electrons separated from the lithium ions move along the wire, electricity is generated. The cathode active material must possess ① smooth ion conductivity, ② large capacity and high output capable of storing a large amount of lithium ions, ③ long lifespan, ④ structural stability, ⑤ low electrochemical reactivity, and ⑥ low cost. The anode consists of an active anode material, a conductive agent, and a binder coated on a copper substrate, and graphite, which possesses a stable structure, is typically used for the anode. Graphite is considered a material that meets many of the requirements for an active anode, such as high capacity capable of storing large amounts of lithium ions, structural stability with a long lifespan, low electrochemical reactivity, and low cost. The anode material plays the role of accepting lithium ions generated from the cathode. Since a stable structure is essential, graphite, composed of carbon, is primarily used. However, it is difficult to increase the capacity of graphite. It takes a long time to produce high-purity products suitable for battery use. It is necessary to maintain the inherent advantages of graphite while enhancing performance and achieving price competitiveness. The anode material determines the characteristics of the battery. If the anode material changes, the system changes, and it can be called a new type of battery. The matters described above as background technology are intended only to enhance understanding of the background of the present invention and should not be construed as an acknowledgment that they constitute prior art already known to those skilled in the art. FIGS. 1 to 4 are drawings for explaining a secondary battery negative electrode material and a method for manufacturing the same according to an embodiment of the present invention, and for explaining the effects according to test results. Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components regardless of drawing symbols are given the same reference number, and redundant descriptions thereof will be omitted. In describing the embodiments disclosed in this specification, if it is determined that a detailed description of related prior art may obscure the essence of the embodiments disclosed in this specification, such detailed description is omitted. Furthermore, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of the present invention. Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. A singular expression includes a plural expression unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. The present invention relates to a secondary battery negative electrode material with increased charging capacity. The theoretical charging capacity of graphite is 430 mAh/g, and efforts are continuing to increase the driving range of electric vehicles by increasing the capacity of the negative electrode material. To achieve this increase in the capacity of the negative electrode material, silicon, which has a relatively high charging capacity, is mixed and applied to the negative electrode material; however, silicon exhibits significant swelling, which limits the increase in silicon usage. Consequently, there is a need for a negative electrode material based on a new concept that can lead the development direction of such negative electrode materials. The present invention is identical to the prior art in that it uses graphite as the raw material for the negative electrode material of a secondary battery, but it