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KR-20260062648-A - ACTIVATED CARBON MATERIAL FOR NEGATIVE ELECTRODE ACTIVE MATERIAL AND SILICON-CARBON COMPOSITE NEGATIVE ELECTRODE MATERIAL COMPRISING THE SAME

KR20260062648AKR 20260062648 AKR20260062648 AKR 20260062648AKR-20260062648-A

Abstract

An activated carbon body for a cathode active material according to one embodiment of the present invention comprises micropores and mesopores, wherein the surface area of the micropores measured by nitrogen gas adsorption is 1200 to 2000 m²/g, the surface area of the mesopores is 35 to 150 m²/g, and the ratio ( V1 / V2 ) of the volume of the micropores ( V1 ) and the volume of the mesopores ( V2 ) is 7.0 to 25.0.

Inventors

  • 장규연
  • 정지권
  • 박종현

Assignees

  • (주)포스코퓨처엠

Dates

Publication Date
20260507
Application Date
20241029

Claims (12)

  1. Includes micropores and mesopores, The surface area of the micropores measured by the nitrogen gas adsorption method is 1,200 to 2,000 m²/g, and the surface area of the mesopores is 35 to 150 m²/g, and An activated carbon body for a cathode active material, wherein the ratio ( V1 / V2 ) of the volume of the micropores ( V1 ) and the volume of the mesopores ( V2 ) is 7.0 to 25.0.
  2. In paragraph 1, The above activated carbon body is an activated carbon body for a cathode active material, having a pore structure of Type I as defined by IUPAC, based on a nitrogen adsorption-desorption isotherm based on the nitrogen gas adsorption method.
  3. In paragraph 2, An activated carbon body for a cathode active material, wherein, in the graph of the desorption isotherm of the nitrogen adsorption-desorption isotherm above, the absolute value of the slope in the relative pressure range of 0.1 to 1.0 is 10 to 50 cm³/g.
  4. In paragraph 1, An activated carbon body for a cathode active material, wherein the volume of the micropores is 0.30 to 0.80 cc/g.
  5. In paragraph 1, The above-described activated carbon is an activated carbon for a cathode active material having a first peak of 533.0±0.5 eV and a second peak of 531.5±0.5 eV in the O1s spectrum measured by X-ray Photoelectron Spectroscopy (XPS).
  6. In paragraph 5, An activated carbon body for a cathode active material, wherein the ratio ( A1 / A2 ) of the area of the first peak ( A1 ) and the area of the second peak ( A2 ) is 3.0 to 30.0.
  7. In paragraph 1, The above activated carbon body is an activated carbon body for a negative electrode active material, having a degree of sphericity of 0.85 or higher and being a perfectly spherical particle.
  8. In paragraph 1, The above-mentioned active carbon is an active carbon for a negative electrode active material, having a silicon (Si) deposition application.
  9. In paragraph 1, The above activated carbon is a steam-activated activated carbon for a cathode active material.
  10. In Paragraph 9, The above activated carbon is a cathode active material activated by steam activation at a temperature greater than 750°C and less than 900°C.
  11. Activated carbon body according to any one of claims 1 to 10; and A silicon-carbon composite cathode material comprising silicon-based particles located in the micropores and mesopores of the above-mentioned activated carbon body.
  12. cathode; Anode; and Contains electrolytes, The above-mentioned negative electrode comprises a silicon-carbon composite negative electrode material according to claim 11, in a lithium secondary battery.

Description

Activated carbon material for negative electrode active material and silicon-carbon composite negative electrode material comprising the same The present invention relates to an activated carbon body for a cathode active material and a silicon-carbon composite cathode material containing the same. As the market for electronic devices such as mobile phones, laptops, and PCs grows, the market for lithium-ion batteries, their power source, is also expanding rapidly. Furthermore, as interest in environmental issues grows and the demand for eco-friendly vehicles like electric cars increases, there is a growing trend of research into lithium-ion batteries capable of meeting various applications. Among the components of a lithium-ion battery, the negative electrode active material stores lithium ions during charging and plays a crucial role in determining charging speed and battery capacity. Silicon materials are attracting attention as such negative electrode active materials due to their high capacity and excellent fast charging characteristics. However, when silicon material is used alone, there was a problem in that the battery's lifespan characteristics deteriorated due to somewhat low structural stability and large volume expansion and contraction during charging and discharging. To address the aforementioned problems, various attempts are continuously being made to utilize silicon-carbon composites, composed of silicon and carbon using carbon-based materials, as negative electrode active materials. For example, such silicon-carbon composites can be manufactured by depositing a silicon precursor onto the pore structure of carbon. Accordingly, while the type of carbon used in silicon-carbon composites is known to be a key factor in improving the electrochemical properties of secondary batteries, research on this topic has been limited to date. Figure 1 is a scanning electron microscope (SEM) image of the activated carbon body of Example 1. Figure 2 is a nitrogen adsorption/desorption isotherm for the activated carbon bodies of Example 1 and Comparative Example 2. Figure 3 is the XPS O1s spectrum for the activated carbon bodies of Example 1, Comparative Examples 1 and 2. Preferred embodiments of the present invention are described below. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, embodiments of the present invention are provided to more fully explain the present invention to those with average knowledge in the relevant technical field. In describing the embodiments of the present invention, if it is determined that a detailed description of known technology related to the present invention may unnecessarily obscure the essence of the present invention, such detailed description will be omitted. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, such definitions should be based on the content throughout this specification. The terms used in the detailed description are merely for describing the embodiments of the present invention and should not be limited in any way. Unless explicitly stated otherwise, expressions in the singular form include the meaning of the plural form. In this description, expressions such as “include” or “equipped” are intended to refer to certain characteristics, numbers, steps, actions, elements, parts or combinations thereof, and should not be interpreted to exclude the existence or possibility of one or more other characteristics, numbers, steps, actions, elements, parts or combinations thereof other than those described. Unless otherwise specifically defined in the specification of the present invention, % units mean weight %. The present invention will be described in detail below through each embodiment or example of the invention. It should be noted that each embodiment or example described in this specification is not limited to a single embodiment or example, but may also be combined with other embodiments or examples. Accordingly, the citation of claims in the patent claims is merely an example of an embodiment, and the technical concept of the present invention should not be interpreted as being limited only to a combination with the cited claims; rather, combinations with various claims are also included within the scope of the technical concept of the present invention. According to one embodiment of the present invention, an activated carbon body for a negative electrode active material is provided. The activated carbon body for a negative electrode active material according to one embodiment of the present invention comprises micropores and mesopores, wherein the surface area of the micropores measured by nitrogen gas adsorption is 1,200 to 2,000 m²/g, the surface area of the mes