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CN-122025568-A - Negative electrode active material, negative electrode for lithium secondary battery, and lithium secondary battery comprising same

CN122025568ACN 122025568 ACN122025568 ACN 122025568ACN-122025568-A

Abstract

The present disclosure provides a negative electrode active material, a negative electrode for a lithium secondary battery, and a lithium secondary battery including the same. The anode active material according to one embodiment of the present disclosure includes a carbon-based active material, and a coating layer disposed on a surface of the carbon-based active material, the coating layer including a metal hydroxide. According to one embodiment of the present disclosure, high temperature stability of a negative electrode active material for a lithium secondary battery may be improved.

Inventors

  • JIN XIANZHEN
  • Xu Shuohao
  • Wen Qixuan
  • LI ZHONGHE

Assignees

  • SK新能源株式会社

Dates

Publication Date
20260512
Application Date
20251024
Priority Date
20241112

Claims (15)

  1. 1. A negative electrode active material comprising: a carbon-based active material, and A coating layer disposed on the surface of the carbon-based active material, The coating comprises a metal hydroxide.
  2. 2. The anode active material according to claim 1, wherein: the anode active material is a core-shell structure including a core and a shell disposed on a surface of the core, The core comprises a carbon-based active material, The shell comprises a metal hydroxide.
  3. 3. The anode active material according to claim 1, wherein: The metal hydroxide is represented by the following chemical formula 1, [ Chemical formula 1] M1 x M2 y M3 z (OH) a In the chemical formula 1, M2 and M3 are more than one metal selected from Al, ni, mg, zn and Cu respectively, and 0≤x≤1, 0≤y≤1, 0≤z≤1, 0< x+y+z≤1, 2≤a≤3.
  4. 4. The anode active material according to claim 1, wherein: The coating has a metal element content of 200ppm to 1000ppm according to inductively coupled plasma analysis.
  5. 5. The anode active material according to claim 1, wherein: The BET specific surface area value of the negative electrode active material is equal to or less than the BET specific surface area value of the carbon-based active material.
  6. 6. The anode active material according to claim 1, wherein: the BET specific surface area value of the negative electrode active material is 0.5m 2 /g to 1.5m 2 /g.
  7. 7. A method for producing a negative electrode active material, comprising: a step of forming a coating layer on the surface of the carbon-based active material, The coating comprises a metal hydroxide.
  8. 8. The method for producing a negative electrode active material according to claim 7, wherein the step of forming the coating layer comprises: a step of preparing a powder from a mixture of the carbon-based active material and a solution containing a metal salt, and A step of heat-treating the powder.
  9. 9. The method for producing a negative electrode active material according to claim 8, wherein: The metal salt comprises at least one of metal nitrate, metal carbonate, metal chloride, metal phosphate, metal borate, metal oxide, metal sulfonate, metal sulfate, metal stearate, metal myristate, metal acetate and metal undecylenate.
  10. 10. The method for producing a negative electrode active material according to claim 8, wherein: The solids content of the mixture is 75 to 95 wt.%.
  11. 11. The method for producing a negative electrode active material according to claim 8, wherein the step of producing a powder from the mixture comprises: a step of drying the mixture to obtain a powder, and Subjecting the powder to and (3) grading.
  12. 12. The method for producing a negative electrode active material according to claim 8, wherein the heat treatment is performed at a temperature of 200 ℃ to 700 ℃.
  13. 13. The method for producing a negative electrode active material according to claim 8, wherein the heat treatment is performed for 1 to 3 hours.
  14. 14. A negative electrode for a lithium secondary battery, comprising the negative electrode active material according to any one of claims 1 to 6.
  15. 15. A lithium secondary battery comprising the negative electrode for a lithium secondary battery according to claim 14.

Description

Negative electrode active material, negative electrode for lithium secondary battery, and lithium secondary battery comprising same Technical Field The present disclosure relates to a negative electrode active material, a negative electrode for a lithium secondary battery, and a lithium secondary battery including the same. Background In recent years, an Electric Vehicle (EV) that can replace a fossil fuel-based vehicle, which is one of the main causes of air pollution, is actively studied, and as a power source of such an Electric Vehicle (EV), a lithium secondary battery having high discharge voltage and power stability is mainly employed. Therefore, there is a need to develop a technology capable of improving the performance of lithium secondary batteries. Disclosure of Invention Technical problem According to one aspect of the present disclosure, a negative electrode active material for a lithium secondary battery having excellent high temperature stability may be provided. According to another aspect of the present disclosure, high temperature driving performance of a lithium secondary battery may be improved. Technical proposal The anode active material according to one embodiment includes a carbon-based active material, and a coating layer disposed on a surface of the carbon-based active material, wherein the coating layer includes a metal hydroxide. In some embodiments, the anode active material may be a core-shell structure including a core, which may include a carbon-based active material, and a shell disposed on a surface of the core, which may include a metal hydroxide. In some embodiments, the metal hydroxide may be represented by the following chemical formula 1: [ chemical formula 1] M1xM2yM3z(OH)a In the chemical formula 1, M2 and M3 are more than one metal selected from Al, ni, mg, zn and Cu respectively, and 0≤x≤1, 0≤y≤1, 0≤z≤1, 0< x+y+z≤1, 2≤a≤3. In some embodiments, the coating may have a metal element content of 200ppm to 1000ppm according to Inductively Coupled Plasma (ICP) analysis. In some embodiments, the BET specific surface area value of the negative electrode active material may be less than or equal to the BET specific surface area value of the carbon-based active material. In some embodiments, the BET specific surface area value of the anode active material may be 0.5m 2/g to 1.5m 2/g. The method of preparing a negative active material according to one embodiment includes a step of forming a coating layer including a metal hydroxide on a surface of a carbon-based active material. In some embodiments, the step of forming the coating may include the steps of preparing a powder from a mixture of a carbon-based active material and a solution containing a metal salt, and heat treating the powder. In some embodiments, the metal salt may include at least one of a metal nitrate, a metal carbonate, a metal chloride, a metal phosphate, a metal borate, a metal oxide, a metal sulfonate, a metal sulfate, a metal stearate, a metal myristate, a metal acetate, and a metal undecylenate. In some embodiments, the solids content of the mixture may be 75 to 95 weight percent. In some embodiments, the step of preparing a powder from the mixture may include the step of drying the mixture to obtain a powder, and the step of classifying the powder. In some embodiments, the heat treatment may be performed at a temperature of 200 ℃ to 700 ℃. In some embodiments, the heat treatment may be performed for 1 hour to 3 hours. The anode for a lithium secondary battery according to one embodiment contains the anode active material according to any one of the above embodiments. The lithium secondary battery according to one embodiment includes the negative electrode for a lithium secondary battery according to any one of the above-described embodiments. Technical effects According to one embodiment of the present disclosure, high temperature stability of a negative electrode active material for a lithium secondary battery may be improved. According to another embodiment of the present disclosure, a lithium secondary battery excellent in high-temperature driving performance may be provided. Drawings Fig. 1 is a cross-sectional view conceptually showing a morphology of a negative electrode active material according to one embodiment; Fig. 2 is a graph showing the results of high-temperature storage capacity retention rate evaluation of lithium secondary batteries according to examples and comparative examples; fig. 3 is a graph showing the results of high-temperature life capacity retention rate evaluation of lithium secondary batteries according to examples and comparative examples. Description of the reference numerals 10 Carbon-based active Material 11 Coating 100 Negative electrode active material Detailed Description The technology and its embodiments disclosed in the present specification are described in detail below. However, the embodiments of the technology may be modified in various ways, and the scope t