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CN-122029645-A - Negative electrode active material, negative electrode composition comprising same, negative electrode, and secondary battery

CN122029645ACN 122029645 ACN122029645 ACN 122029645ACN-122029645-A

Abstract

The present specification relates to a negative electrode active material, and a negative electrode and a secondary battery including the same. According to an exemplary embodiment of the present invention, there is provided a negative electrode active material including a silicon-based active material and a coating layer disposed thereon, wherein the silicon-based active material includes one or more selected from the group consisting of pure Si, siO x (0 < x < 2), and Si/C, and the coating layer includes an inorganic flame retardant.

Inventors

  • LI SHANGXUAN
  • JIN DONGHE
  • LI LONGZHU

Assignees

  • 株式会社LG新能源

Dates

Publication Date
20260512
Application Date
20250826
Priority Date
20240826

Claims (18)

  1. 1. A negative electrode active material, the negative electrode active material comprising: silicon-based active material, and A coating layer disposed on the silicon-based active material, wherein The silicon-based active material contains one or more selected from the group consisting of Si, siO x (0 < x < 2), and Si/C, and The coating comprises an inorganic flame retardant.
  2. 2. The anode active material according to claim 1, wherein the inorganic flame retardant undergoes an endothermic reaction at 100 ℃ to 250 ℃.
  3. 3. The anode active material according to claim 2, wherein the endothermic reaction is a dehydration reaction.
  4. 4. The anode active material according to claim 1, wherein the inorganic flame retardant contains one or more selected from the group consisting of aluminum hydroxide (Al (OH) 3 ), magnesium hydroxide (Mg (OH) 2 ), antimony trioxide (Sb 2 O 3 ), and zinc borate.
  5. 5. The anode active material according to claim 1, wherein the silicon-based active material contains Si, and the content of Si is 70 to 100 parts by weight with respect to 100 parts by weight of the silicon-based active material.
  6. 6. The anode active material according to claim 1, wherein the SiO x (0 < x < 2) further contains a metal distributed on the surface, inside, or both surface and inside of the SiO x (0 < x < 2), and The metal includes one or more selected from the group consisting of Li, mg, and Al.
  7. 7. The anode active material according to claim 1, wherein an average thickness of the coating layer is 0.02 μm to 10 μm.
  8. 8. The anode active material according to claim 1, wherein the content of the inorganic flame retardant is 95 parts by weight or more with respect to 100 parts by weight of the coating layer.
  9. 9. The anode active material according to claim 1, wherein the inorganic flame retardant has an average particle diameter (D50) of 0.05 μm to 1.5 μm.
  10. 10. A negative electrode composition, the negative electrode composition comprising: the anode active material according to any one of claims 1 to 9; Negative electrode binder, and A negative electrode conductive material.
  11. 11. The anode composition according to claim 10, wherein the anode active material is a first anode active material, and further comprising a carbon-based active material as a second anode active material.
  12. 12. The negative electrode composition according to claim 11, wherein the carbon-based active material comprises at least one selected from the group consisting of natural graphite and artificial graphite.
  13. 13. The anode composition according to claim 11, wherein the content of the first anode active material is 1 to 20 parts by weight relative to 100 parts by weight in total of the first anode active material and the second anode active material.
  14. 14. A negative electrode, the negative electrode comprising: negative electrode current collector layer, and A negative electrode active material layer formed on one surface or both surfaces of the negative electrode current collector layer, Wherein the anode active material layer contains the anode composition according to claim 10.
  15. 15. A secondary battery, the secondary battery comprising: A positive electrode; The anode according to claim 14; a separator disposed between the positive electrode and the negative electrode, and An electrolyte.
  16. 16. A battery module comprising the secondary battery according to claim 15.
  17. 17. A battery pack comprising the secondary battery according to claim 15.
  18. 18. A battery pack comprising the battery module of claim 16.

Description

Negative electrode active material, negative electrode composition comprising same, negative electrode, and secondary battery Technical Field The present application claims priority and rights of korean patent application No. 10-2024-0110280 filed at the korean intellectual property office at month 26 of 2024 and korean patent application No. 10-2025-0118041 filed at the korean intellectual property office at month 25 of 2025, the entire contents of which are incorporated herein by reference. The application relates to a negative electrode active material, a negative electrode composition, a negative electrode, a secondary battery, a battery module and a battery pack. Background The rapid increase in the use of fossil fuels has led to an increasing demand for alternative and clean energy sources. To cope with this demand, generation and storage of electricity by electrochemical reaction are one of the most active fields of research. Currently, secondary batteries are representative examples of electrochemical devices using such electrochemical energy, and their specific use ranges tend to be gradually expanded. As the technology development and demand for mobile devices have increased, the demand for secondary batteries has also increased rapidly. Among these secondary batteries, lithium secondary batteries exhibiting high energy density and voltage, long cycle life, and low self-discharge rate have been commercialized and widely used. In addition, in order to manufacture an electrode for a high-capacity lithium secondary battery, research is being actively conducted to develop a high-density electrode having a higher energy density per unit volume. In general, a secondary battery includes a positive electrode, a negative electrode, an electrolyte, and a separator. The negative electrode contains a negative electrode active material capable of inserting and extracting lithium ions from the positive electrode, and as the negative electrode active material, silicon-based particles having a high discharge capacity can be used. In particular, in order to cope with the recent increase in demand for high-density energy batteries, a method of increasing the capacity by using a silicon-based compound such as Si/C or SiOx, which has a capacity 10 times or more the capacity of a graphite-based material, as a negative electrode active material is being actively studied. Silicon-based compounds, which are high-capacity materials, have an advantage of having a larger capacity than graphite used in the related art, but have a problem in that thermal runaway is easily generated in a cell (cell) under actual operating conditions due to rapid expansion of the volume thereof during charging. Accordingly, research is required to develop a secondary battery that provides improved safety while having a high capacity. Accordingly, research is required to develop a secondary battery that provides improved safety while having a high capacity. Disclosure of Invention Technical problem The present invention has been made in an effort to provide a negative electrode active material, a negative electrode, and a secondary battery that provide improved safety under operating conditions while applying a silicon-based active material so as to have a high capacity. Technical proposal According to an exemplary embodiment of the present invention, there is provided a negative electrode active material including a silicon-based active material, and a coating layer disposed on the silicon-based active material, wherein the silicon-based active material includes one or more selected from the group consisting of Si, siO x (0 < x < 2), and Si/C, and the coating layer includes an inorganic flame retardant. Another exemplary embodiment of the present invention provides a negative electrode composition including a negative electrode active material according to one exemplary embodiment of the present invention, a negative electrode binder, and a negative electrode conductive material. Another exemplary embodiment of the present invention provides an anode comprising an anode current collector layer, and an anode active material layer formed on one surface or both surfaces of the anode current collector layer, wherein the anode active material layer comprises the anode composition according to one exemplary embodiment of the present invention. Another exemplary embodiment of the present invention provides a secondary battery including the negative electrode according to one exemplary embodiment of the present invention. Another exemplary embodiment of the present invention provides a battery module including the secondary battery according to one exemplary embodiment of the present invention. Another exemplary embodiment of the present invention provides a battery pack including the secondary battery or the battery module according to one exemplary embodiment of the present invention. Advantageous effects When the anode active material according to o