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CN-122000284-A - Negative electrode for rechargeable lithium battery and rechargeable lithium battery including the same

CN122000284ACN 122000284 ACN122000284 ACN 122000284ACN-122000284-A

Abstract

A negative electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same are provided. The negative electrode includes a negative electrode current collector, and a negative electrode active material layer on the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material, a conductive material, a binder, and an additive.

Inventors

  • Gao Aixi
  • SHEN MINZHI
  • Jiang Renya
  • PU SHIYUAN
  • ZHENG YIXIN
  • LIN HONGZHEN
  • CHE SHIYING
  • Jin Menshu
  • YU MINGXI

Assignees

  • 三星SDI株式会社

Dates

Publication Date
20260508
Application Date
20251030
Priority Date
20241108

Claims (19)

  1. 1. A negative electrode for a rechargeable lithium battery, the negative electrode comprising: negative electrode current collector, and A negative electrode active material layer on the negative electrode current collector, Wherein the negative electrode active material layer includes a negative electrode active material, a binder, a conductive material, and an additive represented by formula 1 or formula 2; formula 1: ; Wherein each of R 1 to R 6 independently comprises a hydrogen atom or a substituted or unsubstituted C1 to C10 alkyl group, and Formula 2: ; Wherein R 7 to R 14 each independently comprise a hydrogen atom or a substituted or unsubstituted C1 to C10 alkyl group.
  2. 2. The negative electrode for a rechargeable lithium battery according to claim 1, wherein the additive comprises 1,3, 5-trioxane represented by the following formula 1-1: formula 1-1: 。
  3. 3. the negative electrode for a rechargeable lithium battery according to claim 1, wherein the additive comprises at least one of a compound represented by the following formula 1-2, a compound represented by the following formula 1-3, a compound represented by the following formula 1-4, and a combination thereof. Formula 1-2: ; Formulas 1-3: And (C) sum Formulas 1-4: 。
  4. 4. the negative electrode for a rechargeable lithium battery according to claim 1, wherein the conductive material, the binder and the negative electrode active substance are provided in a weight ratio of 1:a:b, "A" ranges from 1 to 3, and "B" ranges from 90 to 99.
  5. 5. The negative electrode for a rechargeable lithium battery according to claim 1, wherein the additive is provided in an amount ranging from 0.1wt% to 5wt%, relative to the total weight of the negative electrode active substance.
  6. 6. The negative electrode for a rechargeable lithium battery according to claim 5, wherein the additive is provided in an amount ranging from 0.2wt% to 1wt% with respect to the total weight of the negative electrode active substance.
  7. 7. The negative electrode for a rechargeable lithium battery according to claim 1, wherein the negative electrode active substance includes at least one of a carbon-based negative electrode active substance, a Si-based negative electrode active substance, a Sn-based negative electrode active substance, and a combination thereof.
  8. 8. The negative electrode for a rechargeable lithium battery according to claim 1, wherein the negative electrode active substance comprises graphite.
  9. 9. The negative electrode for a rechargeable lithium battery of claim 1, wherein the binder comprises at least one of a non-aqueous binder, an aqueous binder, a dry binder, and combinations thereof.
  10. 10. The negative electrode for a rechargeable lithium battery of claim 9, wherein the aqueous binder comprises at least one of styrene-butadiene rubber, (meth) acrylated styrene-butadiene rubber, (meth) acrylonitrile-butadiene rubber, (meth) acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinylpyrrolidone, polyepichlorohydrin, polyphosphazene, poly (meth) acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth) acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.
  11. 11. The negative electrode for a rechargeable lithium battery according to claim 1, wherein the negative electrode active material layer has a pellet density in a range of 1.4g/cc to 1.7 g/cc.
  12. 12. The negative electrode for a rechargeable lithium battery according to claim 1, wherein an adhesive strength between the negative electrode current collector and the negative electrode active material layer is in a range of 0.2gf/mm to 0.4 gf/mm.
  13. 13. A rechargeable lithium battery, the rechargeable lithium battery comprising: A positive electrode; a negative electrode, and The electrolyte is used for preparing the electrolyte, Wherein the negative electrode comprises the negative electrode of claim 1.
  14. 14. The rechargeable lithium battery of claim 13, wherein the positive electrode comprises a positive electrode active material, and The positive electrode active material includes a lithium composite oxide represented by formula 3: Formula 3: Li x M 1 y M 2 z M 3 1-y-z O 2-a X a x, a, y and z satisfy 0.5≤x≤1.8, 0≤a≤0.05, 0< y≤1, 0≤z≤1 and 0< y+z≤1, M 1 、M 2 and M 3 each independently comprise at least one of nickel, cobalt, manganese, aluminum, boron, barium, calcium, cerium, chromium, iron, molybdenum, niobium, silicon, strontium, magnesium, titanium, vanadium, tungsten, zirconium, and lanthanum, and combinations thereof, and X comprises at least one of fluorine, sulfur, phosphorus and chlorine.
  15. 15. The rechargeable lithium battery of claim 14, wherein the positive electrode active material comprises lithium cobalt oxide.
  16. 16. The rechargeable lithium battery of claim 13, having a life retention of 85% or greater at room temperature.
  17. 17. The rechargeable lithium battery of claim 13, having an ignition point in the range of 148 ℃ or greater.
  18. 18. The rechargeable lithium battery of claim 13, having a discharge rate in the range of 120% to 151%.
  19. 19. The rechargeable lithium battery of claim 13, wherein the rechargeable lithium battery comprises one of a cylindrical battery, a prismatic battery, a pouch-type battery, and a coin-type battery.

Description

Negative electrode for rechargeable lithium battery and rechargeable lithium battery including the same This patent application claims priority from korean patent application No. 10-2024-0158040, filed on 8 of 11 at 2024, the entire contents of which are incorporated herein by reference. Technical Field The present disclosure relates to a negative electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same. Background The increasing current state of battery-powered electronic devices, such as for example mobile phones, laptop computers, electric vehicles, etc., has driven an increase in the demand for rechargeable lithium batteries that exhibit high energy density and high capacity. Therefore, it may be beneficial to improve the performance of rechargeable lithium batteries. The rechargeable lithium battery includes a positive electrode and a negative electrode, each of which includes an active material that intercalates and deintercalates lithium ions, and an electrolyte, and generates electric energy through a redox reaction that occurs as lithium ions intercalate into the positive electrode and deintercalate from the negative electrode or intercalate into and deintercalate from the positive electrode. Disclosure of Invention The present disclosure describes a negative electrode for a rechargeable lithium battery that exhibits improved adhesive strength between a negative electrode active material layer and a negative electrode current collector. The present disclosure also describes rechargeable lithium batteries that exhibit improved heat resistance and safety. Example embodiments of the present disclosure include a negative electrode for a rechargeable lithium battery including a negative electrode current collector, and a negative electrode active material layer on the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material, a binder, a conductive material, and an additive represented by the following formula 1 or formula 2. [ 1] In formula 1 above, R 1 to R 6 are each independently a hydrogen atom or a substituted or unsubstituted C1 to C10 alkyl group. [ 2] In formula 2 above, R 7 to R 14 are each independently a hydrogen atom or a substituted or unsubstituted C1 to C10 alkyl group. In example embodiments of the present disclosure, a rechargeable lithium battery includes a positive electrode, a negative electrode, and an electrolyte. The negative electrode is the negative electrode described above for a rechargeable lithium battery. Drawings The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the disclosure. In the drawings: Fig. 1 is a simplified conceptual diagram illustrating a rechargeable lithium battery according to an example embodiment of the present disclosure; FIG. 2 is a cross-sectional view for describing a negative electrode plate according to an exemplary embodiment of the present disclosure, and Fig. 3 to 6 are schematic views illustrating a rechargeable lithium battery according to an example embodiment of the present disclosure, fig. 3 illustrates a cylindrical battery, fig. 4 illustrates a prismatic battery, and fig. 5 and 6 illustrate pouch-type batteries. Detailed Description In order that the construction and effects of the present disclosure may be fully understood, exemplary embodiments of the present disclosure are described with reference to the accompanying drawings. It should be noted, however, that the present disclosure is not limited to the following embodiments, and may be embodied in various forms and modified in various forms. The example embodiments herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening third elements may be present therebetween. In addition, in the drawings, the thickness of components may be exaggerated for the purpose of effectively describing the technical contents. Like numbers refer to like elements throughout. The example embodiments described herein are explained with reference to cross-sectional and/or plan views as ideal example views of the present disclosure. In the drawings, the thickness of films and regions may be exaggerated for the purpose of effectively describing the technical contents. Accordingly, the regions presented as examples in the figures have general properties, and the shape of the illustrated regions is used to illustrate the specific shape of the device region. Accordingly, this should not be construed as limiting the scope of the