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EP-4742316-A1 - NEGATIVE ELECTRODE FOR RECHARGEABLE LITHIUM BATTERY AND RECHARGEABLE LITHIUM BATTERY INCLUDING THE SAME

EP4742316A1EP 4742316 A1EP4742316 A1EP 4742316A1EP-4742316-A1

Abstract

Provided are a negative electrode for a rechargeable lithium battery, and a rechargeable lithium battery including the negative electrode. 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

  • GOH, AEHUI
  • Sim, Minji
  • KANG, INAH
  • Park, Sewon
  • JEONG, Hanmam
  • LIM, Hongjin
  • CHA, SI-YOUNG
  • KIM, MINSEO
  • WOO, MYUNGHEUI

Assignees

  • SAMSUNG SDI CO., LTD.

Dates

Publication Date
20260513
Application Date
20251106

Claims (15)

  1. A negative electrode for a rechargeable lithium battery, the negative electrode comprising: a 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; wherein R 1 to R 6 each independently comprises a hydrogen atom or a substituted or unsubstituted C1 to C10 alkyl group, and wherein R 7 to R 14 each independently comprises a hydrogen atom or a substituted or unsubstituted C1 to C10 alkyl group.
  2. The negative electrode for a rechargeable lithium battery of claim 1, wherein the additive comprises 1,3,5-trioxane (TRX) represented by Formula 1-1 below:
  3. The negative electrode for a rechargeable lithium battery of claim 1 or 2, wherein the additive comprises at least one of a compound represented by Formula 1-2 below, a compound represented by Formula 1-3 below, a compound represented by Formula 1-4 below, and a combination thereof: and
  4. The negative electrode for a rechargeable lithium battery of any of claims 1-3, wherein the conductive material, the binder, and the negative electrode active material are provided in a weight ratio of 1:a:b, "a" ranges from about 1 to about 3, and "b" ranges from about 90 to about 99.
  5. The negative electrode for a rechargeable lithium battery of any of claims 1-4, wherein the additive is provided in an amount in a range of 0.1 wt% to 5 wt% with respect to a total weight of the negative electrode active material.
  6. The negative electrode for a rechargeable lithium battery of claim 5, wherein the additive is provided in an amount in a range of 0.2 wt% to 1 wt% with respect to the total weight of the negative electrode active material.
  7. The negative electrode for a rechargeable lithium battery of any of claims 1-6, wherein the negative electrode active material comprises at least one of a carbon-based negative electrode active material, a Si-based negative electrode active material, a Sn-based negative electrode active material, and a combination thereof.
  8. The negative electrode for a rechargeable lithium battery of any of claims 1-7, wherein the negative electrode active material comprises graphite.
  9. The negative electrode for a rechargeable lithium battery of any of claims 1-8, wherein the binder comprises at least one of a non-aqueous binder, an aqueous binder, a dry binder, and a combination thereof.
  10. The negative electrode for a rechargeable lithium battery of claim 9, wherein the aqueous binder comprises at least one of a styrene-butadiene rubber, a (meth)acrylated styrene-butadiene rubber, a (meth)acrylonitrile-butadiene rubber, a (meth)acrylic rubber, a butyl rubber, a fluoro rubber, polyethylene oxide, polyvinyl pyrrolidone, polyepichlorohydrine, polyphosphazene, poly(meth)acrylonitrile, an ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, a polyester resin, a (meth)acrylic resin, a phenol resin, an epoxy resin, polyvinyl alcohol, and a combination thereof.
  11. The negative electrode for a rechargeable lithium battery of any of claims 1-10, wherein the negative electrode active material layer has a pellet density in a range of 1.4 g/cc to 1.7 g/cc.
  12. The negative electrode for a rechargeable lithium battery of any of claims 1-11, wherein an adhesive strength between the negative electrode current collector and the negative electrode active material layer is in a range of 0.2 gf/mm to 0.4 gf/mm.
  13. A rechargeable lithium battery comprising: a positive electrode; a negative electrode; and an electrolyte solution, wherein the negative electrode comprises the negative electrode according to any of claims 1-12.
  14. The rechargeable lithium battery of claim 13, wherein the positive electrode comprises a positive electrode active material, and the positive electrode active material comprises 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 (Ni), cobalt (Co), manganese (Mn), aluminum (Al), boron (B), barium (Ba), calcium (Ca), cerium (Ce), chromium (Cr), iron (Fe), molybdenum (Mo), niobium (Nb), silicon (Si), strontium (Sr), magnesium (Mg), titanium (Ti), vanadium (V), tungsten (W), zirconium (Zr), or lanthanum (La), and a combination thereof, and X includes at least one of fluorine (F), sulfur (S), phosphorus (P), or chlorine (Cl).
  15. The rechargeable lithium battery of claim 13 or 14, wherein the positive electrode active material comprises lithium cobalt oxide (LiCoO 2 ).

Description

BACKGROUND The present disclosure relates to a negative electrode for a rechargeable lithium battery, and a rechargeable lithium battery including the negative electrode. The increasing presence of battery-powered electronics, such as, e.g., mobile phones, laptop computers, electric vehicles, and the like, drives a rise in demand for rechargeable batteries exhibiting high energy density and high capacity. Accordingly, improving the performance of rechargeable lithium batteries may be advantageous. Rechargeable lithium batteries include a positive electrode and a negative electrode, each including an active material that allows intercalation and deintercalation of lithium ions, and an electrolyte solution, and produce electrical energy from redox reactions that take place as lithium ions are intercalated into or deintercalated from the positive electrode and the negative electrode. SUMMARY The present disclosure describes a negative electrode for a rechargeable lithium battery exhibiting improved adhesive strength between a negative electrode active material layer and a negative electrode current collector. The present disclosure also describes a rechargeable lithium battery exhibiting improved heat resistance and safety. An embodiment of the present invention includes a negative electrode for a rechargeable lithium battery, wherein 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 binder, a conductive material, and an additive represented by Formula 1 or Formula 2 below. In Formula 1 above, R1 to R6 are each independently a hydrogen atom or a substituted or unsubstituted C1 to C10 alkyl group. In Formula 2 above, R7 to R14 are each independently a hydrogen atom or a substituted or unsubstituted C1 to C10 alkyl group. In an embodiment of the present invention, a rechargeable lithium battery includes a positive electrode, a negative electrode, and an electrolyte solution. The negative electrode is the negative electrode for a rechargeable lithium battery described above. BRIEF DESCRIPTION OF THE FIGURES The accompanying drawings are included to provide a further understanding of the present 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 principles of the present disclosure. In the drawings: FIG. 1 is a simplified conceptual view showing a rechargeable lithium battery according to example embodiments of the present disclosure;FIG. 2 is a cross-sectional view for describing a negative electrode plate according to example embodiments of the present disclosure; andFIGS. 3 to 6 are schematic views showing a rechargeable lithium battery according to example embodiments of the present disclosure, and FIG. 3 shows a cylindrical battery, FIG. 4 shows a prismatic battery, and FIGS. 5 and 6 show pouch-type batteries. DETAILED DESCRIPTION In order to sufficiently understand the configuration and effects of the present disclosure, example 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 implemented in various forms and variously modified. The example embodiments herein are provided so that this disclosure is thorough and complete and fully conveys the scope of the present disclosure to those skilled in the art. Herein, it is understood that when a component is referred to as being "on" another component, the component may be directly on another component, or an intervening third component may be present therebetween. In addition, in the drawings, thicknesses of components may be exaggerated for effectively describing technical contents. Like reference numerals refer to like elements throughout. The example embodiments described herein are explained with reference to the cross-sectional views and/or plan views as ideal example views of the present disclosure. In the drawing, the thicknesses of films and regions may be exaggerated for effective description of the technical contents. Thus, regions presented as an example in the drawings have general properties, and shapes of the exemplified areas are used to illustrate a specific shape of a device region. Therefore, this should not be construed as limited to the scope of the present disclosure. Although the terms such as first, second, and third are used to describe various components in various example embodiments herein, the components should not be limited to these terms. These terms are used only to distinguish one component from another component. Embodiments described and exemplified herein include complementary embodiments thereof. Terms used herein are not fo