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CN-122000286-A - All-solid battery, positive electrode, and method for manufacturing solid electrolyte

CN122000286ACN 122000286 ACN122000286 ACN 122000286ACN-122000286-A

Abstract

An all-solid battery, a positive electrode, and a method of manufacturing a solid electrolyte are disclosed. The positive electrode includes clusters including active material particles and solid electrolyte particles. The solid electrolyte particles are in contact with the active material particles. Each of the solid electrolyte particles includes a linear carbon-based conductive material dispersed in the solid electrolyte particles. The active material particles of the clusters are electrically connected to first solid electrolyte particles among the solid electrolyte particles. The second solid electrolyte particles and the first solid electrolyte particles of the solid electrolyte particles are in contact with each other to form an electrical path through the linear carbon-based conductive material of the first solid electrolyte particles and the linear carbon-based conductive material of the second solid electrolyte particles.

Inventors

  • Jin Hanse
  • AN SHANHE
  • JIN DONGZHU

Assignees

  • 三星SDI株式会社

Dates

Publication Date
20260508
Application Date
20251031
Priority Date
20241105

Claims (20)

  1. 1. A positive electrode for an all-solid battery, the positive electrode comprising: A cluster including active material particles and a plurality of solid electrolyte particles, Wherein the plurality of solid electrolyte particles are in contact with the active material particles, Wherein at least one of the plurality of solid electrolyte particles comprises a linear carbon-based conductive material dispersed in the solid electrolyte particles, Wherein the active material particles of the cluster are electrically connected to a first solid electrolyte particle of the plurality of solid electrolyte particles, and Wherein a second solid electrolyte particle of the plurality of solid electrolyte particles and the first solid electrolyte particle are in contact with each other to form an electrical path through the linear carbon-based conductive material of the first solid electrolyte particle and the linear carbon-based conductive material of the second solid electrolyte particle.
  2. 2. The positive electrode according to claim 1, wherein at least one of the plurality of solid electrolyte particles comprises a matrix comprising a sulfide-based solid electrolyte, and The linear carbon-based conductive material is in the matrix.
  3. 3. The positive electrode according to claim 2, wherein the sulfide-based solid electrolyte includes a sulfur silver germanium ore-based solid electrolyte represented by Li 7-a-c M a PS 6-c X c , wherein 0≤a≤2 and 0≤c≤2, Wherein X comprises at least one of F, br and Cl, and Wherein M comprises at least one of scandium, yttrium, titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, ruthenium, osmium, cobalt, rhodium, iridium, nickel, palladium, platinum, copper, silver, gold, zinc, cadmium, mercury, aluminum, gallium, indium, thallium, silicon, germanium, tin, lead, arsenic, antimony, and bismuth.
  4. 4. The positive electrode of claim 1, wherein the linear carbon-based conductive material comprises at least one of carbon nanotubes, carbon nanofibers, and vapor grown carbon fibers.
  5. 5. The positive electrode according to claim 1, wherein the active material particles comprise an oxide-based positive electrode active material.
  6. 6. The positive electrode according to claim 1, wherein a weight ratio of the active material particles to the solid electrolyte particles is in a range of 70:30 to 90:10.
  7. 7. The positive electrode according to claim 1, wherein an average particle diameter of each of the plurality of solid electrolyte particles is in a range of 0.5 μm to 2 μm.
  8. 8. An all-solid battery, the all-solid battery comprising: A positive electrode including a positive electrode current collector and a positive electrode active material layer on the positive electrode current collector; A solid electrolyte layer, and A negative electrode that is electrically connected to the electrode, Wherein the positive electrode active material layer includes positive electrode active material particles and first solid electrolyte particles, Wherein the first solid electrolyte particles include a linear carbon-based conductive material dispersed in the first solid electrolyte particles, and Wherein the linear carbon-based conductive material is configured to penetrate the first solid electrolyte particles to form an electrical path between a first location and a second location on a surface of the first solid electrolyte particles.
  9. 9. The all-solid battery according to claim 8, wherein the thickness of the positive electrode active material layer is in the range of 80 μm to 1,000 μm.
  10. 10. The all-solid battery according to claim 8, wherein the solid electrolyte layer includes second solid electrolyte particles, and Wherein the second solid electrolyte particles do not include the linear carbon-based conductive material.
  11. 11. The all-solid battery according to claim 10, wherein an average particle diameter of the first solid electrolyte particles is smaller than an average particle diameter of the second solid electrolyte particles.
  12. 12. The all-solid battery according to claim 8, wherein the amount of the first solid electrolyte particles is in the range of 10wt% to 30wt% of the total weight of the positive electrode active material layer.
  13. 13. The all-solid battery of claim 8, wherein the negative electrode comprises: negative electrode current collector, and A coating layer on the negative electrode current collector, Wherein the coating comprises first particles and second particles, Wherein the first particles include at least one of amorphous carbon, crystalline carbon, and porous carbon, and Wherein the second particles comprise at least one of gold, platinum, palladium, silicon, silver, aluminum, bismuth, tin, and zinc.
  14. 14. The all-solid battery according to claim 13, further comprising a lithium metal layer between the negative electrode current collector and the coating layer, Wherein the lithium metal layer comprises lithium metal or a lithium metal alloy.
  15. 15. A method of manufacturing a solid electrolyte, the method comprising the steps of: mixing an electrolyte precursor and a linear carbon-based conductive material to obtain a mixture, and Heat-treating the mixture to prepare solid electrolyte particles, Wherein the linear carbon-based conductive material is configured to penetrate the solid electrolyte particles to form an electrical path between a first location and a second location on a surface of the solid electrolyte particles.
  16. 16. The method of claim 15, wherein the linear carbon-based conductive material comprises at least one of carbon nanotubes, carbon nanofibers, and vapor grown carbon fibers.
  17. 17. The method of claim 15, wherein the step of mixing the electrolyte precursor and the linear carbon-based conductive material is performed via a ball milling process.
  18. 18. The method of claim 15, wherein the electrolyte precursor comprises at least one of a sulfur precursor, a phosphorus precursor, and a halide precursor.
  19. 19. The method of claim 15, wherein the step of heat treating the mixture is performed at a temperature in the range of 100 ℃ to 800 ℃.
  20. 20. The method of claim 15, wherein the amount of the linear carbon-based conductive material ranges from 1wt% to 5wt% relative to the total weight of the mixture.

Description

All-solid battery, positive electrode, and method for manufacturing solid electrolyte The present application claims priority from korean patent application No. 10-2024-0155280 filed on the korean intellectual property office on day 11 and 5 of 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field Embodiments of the present disclosure relate to all-solid-state batteries. Background The development of high energy density and safe batteries driven by industry demands is increasing. For example, lithium ion batteries are commercialized not only in formation-related and communication devices, but also in the automotive industry. In the automotive industry, safety is emphasized because it is directly related to the safety of human life. All-solid batteries typically include a solid electrolyte in place of a liquid electrolyte. Since the all-solid battery does not use a flammable organic dispersion medium, the possibility of ignition or explosion can be significantly reduced even in the event of a short circuit. Therefore, the all-solid battery can have high stability. Disclosure of Invention Example embodiments of the present disclosure provide a solid electrolyte in which a conductive material is dispersed inside particles to improve electron conductivity and ion conductivity of a positive electrode. Example embodiments of the present disclosure provide a positive electrode in which particles are uniformly mixed to improve electrode performance. According to example embodiments of the present disclosure, a positive electrode for an all-solid battery may include a cluster including active material particles and a plurality of solid electrolyte particles. The plurality of solid electrolyte particles may be in contact with the active material particles. Each of the plurality of solid electrolyte particles may include a linear carbon-based conductive material dispersed in the solid electrolyte particles. The active material particles of the cluster may be electrically connected to a first solid electrolyte particle of the plurality of solid electrolyte particles. The second solid electrolyte particles and the first solid electrolyte particles of the plurality of solid electrolyte particles may be in contact with each other to form an electrical path through the linear carbon-based conductive material of the first solid electrolyte particles and the linear carbon-based conductive material of the second solid electrolyte particles. According to example embodiments of the present disclosure, an all-solid battery may include a positive electrode including a positive electrode current collector and a positive electrode active material layer on the positive electrode current collector, a solid electrolyte layer, and a negative electrode. The positive electrode active material layer may include positive electrode active material particles and first solid electrolyte particles. The first solid electrolyte particles may include a linear carbon-based conductive material dispersed in the first solid electrolyte particles. The linear carbon-based conductive material may be configured to penetrate the first solid electrolyte particles to form an electrical path between a first location and a second location on a surface of the first solid electrolyte particles. According to example embodiments of the present disclosure, a method of manufacturing a solid electrolyte may include the steps of mixing an electrolyte precursor and a linear carbon-based conductive material to obtain a mixture, and heat treating the mixture to prepare solid electrolyte particles. The linear carbon-based conductive material may be configured to penetrate the solid electrolyte particles to form an electrical path between a first location and a second location on the surface of the solid electrolyte particles. Drawings Fig. 1 illustrates a plan view showing an all-solid battery according to an example embodiment of the present disclosure. Fig. 2 shows a cross-sectional view taken along line A-A' of fig. 1. Fig. 3 shows an enlarged cross-sectional view of the portion "M" depicted in fig. 2, showing a positive electrode active material layer according to an example embodiment of the present disclosure. Fig. 4 illustrates a diagram showing clusters according to an example embodiment of the present disclosure. Fig. 5 shows a diagram illustrating solid electrolyte particles according to an example embodiment of the present disclosure. Fig. 6 shows an enlarged view illustrating a positive electrode active material layer according to an example embodiment of the present disclosure. Fig. 7 illustrates a cross-sectional view showing an all-solid battery according to an example embodiment of the present disclosure. Fig. 8 illustrates a cross-sectional view showing an all-solid battery according to an example embodiment of the present disclosure. Fig. 9 illustrates a cross-sectional view showing an all-solid battery accor