KR-20260067041-A - SOLID ELECTROLYTE, CATHODE COMPRISING THE SAME, AND METHOD FOR MAUNFACTURING THE SAME

Abstract

The present invention relates to a cathode for an all-solid-state battery. More specifically, the cathode comprises an active material particle and a cluster comprising a plurality of solid electrolyte particles, wherein the plurality of solid electrolyte particles are in contact with the active material particle, and each of the plurality of solid electrolyte particles may include a linear carbon-based conductive material dispersed therein. The active material particle of the cluster and a first solid electrolyte particle among the plurality of solid electrolyte particles are electrically connected to each other, and a second solid electrolyte particle among the plurality of solid electrolyte particles and the first solid electrolyte particle are in contact with each other, so that an electrical path may be formed by 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.

Inventors

• 김한슬
• 안선혁
• 김동수

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260512

Application Date

20241105

Claims (20)

1. A cluster comprising active material particles and a plurality of solid electrolyte particles, wherein The plurality of solid electrolyte particles above come into contact with the active material particles, and Each of the above plurality of solid electrolyte particles comprises a linear carbon-based conductive material dispersed therein, and The active material particle of the cluster and the first solid electrolyte particle among the plurality of solid electrolyte particles are electrically connected to each other, Among the plurality of solid electrolyte particles, the second solid electrolyte particle and the first solid electrolyte particle are in contact with each other, so that an electrical path is formed by 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. Anode for all-solid-state batteries.
2. In paragraph 1, Each of the above plurality of solid electrolyte particles is, A matrix comprising a sulfide-based solid electrolyte; and a linear carbon-based conductive material provided within the matrix, Anode for all-solid-state batteries.
3. In paragraph 2, The above sulfide-based solid electrolyte is an argyrodite-type sulfide-based solid electrolyte represented by Li 7-a M a PS 6-c X c (0≤a≤2, 0≤c≤2), and The above X is F, Br, Cl, or a combination thereof, and The above M is candium (Sc), yttrium (Y), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Co), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pd), platinum (Pt), copper (Cu), silver (Ag), gold (Au), zinc (Zn), cadmium (Cd), mercury (Hg), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), arsenic (As), antimony (Sb), bismuth (Bi), or a combination thereof, Anode for all-solid-state batteries.
4. In paragraph 1, The above linear carbon-based conductive material comprises at least one selected from the group consisting of carbon nanotubes (CNT), carbon nanofibers (CNF), and vapor-grown carbon fibers (VGCF). Anode for all-solid-state batteries.
5. In paragraph 1, The above active material particles include an oxide-based positive electrode active material, Anode for all-solid-state batteries.
6. In paragraph 1, The weight ratio of the active material particles to the solid electrolyte particles is 70:30 to 90:10, Anode for all-solid-state batteries.
7. In paragraph 1, A positive electrode for an all-solid-state battery, wherein the average particle size of each of the plurality of solid electrolyte particles is 0.5 μm to 2 μm.
8. A positive current collector, a positive active material layer on the positive current collector; Solid electrolyte layer; and Includes a cathode, The above positive active material layer comprises positive active material particles and a first solid electrolyte particle, and The first solid electrolyte particle comprises a linear carbon-based conductive material dispersed therein, and The above linear carbon-based conductive material is configured to pass through the interior of the first solid electrolyte particle and form an electrical path from a first point to a second point on the surface of the first solid electrolyte particle. All-solid-state battery.
9. In paragraph 8, The thickness of the above positive active material layer is 100 μm to 1000 μm, All-solid-state battery.
10. In paragraph 8, The above solid electrolyte layer includes second solid electrolyte particles, The above second solid electrolyte particles are in which the above linear carbon-based conductive material is omitted, All-solid-state battery.
11. In Paragraph 10, The average particle size of the first solid electrolyte is smaller than the average particle size of the second solid electrolyte. All-solid-state battery.
12. In paragraph 8, The content of the first solid electrolyte is 10 to 30 weight% with respect to the total weight of the positive electrode active material layer, All-solid-state battery.
13. In paragraph 8, The above cathode comprises a cathode current collector; and a coating layer on the cathode current collector, and The above coating layer includes a first particle and a second particle, and The first particle above is amorphous carbon, crystalline carbon, porous carbon, or a combination thereof, and The second particle comprises gold, platinum, palladium, silicon, silver, aluminum, bismuth, tin, zinc, or a combination thereof. All-solid-state battery.
14. In Paragraph 13, It further includes a lithium metal layer between the above-mentioned negative current collector and the above-mentioned coating layer, and The above lithium metal layer comprises lithium metal or an alloy of lithium metal, All-solid-state battery.
15. Mixing an electrolyte precursor and a linear carbon-based conductive material; and The method includes manufacturing solid electrolyte particles by heat-treating a mixture, The above linear carbon-based conductive material is configured to pass through the interior of the solid electrolyte particle and form an electrical path from a first point to a second point on the surface of the solid electrolyte particle. Method for manufacturing solid electrolyte.
16. In paragraph 15, The above linear carbon-based conductive material comprises at least one selected from the group consisting of carbon nanotubes (CNT), carbon nanofibers (CNF), and vapor-grown carbon fibers (VGCF). Method for manufacturing solid electrolyte.
17. In paragraph 15, Mixing the above electrolyte precursor and the above linear carbon-based conductive material is performed through ball milling, Method for manufacturing solid electrolyte.
18. In paragraph 15, The above electrolyte precursor is, A compound comprising a sulfur precursor; a phosphorus precursor; and a halide precursor Method for manufacturing solid electrolyte.
19. In paragraph 15, The above heat treatment is performed at a temperature of 100℃ to 800℃, Method for manufacturing solid electrolyte.
20. In paragraph 15, The content of the linear carbon-based conductive material is 1% to 5% by weight based on the total weight of the mixture, Method for manufacturing solid electrolyte.

Description

Solid Electrolyte, Cathode Comprising the Same, and Method for Manufacturing the Same This is about all-solid-state batteries. Recently, driven by industrial demands, the development of batteries with high energy density and safety is actively underway. For example, lithium-ion batteries are being commercialized not only in the fields of information and communication devices but also in the automotive sector. In the automotive sector, safety is considered particularly important because it is directly related to human life. Recently, all-solid-state batteries have been proposed in which the liquid electrolyte of lithium-ion batteries is replaced with a solid electrolyte. By not using flammable organic dispersion media, all-solid-state batteries can significantly reduce the likelihood of fire or explosion in the event of a short circuit. Therefore, such all-solid-state batteries can possess excellent safety. FIG. 1 is a plan view of an all-solid-state battery according to embodiments of the present invention. Figure 2 is a cross-sectional view along the line A-A' of Figure 1. FIG. 3 is a cross-sectional view of the enlarged region M of FIG. 2, intended to explain the positive active material layer according to embodiments of the present invention. FIG. 4 shows a cluster according to one embodiment of the present invention. FIG. 5 shows solid electrolyte particles according to one embodiment of the present invention. FIG. 6 is an enlarged view of a positive electrode active material layer according to one embodiment of the present invention. FIG. 7 is a cross-sectional view of an all-solid-state battery according to one embodiment of the present invention. FIG. 8 is a cross-sectional view of an all-solid-state battery according to one embodiment of the present invention. FIG. 9 is a cross-sectional view of an all-solid-state battery according to one embodiment of the present invention. The present inventive concept described below is subject to various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present inventive concept to specific embodiments and should be understood to include all modifications, equivalents, or substitutions that fall within the scope of the description of the present inventive concept. The terms used below are used merely to describe specific embodiments and are not intended to limit the creative concept. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the following, terms such as “comprising” or “having” are intended to indicate the existence of the features, numbers, steps, actions, components, parts, components, materials, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, components, materials, or combinations thereof. As used below, “ ” may be interpreted as “and” or “or” depending on the context. Unless otherwise specified in this specification, singular forms may also include plural forms. Additionally, unless otherwise specified, “A or B” may mean “comprising A, comprising B, or comprising A and B.” As used in this specification, “comprises” and/or “comprising” do not exclude the presence or addition of one or more other components in addition to the mentioned components. In this specification, “combination of these” may mean a mixture of components, a laminate, a composite, a copolymer, an alloy, a blend, and a reaction product, etc. In the drawings, thicknesses have been enlarged or reduced to clearly represent various layers and regions. Throughout the specification, the same reference numerals have been used for similar parts. Throughout the specification, when a part such as a layer, film, region, or plate is described as being “on” or “above” another part, this includes not only cases where it is directly above another part but also cases where there is another part in between. Throughout the specification, terms such as “first,” “second,” etc., may be used to describe various components, but the components should not be limited by these terms. In this specification and drawings, components having substantially the same functional configuration are referred to by the same reference numerals to avoid redundant descriptions. In the present disclosure, the “size” of a particle is, for example, the “particle diameter” of the particle. The “particle diameter” of the particle represents the average diameter when the particle is spherical and represents the average major axis length when the particle is non-spherical. The particle diameter of the particle can be measured using a particle size analyzer (PSA). The “particle diameter” of the particle is, for example, the average particle diameter. The average particle diameter is, for example, the median particle