KR-102962593-B1 - METHOD OF MANUFACTURING GRANULE FOR ALL SOLID BATTERY ELECTRODE AND ALL SOLID BATTERY ELECTRODE

Abstract

(1) a step of coating a conductive material onto an active material; and (2) a step of spraying a binder onto the coated active material to produce a granule; a method for producing a granule for an all-solid-state battery electrode and an all-solid-state battery using the granule produced by the same are provided.

Inventors

• 김소희
• 권혜진
• 김정길
• 김기태
• 김태곤
• 김명수

Assignees

• 주식회사 엘지에너지솔루션

Dates

Publication Date

20260512

Application Date

20230316

Priority Date

20220317

Claims (12)

1. (1) A step of coating a conductive material onto an active material; and (2) a step of producing granules by spraying a binder onto the coated active material; and The above step (1) is to stir the active material and the conductive material in a mixing vessel in which the blade rotates at a peripheral speed of 20 to 100 m/s, and The above step (2) is performed in a container equipped with a main blade for stirring the active material and a sub-blade for crushing the aggregated active material particles, The above main blade is characterized by rotating at a speed of 100 to 300 rpm, and the above sub-blade is characterized by rotating at a speed of 1000 to 3000 rpm. Method for manufacturing granules for all-solid-state battery electrodes.
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6. In paragraph 1, A method for manufacturing granules for all-solid-state battery electrodes, characterized in that the granules are spherical particles having a diameter of 30 μm to 1000 μm.
7. In paragraph 1, A method for manufacturing granules for all-solid-state battery electrodes, characterized in that the granules have a porosity of 10 to 50%.
8. In paragraph 1, A method for manufacturing granules for all-solid-state battery electrodes, characterized in that the binder is selected from the group consisting of an acrylic binder, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyvinyl alcohol, starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polyimide, polyamideimide, polyethylene, polypropylene, ethylene-propylene-diene monomer, sulfonated EPDM, styrene butylene rubber, and fluororubber.
9. As an electrode for an all-solid-state battery comprising granules coated with a sulfide-based solid electrolyte, The above granules comprise an active material, a conductive material, and a binder, and The above granules are electrodes for an all-solid-state battery having a porosity of 10 to 50%.
10. In Paragraph 9, An electrode for an all-solid-state battery, characterized in that the above granules are spherical particles having a diameter of 30 μm to 1000 μm.
11. In Paragraph 9, The electrode for an all-solid-state battery is characterized in that the binder is selected from the group consisting of an acrylic binder, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyvinyl alcohol, starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polyimide, polyamideimide, polyethylene, polypropylene, ethylene-propylene-diene monomer, sulfonated EPDM, styrene butylene rubber, and fluororubber.
12. A solid-state battery comprising an electrode for a solid-state battery according to claim 9 as a positive or negative electrode.

Description

Method of Manufacturing Granules for All Solid Battery Electrodes and Electrodes for All Solid Battery The present invention relates to a method for manufacturing granules for an all-solid-state battery electrode and an electrode for an all-solid-state battery. Specifically, the present invention relates to a method for manufacturing granules for an all-solid-state battery electrode to improve the porosity of granule particles by preventing components within the granule particles from moving outward, and an electrode for an all-solid-state battery comprising granules manufactured thereby. Various batteries capable of overcoming the current limitations of lithium-ion batteries are being researched in terms of capacity, safety, output, scaling up, and miniaturization. Continuous research is being conducted in academia and industry on representative technologies, including metal-air batteries, which have a much larger theoretical capacity compared to lithium-ion batteries; all-solid-state batteries, which pose no risk of explosion in terms of safety; supercapacitors in terms of output; NaS batteries or RFBs (redox flow batteries) in terms of scale; and thin-film batteries in terms of miniaturization. Among these, all-solid-state batteries refer to batteries in which the liquid electrolyte used in conventional lithium-ion batteries is replaced with a solid one. Since flammable solvents are not used within the battery, there is no ignition or explosion caused by decomposition reactions of conventional electrolytes, thereby significantly improving safety. In addition, since Li metal or Li alloy can be used as the negative electrode material, there is an advantage of being able to dramatically improve the energy density relative to the mass and volume of the battery. In particular, among the solid electrolytes of all-solid-state batteries, inorganic solid electrolytes can be classified into sulfide-based and oxide-based types. Currently, sulfide-based solid electrolytes are the most technologically developed, and materials have been developed to possess ionic conductivity levels approaching those of organic electrolytes. Unlike conventional lithium secondary batteries that use liquid electrolytes, the above-mentioned all-solid-state battery uses a solid electrolyte, so the solid electrolyte cannot easily penetrate into the pores of the electrode, which can lead to problems such as physical contact. As a solution to this problem, methods have been studied such as manufacturing granules containing active material to secure pores on the outside of the granules, injecting a liquid solid electrolyte into the pores first, and then solidifying it. The above granules refer to particles composed of an active material, a conductive material, and a binder, and an electrode can be manufactured by laminating these granules onto an electrode current collector and applying heat and pressure (sheeting). However, the above granules were manufactured by drying the active material, conductive material, and binder in the form of a slurry. According to this conventional technology, the binder migrates to the outside of the granules during drying, resulting in the production of granule particles with a dense surface. Consequently, it is difficult for the electrolyte to penetrate into the granule particles, and thus a problem arises in which the cell resistance increases. FIG. 1 is a schematic diagram showing an apparatus for manufacturing granules for electrodes for all-solid-state batteries according to one embodiment of the present invention. FIG. 2 is a scanning electron microscope (SEM) image of granules for an electrode for an all-solid-state battery according to one embodiment of the present invention. FIG. 3 is a scanning electron microscope (SEM) image of granules for electrodes for all-solid-state batteries according to another embodiment of the present invention. Figure 4 is a scanning electron microscope (SEM) image of granules for electrodes for an all-solid-state battery according to another embodiment of the present invention. FIG. 5 is a photograph of a granule for an electrode for an all-solid-state battery according to one embodiment of the present invention. FIG. 6 is a photograph of granules for electrodes for an all-solid-state battery according to another embodiment of the present invention. FIG. 7 is a photograph of a granule for an electrode for an all-solid-state battery according to another embodiment of the present invention. All embodiments provided according to the present invention can be achieved by the following description. It should be understood that the following description describes preferred embodiments of the present invention and that the present invention is not necessarily limited thereto. Where measurement conditions and methods are not specifically described for the physical properties described in this specification, said physical properties are measured according to measurement conditions a