KR-20260066395-A - ALL SOLID BATTERY AND MANUFACTURING METHOD OF THE SAME

Abstract

The present invention relates to a method for manufacturing an all-solid-state battery, comprising the steps of: preparing a first substrate and a second substrate; forming a first electrode plate; forming a second electrode plate; transferring the second electrode plate onto the first electrode plate to form a first electrode; and a post-pressing step of pressing the first electrode, wherein the step of forming the first electrode includes a pre-pressing step of pressing the first electrode plate and the second electrode plate together, and the post-pressing step further includes a step of cooling the second electrode plate.

Inventors

• 이원기
• 최진규

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260512

Application Date

20241104

Claims (20)

1. Step of preparing the first and second materials; A step of preparing a first electrode plate by forming a first composite layer on the first substrate; A step of preparing a second electrode plate by forming a second composite layer on the second substrate; A step of transferring the second composite layer of the second electrode plate onto the first composite layer of the first electrode plate to form a first electrode; and It includes a post-pressure step of applying pressure to the first electrode, and The step of forming the first electrode includes a full-pressure step of pressing the first electrode plate and the second electrode plate together. A method for manufacturing an all-solid-state battery, wherein the above post-pressurization step further includes a step of cooling the second electrode plate.
2. In Article 1, Forming the first composite layer includes applying a first anode slurry onto the first substrate, and A method for manufacturing an all-solid-state battery, wherein forming the second composite layer comprises applying a second anode slurry onto the second substrate.
3. In Article 1, Before the above transfer, A first pressing step for the first electrode plate that presses the first electrode plate; and A method for manufacturing an all-solid-state battery, further comprising a first pressing step for the second electrode plate that presses the second electrode plate.
4. In Paragraph 3, The first pressing step for the first electrode plate above pressurizes the first electrode plate to a pressure of 0.1 ton/cm or more and 0.3 ton/cm or less, and A method for manufacturing an all-solid-state battery, wherein the first pressing step for the second electrode plate presses the second electrode plate to a pressure of 0.1 ton/cm or more and 0.3 ton/cm or less.
5. In Article 1, A method for manufacturing an all-solid-state battery, further comprising the step of removing the second substrate cooled after the post-pressure step.
6. In paragraph 1, A method for manufacturing an all-solid-state battery, wherein the first and second substrates above comprise aluminum.
7. In paragraph 1, A method for manufacturing an all-solid-state battery, wherein the above post-pressure step comprises pressurizing the first electrode to a pressure of 2.0 ton/cm or more and 2.5 ton/cm or less.
8. In paragraph 1, A method for manufacturing an all-solid-state battery, wherein the above-mentioned pressurization step comprises the step of pressing the first electrode plate and the second electrode plate together at a pressure of 0.3 ton/cm or more and 0.5 ton/cm or less.
9. In paragraph 1, The above first composite layer comprises a first solid electrolyte, and The above second composite layer includes a second solid electrolyte, and The weight ratio of the first solid electrolyte in the first composite layer is 10 wt% or more and 18 wt% or less, and A method for manufacturing an all-solid-state battery, wherein the weight ratio of the second solid electrolyte in the second composite layer is 20 wt% or more and 40 wt% or less.
10. In paragraph 1, A method for manufacturing an all-solid-state battery, wherein the step of cooling the second electrode plate above uses liquid nitrogen.
11. The anode layer comprises an anode current collector, a first composite layer on the anode current collector, and a second composite layer on the first composite layer; A solid electrolyte membrane on the second composite layer above; and It includes a cathode layer on the solid electrolyte membrane above, and The first composite layer comprises a first positive active material and a first solid electrolyte, and The second composite layer comprises a second positive active material and a second solid electrolyte, and A solid-state battery in which the weight ratio of the first solid electrolyte in the first composite layer is smaller than the weight ratio of the second solid electrolyte in the second composite layer.
12. In Paragraph 11, The weight ratio of the first solid electrolyte in the first composite layer is 10 wt% or more and 18 wt% or less, and An all-solid-state battery in which the weight ratio of the second solid electrolyte in the second composite layer is 20 wt% or more and 40 wt% or less.
13. In Paragraph 11, A solid-state battery further comprising a coating film containing carbon interposed between the first composite layer and the second composite layer.
14. In Paragraph 11, An all-solid-state battery having a coating film thickness of 0 µm or more and 3 µm or less.
15. In Paragraph 11, The sum of the loading levels of the composite layer including the first composite layer and the second composite layer is 30 mg/ cm² or more and 35 mg/ cm² or less based on the cross-section, All-solid-state battery.
16. In Paragraph 11, The above positive current collector is an all-solid-state battery comprising aluminum.
17. In Paragraph 16, The above-mentioned first solid electrolyte is a sulfide-based solid electrolyte, in an all-solid-state battery.
18. In Paragraph 17, The above first and second solid electrolytes comprise a sulfide-based solid electrolyte, all-solid-state battery.
19. In Paragraph 11, The above second composite layer is a liquid nitrogen-treated all-solid-state battery.
20. In Paragraph 11, One side of the second composite layer is in contact with the first composite layer, and The other side of the second composite layer is in contact with the solid electrolyte membrane, in an all-solid-state battery.

Description

All Solid Battery and Manufacturing Method of the Same The present invention relates to an all-solid-state battery and a method for manufacturing the same. Recently, accompanied by the rapid proliferation of battery-powered electronic devices such as mobile phones, laptop computers, and electric vehicles, the demand for high-energy-density, high-capacity rechargeable batteries is rapidly increasing. Accordingly, research and development to improve the performance of lithium-ion batteries is actively underway. A lithium secondary battery is a battery comprising a positive electrode and a negative electrode containing an active material capable of lithium ion intercalation and deintercalation, and an electrolyte, which produces electrical energy through oxidation and reduction reactions when lithium ions are intercalated or deintercalated from the positive and negative electrodes. Among lithium-ion batteries, all-solid-state batteries are batteries composed entirely of solid materials, specifically referring to batteries that use a solid electrolyte. These all-solid-state batteries offer excellent safety due to the absence of the risk of electrolyte leakage and have the advantage of being easy to manufacture in a thin form factor. Various methods are being reviewed to increase the battery capacity of all-solid-state batteries, and fabricating electrode plates with high current density is being considered as a way to increase capacity within a limited volume. FIG. 1 is a flowchart for explaining a method for manufacturing an all-solid-state battery according to one embodiment of the present invention. FIG. 2 is a flowchart illustrating a method for manufacturing an all-solid-state battery according to one embodiment of the present invention. FIGS. 3 to 7 are drawings for explaining a method for manufacturing an all-solid-state battery according to an embodiment of the present invention. In order to fully understand the structure and effects of the present invention, preferred embodiments of the present invention are described with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and various modifications can be made. The description of these embodiments is provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. In this specification, when a component is described as being on another component, it means that it may be formed directly on the other component or that a third component may be interposed between them. Additionally, in the drawings, the thicknesses of the components are exaggerated for the effective description of the technical content. Throughout the specification, parts indicated by the same reference numeral represent the same components. Unless otherwise specified in this specification, the singular form may also include the plural. Additionally, unless otherwise specified, "A or B" may mean "comprising A, comprising B, or comprising A and B." As used herein, "comprises" and/or "comprising" do not exclude the presence or addition of one or more other components 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 an electrode for an all-solid-state battery comprising a current collector; an active material layer on the current collector; and a solid electrolyte layer on the active material layer, the amount of coating on the active material layer on the substrate can be increased in a design that increases the capacity of the battery in a limited volume by fabricating a high current density electrode plate. By using an all-solid-state battery and an all-solid-state battery manufacturing method according to one embodiment of the present invention, the amount of active material coating on the battery can be increased, the desired thickness and quality can be standardized, and the current density performance of the battery can be increased. FIG. 1 is a cross-sectional view of an all-solid-state battery (10) according to one embodiment of the present invention. FIG. 1 is a cross-sectional view of an all-solid-state battery (10) according to one embodiment of the present invention. Referring to FIG. 1, an all-solid-state battery (10) according to one embodiment includes a positive electrode layer (100), a negative electrode layer (200) facing the positive electrode layer (100), and a solid electrolyte layer (300) disposed between the positive electrode layer (100) and the negative electrode layer (200). However, the all-solid-state battery (10) may further include an additional functional layer, such as an adhesion-enhancing layer, disposed between the positive electrode layer (100) and the solid electrolyte layer (300) or between the negative electro