CN-122000484-A - All-solid battery and method of manufacturing the same

Abstract

An all-solid battery and a method of manufacturing the same are disclosed. The method of manufacturing the all-solid battery includes the steps of preparing a first substrate and a second substrate, preparing a first electrode plate by forming a first mixture layer on the first substrate, preparing a second electrode plate by forming a second mixture layer on the second substrate, forming a first electrode by transferring the second mixture layer of the second electrode plate to the first mixture layer of the first electrode plate, and performing a post-pressurizing step to pressurize the first electrode. The step of forming the first electrode includes performing a pre-pressurizing step in which the first electrode plate and the second electrode plate are pressurized while facing each other. The post-pressurizing step further includes cooling the second electrode plate.

Inventors

• LI YUANJI
• CUI BAOGUI

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260508

Application Date

20251027

Priority Date

20241104

Claims (20)

1. 1. A method of manufacturing an all-solid battery, the method comprising the steps of: preparing a first substrate and a second substrate; preparing a first electrode plate by forming a first mixture layer on the first substrate; Preparing a second electrode plate by forming a second mixture layer on the second substrate; Forming a first electrode by transferring the second mixture layer of the second electrode plate to the first mixture layer of the first electrode plate, and A post-pressurizing step is performed to pressurize the first electrode, Wherein the step of forming the first electrode includes performing a pre-pressurizing step in which the first electrode plate and the second electrode plate are pressurized while facing each other, and Wherein the post-pressurizing step further comprises cooling the second electrode plate.
2. 2. The method of claim 1, wherein, The step of forming the first mixture layer includes coating a first positive electrode slurry on the first substrate, and The step of forming the second mixture layer includes coating a second positive electrode slurry on the second substrate.
3. 3. The method of claim 1, prior to transferring the second mixture layer to the first mixture layer, the method further comprising the steps of: Performing a primary pressurizing step to pressurize the first electrode plate, and And performing a primary pressurizing step to pressurize the second electrode plate.
4. 4. The method of claim 3, wherein, Performing the primary pressurizing step of the first electrode plate such that the first electrode plate is pressurized at 0.1 ton/cm to 0.3 ton/cm, and The primary pressurizing step of the second electrode plate is performed such that the second electrode plate is pressurized at 0.1 ton/cm to 0.3 ton/cm.
5. 5. The method of claim 1, further comprising removing the cooled second substrate after the post-pressurizing step.
6. 6. The method of claim 1, wherein the first and second substrates comprise aluminum.
7. 7. The method of claim 1, wherein the post-pressurizing step comprises pressurizing the first electrode at 2.0 tons/cm to 2.5 tons/cm.
8. 8. The method of claim 1, wherein the pre-pressurizing step comprises facing the first and second electrode plates with each other and pressurizing at 0.3 ton/cm to 0.5 ton/cm.
9. 9. The method of claim 1, wherein, The first mixture layer includes a first solid electrolyte, The second mixture layer includes a second solid electrolyte, The weight ratio of the first solid electrolyte in the first mixture layer is 10 to 18wt%, and The weight ratio of the second solid electrolyte in the second mixture layer is 20wt% to 40wt%.
10. 10. The method of claim 1, wherein the second electrode plate is cooled using liquid nitrogen.
11. 11. An all-solid battery, the all-solid battery comprising: A positive electrode comprising a positive electrode current collector, a first mixture layer on the positive electrode current collector, and a second mixture layer on the first mixture layer; a solid electrolyte layer on the second mixture layer, and A negative electrode layer on the solid electrolyte layer, Wherein the first mixture layer includes a first positive electrode active material and a first solid electrolyte, Wherein the second mixture layer includes a second positive electrode active material and a second solid electrolyte, and Wherein the weight ratio of the first solid electrolyte in the first mixture layer is smaller than the weight ratio of the second solid electrolyte in the second mixture layer.
12. 12. The all-solid battery according to claim 11, wherein, The weight ratio of the first solid electrolyte in the first mixture layer is 10 to 18wt%, and The weight ratio of the second solid electrolyte in the second mixture layer is 20wt% to 40wt%.
13. 13. The all-solid battery of claim 11, further comprising a coating layer between the first mixture layer and the second mixture layer, the coating layer comprising carbon.
14. 14. The all-solid battery according to claim 13, wherein the thickness of the coating layer is equal to or less than 3 μm.
15. 15. The all-solid battery according to claim 11, wherein a load level at a side of the positive electrode current collector at a mixture layer including the first mixture layer and the second mixture layer is 15mg/cm 2 to 60mg/cm 2 .
16. 16. The all-solid battery of claim 11, wherein the positive electrode current collector comprises aluminum.
17. 17. The all-solid battery of claim 16, wherein the first solid electrolyte comprises a sulfide-based solid electrolyte.
18. 18. The all-solid battery of claim 17, wherein the first and second solid electrolytes comprise sulfide-based solid electrolytes.
19. 19. The all-solid battery according to claim 11, wherein the second mixture layer is treated with liquid nitrogen.
20. 20. The all-solid battery according to claim 11, wherein, One side surface of the second mixture layer is in contact with the first mixture layer, and The other side surface of the second mixture layer is in contact with the solid electrolyte layer.

Description

All-solid battery and method of manufacturing the same The present application claims priority from korean patent application No. 10-2024-0154347, filed on the korean intellectual property office at 11/4/2024, the entire contents of which are incorporated herein by reference. Technical Field The present disclosure relates to an all-solid battery and a method of manufacturing the same. Background Recently, with the rapid popularization of electronic devices using batteries, such as mobile phones, laptop computers, and electric vehicles, the demand for rechargeable lithium batteries having high energy density and high capacity has rapidly increased. Accordingly, intensive studies have been made to improve the performance of rechargeable lithium batteries. The rechargeable lithium battery includes a positive electrode, a negative electrode, and an electrolyte, the positive electrode and the negative electrode including active materials that can intercalate and deintercalate lithium ions, and generating electric energy caused by oxidation reactions and reduction reactions when the lithium ions are intercalated and deintercalated. Among rechargeable lithium batteries, all-solid-state batteries refer to batteries in which all materials are solid, particularly batteries using solid electrolytes. Such an all-solid battery exhibits excellent safety since there is no risk of electrolyte leakage, and a thin-layer battery is easily manufactured. Various methods of increasing the capacity of all-solid batteries are being studied, and one method of increasing the capacity within a limited volume is to manufacture an electrode plate having a high current density. Disclosure of Invention Embodiments of the present disclosure provide an all-solid battery having a high current density and a method of manufacturing the all-solid battery. Embodiments of the present disclosure provide an all-solid battery having a large coating amount of an active material layer and a method of manufacturing the all-solid battery. According to an embodiment of the present disclosure, a method of manufacturing an all-solid battery may include preparing a first substrate and a second substrate, preparing a first electrode plate by forming a first mixture layer on the first substrate, preparing a second electrode plate by forming a second mixture layer on the second substrate, forming a first electrode by transferring the second mixture layer of the second electrode plate to the first mixture layer of the first electrode plate, and performing a post-pressurizing step to pressurize the first electrode. The step of forming the first electrode may include performing a pre-pressurizing step in which the first electrode plate and the second electrode plate are pressurized while facing each other. The post-pressurizing step may further include cooling the second electrode plate. According to an embodiment of the present disclosure, an all-solid battery may include a positive electrode including a positive electrode current collector, a first mixture layer on the positive electrode current collector, and a second mixture layer on the first mixture layer, a solid electrolyte layer on the second mixture layer, and a negative electrode layer on the solid electrolyte layer. The first mixture layer may include a first positive electrode active material and a first solid electrolyte. The second mixture layer may include a second positive electrode active material and a second solid electrolyte. The weight ratio of the first solid electrolyte in the first mixture layer may be smaller than the weight ratio of the second solid electrolyte in the second mixture layer. Drawings Fig. 1 illustrates a cross-sectional view showing an all-solid battery according to an embodiment of the present disclosure. Fig. 2A and 2B show flowcharts illustrating methods of manufacturing an all-solid battery according to embodiments of the present disclosure. Fig. 3 to 7 show cross-sectional views illustrating a method of manufacturing an all-solid battery according to an embodiment of the present disclosure. Detailed Description In order that the construction and effects of the present disclosure may be fully understood, some embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted, however, that the present disclosure is not limited to the following exemplary embodiments, and may be implemented in various forms. Rather, the exemplary embodiments are provided only to disclose the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. In this specification, it will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may be present therebetween. In the drawings, the thickness of some components is exaggerated for the purpose of effectively explaining the technical contents. Like reference num