US-20260128271-A1 - ALL-SOLID-STATE BATTERY AND METHOD OF FABRICATING THE SAME

US20260128271A1US 20260128271 A1US20260128271 A1US 20260128271A1US-20260128271-A1

Abstract

Disclosed are all-solid-state batteries and fabrication methods thereof. The method of fabricating an all-solid-state battery includes 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-pressurization to pressurize the first electrode. The forming of the first electrode comprises performing a pre-pressurization in which the first electrode plate and the second electrode plate are pressurized while facing each other. The post-pressurization further includes cooling the second electrode plate.

Inventors

Won Gi Lee
Jinkyu CHOI

Assignees

SAMSUNG SDI CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20251024
Priority Date: 20241104

Claims (20)

1 . A method of fabricating an all-solid-state battery, the method comprising: 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-pressurization to pressurize the first electrode, wherein the forming the first electrode comprises performing a pre-pressurization in which the first electrode plate and the second electrode plate are pressurized while facing each other, and wherein the post-pressurization further comprises cooling the second electrode plate.
2 . The method as claimed in claim 1 , wherein: the forming the first mixture layer comprises coating a first positive electrode slurry on the first substrate, and the forming the second mixture layer comprises coating a second positive electrode slurry on the second substrate.
3 . The method as claimed in claim 1 , further comprising, before transferring the second mixture layer to the first mixture layer: performing a primary pressurization to pressurize the first electrode plate; and performing a primary pressurization to pressurize the second electrode plate.
4 . The method as claimed in claim 3 , wherein: the primary pressurization of the first electrode plate is performed such that the first electrode plate is pressurized at about 0.1 tons/cm to about 0.3 tons/cm, and the primary pressurization of the second electrode plate is performed such that the second electrode plate is pressurized at about 0.1 tons/cm to about 0.3 tons/cm.
5 . The method as claimed in claim 1 , further comprising removing the second substrate that is cooled after the post-pressurization.
6 . The method as claimed in claim 1 , wherein the first substrate and the second substrate comprise aluminum.
7 . The method as claimed in claim 1 , wherein the post-pressurization comprises pressurizing the first electrode at about 2.0 tons/cm to about 2.5 tons/cm.
8 . The method as claimed in claim 1 , wherein the pre-pressurization comprises arranging the first electrode plate and the second electrode plate to face each other and pressurizing the first electrode plate and the second electrode plate at about 0.3 tons/cm to about 0.5 tons/cm.
9 . The method as claimed in claim 1 , wherein: the first mixture layer comprises a first solid electrolyte, the second mixture layer comprises a second solid electrolyte, a weight ratio of the first solid electrolyte in the first mixture layer is about 10 wt % to about 18 wt % based on 100 wt % of the first mixture layer, and a weight ratio of the second solid electrolyte in the second mixture layer is about 20 wt % to about 40 wt % based on 100 wt % of the second mixture layer.
10 . The method as claimed in claim 1 , wherein cooling the second electrode plate uses liquid nitrogen.
11 . An all-solid-state battery, comprising: a positive electrode, the 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 comprises a first positive electrode active material and a first solid electrolyte, wherein the second mixture layer comprises a second positive electrode active material and a second solid electrolyte, and wherein a weight ratio of the first solid electrolyte in the first mixture layer is less than a weight ratio of the second solid electrolyte in the second mixture layer.
12 . The all-solid-state battery as claimed in claim 11 , wherein: the weight ratio of the first solid electrolyte in the first mixture layer is about 10 wt % to about 18 wt % based on 100 wt % of the first mixture layer, and the weight ratio of the second solid electrolyte in the second mixture layer is about 20 wt % to about 40 wt % based on 100 wt % of the second mixture layer.
13 . The all-solid-state battery as claimed in claim 11 , further comprising a coating layer between the first mixture layer and the second mixture layer, the coating layer comprising carbon.
14 . The all-solid-state battery as claimed in claim 13 , wherein a thickness of the coating layer is about 0 μm to about 3 μm.
15 . The all-solid-state battery as claimed in claim 11 , wherein a loading level on one side of a mixture layer comprising the first mixture layer and the second mixture layer is about 30 mg/cm 2 to about 35 mg/cm 2 .
16 . The all-solid-state battery as claimed in claim 11 , wherein the positive electrode current collector comprises aluminum.
17 . The all-solid-state battery as claimed in claim 16 , wherein the first solid electrolyte comprises a sulfide-based solid electrolyte.
18 . The all-solid-state battery as claimed in claim 17 , wherein the second solid electrolyte comprises a sulfide-based solid electrolyte.
19 . The all-solid-state battery as claimed in claim 11 , wherein the second mixture layer is treated with liquid nitrogen.
20 . The all-solid-state battery as claimed in claim 11 , wherein: one lateral surface of the second mixture layer is in contact with the first mixture layer, and another lateral surface of the second mixture layer is in contact with the solid electrolyte layer.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application claims priority to and the benefit of Korean Patent Application No. 10-2024-0154347, filed on Nov. 4, 2024, in the Korean Intellectual Property Office, the entire content of which is hereby incorporated by reference. BACKGROUND 1. Field Embodiments of the present disclosure relate to an all-solid-state battery and a method of fabricating the same. 2. Description of the Related Art Recently, with the rapid spread of battery using electronic devices, such as mobile phones, laptop computers, and electric vehicles, there is a rapidly increasing interest in rechargeable batteries having high energy density and high capacity. Therefore, intensive research has been conducted to improve performance of rechargeable lithium batteries. A rechargeable lithium battery includes a positive electrode, a negative electrode, and an electrolyte, which positive and negative electrodes include an active material in which intercalation and deintercalation are possible, and generates electrical energy caused by oxidation and reduction reactions if (e.g., when) lithium ions are intercalated and deintercalated. Among rechargeable lithium batteries, an all-solid-state battery refers to a battery in which all materials are solid, and, for example, a battery using a solid electrolyte. Such all-solid-state battery exhibits excellent safety due to no (or substantially no) risk of electrolyte leakage, and a thin-layered battery may readily be fabricated. Various methods to increase a capacity of the all-solid-state battery are being studied, and one approach to increasing capacity within a limited volume is to manufacture an electrode plate having high current density. SUMMARY An embodiment of the present disclosure provides an all-solid-state battery having high current density and a method of fabricating the same. An embodiment of the present disclosure provides an all-solid-state battery having a large coating amount of an active material layer and a method of fabricating the same. According to an embodiment of the present disclosure, a method of fabricating an all-solid-state 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-pressurization to pressurize the first electrode. The forming of the first electrode may include performing a pre-pressurization in which the first electrode plate and the second electrode plate are pressurized while facing each other. The post-pressurization may further include cooling the second electrode plate. According to an embodiment of the present disclosure, an all-solid-state battery may include: a positive electrode, the 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. A weight ratio of the first solid electrolyte in the first mixture layer may be less than a weight ratio of the second solid electrolyte in the second mixture layer. BRIEF DESCRIPTION OF DRAWINGS The accompanying drawings, together with the specification, illustrate embodiments of the subject matter of the present disclosure, and, together with the description, serve to explain principles of embodiments of the subject matter of the present disclosure. FIG. 1 is a cross-sectional view showing an all-solid-state battery according to an embodiment of the present disclosure. FIGS. 2A and 2B are flow charts showing a method of fabricating an all-solid-state battery according to an embodiment of the present disclosure. FIGS. 3 to 7 are cross-sectional views showing a method of fabricating an all-solid-state battery according to an embodiment of the present disclosure. DETAILED DESCRIPTION In order to sufficiently understand the configuration and effect of embodiments of the present disclosure, 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 example embodiments, and may be implemented in various suitable forms. Rather, the example embodiments are provided only to disclose the subject matter of the present disclosure and let those skilled in the art fully know the scope of the present disc