All-solid-state batteries comprising composite electrode

Patent metadata

Field	Value
Publication number	US-12315875-B2
Application number	US-202017428311-A
Country	US
Kind code	B2
Filing date	May 6, 2020
Priority date	May 8, 2019
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

Disclosed is an all-solid-state battery comprising an electrode assembly and a solid electrolyte, wherein the electrode assembly comprises a structure in which plate-shaped electrodes are stacked; and the electrodes include a relatively high heat-generating first electrode and a relatively low heat-generating second electrode, wherein the first electrode is disposed in a center of the electrode assembly, the all-solid-state battery with improved performance by increasing the temperature of the battery without adding additional members.

First claim

The invention claimed is:

1. An all-solid-state battery comprising:
an electrode assembly; and
a solid electrolyte,
wherein
the electrode assembly comprises a structure in which a plurality of plate-shaped electrodes are stacked;
the plurality of electrodes include a first electrode and a second electrode, wherein the first electrode generates more heat than the second electrode, and wherein the first electrode is disposed in a center of the electrode assembly; and
an active material of the first electrode and an active material of the second electrode are negative electrode materials,
when the negative electrode active materials are listed in order from high heat generation to low heat generation, it is in the order of hard carbon, soft carbon, artificial graphite, natural graphite coated with artificial graphite, natural graphite, and silicon oxide,
wherein the active material of the first electrode is a relatively high heat generation negative electrode active material, and the active material of the second electrode is a relatively low heat generation negative electrode active material.

2. An all-solid-state battery comprising:
an electrode assembly; and
a solid electrolyte,
wherein
the electrode assembly comprises a structure in which a plurality of plate-shaped electrodes are stacked;
the plurality of plate shaped electrodes include a positive electrode and a negative electrode,
the positive electrode includes a first positive electrode and a second positive electrode, and the negative electrode includes a first negative electrode and a second negative electrode,
wherein the first positive electrode and the second positive electrode have a difference in the amount ratio of the solid electrolyte, and include a uniform positive active material,
wherein the first negative electrode and the second negative electrode have a difference in the amount ratio of the solid electrolyte, and include a uniform negative active material,
wherein the first positive electrode generates more heat than the second positive electrode, and wherein the first positive electrode is disposed in a center of the electrode assembly, and
wherein the first negative electrode generates more heat than the second negative electrode, and wherein the first negative electrode is disposed in a center of the electrode assembly,
the electrode assembly is a stacked type electrode assembly; and
wherein the first positive electrode, the second positive electrode, the first negative electrode, and the second negative electrode comprise a solid electrolyte, and
wherein an amount ratio of the solid electrolyte based on total solid content in the first positive electrode and the first negative electrode is higher than an amount ratio of the solid electrolyte based on total solid content in the second positive electrode and the second negative electrode, respectively.

3. An all-solid-state battery comprising:
an electrode assembly; and
a solid electrolyte,
wherein
the electrode assembly comprises a structure in which a plurality of plate-shaped electrodes are stacked;
the plurality of plate shaped electrodes include a positive electrode and a negative electrode,
the positive electrode includes a first positive electrode and a second positive electrode, and the negative electrode includes a first negative electrode and a second negative electrode,
wherein the first positive electrode and the second positive electrode have a difference in the amount ratio of the solid electrolyte, and include a uniform positive active material,
wherein the first negative electrode and the second negative electrode have a difference in the amount ratio of the solid electrolyte, and include a uniform negative active material,
wherein the first positive electrode generates more heat than the second positive electrode, and wherein the first positive electrode is disposed in a center of the electrode assembly, and
wherein the first negative electrode generates more heat than the second negative electrode, and wherein the first negative electrode is disposed in a center of the electrode assembly,
the electrode assembly is a laminated/stacked type electrode assembly or a stacked/folded type electrode assembly comprising a plurality of unit cells, the plurality of unit cells configured to have a first unit cell including the first electrode and a second unit cell including the second electrode; and
wherein the first positive electrode, the second positive electrode, the first negative electrode, and the second negative electrode comprise a solid electrolyte, and
wherein an amount ratio of the solid electrolyte based on total solid content in the first positive electrode and the first negative electrode is higher than an amount ratio of the solid electrolyte based on total solid content in the second positive electrode and the second negative electrode, respectively.

4. The all-solid-state battery according to claim 1 , wherein
the electrode assembly is a stacked type electrode assembly.

5. The all-solid-state battery according to claim 1 , wherein
the electrode assembly is a laminated/stacked type electrode assembly or a stacked/folded type electrode assembly comprising a plurality of unit cells; and
the plurality of unit cells are configured to have a first unit cell including the first electrode and a second unit cell including the second electrode.

6. The all-solid-state battery according to claim 5 , wherein each of the first unit cell and the second unit cell includes a uniform active material.

7. The all-solid-state battery according to claim 1 , wherein the first electrode and the second electrode are positive electrodes or negative electrodes, or positive electrodes and negative electrodes.

8. The all-solid-state battery according to claim 1 , wherein the solid electrolyte is a sulfide-based solid electrolyte, an oxide-based solid electrolyte or a polymer-based solid electrolyte.

9. The all-solid-state battery according to claim 1 , wherein a temperature of the first electrode is transferred to the second electrode to increase an internal temperature of the battery.

10. The all-solid-state battery according to claim 1 , wherein the all-solid-state battery comprising the electrode assembly comprising the first electrode and the second electrode has a larger capacity at subzero temperatures compared to an all-solid-state battery composed of a single-type electrode and having the same capacity at room temperature.

11. A battery pack comprising the all-solid-state battery according to claim 1 .

12. A device comprising the battery pack according to claim 11 , wherein the device is selected from a group consisting of mobile electronic devices, wearable electronic devices, tablet computers, laptop computers, electric vehicles, and power storage devices.

Assignees

• Lg Energy Solution Ltd

Inventors

• Ryu Ji Hoon
• Kim Eun Bee
• Lee Jung Pil
• Lee Suk Woo

Classifications

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title