Self-supporting ceramic separator for electrochemical device and electrochemical device comprising same

Patent metadata

Field	Value
Publication number	US-2026066462-A1
Application number	US-202419103154-A
Country	US
Kind code	A1
Filing date	Apr 15, 2024
Priority date	Apr 19, 2023
Publication date	Mar 5, 2026
Grant date	—

Abstract

A self-standing ceramic separator and an electrochemical device including the same are provided. The self-standing ceramic separator includes first inorganic particles having a sheet shape and second inorganic particles, which is a zeolite-based inorganic matter, in an appropriate content and arrangement, thereby having an improved heat resistance, and providing improved safety of a battery by preventing an electrical short-circuit between electrodes and a high cell lifespan characteristic.

First claim

What is claimed is:

1 . A self-standing ceramic separator for an electrochemical device, the self-standing ceramic separator comprising:
first inorganic particles; second inorganic particles; and a polymer binder, wherein the first inorganic particles have a sheet shape, and an aspect ratio of the first inorganic particles is 10 or more and 300 or less.

2 . The self-standing ceramic separator of claim 1 , wherein one surface of the first inorganic particles and one surface of the separator are arranged to face each other.

3 . The self-standing ceramic separator of claim 1 , wherein the self-standing ceramic separator comprises:
a first layer in which a weight of the first inorganic particles comprised therein is greater than a weight of the second inorganic particles comprised therein; and a second layer which is provided on one surface of the first layer and in which a weight of the second inorganic particles comprised therein is greater than a weight of the first inorganic particles comprised therein.

4 . The self-standing ceramic separator of claim 3 , wherein a surface that is opposite to the one surface of the first layer is provided to face the negative electrode.

5 . The self-standing ceramic separator of claim 1 , wherein the first inorganic particles comprise one selected from a group consisting of boron nitride, boehmite, kaoline, and a combination thereof.

6 . The self-standing ceramic separator of claim 1 , wherein
the second inorganic particle is a zeolite-based inorganic matter, the second inorganic particle comprises a pore having a diameter of 0.5 nm or more and 0.9 nm or less, and the pore of the second inorganic particle is substituted with metal ions.

7 . The self-standing ceramic separator of claim 1 , wherein an average grain diameter D50 of the second inorganic particles is 1 μm or less.

8 . The self-standing ceramic separator of claim 3 , wherein a thickness of the second layer is 1 μm or more and 3 μm or less.

9 . The self-standing ceramic separator of claim 1 , wherein a content of the first inorganic particles is 5 parts by weight or more and 10 parts by weight or less with respect to 100 parts by weight of the separator.

10 . The self-standing ceramic separator of claim 1 , wherein the polymer binder is an acrylic binder, a polyvinylidene-based binder, or a combination thereof.

11 . The self-standing ceramic separator of claim 1 , wherein a thickness of the separator is 7 μm or more and 15 μm or less.

12 . The self-standing ceramic separator of claim 1 , wherein a permeability of the separator is 170 sec/100 cc or less.

13 . The self-standing ceramic separator of claim 1 , wherein a resistance of the separator is 0.6Ω or more and 1.2Ω or less.

14 . An electrochemical device comprising:
a positive electrode; a negative electrode; and the separator of claim 1 between the positive electrode and the negative electrode.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Yeong Ha
• Jeong So Mi
• Yoon Yeo Ju
• Kim Seong Jun
• Bang Ji Hyun

Classifications

• H01M10/0525

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

• H01M50/449

  having a layered structure · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title