Lithium secondary battery including separator with ceramic layer having first ceramic particle bonded to second ceramic particle and manufacturing method the same

Patent metadata

Field	Value
Publication number	US-11289768-B2
Application number	US-201916573037-A
Country	US
Kind code	B2
Filing date	Sep 17, 2019
Priority date	Dec 13, 2018
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

Disclosed are a lithium secondary battery including: a positive electrode; a negative electrode; an electrolyte; and a separator including a separator substrate and a ceramic layer formed on one surface or both surfaces of the separator substrate. Particularly, the ceramic layer may include a first ceramic particle including an epoxide group and a second ceramic particle including an amine group, and the first ceramic particle may be chemically bonded to the second ceramic particle.

First claim

What is claimed is:

1. A lithium secondary battery comprising:
a positive electrode;
a negative electrode;
an electrolyte; and
a separator comprising a separator substrate and a binder-free ceramic layer formed on one surface or both surfaces of the separator substrate,
wherein the binder-free ceramic layer comprises a first ceramic particle comprising epoxide groups and a second ceramic particle comprising amine groups, and
wherein the first ceramic particle chemically bonded to the second ceramic particle.

2. The lithium secondary battery according to claim 1 , wherein the binder-free ceramic layer has a thickness of about 0.5 to 2 μm.

3. The lithium secondary battery according to claim 1 , wherein each of the first ceramic particle and the second ceramic particle has a diameter of about 0.05 to 1.5 μm.

4. The lithium secondary battery according to claim 1 , wherein each of the first ceramic particle and the second ceramic particle is grafted by ester bonding.

5. The lithium secondary battery according to claim 1 , wherein each the first ceramic particle and the second ceramic particle comprises one or more one selected from the group consisting of Al 2 O 3 , TiO 2 , BaTiO 3 , Li 2 O, BaO, Na 2 O, Li 2 CO 3 , CaCO 3 , CaO, LiAlO 2 , SiO 2 , SiO, SnO, SnO 2 , PbO 2 , ZnO, P 2 O 5 , CuO, MoO, MgO, V 2 O 5 , Y 2 O 3 , B 2 O 3 , CeO 2 , Mn 3 O 4 , Sn 2 P 2 O 7 , Sn 2 B 2 O 5 , Sn 2 BPO 6 , Al(OH) 3 , Mg(OH) 2 and γ-AlO(OH).

6. A vehicle comprising a lithium secondary battery of claim 1 .

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Kim Dongjun
• Yeo Yeolmae
• Lee Yoon Sung
• Lee Jieun
• Park Sang Mok
• Oh Seung-Min

Classifications

• H01M10/0525 Primary

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

• H01M50/417

  Polyolefins · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/434 Primary

  Ceramics · 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