Lithium secondary battery and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10916752-B2
Application number	US-201816211454-A
Country	US
Kind code	B2
Filing date	Dec 6, 2018
Priority date	Apr 30, 2018
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

Disclosed is a lithium secondary battery provided with a separator, having improved thermal stability by including a micro-particle coating layer manufactured using Furan-based polymers, for example, polymers having polymer unit including furanyl or furoyl. The lithium secondary battery includes a cathode, an anode, an electrolyte, and a separator disposed between the cathode and the anode and including a coating layer including a micro-particle. The micro-particle includes the second polymer which may include cross-linked first polymer.

First claim

What is claimed is:

1. A lithium secondary battery comprising:
a cathode;
an anode;
an electrolyte; and
a separator disposed between the cathode and the anode and comprising a coating layer comprising a polymer admixture,
wherein the polymer admixture comprises a second polymer comprising a cross-linking structure of a first polymer comprising reacted monomers containing one or more furoyl groups, and wherein the first polymer comprises reacted furoyl ether methacrylate (FEEMA) monomers cross-linked by a first cross-linking agent.

2. The lithium secondary battery of claim 1 , wherein the polymer admixture comprises a micro-particle.

3. The lithium secondary battery of claim 2 , wherein the first cross-linking agent is ethylene glycol dimethacrylate.

4. The lithium secondary battery of claim 1 , wherein the first polymer comprises the first cross-linking agent in an amount of about 1 mol % or greater and about 5 mol % or less based on the total moles of the FEEMA monomers and the first cross-linking agent.

5. The lithium secondary battery of claim 1 , wherein the second polymer comprises a second cross-linking agent.

6. The lithium secondary battery of claim 5 , wherein the second cross-linking agent is bismaleimide.

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

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Iac In Nat Univ Chungnam

Inventors

• Koh Kiseok
• Yeo Yeolmae
• Oh Seung-Min
• Lee Yoon Sung
• Lee Kyung Jin
• Kim Hyojin

Classifications

• H01M10/0525 Primary

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

• H01M50/42

  Acrylic resins · CPC title

• H01M50/449

  having a layered structure · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title