Lithium secondary battery and binder for anode of the lithium secondary battery

Patent metadata

Field	Value
Publication number	US-10734651-B2
Application number	US-201816038054-A
Country	US
Kind code	B2
Filing date	Jul 17, 2018
Priority date	Dec 1, 2017
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

Disclosed herein is a lithium secondary battery capable of improving an output characteristic, a life characteristic, and stability of electrode adhesion by using a binder containing dopamine-polymerized heparin in an anode containing silicon. In accordance with an aspect of the present disclosure, a lithium secondary battery includes: a cathode; an anode; a separation film disposed between the cathode and the anode; and an electrolyte, wherein the anode comprises a binder containing carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), and polysaccharide including a sulfonate functional group and an amine group.

First claim

What is claimed is:

1. A lithium secondary battery comprising:
a cathode;
an anode;
a separation film disposed between the cathode and the anode; and
an electrolyte,
wherein the anode comprises a binder containing carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), and the below chemical compound ( 1 ) of more than 0 wt % and 20 wt % or less (1).

2. The lithium secondary battery according to claim 1 , wherein the binder comprises the CMC of more than 0 wt % and 10 wt % or less.

3. The lithium secondary battery according to claim 1 , wherein the binder comprises the SBR of more than 0 wt % and 10 wt % or less.

4. The lithium secondary battery according to claim 1 , wherein the binder comprises the CMC and the SBR of more than 0 wt % and 10 wt % or less.

5. The lithium secondary battery according to claim 1 , wherein the anode comprises graphite and silicon.

6. A binder for an anode of a lithium secondary battery, comprising:
carboxymethyl cellulose (CMC) of more than 0 wt % and 10 wt % or less;
styrene-butadiene rubber (SBR) of more than 0 wt % and 10 wt % or less; and
the below chemical compound (1) of more than 0 wt % and 20 wt % or less (1).

7. The binder according to claim 6 , wherein a total content of the CMC and the SBR is more than 0 wt % and 10 wt % or less.

8. The binder according to claim 6 , wherein a content of the CMC is more than 0 wt % and 5 wt % or less.

9. The binder according to claim 6 , wherein a content of the SBR is more than 0 wt % and 5 wt % or less.

10. The binder according to claim 6 , wherein a content of the chemical compound (1) is more than 0 wt % and 10 wt % or less.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Univ Incheon Ind Acad Coop

Inventors

• Oh Seung-Min
• Yeo Yeolmae
• Koh Kiseok
• Lee Yoon Sung
• Kim Tae-Hyun
• Lee Kukjoo
• Mun Junyoung

Classifications

• H01M50/417

  Polyolefins · CPC title

• H01M4/622 Primary

  being polymers · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title