Anode for lithium secondary battery and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-11380900-B2
Application number	US-201716341141-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Oct 12, 2016
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

Provided are an anode for a lithium secondary battery and a lithium secondary battery comprising the same. The anode comprises: a current collector; an anode active material layer disposed on the current collector; and a coating layer disposed on the anode active material layer and including an inorganic material and a binder polymer, wherein the binder polymer has a decomposition temperature of 100° C. to 400° C., and an elastic modulus of 1.0 GPa to 3.0 GPa at 220° C. or lower.

First claim

The invention claimed is:

1. An anode for a lithium secondary battery, comprising:
a current collector;
an anode active material layer disposed on the current collector; and
a coating layer disposed on the anode active material layer and including an inorganic material and a binder polymer represented by Chemical Formula 1,
wherein:
the binder polymer has a decomposition temperature of 100° C. to 400° C.,
the binder polymer has an elastic modulus of 1.0 GPa to 3.0 GPa at 220° C. or lower,
a weight ratio of the inorganic material:the binder polymer is 99:1 to 80: 20,
the binder polymer is included in an amount of 0.5 wt % to 10 wt % and the inorganic material is included in an amount of 1 wt % to 20 wt %, the wt % being based on a total weight of the anode active material layer and the coating layer,

in Chemical Formula 1,
Ar is a substituted or unsubstituted C6 to C30 aryl group, and
n is an integer ranging from 4 to 200.

2. The anode for a lithium secondary battery as claimed in claim 1 , wherein the binder polymer has a decomposition temperature of 300° C. to 350° C.

3. The anode for a lithium secondary battery as claimed in claim 1 , wherein the binder polymer has an elastic modulus of 2.0 GPa to 2.5 GPa at 220° C. or lower.

4. The anode for a lithium secondary battery as claimed in claim 1 , wherein the binder polymer is selected from an engineering plastic, a super engineering plastic, soluble polyimide, and a combination thereof.

5. The anode for a lithium secondary battery as claimed in claim 1 , wherein the coating layer has a thickness of 1 μm to 10 μm.

6. The anode for a lithium secondary battery as claimed in claim 1 , wherein the coating layer has a porosity of 30% to 70%.

7. The anode for a lithium secondary battery as claimed in claim 1 , wherein the inorganic material has a packing density of 1.0 g/cm 3 to 4.0 g/cm 3 .

8. A lithium secondary battery, comprising
the anode as claimed in claim 1 ;
a cathode;
an electrolyte; and
a separator.

9. A lithium secondary battery, comprising
the anode as claimed in claim 4 ;
a cathode;
an electrolyte; and
a separator.

10. A lithium secondary battery, comprising
the anode as claimed in claim 5 ;
a cathode;
an electrolyte; and
a separator.

11. A lithium secondary battery, comprising
the anode as claimed in claim 6 ;
a cathode;
an electrolyte; and
a separator.

12. A lithium secondary battery, comprising
the anode as claimed in claim 7 ;
a cathode;
an electrolyte; and
a separator.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Yongho
• Nam Junghyun
• KANG Seyeong

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

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

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M10/4235 Primary

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M4/622

  being polymers · CPC title