Separator for secondary battery and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2016149184-A1
Application number	US-201514925919-A
Country	US
Kind code	A1
Filing date	Oct 28, 2015
Priority date	Nov 21, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

A separator includes an inorganic coating layer including an inorganic oxide filler and a binder having a core-shell particle structure mixed therein and coated on one surface or both surfaces of the separator. A nonaqueous lithium secondary battery includes: a positive electrode; a negative electrode on the positive electrode; and the separator between the positive electrode and the negative electrode.

First claim

What is claimed is:

1 . A separator for a secondary battery comprising:
an inorganic coating layer comprising an inorganic oxide filler and a binder having a core-shell particle structure mixed therein and coated on one surface or both surfaces of the separator.

2 . The separator of claim 1 , wherein the binder comprises:
a core comprising an inorganic particle; and a shell comprising an organic material and an inorganic material and coated on particle surfaces of the core.

3 . The separator of claim 1 , wherein the binder has one selected from a substantially spherical shape, a plate-like shape, and an amorphous shape.

4 . The separator of claim 1 , wherein the inorganic oxide filler comprises an inorganic oxide selected from the group consisting of SiO 2 , Al 2 O 3 , Al(OH) 3 , AlO(OH), TiO 2 , BaTiO 3 , ZnO 2 , Mg(OH) 2 , and mixtures thereof, and the inorganic oxide filler comprises one selected from the group consisting of aluminum nitride (AlN), silicon carbide (SiC), boron nitride (BoN), and mixtures thereof.

5 . The separator of claim 1 , wherein the inorganic oxide filler has an average particle diameter in a range of about 0.1 μm to about 5 μm.

6 . The separator of claim 2 , wherein the core has an average particle diameter in a range of about 0.01 μm to about 2.0 μm.

7 . The separator of claim 2 , wherein the core comprises one selected from SiO 2 , Al 2 O 3 , Al(OH) 3 , AlO(OH), and mixtures thereof.

8 . The separator of claim 2 , wherein the shell is adhered to the particle surfaces of the core.

9 . The separator of claim 2 , wherein the shell comprises a silane-based compound.

10 . The separator of claim 2 , wherein the shell is included in the binder in an amount of 10% by weight based on the total weight of the core.

11 . The separator of claim 2 , wherein the shell has a thickness of 50 nm or less.

12 . The separator of claim 2 , wherein the shell is surface-modified by a coupling agent.

13 . The separator of claim 1 , wherein the inorganic oxide filler and the binder are coupled to each other to have a point contact structure.

14 . The separator of claim 1 , wherein the inorganic coating layer further comprises an organic binder filling internal spaces between the inorganic oxide filler and the binder.

15 . A nonaqueous lithium secondary battery comprising:
a positive electrode; a negative electrode on the positive electrode; and the separator of claim 1 between the positive electrode and the negative electrode.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Nam Junghyun
• Seok Hoon
• Kim Gain

Classifications

• H01M50/446 Primary

  Composite material consisting of a mixture of organic and inorganic materials · CPC title

• H01M50/431 Primary

  Inorganic material · CPC title

• H01M2/1686

  Electricity · mapped topic

• H01M10/052

  Li-accumulators · CPC title

• H01M2/1646 Primary

  Electricity · mapped topic