Separator For Rechargeable Lithium Battery and Rechargeable Lithium Battery Including Same

Patent metadata

Field	Value
Publication number	US-2016141576-A1
Application number	US-201514842716-A
Country	US
Kind code	A1
Filing date	Sep 1, 2015
Priority date	Nov 19, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

A separator for a rechargeable lithium battery includes a substrate, an organic layer positioned on at least one side of the substrate and including an organic material and an inorganic layer positioned on at least one side of the substrate and including an inorganic material, wherein the organic material includes two or more kinds of organic particles having different particle sizes from each other.

First claim

What is claimed is:

1 . A separator for a rechargeable lithium battery, the separator comprising
a substrate; an organic layer positioned on at least one side of the substrate and including an organic material; and an inorganic layer positioned on at least one side of the substrate and including an inorganic material, wherein the organic material comprises two or more kinds of organic particles having different particle sizes from each other.

2 . The separator of claim 1 , wherein the organic material has a particle size of about 0.1 μm to about 5 μm.

3 . The separator of claim 1 , wherein the organic material comprises first organic particles and second organic particles having a larger particle size than the first organic particles, and
a ratio of particle sizes of the first organic particles to the second organic particles ranges from about 1:1.5 to about 1:7.

4 . The separator of claim 1 , wherein the organic material comprises first organic particles and second organic particles having a larger particle size than the first organic particles, and
a weight ratio of the first organic particles to the second organic particles ranges from about 10:90 to about 90:10.

5 . The separator of claim 1 , wherein the organic material comprises polyolefin, a polyolefin derivative, polyolefin wax, an acryl-based compound, or a combination thereof.

6 . The separator of claim 1 , wherein the organic material has a melting point of about 100° C. to about 130° C.

7 . The separator of claim 1 , wherein the organic material has a melting point of about 100° C. to about 130° C.

8 . The separator of claim 1 , wherein the organic layer has a packing density of about 0.5 mg/cc to about 0.95 mg/cc.

9 . The separator of claim 1 , wherein the inorganic material comprises inorganic particles comprising SiO 2 , Al 2 O 3 , Al(OH) 3 , AlO(OH), TiO 2 , BaTiO 2 , ZnO 2 , Mg(OH) 2 , MgO, Ti(OH) 4 , aluminum nitride (AlN), silicon carbide (SiC), boron nitride (BoN), or a combination thereof.

10 . The separator of claim 1 , wherein the inorganic material has a particle size of about 0.1 μm to about 5 μm.

11 . The separator of claim 1 , wherein the inorganic layer has a thickness of about 1 μm to about 10 μm, and
the organic layer has a thickness of about 1 μm to about 10 μm.

12 . The separator of claim 1 , wherein at least one of the organic layer and the inorganic layer further comprises a binder, and
the binder comprises a styrene-butadiene rubber (SBR), carboxylmethyl cellulose (CMC), polyvinylidene fluoride (PVdF), polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) copolymer, ethylene vinylacetate (EVA), hydroxyethyl cellulose (HEC), polyvinyl alcohol (PVA), polyvinylbutyral (PVB), an ethylene-acrylic acid copolymer, acrylonitrile, a vinyl acetate derivative, polyethylene glycol, an acryl-based rubber or a combination thereof.

13 . A rechargeable lithium battery comprising the separator of claim 1 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Eon-Mi
• Park Jong-Hwan
• Nam Jung-Hyun
• Choi Yeon-Joo
• Seok Hoon
• Goh Ae-Hui

Classifications

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M10/4235

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

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/451

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

• H01M50/434

  Ceramics · CPC title