Rechargeable lithium battery and method of fabricating same

Patent metadata

Field	Value
Publication number	US-9859541-B2
Application number	US-201314135324-A
Country	US
Kind code	B2
Filing date	Dec 19, 2013
Priority date	Apr 10, 2013
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

In an aspect, a rechargeable lithium battery that includes a positive electrode; negative electrode; a separator interposed between the positive electrode and the negative electrode and including a porous substrate and a coating layer formed on at least one side of the porous substrate; and an electrolyte including a lithium salt, a non-aqueous organic solvent, and an additive is provided.

First claim

What is claimed is:

1. A rechargeable lithium battery, comprising
a positive electrode comprising a positive active material, a first binder, and a conductive material;
a negative electrode comprising a negative active material and a second binder;
a separator interposed between the positive electrode and the negative electrode and including a porous substrate having a coating layer formed on at least one side of the porous substrate; and
an electrolyte including a lithium salt, a non-aqueous organic solvent, and an additive,
wherein the coating layer comprises a fluorine-based polymer, and a ceramic, and the ceramic has an average particle diameter of about 50 μm to about 500μm, and
the additive comprises a compound represented by Chemical Formula 1:

wherein,
R 1 to R 4 are each independently a substituted or unsubstituted C1 to C20 alkoxy group, a substituent represented by Chemical Formula 2 or a substituent represented by Chemical Formula 3, and
at least one of the R 1 to R 4 is the substituted or unsubstituted C1 to C20 alkoxy group, and at least other one of the R 1 to R 4 is a substituent represented by Chemical Formula 2 or a substituent represented by Chemical Formula 3:
*—(CH 2 ) n —N═C═O  Chemcial Formula 2

wherein, n is an integer ranging from 0 to 10, and

wherein, n is an integer ranging from 0 to 10,
wherein the ceramic comprises Al 2 O 3 , MgO, TiO 2 , Al(OH) 3 , Mg(OH) 2 , Ti(OH) 4 , or a combination thereof, and
wherein a bond between at least one alkoxy group of the compound represented by Chemical Formula 1 and at least one of the first binder and the second binder or the coating layer is present.

2. A rechargeable lithium battery, comprising
a positive electrode comprising a positive active material, a first binder, and a conductive material;
a negative electrode comprising a negative active material and a second binder;
a separator interposed between the positive electrode and the negative electrode and including a porous substrate having a coating layer formed on at least one side of the porous substrate; and
an electrolyte including a lithium salt and a non-aqueous organic solvent
wherein the coating layer comprises a fluorine-based polymer, and a ceramic, and an additive and the coating layer has a thickness of about 1 μm to about 10 μm, and the additive comprises a compound represented by Chemical Formula 1 :

wherein,
R 1 to R 4 are each independently a substituted or unsubstituted C1 to C20 alkoxy group, a substituent represented by Chemical Formula 2 or a substituent represented by Chemical Formula 3, and
at least one of the R 1 to R 4 is the substituted or unsubstituted C1 to C20 alkoxy group, and at least other one of the R 1 to R 4 is a substituent represented by Chemical Formula 2or a substituent represented by Chemical Formula 3:
*—(CH 2 ) n —N═C═O  Chemcial Formula 2

wherein, in Chemical Formula 2, n is an integer ranging from 0 to 10, and

wherein, in Chemical Formula 3, n is an integer ranging from 0 to 10,
wherein the ceramic comprises Al 2 O 3 , MgO, Al(OH) 3 , Mg(OH) 2 , Ti(OH) 4 , or a combination thereof, and
wherein a bond between at least one alkoxy group of the compound represented by Chemical Formula 1 and at least one of the first binder and the second binder or the coating layer is present.

3. The rechargeable lithium battery of claim 1 , wherein the porous substrate comprise a polyolefin resin.

4. The rechargeable lithium battery of claim 1 , wherein the fluorine-based polymer comprises polyvinylidenefluoride (PVdF), a polyvinylidenefluoride-hexafluoropropylene (PVdF-HFP) copolymer, or a combination thereof.

5. The rechargeable lithium battery of claim 1 , wherein the ceramic is Al 2 O 3 , Al(OH) 3 , Mg(OH) 2 , Ti(OH) 4 , or a combination thereof.

6. The rechargeable lithium battery of claim 1 , wherein the coating layer has a thickness of about 1 μm to about 8 μm.

7. The rechargeable lithium battery of claim 1 , wherein the coating layer further comprises a heat-resistance resin comprising an aramid resin, a polyamideimide resin, a polyimide resin, or a combination thereof.

8. The rechargeable lithium battery of claim 1 , wherein the additive comprises a compound represented by Chemical Formula 4, a compound represented by Chemical Formula 5, or a combination thereof:

9. The rechargeable lithium battery of claim 1 , wherein the compound represented by the above Chemical Formula 1 is included in an amount of about 1 part to about 15 parts by weight based on 100 parts by weight of the non-aqueous organic solvent.

10. The rechargeable lithium battery of claim 1 , wherein the additive further comprises fluoroethylene carbonate, vinylethylene carbonate, propane sultone, succinonitrile, adiponitrile, or a combination thereof.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Bae Tae-Hyun
• Shin Woo-Cheol
• Han Sang-Il
• Kim Sang-Hoon
• Kim Duck-Hyun
• Chung Byung-Joo
• Nam Jung-Hyun
• Jeong Myung-Hwan
• Yu Jung-Yi
• Lee Seung-Tae
• Lee Mi-Hyun
• Lee Eon-Mi
• Lee Ha-Rim
• Kim Moon-Sung
• Cho In-Haeng
• Cho E-Rang
• Choi Dong-Myung
• Egorov Vladimir
• Khasanov Makhmut
• Shatunov Pavel Alexandrovich
• Tereshchenko Alexey
• Chernyshov Denis

Classifications

• H01M50/446 Primary

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

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M50/449

  having a layered structure · CPC title

• H01M2/1653

  Electricity · mapped topic

• Y10T29/49115

  including coating or impregnating · CPC title