Secondary battery including electrolyte additive

Patent metadata

Field	Value
Publication number	US-10056648-B2
Application number	US-201414554645-A
Country	US
Kind code	B2
Filing date	Nov 26, 2014
Priority date	Jul 10, 2012
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

Disclosed is a secondary battery including an electrode assembly, which includes a cathode, an anode and a separator interposed therebetween, and an electrolyte, wherein the anode includes lithium titanium oxide (LTO) as an anode active material and the electrolyte contains a phosphate-based compound as an additive.

First claim

The invention claimed is:

1. A secondary battery comprising an electrode assembly comprising a cathode, an anode and a separator interposed therebetween, and an electrolyte,
wherein the anode comprises lithium titanium oxide (LTO) as an anode active material, and
the electrolyte is a liquid electrolyte, which contains a phosphate-based compound as an additive, wherein the phosphate-based compound comprises at least one selected from the group consisting of a phosphate-based acrylate of Formula (1), a pyrophosphate-based acrylate of Formula (2) and a phosphate-based urethane acrylate:

where R 1 and R 2 are each independently hydrogen, methyl or F, and n is an integer of 1 to 20.

2. The secondary battery according to claim 1 , wherein the electrolyte contains 0.01 to 30% by weight of the phosphate-based compound based on the total weight of the electrolyte.

3. The secondary battery according to claim 1 , wherein the liquid electrolyte comprises an electrolyte serving as a plasticizer and a lithium salt.

4. The secondary battery according to claim 3 , wherein the electrolyte contains 0.01 to 30% by weight of the lithium salt based on the total weight of solid components included in the electrolyte.

5. A battery module comprising the secondary battery according to claim 1 as a unit cell.

6. A battery pack comprising the battery module according to claim 5 .

7. A device comprising the battery pack according to claim 6 .

8. The device according to claim 7 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle or a power storage system.

Assignees

• Lg Chemical Ltd

Inventors

• Ahn Kyoung-Ho
• Lee Chul-Haeng
• Yang Doo-Kyung
• Jeon Jong-Ho
• Kim Yoo-Seok
• Kim Min-Jung
• Lee Jung-Hoon
• Jung Yi-Jin

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• H01M10/0525

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

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title