Secondary battery including electrolyte additive

Patent metadata

Field	Value
Publication number	US-9246189-B2
Application number	US-201313866440-A
Country	US
Kind code	B2
Filing date	Apr 19, 2013
Priority date	Apr 19, 2012
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

Disclosed is a secondary battery including a cathode, an anode, and an electrolyte including a lithium salt and a non-aqueous organic solvent, wherein the electrolyte includes an electrolyte additive to be decomposed at 4.5 V or higher to less than 5.5 V vs. reduction voltage of Li + .

First claim

The invention claimed is:

1. A secondary battery comprising a cathode, an anode, and an electrolyte consisting of a lithium salt, a non-aqueous organic solvent, and an electrolyte additive, wherein the electrolyte additive decomposes at 4.5 V or higher to less than 5.5 V vs. reduction voltage of Li + ,
wherein an amount of the electrolyte additive is in a range of 0.1 to 1 wt % based on a total weight of the electrolyte and the electrolyte additive consists of diacetoxy biphenyl or cyclohexyl benzene,
wherein at least one of the cathode and the anode has a surface layer formed by decomposition of the electrolyte additive, and
wherein the cathode comprises a spinel-structure lithium metal oxide as a cathode active material is represented by Formula 2 below,
Li x Ni y Mn 2−y O 4   (2)

wherein 0.9≦x≦1.2 and 0.4≦y≦0.5, and
the anode comprises an anode active material represented by Formula 4 below:
Li a Ti b O 4   (4)

wherein 0.1≦a≦4 and 0.2≦b≦4.

2. The secondary battery according to claim 1 , wherein an amount of the electrolyte additive is in a range of 0.1 to 0.6 wt % based on a total weight of the electrolyte.

3. The secondary battery according to claim 1 , wherein the lithium metal oxide is LiNi 0.5 Mn 1.5 O 4 or LiNi 0.4 Mn 1.6 O 4 .

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

5. A battery pack comprising the battery module according to claim 4 .

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

7. The device according to claim 6 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a system for storing power.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Younkyoung
• Park Tae Jin
• Kim Daehong

Classifications

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M10/052

  Li-accumulators · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M10/0564 Primary

  the electrolyte being constituted of organic materials only · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title