Lithium air battery

Patent metadata

Field	Value
Publication number	US-2015236388-A1
Application number	US-201414182560-A
Country	US
Kind code	A1
Filing date	Feb 18, 2014
Priority date	Feb 18, 2014
Publication date	Aug 20, 2015
Grant date	—

Abstract

Provided is a lithium air battery in which a catalyst layer of a cathode contacting an electrolyte and using oxygen in the air as an active material is coupled to a membrane through which lithium ions pass, such that even though charge and discharge of the battery is repeated, the catalyst layer may not be detached, and a microporous polyolefin-based film is applied to the battery, such that a water-based electrolyte solvent may be prevented from being evaporated, thereby preventing performance deterioration due to repetition of the charge and discharge of the lithium air battery, and extending life span.

First claim

What is claimed is:

1 . A lithium air battery comprising:
a first electrode part including a lithium metal; a second electrode part including a gas diffusion layer of which one side contacts an air, a catalyst layer formed at the other side of the gas diffusion layer, and a membrane coupled to the catalyst layer so that lithium ions pass therethrough, and spaced apart from the first electrode part; and an electrolyte part provided between the first electrode part and the second electrode part.

2 . The lithium air battery of claim 1 , wherein the electrolyte part includes a separator closely adhered on one side of the first electrode part and containing an organic-based electrolyte, a solid electrolyte closely adhered on one side of the separator, and a water-based electrolyte provided between the solid electrolyte and the second electrode part.

3 . The lithium air battery of claim 1 , wherein the second electrode part further includes a microporous polyolefin-based film coupled on one side of the gas diffusion layer.

4 . The lithium air battery of claim 1 , further comprising:
a housing part including a first housing provided with a space part having an open upper side, and a second housing having an air accommodation part disposed at an upper portion of the first housing, sealing the space part of the first housing, and having an open lower side, and ventilation holes formed therein to communicate with the air accommodation part, wherein the first electrode part is accommodated into the space part of the first housing, the second electrode part is coupled to a lower side of the air accommodation part of the second housing to be spaced apart from the first electrode part and has the gas diffusion layer disposed on an upper side thereof and the membrane disposed on a lower side thereof, and the electrolyte part is provided in the space part of the first housing to be provided between the first electrode part and the second electrode part.

5 . The lithium air battery of claim 4 , wherein the electrolyte part includes a separator closely adhered on an upper side of the first electrode part and containing an organic-based electrolyte, a solid electrolyte closely adhered on an upper side of the separator, a water-based electrolyte provided between the solid electrolyte and the second electrode part, and an accommodation body provided on an upper side of the solid electrolyte and having an accommodation hole vertically penetrating therethrough, and
the accommodation body is disposed so that the solid electrolyte, the separator, and the first electrode part are closely adhered to the space part.

6 . The lithium air battery of claim 4 , wherein the housing part further includes a third housing interposed between the first housing and the second housing and having a fixing hole vertically penetrating therethrough so that the second electrode part is fixed to the fixing hole.

7 . The lithium air battery of claim 1 , wherein the membrane is a porous membrane containing a sulfonic acid group.

8 . The lithium air battery of claim 7 , wherein the membrane is made of a polyperfluorosulfonic acid (PFSA) resin having a porous material.

9 . The lithium air battery of claim 8 , wherein the membrane is closely adhered to the catalyst layer by heating and pressing the PFSA resin or by a dip-coating method using a PFSA resin solution.

Assignees

• Sk Innovation Co Ltd

Inventors

• Park Myoung Gu
• Kim Kyong Sik
• Chun Seong Ho
• Sun Hee Young
• Lee Suk Chin
• Sung Jung Moon

Classifications

• H01M2250/20

  Fuel cells in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2/0255

  Electricity · mapped topic

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• H01M12/08 Primary

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• H01M50/1385

  Hybrid cells · CPC title