Cathode catalyst for metal-air battery, method for manufacturing same, and metal-air battery comprising same

Patent metadata

Field	Value
Publication number	US-2016204445-A1
Application number	US-201414889143-A
Country	US
Kind code	A1
Filing date	Aug 29, 2014
Priority date	Sep 17, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

The present invention relates to a cathode catalyst for a metal-air battery, a method for manufacturing the same, and a metal-air battery comprising the same. More specifically, the present invention relates to a cathode catalyst for a metal-air battery, a method for manufacturing the same, and a metal-air battery comprising the same having an improved storage capacity for charging/discharging and an increased charge-discharge cycle lifetime. The cathode catalyst is characterized by having a layered perovskite structure, and including lanthanum and nickel oxides. The cathode catalyst including the layered perovskite is used for manufacturing a cathode for a metal-air battery, and a metal-air battery is provided using the same. As a result, the charge-discharge polarisation of the metal-air battery is decreased, the storage capacity is increased, and the charge-discharge cycle lifetime can be improved.

First claim

1 . A cathode catalyst for a metal-air battery, comprising a lanthanum-nickel oxide having a layered perovskite structure.

2 . The cathode catalyst of claim 1 , wherein the metal is selected from the group consisting of zinc (Zn), aluminum (Al), magnesium (Mg), iron (Fe), calcium (Ca), and sodium (Na).

3 . The cathode catalyst of claim 1 , wherein a molar ratio of the lanthanum to the nickel is 1.95 through 2.05:1.

4 . The cathode catalyst of claim 1 , wherein part of the lanthanum is replaced with a substitute of one or more species selected from calcium (Ca) or strontium (Sr).

5 . A method for manufacturing a cathode catalyst for a metal-air batter, the method comprising:
a first step of preparing a mixture by dissolving a lanthanum and nickel nitrate in ethylene glycol and distilled water; a second step of preparing a sol by mixing the mixture prepared in the first step with citric acid; a third step of forming a gel by heating the sol prepared in the second step; a fourth step of pyrolizing the gel formed in the third step; and a fifth step of preparing a cathode catalyst by thermal-treating a material obtained in the fourth step.

6 . The method of claim 5 , further comprising cooling and crashing the cathode catalyst.

7 . The method of claim 5 , wherein the ethylene glycol of 5 to 50 parts by weight is added with respect to 100 parts by weight of the distilled water.

8 . The method of claim 5 , wherein the citric acid added is one to five times the number of moles of the lanthanum and nickel nitrate added in the first step.

9 . The method of claim 5 , wherein in the third step, the sol is heated at 60° C. to 80° C.

10 . The method of claim 5 , wherein in the fourth step, the gel is pyrolized at 200° C. to 300° C.

11 . The method of claim 5 , wherein the temperature of the thermal treatment in the fourth step is 500° C. to 1000° C.

12 . A cathode for a metal-air battery comprising carbon, a binder, and a cathode catalyst for a metal-air battery as set forth in claim 1 .

13 . The cathode of claim 12 , wherein the carbon is selected from the group consisting of sorts of carbon black, sorts of graphite, sorts of graphene, sorts of active carbon, and sorts of carbon fiber.

14 . The cathode of claim 12 , wherein the binder is selected from the group consisting of vinylidene fluoride, polyacrylonitrile, polymethylmethacrylate, and polytetrafluoroethylene and styrene butadiene rubber-based polymer.

15 . The cathode of claim 12 , wherein the metal-air battery includes an anode selected from the group zinc (Zn), aluminum (Al), magnesium (Mg), iron (Fe), calcium (Ca), and sodium (Na); a porous separator; and an alkali electrolyte.

16 . The cathode of claim 15 , wherein the alkali electrolyte is selected from the group consisting of KOH, NaOH, and LiOH.

17 . The cathode of claim 15 , wherein the separator is selected from the group consisting of glass fiber, polyester, Teflon, polyethylene, polypropylene, and polytetrafluoroethylene (PTFE).

Assignees

• Korea Energy Research Inst

Inventors

• Jung Kyu-Nam
• Lee Jong-Won
• Shin Kyung-Hee
• Jin Chang-Soo
• Lee Bum-Suk
• Jeon Myung-Seok
• Jeon Jae-Deok
• Yeon Sun-Hwa
• Shim Joon-Mok
• Yang Jung-Hoon
• Jung Jong-Hyuk

Classifications

• C01G53/82

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M2004/8689

  Positive electrodes · CPC title

• H01M4/9033 Primary

  Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites · CPC title

• H01M12/08

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

• H01M4/9016

  Oxides, hydroxides or oxygenated metallic salts · CPC title