Soluble catalyst for lithium-air battery

Patent metadata

Field	Value
Publication number	US-2017149105-A1
Application number	US-201615190357-A
Country	US
Kind code	A1
Filing date	Jun 23, 2016
Priority date	Nov 20, 2015
Publication date	May 25, 2017
Grant date	—

Abstract

A soluble catalyst for a lithium-air battery is provided. The soluble catalyst including a redox mediator (RM) has an ionization energy of about 5.5 to 7.5 eV under vacuum or an oxidation potential of 3.0 to 4.0 V and is well dissolved in an electrolyte without reacting with the electrolyte. In addition, the soluble catalyst has a HOMO level in an original state (RM), which is less than a formation energy of lithium peroxide (Li 2 O 2 ) but maximally close to the formation energy, and has a HOMO level in an oxidized state (RM + ), which is greater than a HOMO level of the electrolyte.

First claim

What is claimed is:

1 . A catalyst for a lithium-air battery, comprising:
a redox mediator that is dissolved in an electrolyte, wherein an ionization energy of the redox mediator is of about 5.5 to 7.5 eV under vacuum state.

2 . The catalyst of claim 1 , wherein an oxidation potential of the redox mediator is greater than an equilibrium potential of lithium peroxide (Li 2 O 2 ).

3 . The catalyst of claim 2 , wherein the oxidation potential of the redox mediator is about 3.0 to 4.0 V.

4 . The catalyst of claim 1 , wherein the electrolyte is triethylene glycol dimethyl ether (TEGDME) or dimethyl sulfoxide (DMSO).

5 . The catalyst of claim 1 , wherein the redox mediator does not react with the electrolyte.

6 . The catalyst of claim 1 , wherein a highest occupied molecular orbital (HOMO) level of the redox mediator is less than a formation energy of Li 2 O 2 .

7 . The catalyst of claim 6 , wherein an ionization energy of the redox mediator is about 4.5 to 6.0 eV in the electrolyte.

8 . The catalyst of claim 1 , wherein a highest occupied molecular orbital (HOMO) level of the redox mediator in an oxidized state is greater than a HOMO level of the electrolyte.

9 . The catalyst of claim 1 , wherein the redox mediator is 5,10-dimethylphenazine (DMPZ), 1,5-naphthalenediamine (NDA), 4,N,N-trimethylaniline (TMA), or 1-phenylpyrrolidine (PPD).

10 . A lithium-air battery comprising:
a catalyst of claim 1 .

11 . A vehicle comprising a lithium-air battery of claim 10 .

Assignees

• Hyundai Motor Co Ltd
• Univ Seoul Nat R & Db Found

Inventors

• Kim Won Keun
• Ryu Kyoung Han
• Lim Hee Dae
• Kang Ki Suk
• Lee Byung Ju

Classifications

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M2220/20

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

• B60L50/64

  Constructional details of batteries specially adapted for electric vehicles · 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

• B01J31/0244 Primary

  with nitrogen contained as ring member in aromatic compounds or moieties, e.g. pyridine · CPC title