Lithium ion conducting protective film and method of use

Patent metadata

Field	Value
Publication number	US-9705167-B2
Application number	US-201314099794-A
Country	US
Kind code	B2
Filing date	Dec 6, 2013
Priority date	Jun 19, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A lithium ion conducting protective film is produced using a layer-by-layer assembly process. The lithium ion conducting protective film is assembled on a substrate by a sequential exposure of the substrate to a first poly(ethylene oxide) (PEO) layer including a cross-linking silane component on the first side of the substrate, a graphene oxide (GO) layer on the first PEO layer, a second poly(ethylene oxide) (PEO) layer including a cross-linking silane component on the GO layer and a poly(acrylic acid) (PAA) layer on the second PEO layer, The film functions as a lithium ion conducting protective film that isolates the lithium anode from the positive electrochemistry of the cathode in a lithium-air battery, thereby preventing undesirable lithium dendrite growth.

First claim

The invention claimed is:

1. A lithium ion conducting protective film comprising:
a lithium anode protective layer comprising a graphene oxide (GO) layer;
a lithium ion conductive layer; and
a cross-linking silane component to cross-link between the lithium anode protective layer and the lithium ion conductive layer of the film.

2. The lithium ion conducting protective film of claim 1 , wherein the lithium ion conductive layer comprises a poly(ethylene oxide) (PEO) layer.

3. The lithium ion conducting protective film of claim 1 , wherein the cross-linking silane component is selected from the group consisting of monofunctional silane, bifunctional silane, multifunctional silane, trialkoxysilane and trichlorosilane.

4. The lithium ion conducting protective film of claim 1 , further comprising a poly(acrylic acid) (PAA) layer.

5. The lithium ion conducting protective film of claim 1 , further comprising:
a substrate including a first side and a second side; and
at least one tetralayer disposed on the first side of the substrate, the at least one tetralayer comprising the lithium anode protective layer, the lithium ion conductive layer and the cross-linking silane component to cross-link the lithium anode protective layer and the lithium ion conductive layer of the film.

6. The lithium ion conducting protective film of claim 5 , wherein the substrate is a poly(propylene) membrane.

7. The lithium ion conducting protective film of claim 5 , wherein the at least one tetralayer further comprises:
a first lithium ion conductive layer comprising poly(ethylene oxide) (PEO) including a cross-linking silane component, disposed on the first side of the substrate;
the lithium anode protective layer comprising a graphene oxide (GO) layer disposed on the first lithium ion conductive layer;
a second lithium ion conductive layer comprising poly(ethylene oxide) (PEO) including a cross-linking silane component, disposed on the GO layer; and
a poly(acrylic acid) (PAA) layer disposed on the second lithium ion conductive layer.

8. The lithium ion conducting protective film of claim 7 , wherein the first lithium ion conductive layer and the second lithium ion conductive layer further comprise lithium bis(oxalate)borate.

9. The lithium conducting protective film of claim 5 , wherein the at least one tetralayer further comprises a plurality of tetralayers.

10. A lithium-air electrochemical cell comprising:
an anode comprising lithium;
an oxygen gas diffusive cathode;
a lithium conducting electrolyte interposed between the anode and the cathode; and
a lithium ion conducting protective film interposed between the anode and the electrolyte, the lithium ion conducting protective film comprising:
a lithium anode protective layer comprising a graphene oxide (GO) layer;
a lithium ion conductive layer; and
a cross-linking silane component to cross-link between the lithium anode protective layer and the lithium ion conductive layer of the film.

11. The electrochemical cell of claim 10 , wherein the oxygen gas diffusive cathode comprises porous carbon.

12. The electrochemical cell of claim 10 , wherein the lithium conducting electrolyte is an aqueous electrolyte.

13. The electrochemical cell of claim 10 , wherein the lithium conducting electrolyte is a non-aqueous electrolyte.

14. The electrochemical cell of claim 10 , wherein the lithium conducting electrolyte comprises dimethoxyethane-lithium bis(trifluoromethanesulfonyl)imide.

Assignees

• Samsung Electronics Co Ltd
• Samsung Electronics Co Ltd

Inventors

• Khiterer Mariya
• Hammond Paula T
• Lee Sun Hwa

Classifications

• H01M4/366

  as layered products · 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

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/02

  Electrodes composed of, or comprising, active material · CPC title

• H01M50/431

  Inorganic material · CPC title