US 11,699,806 B2
Thin nanocoating separators for batteries
Reza Shahbazian-Yassar, Chicago, IL (US); and Tara Foroozan, Chicago, IL (US)
Assigned to THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS, Urbana, IL (US)
Filed by THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS, Urbana, IL (US)
Filed on Feb. 7, 2020, as Appl. No. 16/784,491.
Claims priority of provisional application 62/802,640, filed on Feb. 7, 2019.
Prior Publication US 2020/0259150 A1, Aug. 13, 2020
Int. Cl. H01M 50/449 (2021.01); H01M 10/052 (2010.01); H01M 4/38 (2006.01); H01M 50/44 (2021.01); H01M 50/403 (2021.01); H01M 50/431 (2021.01); H01M 4/02 (2006.01)
CPC H01M 50/449 (2021.01) [H01M 4/382 (2013.01); H01M 10/052 (2013.01); H01M 50/403 (2021.01); H01M 50/431 (2021.01); H01M 50/44 (2021.01); H01M 2004/027 (2013.01)] 24 Claims
 
1. A battery, comprising:
a separator that is porous; and
a graphene oxide (GO) nanosheet coating coupled to a surface of the separator, wherein the GO nanosheet coating is configured as a buffer layer to permit transport of Li-ions therethrough and to regulate a rate of flow of the transport of the Li-ions, and
wherein the GO nanosheet coating is lithiophilic.
 
18. A battery, comprising:
a separator that is porous; and
a graphene oxide (GO) nanosheet coating coupled to a surface of the separator, wherein the GO nanosheet coating is configured as a buffer layer to permit transport of Li-ions therethrough and to regulate a rate of flow of the transport of the Li-ions, and
wherein a plurality of gaps exist between a plurality of GO nanosheets in the GO nanosheet coating and the plurality of GO nanosheets have a plurality of defective sites and have negatively charged functional groups on a surface of the plurality of GO nanosheets that each permit and regulate the transport of Li-ions therethrough.
 
22. A battery, comprising:
a separator that is porous; and
a graphene oxide (GO) nanosheet coating coupled to a surface of the separator, wherein the GO nanosheet coating is configured as a buffer layer to permit transport of Li-ions therethrough and to regulate a rate of flow of the transport of the Li-ions, and
wherein the surface of the separator that is coupled to the GO nanosheet coating is uneven or bumpy and wherein the GO nanosheet coating is three-dimensional and integrated into the porous separator.