US 12,355,079 B2
Lithium ion cells with silicon based active materials and negative electrodes with water-based binders having good adhesion and cohesion
Kevin Hays, Fremont, CA (US); Subramanian Venkatachalam, Pleasanton, CA (US); and Herman A. Lopez, Sunnyvale, CA (US)
Assigned to Ionblox, Inc., Fremont, CA (US)
Filed by Zenlabs Energy, Inc., Fremont, CA (US)
Filed on Jul. 2, 2020, as Appl. No. 16/920,047.
Prior Publication US 2022/0006090 A1, Jan. 6, 2022
Int. Cl. H01M 4/62 (2006.01); H01M 4/02 (2006.01); H01M 4/1315 (2010.01); H01M 4/48 (2010.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/622 (2013.01) [H01M 4/1315 (2013.01); H01M 4/48 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A negative electrode for a lithium ion battery comprising:
an active material comprising a silicon oxide-based active material;
nanoscale conductive carbon; and
a polymer binder consisting essentially of poly (acrylamide-co-acrylate salt) having at least about 5 mole percent of the acrylate salt moiety and at least about 5 mole percent of the acrylamide moiety
wherein the negative electrode on a metal foil current collector has a 180 degree peel adhesion with a force of at least about 6 pound-force/meter and a cohesion corresponding to maintenance of electrode integrity when bent around a mandrel with a diameter of 6 mm.