US 11,996,553 B2
Method of coating electroactive materials with conductive polymers
Gongshin Qi, Troy, MI (US); and Jiazhi Hu, Troy, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Oct. 21, 2021, as Appl. No. 17/507,479.
Prior Publication US 2023/0129069 A1, Apr. 27, 2023
Int. Cl. H01M 4/36 (2006.01); H01M 4/04 (2006.01); H01M 4/38 (2006.01); H01M 4/525 (2010.01); H01M 4/583 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/0471 (2013.01); H01M 4/386 (2013.01); H01M 4/525 (2013.01); H01M 4/583 (2013.01); H01M 4/624 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2250/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of preparing a coated electroactive material, the method comprising:
coating a plurality of particles comprising an electroactive material with a conductive polymer by:
preparing a solution that comprises water, the conductive polymer, and an additive selected from the group consisting of: 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, bis(trifluoromethane)sulfonimide lithium salt, 4-(3-butyl-1-imidazolio)-1-butanesulfonic acid triflate, diethylene glycol, and combinations thereof,
forming a slurry by combining the solution with the plurality of particles, and
drying the slurry to form the coated electroactive material, the coated electroactive material comprising the plurality of particles, each of the plurality of particles being at least partially coated with the conductive polymer, wherein
the electroactive material is a positive electroactive material selected form the group consisting of: NMC, LLC, LFP, LMFP, NCMA, LMO, and combinations thereof,
a weight ratio of the conductive polymer to the electroactive material is greater than or equal to about 0.01 to less than or equal to about 0.1, and
the additive is present in the solution in an amount less than about 10 weight percent.