US 11,990,659 B2
Fe-Cr redox flow battery systems and methods for preparation of chromium-containing electrolyte therefor
Liyu Li, Bellevue, WA (US); and Qingtao Luo, Mukilteo, WA (US)
Assigned to COUGAR CREEK TECHNOLOGIES, LLC, Kirkland, WA (US)
Filed by COUGAR CREEK TECHNOLOGIES, LLC, Kirkland, WA (US)
Filed on Jun. 29, 2021, as Appl. No. 17/362,499.
Claims priority of provisional application 63/174,352, filed on Apr. 13, 2021.
Claims priority of provisional application 63/154,547, filed on Feb. 26, 2021.
Claims priority of provisional application 63/147,182, filed on Feb. 8, 2021.
Claims priority of provisional application 63/131,738, filed on Dec. 29, 2020.
Claims priority of provisional application 63/127,048, filed on Dec. 17, 2020.
Claims priority of provisional application 63/126,408, filed on Dec. 16, 2020.
Claims priority of provisional application 63/120,204, filed on Dec. 2, 2020.
Claims priority of provisional application 63/114,160, filed on Nov. 16, 2020.
Prior Publication US 2022/0158211 A1, May 19, 2022
Int. Cl. H01M 8/08 (2016.01); C22C 1/00 (2023.01); C22C 27/06 (2006.01); H01M 4/38 (2006.01); H01M 8/04186 (2016.01); H01M 8/04276 (2016.01); H01M 8/04537 (2016.01); H01M 8/04858 (2016.01); H01M 8/18 (2006.01); H01M 16/00 (2006.01); H01M 4/86 (2006.01); H01M 8/06 (2016.01)
CPC H01M 8/188 (2013.01) [C22C 1/00 (2013.01); C22C 27/06 (2013.01); H01M 4/38 (2013.01); H01M 8/04186 (2013.01); H01M 8/04276 (2013.01); H01M 8/04544 (2013.01); H01M 8/04611 (2013.01); H01M 8/04932 (2013.01); H01M 8/08 (2013.01); H01M 16/003 (2013.01); H01M 2004/8694 (2013.01); H01M 8/0693 (2013.01); H01M 2300/0002 (2013.01); H01M 2300/0005 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for preparation of electrolyte for a redox flow battery, the method comprising:
reducing chromium ore using a carbon source to convert the chromium ore to an iron/chromium alloy with carbon particles;
dissolving the iron/chromium alloy with carbon particles in sulfuric acid to form a first solution;
adding calcium chloride or barium chloride to the first solution to produce a second solution comprising FeCl3 and CrCl3; and
adding an acid to the second solution to form the electrolyte.