US 11,855,275 B2
Method of preparing cathode for secondary battery
Kam Piu Ho, Hong Kong (CN); and Yingkai Jiang, Shenzhen (CN)
Assigned to GRST International Limited, Hong Kong (CN)
Appl. No. 17/794,273
Filed by GRST International Limited, Hong Kong (CN)
PCT Filed May 22, 2020, PCT No. PCT/CN2020/091936
§ 371(c)(1), (2) Date Jul. 21, 2022,
PCT Pub. No. WO2021/184534, PCT Pub. Date Sep. 23, 2021.
Claims priority of application No. PCT/CN2020/080525 (WO), filed on Mar. 20, 2020.
Prior Publication US 2023/0061306 A1, Mar. 2, 2023
Int. Cl. H01M 4/04 (2006.01); H01M 4/1391 (2010.01); H01M 4/131 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/1391 (2013.01) [H01M 4/0404 (2013.01); H01M 4/131 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/625 (2013.01); H01M 4/628 (2013.01); H01M 2004/028 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of preparing a cathode for a secondary battery, comprising the steps of:
1) dispersing a binder material and a conductive agent in water to form a first suspension;
2) adding an aqueous solution containing at least one lithium compound into the first suspension to form a second suspension;
3) adding a cathode active material into the second suspension to form a third suspension;
4) homogenizing the third suspension by a homogenizer to obtain a homogenized slurry;
5) applying the homogenized slurry on a current collector to form a coated film on the current collector; and
6) drying the coated film on the current collector to form the cathode,
wherein the lithium compound is selected from the group consisting of lithium borate, lithium bromide, lithium chloride, lithium hydrogen carbonate, lithium hydroxide, lithium iodide, lithium nitrate, lithium sulfate, lithium acetate, lithium lactate, lithium citrate, lithium succinate and combinations thereof.