US 12,234,158 B2
Methods for preparing particle precursor and cathode active particles, and particle precursor prepared thereby
Bryan Yonemoto, Clearwater, FL (US); Xiao Zhang, Huzhou (CN); Huijie Guo, Huzhou (CN); and Jianzhao Liu, Huzhou (CN)
Assigned to MICROVAST ADVANCED MATERIALS INC., Lake Mary, FL (US)
Appl. No. 17/043,610
Filed by Microvast Power Systems Co., LTD., Huzhou (CN)
PCT Filed May 21, 2019, PCT No. PCT/CN2019/087871
§ 371(c)(1), (2) Date Sep. 29, 2020,
PCT Pub. No. WO2019/223705, PCT Pub. Date Nov. 28, 2019.
Claims priority of provisional application 62/674,592, filed on May 21, 2018.
Prior Publication US 2021/0017040 A1, Jan. 21, 2021
Int. Cl. C01G 53/00 (2006.01); H01M 4/04 (2006.01); H01M 4/1391 (2010.01); H01M 4/36 (2006.01); H01M 4/525 (2010.01); H01M 4/02 (2006.01)
CPC C01G 53/006 (2013.01) [H01M 4/0471 (2013.01); H01M 4/1391 (2013.01); H01M 4/366 (2013.01); H01M 4/525 (2013.01); C01P 2004/03 (2013.01); C01P 2004/84 (2013.01); H01M 2004/028 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for preparing a particle precursor, comprising the following steps:
feeding stream (b) into a reactor for providing precipitating anions, feeding stream (a) for providing transitional-metal cations, whereby the precipitating anions and the transitional-metal cations reacting to form a precipitated particle slurry; wherein the stream (b) is fed by the following steps: feeding the stream (b) with only a first anion composition B1; and stopping the first anion composition B1 and feeding the stream (b) with only a second anion composition B2 which is different from the first anion composition B1 at a first switching time between the time when precipitation starts and the time when the reaction ends, wherein the stream (a) comprises at least one cation composition; and
filtering, and drying the precipitated particle slurry to yield the particle precursor comprising a core-shell structure;
wherein the first anion composition B1 is in a core layer and the second anion composition B2 is in a shell layer to form the core-shell structure, and the second anion composition B2 in the shell layer initiates a concentration gradient when the first anion composition B1 stops feeding and the second anion composition B2 starts feeding.