US 11,679,992 B2
Methods for preparing particle precursor, and particle precursor prepared thereby
Bryan Yonemoto, Clearwater, FL (US); and Xiao Zhang, Huzhou (CN)
Assigned to MICROVAST POWER SYSTEMS CO., LTD., Huzhou (CN)
Appl. No. 17/43,623
Filed by Microvast Power Systems Co., LTD., Huzhou (CN)
PCT Filed Jun. 11, 2019, PCT No. PCT/CN2019/090669
§ 371(c)(1), (2) Date Sep. 29, 2020,
PCT Pub. No. WO2019/238033, PCT Pub. Date Dec. 19, 2019.
Claims priority of provisional application 62/683,042, filed on Jun. 11, 2018.
Claims priority of provisional application 62/683,040, filed on Jun. 11, 2018.
Prior Publication US 2021/0032122 A1, Feb. 4, 2021
Int. Cl. C01G 53/00 (2006.01); B01J 4/00 (2006.01); C01G 53/06 (2006.01); H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01); H01M 4/525 (2010.01); B01J 19/00 (2006.01); H01M 4/139 (2010.01); H01M 4/13 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC C01G 53/006 (2013.01) [B01J 4/008 (2013.01); B01J 19/0086 (2013.01); C01G 53/06 (2013.01); H01M 4/0497 (2013.01); H01M 4/13 (2013.01); H01M 4/131 (2013.01); H01M 4/139 (2013.01); H01M 4/1391 (2013.01); H01M 4/525 (2013.01); B01J 2204/002 (2013.01); B01J 2219/00177 (2013.01); B01J 2219/00186 (2013.01); C01P 2002/52 (2013.01); C01P 2004/03 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for preparing a core-shell structured particle precursor, comprising the following steps:
from an initial time t0 to a first time t1, feeding a first anion composition B1 through a first container into a reactor, and feeding a first cation composition A1 through a second container into the reactor, the first anion composition B1 and the first cation composition A1 reacting and precipitating in the reactor, t1 comes after to, t0=0;
at the first time t1, the first container is full of the first anion composition B1, and the second container is full of the first cation composition A1;
feeding a second anion composition B2 through a third container into the first container and feeding the second anion composition B2 and the first anion composition B1 through the first container into the reactor from the first time t1 to a second time t2, t2 comes after t1, during which the first anion composition B1 is gradually switched to the second anion composition B2 wherein the first anion composition B1 is hydroxide salts, and the second anion composition B2 is at leaset one selected from the group consisting of carbonate, oxalate, or a comination thereof; and feeding at least the first cation composition A1 through the second container into the reactor from the first time t1 to the second time t2, thereby forming a precipitated particle slurry; and
filtering, and drying the precipitated particle slurry to yield the particle precursor;
wherein instantaneous concentration of anions being fed into the reactor from the first time t1 to the second time t2 can be described as:

OG Complex Work Unit Math
wherein:
B is the instantaneous concentration of anions being fed into the reactor;
Bi is the anion concentration at time ti that exists in the first container;
Vi is the volume of solution at time ti that exists in the first container;
FB2 is the flowrate from the third container into the first container;
B2 is the anion concentration in the third container;
FB is the flowrate from the first container into the reactor;
ti+1 is time at moment i+1;
ti is time at moment i;
Vi+1 is the volume of solution at time ti+1 that exists in the first container.