US 12,255,310 B2
Apparatus for producing precursor having concentration gradient and material injection scheduling method therefor
Hwang Yol Ryu, Pohang-si (KR); and Ki Sung You, Pohang-si (KR)
Assigned to POSCO HOLDINGS INC., Pohang-si (KR); and RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY, Pohang-si (KR)
Appl. No. 16/957,458
Filed by POSCO, Pohang-si (KR); and RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY, Pohang-si (KR)
PCT Filed Dec. 12, 2018, PCT No. PCT/KR2018/015779
§ 371(c)(1), (2) Date Jun. 24, 2020,
PCT Pub. No. WO2019/132331, PCT Pub. Date Jul. 4, 2019.
Claims priority of application No. 10-2017-0180061 (KR), filed on Dec. 26, 2017.
Prior Publication US 2020/0373556 A1, Nov. 26, 2020
Int. Cl. H01M 4/134 (2010.01); H01M 4/1395 (2010.01); H01M 10/04 (2006.01); H01M 10/054 (2010.01); H01M 10/058 (2010.01)
CPC H01M 4/134 (2013.01) [H01M 4/1395 (2013.01); H01M 10/0404 (2013.01); H01M 10/054 (2013.01); H01M 10/058 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A material injection scheduling method for producing a precursor having a concentration gradient using an apparatus for producing a precursor having a concentration gradient mixing a material of a first feed tank (Q1) and a material of a second feed tank (Q2) with each other in advance in a mixer (Q3) to form a mixed material and injecting the mixed material into a reactor, the method comprising:
(a) transferring a predetermined amount of the material from Q1 to Q3 to be stored in Q3 in advance;
(b) calculating a feed flow rate Q3 by dividing a sum of a total amount of the material from Q1 and a total amount of a material from Q2 by a total process time (Tr);
(c) calculating a feed flow rate of the material from Q1 during a total process time (Tr), using Equation 2 below;
the flow rate(FQ1t) of the material from Q1 for a given time interval=2×(total amount of material from Q1−the predetermined amount of material from Q1 stored in Q3 in advance−amount of material from Q1 injected prior to the given time interval)/(time required for feeding entire material from Q1 feed tank(TQ1)−time already taken for injection into Q3)   Equation 2
(d) calculating an optimal value of FQ1t for making a difference in FQ1t to be a constant by iteratively inputting an estimated value of FQ1t;
(e) correcting the feed flow rate of the material from Q1 by redistributing a difference between the optimal value of FQ1t obtained in (d) and the flow rate (FQ1t) for each time interval as calculated in (c), and the values of the difference are arranged to time in reverse order to be subtracted from the optimal value of FQ1t obtained in (d); and
(f) calculating a feed flow rate of the material from Q2 by subtracting the feed flow rate of the material from Q1 corrected in (e) from the feed flow rate of the material from Q3,
(g) setting the feed flow rate of the material from Q1 to be the feed flow rate calculated in (e) for supplying the material from Q1 into Q3, and setting the feed flow rate of material from Q2 to be the feed flow rate calculated in (f) for supplying the material from Q2 into Q3 so as to form a mixed material, and
(h) supplying the mixed material into a reactor wherein a co-precipitation reaction takes place.