US 12,379,320 B2
Method for analyzing content and distribution of boron introduced into positive electrode active material
Jung Hye Won, Daejeon (KR); Sung Hag Kim, Daejeon (KR); Min Hwan Jung, Daejeon (KR); Jung Eun Song, Daejeon (KR); and Kyeongrak Kim, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 18/011,252
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Sep. 1, 2021, PCT No. PCT/KR2021/011794
§ 371(c)(1), (2) Date Dec. 19, 2022,
PCT Pub. No. WO2022/139118, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 10-2020-0181058 (KR), filed on Dec. 22, 2020; and application No. 10-2021-0107445 (KR), filed on Aug. 13, 2021.
Prior Publication US 2023/0324304 A1, Oct. 12, 2023
Int. Cl. G01N 1/38 (2006.01); G01N 1/44 (2006.01); G01N 21/73 (2006.01); G01N 33/2022 (2019.01)
CPC G01N 21/73 (2013.01) [G01N 1/38 (2013.01); G01N 1/44 (2013.01); G01N 33/2022 (2019.01)] 9 Claims
OG exemplary drawing
 
1. An analysis method of content of boron introduced into a cathode active material, the method comprising:
(S1) introducing boron into a cathode active material to prepare a cathode active material sample;
(S2) dissolving the cathode active material sample in water to obtain a first liquid layer and a first precipitate, treating the first liquid layer with acid to form a first resulting solution, and then determining a concentration of boron in the first resulting solution by inductively coupled plasma optical emission spectroscopy (ICP-OES);
(S3) dissolving the first precipitate in water to obtain a second liquid layer and a second precipitate, treating the second liquid layer with acid to form a second resulting solution, and then determining a concentration of boron in the second resulting solution by ICP-OES; and
(S4) adding acid and hydrogen peroxide to the second precipitate to form a third resulting solution, and then determining a concentration of boron in the third resulting solution by ICP-OES.