US 11,656,283 B2
Method for determining dispersibility of electrode material layer
Ji Hye Park, Daejeon (KR); and Seok Koo Kim, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/47,873
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jul. 11, 2019, PCT No. PCT/KR2019/008599
§ 371(c)(1), (2) Date Oct. 15, 2020,
PCT Pub. No. WO2020/091188, PCT Pub. Date May 7, 2020.
Claims priority of application No. 10-2018-0131267 (KR), filed on Oct. 30, 2018.
Prior Publication US 2021/0156922 A1, May 27, 2021
Int. Cl. G01R 31/367 (2019.01); H01M 10/0525 (2010.01); G01R 31/396 (2019.01); H01M 4/13 (2010.01); G01R 31/392 (2019.01); H01M 4/02 (2006.01); G01N 27/04 (2006.01)
CPC G01R 31/367 (2019.01) [G01N 27/041 (2013.01); H01M 10/0525 (2013.01); G01N 27/04 (2013.01); G01R 31/392 (2019.01); G01R 31/396 (2019.01); H01M 4/02 (2013.01); H01M 4/13 (2013.01); Y02E 60/10 (2013.01)] 10 Claims
OG exemplary drawing
1. A method for determining dispersibility of an electrode material layer of an electrode for a lithium rechargeable battery, comprising:
preparing a mixture comprising the an active material, a conductive material, and a binder,
disposing the mixture on at least one side of an electrode current collector,
drying and rolling the electrode current collector on which the mixture is disposed to prepare the electrode material layer,
(a) selecting two random points (1-1′) of the electrode material layer,
(b) finding a difference Δ1 of an absolute value of two voltage values by measuring voltages between the two points (1-1′) in different current directions,
(c) selecting two other random points (2-2′ to n-n′, where n is an integer that is equal to or greater than 2) that are different from the two points selected in the process (a) and, and repeating the processes (a) and (b) at least once to find Δ2 to Δn,
(d) finding a mean value of differences Δ1 to Δn of the absolute values obtained by repeating the process (b) and the process (c), and
(e) finding a standard deviation of Δ1 to Δn from the mean value,
wherein, dispersibility of the electrode material layer is determined to be higher as the standard deviation value of the process (e) becomes smaller, and
the electrode material layer including an active material, a conductive material, and a binder is formed on at least one side of an electrode current collector.