METHOD FOR CHECKING DISPERSION OF ELECTRODE MATERIAL LAYER

Title:

METHOD FOR CHECKING DISPERSION OF ELECTRODE MATERIAL LAYER

Document Type and Number:

WIPO Patent Application WO/2020/091188

Kind Code:

A1

Abstract:

The present invention relates to a method for checking the dispersion of an electrode material layer of an electrode for a lithium rechargeable battery, the electrode having the electrode material layer, comprising an active material, a conductive material and a binder, formed on at least one surface of an electrode current collector, and the method for checking the dispersion of the electrode material layer comprising the steps of: (a) selecting two arbitrary points (1-1') of the electrode material layer; (b) measuring a voltage between the two points (1-1') for each of mutually different current directions, and calculating the difference (△1) between the absolute values of the two voltage values; (c) selecting two arbitrary points (2-2' to n-n'; n is an integer equal to or greater than 2) which are different from the two points selected in step (a), and calculating △2 to △n by repeating steps (a) and (b) one or more times; (d) calculating the average of the differences between the absolute values, △1 to △n, obtained by repeating steps (b) and (c); and (e) calculating the standard deviation of △1 to △n from the average, wherein the dispersion of the electrode material layer is determined to increase as the standard deviation value of step (e) decreases.

Inventors:

PARK JI HYE (KR)
KIM SEOK KOO (KR)

Application Number:

PCT/KR2019/008599

Publication Date:

May 07, 2020

Filing Date:

July 11, 2019

Export Citation:

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Assignee:

LG CHEMICAL LTD (KR)

International Classes:

G01N27/04; H01M4/13

Foreign References:

JP2014081362A	2014-05-08
JP2014025850A	2014-02-06
JP2015018764A	2015-01-29
CN108519407A	2018-09-11
KR20130064288A	2013-06-18

Other References: