METHOD FOR REUSING ACTIVE MATERIAL BY USING POSITIVE ELECTRODE SCRAP

Title:

METHOD FOR REUSING ACTIVE MATERIAL BY USING POSITIVE ELECTRODE SCRAP

Document Type and Number:

WIPO Patent Application WO/2022/065721

Kind Code:

A1

Abstract:

Provided is a method for recovering and reusing an active material from positive electrode scrap. The method for reusing a positive electrode active material of the present invention comprises the steps of: (a) dry-grinding positive electrode scrap, comprising a lithium composite transition metal oxide positive electrode active material layer on a current collector, to detach the active material layer in a powder form and separate same from the current collector; (b) adding a lithium precursor to the active material layer, which has been detached in a powder form, and then heat-treating same in air to overcoat or dope the surface of the active material layer with lithium from the lithium precursor, and thermally decomposing a conductive material and a binder inside the active material layer to recover an active material; and (c) washing the recovered active material by means of a lithium compound aqueous solution exhibiting basicity in an aqueous solution state, and drying same to obtain a reusable active material.

Inventors:

KIM MIN-SEO (KR)
PARK SE-HO (KR)
YANG DOO-KYUNG (KR)

Application Number:

PCT/KR2021/011630

Publication Date:

March 31, 2022

Filing Date:

August 30, 2021

Export Citation:

Click for automatic bibliography generation Help

Assignee:

LG ENERGY SOLUTION LTD (KR)

International Classes:

H01M10/54; C01G53/00; C22B7/00

Foreign References:

KR20000019850A	2000-04-15
KR20180100414A	2018-09-10
KR20180071106A	2018-06-27
KR101049937B1	2011-07-15
KR101191154B1	2012-10-15
KR20200125730A	2020-11-04

Other References: