METHOD FOR PREPARING LITHIUM IRON PHOSPHATE POSITIVE ELECTRODE MATERIAL IN DIRECTIONAL RECYCLING MANNER FROM WASTE LITHIUM IRON PHOSPHATE BATTERY - GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD

Title:

METHOD FOR PREPARING LITHIUM IRON PHOSPHATE POSITIVE ELECTRODE MATERIAL IN DIRECTIONAL RECYCLING MANNER FROM WASTE LITHIUM IRON PHOSPHATE BATTERY

Document Type and Number:

WIPO Patent Application WO/2024/082544

Kind Code:

A1

Abstract:

Disclosed in the present invention is a method for preparing a lithium iron phosphate positive electrode material in a directional recycling manner from a waste lithium iron phosphate battery, comprising the following steps: (1) performing alkali leaching on waste lithium iron phosphate battery black powder by using an alkali liquid, performing solid-liquid separation to obtain solid residues, mixing the solid residues with acid and an oxidizing agent and soaking the mixture, then adding a reducing agent, and performing solid-liquid separation to obtain a filtrate; (2) adding phosphoric acid into the filtrate obtained in step (1), then pyrolyzing to obtain a dried material, and mixing the dried material with a lithium source, a ferrous source and a carbon source to obtain a mixture; and (3) adding the mixture obtained in step (2) into aqueous ammonia for a hydrothermal reaction, then performing ammonia-stilling to obtain solid particles, and roasting the solid particles in an inert gas to obtain a lithium iron phosphate positive electrode material. The positive electrode material prepared by the method has relatively high specific capacity, thereby achieving full utilization of resources.

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Inventors:

YU HAIJUN (CN)
WANG TAO (CN)
XIE YINGHAO (CN)
LI AIXIA (CN)
ZHANG XUEMEI (CN)
LI CHANGDONG (CN)

Application Number:

PCT/CN2023/083145

Publication Date:

April 25, 2024

Filing Date:

March 22, 2023

Export Citation:

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Assignee:

GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)

International Classes:

C01B25/45; H01M4/58; H01M10/0525; H01M10/54

Foreign References:

CN115744857A	2023-03-07
CN110581323A	2019-12-17
CN112768800A	2021-05-07
CN111547697A	2020-08-18
CN113737018A	2021-12-03
US20180261894A1	2018-09-13

Attorney, Agent or Firm:

JIAQUAN IP LAW (CN)

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