METHOD FOR SELECTIVE OXIDATION-REDUCTION REGENERATION FROM WASTE LITHIUM IRON PHOSPHATE, REGENERATED LITHIUM IRON PHOSPHATE, AND LITHIUM ION BATTERY

Title:

METHOD FOR SELECTIVE OXIDATION-REDUCTION REGENERATION FROM WASTE LITHIUM IRON PHOSPHATE, REGENERATED LITHIUM IRON PHOSPHATE, AND LITHIUM ION BATTERY

Document Type and Number:

WIPO Patent Application WO/2021/114747

Kind Code:

A1

Abstract:

Disclosed are a method for selective oxidation-reduction regeneration from waste lithium iron phosphate, regenerated lithium iron phosphate, and a lithium ion battery. The method comprises: performing primary sintering on waste lithium iron phosphate under the condition of introducing a mild oxidizing gas; separating lithium iron phosphate powder; using a lithium source and a carbon source to perform lithium and carbon supplementing and composition adjustment on the lithium iron phosphate powder by means of secondary sintering to obtain regenerated lithium iron phosphate, wherein the mild oxidizing gas is water vapor, CO 2 gas, or a mixed gas of both. By means of the method of the present application, lithium iron phosphate with excellent performance can be prepared. The material has the electrochemical characteristics of excellent cycle performance under normal temperature and high temperature as well as high compaction density, and also has the advantage of low cost.

Inventors:

YUE HAIFENG (CN)
HE XUEQIN (CN)
HUANG YOUYUAN (CN)
YANG CAIDE (CN)
YANG SHUNYI (CN)
XI XIAOBING (CN)

Application Number:

PCT/CN2020/112973

Publication Date:

June 17, 2021

Filing Date:

September 02, 2020

Export Citation:

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Assignee:

BTR TIANJIN NANO MAT MANUFACTURE CO LTD (CN)

International Classes:

H01M10/54

Foreign References:

CN109167119A	2019-01-08
CN109346789A	2019-02-15
CN102208706A	2011-10-05
CN102751548A	2012-10-24
CN109652654A	2019-04-19
CN110085937A	2019-08-02
JP2005197149A	2005-07-21
CN201911251921A	2019-12-09

Other References: