Recycling and reproducing method of lithium iron phosphate positive electrode material

The invention provides a recycling and reproducing method of a lithium iron phosphate positive electrode material for a secondary battery. The recycling and reproducing method comprises the following steps: (a) providing a lithium iron phosphate recycled material; (b) oxidizing the lithium iron phos...

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Bibliographic Details
Main Authors LEE EUI-JEOUNG, XIE HANWEI
Format Patent
LanguageChinese
English
Published 08.03.2024
Subjects
BASIC ELECTRIC ELEMENTS
CHEMISTRY
COMPOUNDS THEREOF
ELECTRICITY
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Summary:The invention provides a recycling and reproducing method of a lithium iron phosphate positive electrode material for a secondary battery. The recycling and reproducing method comprises the following steps: (a) providing a lithium iron phosphate recycled material; (b) oxidizing the lithium iron phosphate reclaimed material in the air atmosphere, treating the lithium iron phosphate reclaimed material at the oxidation temperature of 300-400 DEG C for 1-5 hours to form raw material powder, the raw material powder is composed of LiFePO4, Fe7 (PO4) 6, Fe2O3 and residual carbon, and the weight percentage of the residual carbon relative to the raw material powder ranges from 0.07 wt.% to 0.6 wt.%; (c) grinding the raw material powder; (d) the composition of the raw material powder is adjusted, a precursor is formed, the molar ratio of Li to P ranges from 0.99 to 1.05: 1, the molar ratio of Fe to P ranges from 0.98 to 1.02: 1, and a carbon source is added; and (e) treating the precursor in inert gas at a sintering te
Bibliography:Application Number: CN202310523592