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| Preparation of Battery Grade Lithium Carbonate by Selective Extraction of Lithium from Waste Lithium Iron Phosphate Cathode |
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Received:February 11, 2022
Revised:February 20, 2022
Accepted:February 23, 2022
Published Online:August 11, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.09.008 |
| KeyWord:waste lithium iron phosphate; battery grade lithium carbonate; hydrogen peroxide oxidation; recovery |
| Author | Institution |
| WANG Duo-duo |
北京科技大学冶金与生态工程学院 |
| JING Qian-kun |
北京科技大学冶金与生态工程学院 |
| ZHANG Jia-liang |
北京科技大学冶金与生态工程学院 |
| CHEN Yong-qiang |
北京科技大学冶金与生态工程学院 |
| WANG Cheng-yan |
北京科技大学冶金与生态工程学院 |
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| Abstract: |
| The recycling of waste lithium iron phosphate (LFP) batteries is of great significance to reduce environmental pollution and relieve pressure of lithium resources. The traditional method for recycling of waste LFP battery has the problems of low lithium recovery and high cost of waste water treatment. The system of "H2O2+H2SO4" was proposed to selectively recover lithium which was inspired by E-pH diagram of Li-Fe-P-H2O system and the charging and discharging process of LFP battery. XRD and SEM studies show that the structure of olivine FePO4 is consistent with structure of original LiFePO4 phase and change of micro morphology is also very small. Under the optimized conditions, leaching rate of Li is 98% above, while the leaching rate of Fe and P is 0.1% below. Battery grade lithium carbonate is prepared from the lithium leaching solution after purification. |
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