期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 319, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2022.115740
关键词
Waste LiFePO4 batteries; Cathode materials; Selective leaching; Closed-loop
资金
- National Natural Science Foundation of China [52004116]
- Major Science and Technology Special Program of Yunnan Province [202202AG050003]
- National Key Research and Development Program of China [2019YFC1907900]
- Applied Basic Research Plan of Yunnan Province [202101AS070020, 202201AT070184, 202101BE070001-016, 202001 AU070039]
- High-level Talent Introduction Scientific Research Start Project of KUST [20190015]
- analysis and testing fund of Kunming University of Technology [2021M20202202144]
- Innovation cooperation project of Kunming Guiyan New Material Technology Co., Ltd. [2021530101000346]
A sustainable closed-loop method for recovering waste lithium iron phosphate batteries is developed. Li+ is selectively leached from cathode materials and used to synthesize LiFePO4 materials. The regenerated LiFePO4 materials show good electrochemical properties.
A sustainable closed-loop method for recovering waste lithium iron phosphate batteries is developed in this paper. Li+ was selectively leached from cathode materials in a system of NaHSO4 and H2O2. Under the optimal conditions of leaching temperature of 65 degrees C, 1.1 times molar quantity NaHSO4, 2 vol% H2O2, solid-liquid ratio of 100 g/L and leaching time of 15 min, the leaching efficiency of Li can reach 99.84%, while Fe is only 0.048%. Meanwhile, XRD, FTIR, XPS and TEM analysis were carried out to explore the conversion mechanism in the oxidation leaching process of the original raw and leaching products. Li+ in the filtrate was precipitated with Na2CO3 and converted into Li2CO3. The precipitated salty wastewater can be converted into leaching agent for recycling by adding a certain amount of sulfuric acid. The recycled products are used to synthesize LiFePO4 materials, and regenerated LiFePO4 materials show good electrochemical properties. The discharge capacity displays 141.3 mAhg(-1) at 1C, with the capacity retention rate of 99.4% after 200 cycles. This study provides a sustainable closed-loop process for recycling and reuse of waste LiFePO4 batteries, which promotes resource conservation and environmental protection.
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