Selective extraction of lithium from a spent lithium iron phosphate battery by mechanochemical solid-phase oxidation
- 5 January 2021
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Green Chemistry
- Vol. 23 (3), 1344-1352
- https://doi.org/10.1039/d0gc03683h
Abstract
This study proposes a green process for selective and rapid extraction of lithium from the cathode materials of spent lithium iron phosphate (LiFePO4) batteries via mechanochemical solid-phase oxidation. The advantages of the designed process are: (1) acid/base free; (2) extremely short time (5.0 min); (3) wastewater-free discharge; (4) three new chemical products; (5) high economic profit. The results show that by using solid-phase oxidant sodium persulfate (Na2S2O8) as a mechanochemical co-grinding agent and by carrying out the mechanochemical reaction under optimal conditions (rotary speed of 600 rpm, reaction time of 5.0 min, and Na2S2O8 : LiFePO4 mass ratio of 2 : 1), 99.7 wt% of the lithium in LiFePO4 can be selectively released and converted to lithium sulphate (Li2SO4), while the iron phosphate maintains an olivine frame structure. Lithium can then be recovered as a lithium phosphate (Li3PO4) product by integrated water leaching and chemical precipitation. Mechanism analysis shows that mechanochemical-assisted solid-phase oxidation may be a new approach for the selective release of lithium from LiFePO4; lithium behaves differently in this process compared to liquid-phase oxidation. This study provides a new approach to the selective and green recovery of lithium in spent LiFePO4 batteries.Keywords
Funding Information
- National Key Research and Development Program of China (2017YFF0211604, 2018YFC1900101)
- National Natural Science Foundation of China (71804085, 51908318)
- China Postdoctoral Science Foundation (2019T120104)
This publication has 40 references indexed in Scilit:
- Recovery of rare and precious metals from urban mines—A reviewFrontiers of Environmental Science & Engineering, 2017
- Lithium Carbonate Recovery from Cathode Scrap of Spent Lithium-Ion Battery: A Closed-Loop ProcessEnvironmental Science & Technology, 2017
- Recent development of recycling lead from scrap CRTs: A technological reviewWaste Management, 2016
- Green Recovery of Rare Earths from Waste Cathode Ray Tube Phosphors: Oxidative Leaching and Kinetic AspectsACS Sustainable Chemistry & Engineering, 2016
- Toward Sustainability for Recovery of Critical Metals from Electronic Waste: The Hydrochemistry ProcessesACS Sustainable Chemistry & Engineering, 2016
- Environmentally friendly recycling and effective repairing of cathode powders from spent LiFePO4 batteriesGreen Chemistry, 2015
- Solving spent lithium-ion battery problems in China: Opportunities and challengesRenewable and Sustainable Energy Reviews, 2015
- Recycling Metals from Wastes: A Novel Application of MechanochemistryEnvironmental Science & Technology, 2015
- A brief review on hydrometallurgical technologies for recycling spent lithium‐ion batteriesJournal of Chemical Technology & Biotechnology, 2013
- The electronic structure and band gap of LiFePO4 and LiMnPO4Solid State Communications, 2004