Electrochemical Properties and the Adsorption of Lithium Ions in the Brine of Lithium-Ion Sieves Prepared from Spent Lithium Iron Phosphate Batteries

Hsing-I Hsiang () and Wei-Yu Chen
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Hsing-I Hsiang: Department of Resources Engineering, National Cheng Kung University, Tainan 70101, Taiwan
Wei-Yu Chen: Department of Resources Engineering, National Cheng Kung University, Tainan 70101, Taiwan

Sustainability, 2022, vol. 14, issue 23, 1-12

Abstract: Because used LiFePO 4 batteries contain no precious metals, converting the lithium iron phosphate cathode into recycled materials (Li 2 CO 3 , Fe, P) provides no economic benefits. Thus, few researchers are willing to recycle them. As a result, environmental sustainability can be achieved if the cathode material of spent lithium-iron phosphate batteries can be directly reused via electrochemical technology. Lithium iron phosphate films were developed in this study through electrophoretic deposition using spent lithium-iron phosphate cathodes as raw materials to serve as lithium-ion sieves. The lithium iron phosphate films were then coated with a layer of polypyrrole (PPy) conductive polymer to improve the electrochemical properties and the lithium-ion adsorption capacity for brine. Cyclic voltammetry, charge/discharge testing, and an AC impedance test were used to determine the electrochemical properties and lithium-ion adsorption capacity of lithium-ion sieves. The findings indicate that lithium iron phosphate films prepared from spent LiFePO 4 cathodes have a high potential as a lithium-ion sieve for electro-sorption from brine.

Keywords: spent lithium-ion battery; lithium iron phosphate; lithium-ion sieve; electro-sorption; polypyrrole (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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