Recycling spent lead acid batteries into aqueous zinc-ion battery material with ultra-flat voltage platforms |
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Affiliation: | 1. College of Physics and Energy, Fujian Normal University, Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, Fuzhou, 350117, China;2. Fujian Provincial Engineering Technical Research Centre of Solar-Energy Conversion and Stored Energy, Fuzhou, 350117, China;3. Fujian Provincial Collaborative Innovation Centre for Advanced High-Field Superconducting Materials and Engineering, Fuzhou, 350117, China;4. Physics Department, Lancaster University, Lancaster, LA1 4YB, UK;5. The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot, OX11 0RA, UK |
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Abstract: | The harmless disposal of lead paste in the spent lead-acid batteries (LABs) remains an enormous challenge in traditional pyrometallurgical recycling. Here, we introduced a hydrometallurgical method for the recycling of the spent LABs’ waste to obtain the β-PbO as a novel zinc ion batteries (ZIBs) active material. The obtained β-PbO exhibits ultra-flat charge/discharge voltage platforms (0.21 mV/(mAh g?1)) and stable specific capacity. During the charge/discharge, the β-PbO spontaneously triggers the formation of (ZnSO4)Zn(OH)2]3·5H2O (ZHS) micro-sheets as a surface passivation layer. Moreover, the ex-situ X-ray spectra reveal that the reversible phase transformation occurs between PbSO4 and Pb with the assistance of ZHS by adjusting the PH value on the electrode-electrolyte interface. The synergistic two-phase-reaction mechanism generates ultra-flat voltage platforms upon the charge/discharge. This “energy-saving and environment-friendly” recycling route eliminates the major source of emission of pollution particulates/gases compared to the traditional pyrometallurgical recycling, while at the same time replacing energy-consuming and environmentally detrimental processes of synthesis of current ZIBs cathodes. |
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Keywords: | Aqueous zinc ion battery Hydrometallurgical battery recycling Lead oxide Ultra-flat voltage platform |
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