Publications by authors named "Fengyin Zhou"
Coupling Electrochemical Leaching with Solvent Extraction for Recycling Spent Lithium-Ion Batteries.
Environ Sci Technol
September 2024
Article Synopsis
- The proposed method combines electrochemical leaching and solvent extraction to effectively recover lithium (Li) and cobalt (Co) from used lithium-ion batteries.
- Electrochemical leaching converts solid LiCoO to soluble Li and Co, achieving up to a 7-fold increase in extraction yields compared to traditional acid leaching methods.
- This process not only improves the efficiency of metal recovery while minimizing chemical use and environmental impact, but also shows strong kinetic performance, suggesting cost benefits and reduced pollution.
Article Synopsis
- Biomass-assisted pyrolysis is a promising method for recycling spent lithium-ion batteries, particularly LiMnO and LiNiCoMnO.
- The process employs sawdust pyrolysis and advanced analysis techniques to demonstrate high recovery efficiencies—over 99% for both battery types.
- Economic and environmental benefits are highlighted, including low energy consumption, environmental compatibility, and strong economic viability.
Article Synopsis
- Waste biomass can produce syngas, which is useful for fuels and chemicals, but the link between biomass components and pyrolysis gas remains unclear.
- This study examines how different biomasses behave during pyrolysis and their impact on gas composition, finding that cellulose-rich biomass produces more CO.
- The research reveals that gases with high CO content effectively convert spent lithium cobalt oxide (LiCoO) to valuable products, suggesting a method for improving battery recycling and syngas production.
The development of spent lithium-ion batteries (LIBs) recycling technologies can effectively alleviate environmental pressure and conserve metal resources. We propose a win-win strategy for pyrolysis gas reduction by lignocellulosic biomass, ensuring gas-induced reduction by spatial isolation of biomass and lithium transition metal oxides (LiTMO (TM = Ni, Co, Mn)), and avoiding the separation of solid carbon and TMO (TM = Ni, Co, Mn). In the spent LiCoO batteries, the lithium recovery efficiency reaches 99.
View Article and Find Full Text PDFElectrochemically activating peroxydisulfate (PDS) to degrade organic pollutants is one of the most attractive advanced oxidation processes (AOPs) to address environmental issues, but the high cost, poor stability, and low degradation efficiency of the anode materials hinder their application. Herein, an economic, self-supporting, robust, and durable LiFeO on Fe substrate (Fe@LFO) anode is reported to degrade sulfamethoxazole (SMX). When PDS is electrochemically activated by the Fe@LFO anode, the degradation rate of SMX is significantly improved.
View Article and Find Full Text PDFDecreasing the operating temperature of pyrometallurgical methods for recycling spent lithium-ion batteries (LIBs) is key to reducing energy consumption and cost. Herein, a NaOH-assisted low-temperature roasting approach is proposed to recover spent LiFePO. During roasting, NaOH acts as an oxidizing agent to oxidize Fe (II) to FeO at 150°C, thus collapsing its stable olivine structure while PO capturing Li and Na to form LiNaPO and LiNa(PO).
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