Please use this identifier to cite or link to this item: doi:10.22028/D291-34206
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Title: Electrochemical lithium recovery with lithium iron phosphate: what causes performance degradation and how can we improve the stability?
Author(s): Wang, Lei
Frisella, Kathleen
Srimuk, Pattarachai
Janka, Oliver
Kickelbick, Guido
Presser, Volker
Language: English
Title: Sustainable energy & fuels : interdisciplinary research for the development of sustainable energy technologies
Volume: 5
Issue: 12
Startpage: 3124
Endpage: 3133
Publisher/Platform: RSC
Year of Publication: 2021
Publikation type: Journal Article
Abstract: Electrochemical processes enable fast lithium extraction, for example, from brines, with high energy efficiency and stability. Lithium iron phosphate (LiFePO4) and manganese oxide (λ-MnO2) have usually been employed as the lithium gathering electrode material. Compared with λ-MnO2, LiFePO4 has a higher theoretical capacity and lower lithium insertion potential but suffers from low performance stability. Therefore, exploring the reason for capacity fading and putting forward an effective approach to address this issue is important. In this work, we studied the effect of additional present cations and dissolved oxygen on the stability of LiFePO4, using a rocking chair cell configuration to eliminate the effect of the other electrode. We found that adding Ca2+ to the solution and dissolved oxygen aggravate the capacity fading of LiFePO4, whereas Na+ and Mg2+ do not show an obvious influence on the stability of LiFePO4. By continuous nitrogen-flushing of the electrolyte and carbon coating of the electrode material, the stability of LiFePO4 was significantly enhanced. The lithium extraction capacity of LiFePO4/C is 21 mgLi gelectrode−1 with an energy consumption of 3.03 ± 0.5 W h molLi−1 and capacity retention of 82% in 10 cycles in 5 mM LiCl + 50 mM NaCl solution at a cell voltage range of −0.5 V to +0.5 V.
DOI of the first publication: 10.1039/D1SE00450F
URL of the first publication:!divAbstract
Link to this record: hdl:20.500.11880/31406
ISSN: 2398-4902
Date of registration: 22-Jun-2021
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Chemie
NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Guido Kickelbick
NT - Prof. Dr. Volker Presser
Collections:Die Universitätsbibliographie

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