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Facile Electrochemical Mg-Ion Transport in a Defect-Free Spinel Oxide

Journal Article · · Chemistry of Materials

Inversion, i.e. Mg/Mn antisite disorder, in a spinel oxide simultaneously causes blockage of favorable Mg2+ migration paths, raising activation barriers for diffusion, and it reduces the number of redox-active metals, limiting the maximum capacity in the spinel. Here, an inversion-free spinel, MgCr1.5Mn0.5O4, was synthesized by exploiting the different intrinsic crystal field stabilization of redox-active Cr and Mn in the form of a solid-solution. The capability of the tailored spinel to reversibly (de)intercalate Mg2+ at high redox potentials was investigated. The decrease in inversion dramatically lowered the electrochemical overpotential and hysteresis, and enabled utilization of high potentials at ~2.9 V (vs. Mg/Mg2+) upon re-intercalation of Mg2+. A combination of characterization techniques reveals that the structural, compositional, and redox changes within the spinel oxide were consistent with the observed electrochemical Mg2+ activity. Quantification of selective solely to lattice Mg2+ upon the electrochemical reaction was investigated by monitoring NMR signals in isotope 25Mg-enriched spinel oxides. Our findings enhance the understanding of Mg2+ transport within spinel oxide frameworks and provide conclusive evidence for bulk Mg migration in oxide lattices at high redox potentials with minimized electrochemical hysteresis.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Joint Center for Energy Storage Research (JCESR); National Science Foundation (NSF); Brookhaven National Laboratory (BNL)
Grant/Contract Number:
AC02-06CH11357; SC0012704
OSTI ID:
1879893
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 8 Vol. 34; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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