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Title: Synthesis and Mg2+ deintercalation in manganese spinel nanocrystals

Journal Article · · Journal of Solid State Chemistry
 [1];  [2];  [3]; ORCiD logo [1]; ORCiD logo [4];  [5]; ORCiD logo [3];  [2]; ORCiD logo [1]
  1. Univ. of Illinois, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR); Univ. of Illinois, Chicago, IL (United States)
  4. Univ. of Illinois, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR); Pusan National Univ., Busan (Korea, Republic of)
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Transition metal oxides are promising materials as cathodes for divalent batteries with high capacity under high voltage. A major challenge is the sluggish kinetics of intercalation of divalent cations into the oxide host. Tailoring of the size, composition and crystal structure of oxides is a necessary strategy to alleviate these barriers, which challenges our control of their synthesis. In this work, we selectively synthesize spinel-type MgxMn3-xO4 nanocrystals with different Mg/Mn ratios and investigate their ability to electrochemically shuttle Mg2+ ions. Crystal-chemical characterization of the reaction outcomes was conducted with X-ray diffraction, X-ray absorption spectroscopy, electron microscopy, and elemental analysis. Both 5 nm thick MgMn2O4 nanosheets and 10 nm Mg0.41Mn2.59O4 nanocubes underwent reversible Mg2+ deintercalation, yet no obvious reaction was observed in 60 nm Mg1.2Mn1.8O4 nanocubes. Our results suggest that both the size of the spinel nanocrystals and the Mg/Mn ratios play a role in the observed behaviour. The advances in the synthesis of spinel oxide nanocrystals achieved, and their correlation with Mg2+ deintercalation, pave the way toward the precise synthesis of multivalent cathode materials that fundamentally overcome barriers to practical application.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; NRF-2021R1C1C1005446; NRF-2018R1A5A1025594; DMR-0959470
OSTI ID:
1961407
Journal Information:
Journal of Solid State Chemistry, Vol. 315; ISSN 0022-4596
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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