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Rationalization of Diversity in Spinel MgFe2O4 Surfaces

Journal Article · · Advanced Materials Interfaces
 [1];  [1];  [1];  [2];  [2]
  1. Stony Brook Univ., NY (United States)
  2. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Spinel magnesium ferrite (MgFe2O4) is a prospective anode material for lithium ion batteries (LIBs). In this study, using density functional theory the first systematic study of diverse MgFe2O4 surfaces is reported in three types of spinel structures: normal, mixed, inverse, which can have significant impact on the initial lithiation. The results show that the faceting and therefore the shape of MgFe2O4 crystals strongly depend on the bulk structures. Upon going from normal, mixed to inverse spinel, the energetically preferred facets of MgFe2O4 vary from the combination of (1 0 0) and (3 1 1), soly {1 0 0} to a combination of (1 0 0), (0 0 1), (1 1 1), and (3 1 1), respectively, depending on the distribution of Mg2+ in the spinel structure. However, there is one common descriptor to the stable surfaces among all three MgFe2O4 systems: high density of Mg2+ exposed to the surface. Finally, this study rationalizes the essential effect of the substitution of Zn2+ for Mg2+ in ferrites and provides new insights on how to control the shape of ferrite materials and thus tune the performances of LIBs.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Mesoscale Transport Properties (m2mt)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012673; SC0012704
OSTI ID:
1571421
Alternate ID(s):
OSTI ID: 1567917
Report Number(s):
BNL--212233-2019-JAAM
Journal Information:
Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 22 Vol. 6; ISSN 2196-7350
Publisher:
Wiley-VCHCopyright Statement
Country of Publication:
United States
Language:
English

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