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Essential Role of Spinel ZnFe2O4 Surfaces during Lithiation

Journal Article · · ACS Applied Materials and Interfaces
Spinel zinc ferrite (ZnFe2O4) is a well-known anode material in lithium ion batteries (LIBs) due to its large theoretical capacity. However, the high potentials observed at the initial stage of lithiation observed cannot be captured using a model of Li+ intercalation into the stoichiometric ZnFe2O4 bulk. Here, using density functional theory (DFT) we report for the first time that theZnFe2O4 surfaces are responsible for the measured initial potentials. Among the three identified stable surfaces, ZnFeO2-terminated ZnFe2O4(1 1 0), O-terminated ZnFe2O4(1 1 1) and Zn-terminated ZnFe2O4(1 1 1), both (1 1 1) surfaces display higher lithiation potentials than the (1 1 0) surface, and the estimated potentials based on Zn-terminated (1 1 1) fit well with the experimental observations, while using the models based on ZnFe2O4(1 1 0) and previously ZnFe2O4 bulk, the estimated potentials are much lower. In terms of Li+ diffusion, the Zn-terminated ZnFe2O4(1 1 1) surface is the most active, where the energetically favorable saturation of Li+ on the surface is able to facilitate the process. Our results provide a new strategy for the design of LIB materials, via controlling the particle shape and the associated surface characteristics thus enhancing the discharging performance.
Research Organization:
Brookhaven National Lab. (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) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1483560
Report Number(s):
BNL--209500-2018-JAAM
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 41 Vol. 10; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Rationalization of Diversity in Spinel MgFe 2 O 4 Surfaces journal September 2019
Density Functional Theory for Battery Materials journal September 2019
A network of porous carbon/ZnCo 2 O 4 nanotubes derived from shell-hybridized worm-like micelles for lithium storage journal January 2019

Figures / Tables (6)


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