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Probing the Li Insertion Mechanism of ZnFe2O4 in Li-Ion Batteries: A Combined X-Ray Diffraction, Extended X-Ray Absorption Fine Structure, and Density Functional Theory Study [Probing the Li insertion mechanism of ZnFe2O4 in Li ion batteries: A combined XRD, EXAFS, and DFT study]

Journal Article · · Chemistry of Materials

Here, we report an extensive study on fundamental properties that determine the functional electrochemistry of ZnFe2O4 spinel (theoretical capacity of 1000 mAh/g). For the first time, the reduction mechanism is followed through a combination of in situ X-ray diffraction data, synchrotron based powder diffraction, and ex-situ extended X-ray absorption fine structure allowing complete visualization of reduction products irrespective of their crystallinity. The first 0.5 electron equivalents (ee) do not significantly change the starting crystal structure. Subsequent lithiation results in migration of Zn2+ ions from 8a tetrahedral sites into vacant 16c sites. Density functional theory shows that Li+ ions insert into 16c site initially and then 8a site with further lithiation. Fe metal is formed over the next eight ee of reduction with no evidence of concurrent Zn2+ reduction to Zn metal. Despite the expected formation of LiZn alloy from the electron count, we find no evidence for this phase under the tested conditions. Additionally, upon oxidation to 3 V, we observe an FeO phase with no evidence of Fe2O3. Electrochemistry data show higher electron equivalent transfer than can be accounted for solely based on ZnFe2O4 reduction indicating excess capacity ascribed to carbon reduction or surface electrolyte interphase formation.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Mesoscale Transport Properties (m2M)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704; SC0012673
OSTI ID:
1376672
Alternate ID(s):
OSTI ID: 1368319
Report Number(s):
BNL--114141-2017-JA
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 10 Vol. 29; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Size-dependent kinetics during non-equilibrium lithiation of nano-sized zinc ferrite journal January 2019
Preparation of ZnFe2O4/α-Fe2O3 Nanocomposites From Sulfuric Acid Leaching Liquor of Jarosite Residue and Their Application in Lithium-Ion Batteries journal September 2018
Rationalization of Diversity in Spinel MgFe 2 O 4 Surfaces journal September 2019
In Situ Probing Multiple-Scale Structures of Energy Materials for Li-Ion Batteries journal May 2019
Size dependent behavior of Fe 3 O 4 crystals during electrochemical (de)lithiation: an in situ X-ray diffraction, ex situ X-ray absorption spectroscopy, transmission electron microscopy and theoretical investigation journal January 2017
Electrochemical (de)lithiation of silver ferrite and composites: mechanistic insights from ex situ, in situ, and operando X-ray techniques journal January 2017
A first principles study of spinel ZnFe 2 O 4 for electrode materials in lithium-ion batteries journal January 2017
High-performance NO 2 -gas sensing of ultrasmall ZnFe 2 O 4 nanoparticles based on surface charge transfer journal January 2019
Probing enhanced lithium-ion transport kinetics in 2D holey nanoarchitectured electrodes journal August 2018
Incorporation of Alloy-de-Alloy Phase with Conversion Based Manganese Oxide to Enable High and Stable Capacity and Density Functional Theory Study of CdMn 2 O 4 journal January 2018

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