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Simulations of Lithium-Magnetite Electrodes Incorporating Phase Change

Journal Article · · Electrochimica Acta
 [1];  [2];  [1];  [3];  [3];  [4];  [1]
  1. Columbia Univ., New York, NY (United States). Department of Chemical Engineering
  2. Stony Brook Univ., NY (United States). Dept. of Chemistry
  3. Stony Brook Univ., NY (United States). Dept. of Chemistry and Dept. of Materials Science and Engineering
  4. Stony Brook Univ., NY (United States). Dept. of Chemistry and Dept. of Materials Science and Engineering; Brookhaven National Lab. (BNL), Upton, NY (United States). Energy Sciences Directorate
In this work, the phase changes occurring in magnetite (Fe3O4) during lithiation and voltage recovery experiments are modeled using a model that simulates the electrochemical performance of a Fe3O4 electrode by coupling the lithium transport in the agglomerate and nano-crystal length-scales to thermodynamic and kinetic expressions. Phase changes are described using kinetic expressions based on the Avrami theory for nucleation and growth. Also, simulated results indicate that the slow, linear voltage change observed at long times during the voltage recovery experiments can be attributed to a slow phase change from α-LixFe3O4 to β-Li4Fe3O4. In addition, the long voltage plateau at ~1.2 V observed during lithiation of electrodes is attributed to conversion from α-LixFe3O4 to γ-(4 Li2O + 3 Fe). Simulations for the lithiation of 6 and 32 nm Fe3O4 suggest the rate of conversion to γ-(4 Li2O + 3 Fe) decreases with decreasing crystal size.
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:
1376153
Alternate ID(s):
OSTI ID: 1413354
OSTI ID: 22652766
Report Number(s):
BNL--114104-2017-JA
Journal Information:
Electrochimica Acta, Journal Name: Electrochimica Acta Vol. 238; ISSN 0013-4686
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Multi-electron transfer enabled by topotactic reaction in magnetite journal April 2019
The Systematic Refinement for the Phase Change and Conversion Reactions Arising from the Lithiation of Magnetite Nanocrystals journal November 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

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