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In situ XAS study of the local structure of the nano-Li2FeSiO4/C cathode

Journal Article · · JPhys Energy
 [1];  [1];  [2];  [3];  [3]
  1. Illinois Institute of Technology, Chicago, IL (United States). Dept. of Physics. CSRRI
  2. Illinois Institute of Technology, Chicago, IL (United States). Dept. of Chemistry; Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
  3. Illinois Institute of Technology, Chicago, IL (United States). Dept. of Chemistry
Despite the challenges in achieving its full theoretical capacity of reversible extraction of two Li ions, the Li2FeSiO4 (LFS) cathode shows a remarkable cycling stability once its low electronic conductivity is addressed. By studying the local structure around the iron during electrochemical cycling using in situ x-ray absorption spectroscopy (XAS), it is possible to gain insight into the factors which determine the electrochemical properties of this material. In order to practically perform in situ XAS studies, the charge/discharge of LFS was maximized using two approaches: (a) reducing the particle size of LFS samples from micro-scale to nano-scale in order to reduce the diffusion path for intercalating ions; and (b) applying a conductive coating to each nanoparticle to facilitate electron transfer. A family of LFS materials was synthesized and characterized using x-ray diffraction, and scanning electron microscopy with energy dispersive analysis for structural and morphological analysis, as well as cyclic voltammetry and cycling tests for electrochemical performance diagnosis. This material was then characterized by in situ XAS. The results provide insight into the stable electrochemical performance of LFS and suggest new synthetic routes to reaching the theoretical capacity.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Illinois Institute of Technology, Chicago, IL (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; AR0000387
OSTI ID:
1812062
Alternate ID(s):
OSTI ID: 1812926
Journal Information:
JPhys Energy, Journal Name: JPhys Energy Journal Issue: 3 Vol. 3; ISSN 2515-7655
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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