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Revisiting metal fluorides as lithium-ion battery cathodes

Journal Article · · Nature Materials
 [1];  [2];  [3];  [4];  [5];  [4];  [6];  [4];  [7];  [8];  [8];  [4];  [9];  [10];  [5];  [4]
  1. Univ. of Cambridge (United Kingdom); Adolphe Merkle Inst., Fribourg (Switzerland); Univ. of Oxford (United Kingdom). Inorganic Chemistry Lab.
  2. Univ. of Cambridge (United Kingdom); Univ. of Manchester (United Kingdom)
  3. Univ. of Cambridge (United Kingdom); Univ. Complutense de Madrid (Spain)
  4. Univ. of Cambridge (United Kingdom)
  5. Univ. of Oxford (United Kingdom). Inorganic Chemistry Lab.
  6. Univ. of Cambridge (United Kingdom); Tohoku Univ., Sendai (Japan). Advanced Inst. for Materials Research
  7. Argonne National Lab. (ANL), Argonne, IL (United States)
  8. Rutgers Univ., New Brunswick, NJ (United States)
  9. State Univ. of New York (SUNY), Stony Brook, NY (United States)
  10. Adolphe Merkle Inst., Fribourg (Switzerland)
Metal fluorides, promising lithium-ion battery cathode materials, have been classified as conversion materials due to the reconstructive phase transitions widely presumed to occur upon lithiation. We challenge this view by studying FeF3 using X-ray total scattering and electron diffraction techniques that measure structure over multiple length scales coupled with density functional theory calculations, and by revisiting prior experimental studies of FeF2 and CuF2. Metal fluoride lithiation is instead dominated by diffusion-controlled displacement mechanisms, and a clear topological relationship between the metal fluoride F- sublattices and that of LiF is established. Initial lithiation of FeF3 forms FeF2 on the particle's surface, along with a cation-ordered and stacking-disordered phase, A-LixFeyF3, which is structurally related to alpha-/beta-LiMn2+Fe3+F6 and which topotactically transforms to B- and then C-LixFeyF3, before forming LiF and Fe. Lithiation of FeF2 and CuF2 results in a buffer phase between FeF2/CuF2 and LiF. Overall, the resulting principles will aid future developments of a wider range of isomorphic metal fluorides.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Engineering and Physical Sciences Research Council (EPSRC); European Commission - Marie Sklodowska-Curie Actions (MSCA); European Research Council (ERC); Royal Society United Kingdom; Swiss National Science Foundation (SNSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; SC0001294
OSTI ID:
1818446
Alternate ID(s):
OSTI ID: 1814984
OSTI ID: 1818337
Journal Information:
Nature Materials, Journal Name: Nature Materials Journal Issue: 6 Vol. 20; ISSN 1476-1122
Publisher:
Springer Nature - Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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