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Title: Significantly Improved Cyclability of Conversion-Type Transition Metal Oxyfluoride Cathodes by Homologous Passivation Layer Reconstruction

Journal Article · · Advanced Energy Materials
 [1];  [1];  [2];  [3];  [4];  [3]; ORCiD logo [1]
  1. Univ. of Central Florida, Orlando, FL (United States). NanoScience Technology Center
  2. Univ. of Central Florida, Orlando, FL (United States)
  3. Oregon State Univ., Corvallis, OR (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). X‐Ray Science Division

Electrode stabilization by surface passivation has been explored as the most crucial step to develop long-cycle lithium-ion batteries (LIBs). In this work, functionally graded materials consisting of “conversion-type” iron-doped nickel oxyfluoride (NiFeOF) cathode covered with a homologous passivation layer (HPL) are rationally designed for long-cycle LIBs. The compact and fluorine-rich HPL plays dual roles in suppressing the volume change of NiFeOF porous cathode and minimizing the dissolution of transition metals during LIBs cycling by forming a structure/composition gradient. The structure and composition of HPL reconstructs during lithiation/delithiation, buffering the volume change and trapping the dissolved transition metals. As a result, a high capacity of 175 mAh g-1 (equal to an outstanding volumetric capacity of 936 Ah L-1) with a greatly reduced capacity decay rate of 0.012% per cycle for 1000 cycles is achieved, which is superior to the NiFeOF porous film without HPL and commercially available NiF2-FeF3 powders. Finally, the proposed chemical and structure reconstruction mechanism of HPL opens a new avenue for the novel materials development for long-cycle LIBs.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1607992
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 9 Vol. 10; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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