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Title: Probing the failure mechanism of nanoscale LiFePO₄ for Li-ion batteries

LiFePO4 is a high power rate cathode material for lithium ion battery and shows remarkable capacity retention, featuring a 91% capacity retention after 3300 cycles. In this work, we use high-resolution transmission electron microscopy (HRTEM), energy dispersive x-ray spectroscopy (EDS), and electron energy loss spectroscopy (EELS) to study the gradual capacity fading mechanism of LiFePO4 materials. We found that upon prolonged electrochemical cycling of the battery, the LiFePO4 cathode shows surface amorphization and loss of oxygen species, which directly contribute to the gradual capacity fading of the battery. The finding is of great importance for the design and improvement of new LiFePO4 cathode for high-energy and high-power rechargeable battery for electric transportation.
 [1] ;  [2] ;  [3] ;  [1] ;  [3] ;  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy and Environmental Directorate; Beijing Jiaotong University (China). School of Electrical Engineering, National Active Distribution Network Technology Research Center
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy and Environmental Directorate
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0003-6951; APPLAB; 48688
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 20
American Institute of Physics (AIP)
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
Country of Publication:
United States
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; 33 ADVANCED PROPULSION SYSTEMS Environmental Molecular Sciences Laboratory; Electron energy loss spectroscopy; LiFePO₄