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

LiFePO 4 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 LiFePO 4 materials. We found that upon prolonged electrochemical cycling of the battery, the LiFePO 4 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 LiFePO 4 cathode for high-energy and high-power rechargeable battery for electric transportation.
Authors:
 [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:
Report Number(s):
PNNL-SA-109000
Journal ID: ISSN 0003-6951; APPLAB; 48688
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 20; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; 33 ADVANCED PROPULSION SYSTEMS; Environmental Molecular Sciences Laboratory; Electron energy loss spectroscopy; LiFePO₄
OSTI Identifier:
1208728
Alternate Identifier(s):
OSTI ID: 1226747