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Title: Probing the failure mechanism of nanoscale LiFePO{sub 4} for Li-ion batteries

LiFePO{sub 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 and electron energy loss spectroscopy to study the gradual capacity fading mechanism of LiFePO{sub 4} materials. We found that upon prolonged electrochemical cycling of the battery, the LiFePO{sub 4} cathode shows surface amorphization and loss of oxygen species, which directly contribute to the gradual capacity fading of the battery. The finding can guide the design and improvement of LiFePO{sub 4} cathode for high-energy and high-power rechargeable battery for electric transportation.
Authors:
; ;  [1] ;  [2] ;  [3] ; ;  [2]
  1. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352 (United States)
  2. Energy and Environmental Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352 (United States)
  3. (China)
Publication Date:
OSTI Identifier:
22402481
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMORPHOUS STATE; CATHODES; ELECTROCHEMISTRY; ENERGY-LOSS SPECTROSCOPY; IRON COMPOUNDS; LITHIUM COMPOUNDS; LITHIUM ION BATTERIES; NANOSTRUCTURES; OXYGEN; PHOSPHATES; TRANSMISSION ELECTRON MICROSCOPY