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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4921628· OSTI ID:1208728
 [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
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.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1208728
Alternate ID(s):
OSTI ID: 1226747
OSTI ID: 22402481
Report Number(s):
PNNL-SA-109000; 48688
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 20 Vol. 106; ISSN APPLAB; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (15)

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Fe valence determination and Li elemental distribution in lithiated FeO0.7F1.3/C nanocomposite battery materials by electron energy loss spectroscopy (EELS) journal January 2012
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Hierarchically Porous Monolithic LiFePO 4 /Carbon Composite Electrode Materials for High Power Lithium Ion Batteries journal November 2009
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Conflicting Roles of Nickel in Controlling Cathode Performance in Lithium Ion Batteries journal September 2012
Mitigating Voltage Fade in Cathode Materials by Improving the Atomic Level Uniformity of Elemental Distribution journal April 2014
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Lithium deintercalation in LiFePO4 nanoparticles via a domino-cascade model journal July 2008
Kinetics of non-equilibrium lithium incorporation in LiFePO4 journal July 2011
Electronically conductive phospho-olivines as lithium storage electrodes journal September 2002
Atomic resolution of lithium ions in LiCoO2 journal June 2003
Size Effects on Carbon-Free LiFePO[sub 4] Powders journal January 2006

Cited By (2)

Direct regeneration of cathode materials from spent lithium iron phosphate batteries using a solid phase sintering method journal January 2017
First-Principles Study of the Impact of Grain Boundary Formation in the Cathode Material LiFePO4 journal September 2019

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