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Influence of Helium on Microstructure and Electrochemical Properties of LiFePO4 Thin Films Electrodes
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National Natural Science Foundation of China (51171124); Scientific and Technical Supporting Programs funded by Sci & Tech Department of Sichuan Province (2014GZ0004); Program for New Century Excellent Talents in University (NCET-08-0380)

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    Abstract:

    The changes of the crystal orientation and lattice defects have a considerable impact on the electrochemical performances of lithium ion electrodes. Here, a new method of controlling the crystal growth of the LiFePO4 films by helium permeation was developed. The helium-permeated LiFePO4 thin film cathodes were prepared by radio frequency (RF) magnetron sputtering deposition. The morphologies of the helium-permeated LiFePO4 samples characterized by scanning electron microscope (SEM) presented pore structure. The X-ray diffraction (XRD) results of the LiFePO4 thin film cathodes indicate that the permeation of helium results in a noticeable increase of peak intensity at the 29.81o, which is normal to the pathway for lithium ion conduction (the [010] direction). It is concluded that there exists a preferential crystal growth orientation of (010) face which is in favor for the reversible insertion/de-insertion of Li ions, and therefore leading to the improvement in electrochemical performance of LiFePO4 samples.

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[Wang Mao, Wang Yuan. Influence of Helium on Microstructure and Electrochemical Properties of LiFePO4 Thin Films Electrodes[J]. Rare Metal Materials and Engineering,2015,44(11):2702~2706.]
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  • Received:April 15,2015
  • Revised:
  • Adopted:
  • Online: July 29,2016
  • Published: