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Direct evidence of concurrent solid-solution and two-phase reactions and the nonequilibrium structural evolution of LiFePO4

Journal Article


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Abstract


  • Lithium-ion batteries power many portable devices and in the future are likely to play a significant role in sustainable-energy systems for transportation and the electrical grid. LiFePO4 is a candidate cathode material for second-generation lithium-ion batteries, bringing a high rate capability to this technology. LiFePO4 functions as a cathode where delithiation occurs via either a solid-solution or a two-phase mechanism, the pathway taken being influenced by sample preparation and electrochemical conditions. The details of the delithiation pathway and the relationship between the two-phase and solid-solution reactions remain controversial. Here we report, using real-time in situ neutron powder diffraction, the simultaneous occurrence of solid-solution and two-phase reactions after deep discharge in nonequilibrium conditions. This work is an example of the experimental investigation of nonequilibrium states in a commercially available LiFePO4 cathode and reveals the concurrent occurrence of and transition between the solid-solution and two-phase reactions

Authors


  •   Sharma, Neeraj (external author)
  •   Guo, Xianwei (external author)
  •   Du, Guodong (external author)
  •   Guo, Zaiping
  •   Wang, Jiazhao
  •   Wang, Zhaoxiang (external author)
  •   Peterson, Vanessa K. (external author)

Publication Date


  • 2012

Citation


  • Sharma, N., Guo, X., Du, G., Guo, Z., Wang, J., Wang, Z. & Peterson, V. K. (2012). Direct evidence of concurrent solid-solution and two-phase reactions and the nonequilibrium structural evolution of LiFePO4. Journal of the American Chemical Society, 134 (18), 7867-7873.

Scopus Eid


  • 2-s2.0-84860859603

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=7391&context=engpapers&unstamped=1

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/4459

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 7867

End Page


  • 7873

Volume


  • 134

Issue


  • 18

Place Of Publication


  • United States

Abstract


  • Lithium-ion batteries power many portable devices and in the future are likely to play a significant role in sustainable-energy systems for transportation and the electrical grid. LiFePO4 is a candidate cathode material for second-generation lithium-ion batteries, bringing a high rate capability to this technology. LiFePO4 functions as a cathode where delithiation occurs via either a solid-solution or a two-phase mechanism, the pathway taken being influenced by sample preparation and electrochemical conditions. The details of the delithiation pathway and the relationship between the two-phase and solid-solution reactions remain controversial. Here we report, using real-time in situ neutron powder diffraction, the simultaneous occurrence of solid-solution and two-phase reactions after deep discharge in nonequilibrium conditions. This work is an example of the experimental investigation of nonequilibrium states in a commercially available LiFePO4 cathode and reveals the concurrent occurrence of and transition between the solid-solution and two-phase reactions

Authors


  •   Sharma, Neeraj (external author)
  •   Guo, Xianwei (external author)
  •   Du, Guodong (external author)
  •   Guo, Zaiping
  •   Wang, Jiazhao
  •   Wang, Zhaoxiang (external author)
  •   Peterson, Vanessa K. (external author)

Publication Date


  • 2012

Citation


  • Sharma, N., Guo, X., Du, G., Guo, Z., Wang, J., Wang, Z. & Peterson, V. K. (2012). Direct evidence of concurrent solid-solution and two-phase reactions and the nonequilibrium structural evolution of LiFePO4. Journal of the American Chemical Society, 134 (18), 7867-7873.

Scopus Eid


  • 2-s2.0-84860859603

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=7391&context=engpapers&unstamped=1

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/4459

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 7867

End Page


  • 7873

Volume


  • 134

Issue


  • 18

Place Of Publication


  • United States