Suppression of Phase Separation in LiFePO4 Nanoparticles During Battery
  Discharge

Allen S. M.; Amine K.; Armand M.; Aziz M. J.; Balluffi R. W.; Bazant M. Z.; Bockris J. O. M.; Branicio P. S.; Burch D.; Cahn J. W.; Chen G. Y.; Chung S. Y.; Daniel A. Cogswell; Dargaville S.; Delmas C.; Dreyer W.; Dupre N.; Granasy L.; Guyer J. E.; Han B. C.; Huang H.; Huggins R. A.; Islam M. S.; Kang B.; Kao Y. H.; Karma A.; Kuwahara A.; Laffont L.; Leriche J. B.; Malik R.; Malik R.; Martin Z. Bazant; Meethong N.; Meethong N.; Morgan D.; Murau P.; Nauman E. B.; Newman J. S.; Padhi A. K.; Pasquali M.; Peng Bai; Ramana C. V.; Ravet N.; Ravet N.; Shenouda A. Y.; Singh G. K.; Srinivasan V.; Tan H. J.; Tang M.; Tang M.; Tarascon J. M.; Van der Ven A.; Wang C. S.; Whittingham M. S.; Wu X. L.; Yamada A.; Yamada A.; Zhu Y. J.

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Suppression of Phase Separation in LiFePO4 Nanoparticles During Battery Discharge

Abstract

Using a novel electrochemical phase-field model, we question the common belief that LixFePO4 nanoparticles separate into Li-rich and Li-poor phases during battery discharge. For small currents, spinodal decomposition or nucleation leads to moving phase boundaries. Above a critical current density (in the Tafel regime), the spinodal disappears, and particles fill homogeneously, which may explain the superior rate capability and long cycle life of nano-LiFePO4 cathodes.Comment: 27 pages, 8 figure

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info:doi/10.1021%2Fnl202764f

Last time updated on 20/02/2019

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