Suppression of phase separation in LiFePO4 nanoparticles during battery discharge

Peng Bai; Daniel A. Cogswell; Martin Z. Bazant

doi:10.1021/nl202764f

Suppression of phase separation in LiFePO₄ nanoparticles during battery discharge

Peng Bai
, Daniel A. Cogswell
, Martin Z. Bazant

Department of Energy, Environmental & Chemical Engineering

Research output: Contribution to journal › Article › peer-review

444 Scopus citations

Abstract

Using a novel electrochemical phase-field model, we question the common belief that Li_XFePO₄ nanoparticles always 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.

Original language	English
Pages (from-to)	4890-4896
Number of pages	7
Journal	Nano Letters
Volume	11
Issue number	11
DOIs	https://doi.org/10.1021/nl202764f
State	Published - Nov 9 2011

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title = "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 always 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.",

author = "Peng Bai and Cogswell, \{Daniel A.\} and Bazant, \{Martin Z.\}",

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AU - Bai, Peng

AU - Cogswell, Daniel A.

AU - Bazant, Martin Z.

PY - 2011/11/9

Y1 - 2011/11/9

N2 - Using a novel electrochemical phase-field model, we question the common belief that LiXFePO4 nanoparticles always 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.

AB - Using a novel electrochemical phase-field model, we question the common belief that LiXFePO4 nanoparticles always 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.

UR - https://www.scopus.com/pages/publications/80755142781

U2 - 10.1021/nl202764f

DO - 10.1021/nl202764f

M3 - Article

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AN - SCOPUS:80755142781

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VL - 11

SP - 4890

EP - 4896

JO - Nano Letters

JF - Nano Letters

IS - 11

ER -

Suppression of phase separation in LiFePO₄ nanoparticles during battery discharge

Abstract

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