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Title: Fluid-enhanced surface diffusion controls intraparticle phase transformations

Abstract

Phase transformations driven by compositional change require mass flux across a phase boundary. In some anisotropic solids, however, the phase boundary moves along a non-conductive crystallographic direction. One such material is Li XFePO 4, an electrode for lithium-ion batteries. With poor bulk ionic transport along the direction of phase separation, it is unclear how lithium migrates during phase transformations. Here, we show that lithium migrates along the solid/liquid interface without leaving the particle, whereby charge carriers do not cross the double layer. X-ray diffraction and microscopy experiments as well as ab initio molecular dynamics simulations show that organic solvent and water molecules promote this surface ion diffusion, effectively rendering Li XFePO 4 a three-dimensional lithium-ion conductor. Phase-field simulations capture the effects of surface diffusion on phase transformation. Lowering surface diffusivity is crucial towards supressing phase separation. In conclusion, this work establishes fluid-enhanced surface diffusion as a key dial for tuning phase transformation in anisotropic solids.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [3]; ORCiD logo [5]; ORCiD logo [4];  [4];  [4];  [6];  [4]; ORCiD logo [4]; ORCiD logo [3];  [7];  [8];  [2];  [9];  [3]
  1. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Univ. of Bath, Bath (United Kingdom)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Stanford Univ., Stanford, CA (United States)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  6. National Institute of Chemistry, Ljubljana (Slovenia)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  8. Univ. of Ljubljana, Ljubljana (Slovenia)
  9. Stanford Univ., Stanford, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1490653
Alternate Identifier(s):
OSTI ID: 1512363
Grant/Contract Number:  
AC02-76SF00515; AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 17; Journal Issue: 10; Journal ID: ISSN 1476-1122
Publisher:
Springer Nature - Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Li, Yiyang, Chen, Hungru, Lim, Kipil, Deng, Haitao D., Lim, Jongwoo, Fraggedakis, Dimitrios, Attia, Peter M., Lee, Sang Chul, Jin, Norman, Moškon, Jože, Guan, Zixuan, Gent, William E., Hong, Jihyun, Yu, Young -Sang, Gaberšček, Miran, Islam, M. Saiful, Bazant, Martin Z., and Chueh, William C. Fluid-enhanced surface diffusion controls intraparticle phase transformations. United States: N. p., 2018. Web. doi:10.1038/s41563-018-0168-4.
Li, Yiyang, Chen, Hungru, Lim, Kipil, Deng, Haitao D., Lim, Jongwoo, Fraggedakis, Dimitrios, Attia, Peter M., Lee, Sang Chul, Jin, Norman, Moškon, Jože, Guan, Zixuan, Gent, William E., Hong, Jihyun, Yu, Young -Sang, Gaberšček, Miran, Islam, M. Saiful, Bazant, Martin Z., & Chueh, William C. Fluid-enhanced surface diffusion controls intraparticle phase transformations. United States. doi:10.1038/s41563-018-0168-4.
Li, Yiyang, Chen, Hungru, Lim, Kipil, Deng, Haitao D., Lim, Jongwoo, Fraggedakis, Dimitrios, Attia, Peter M., Lee, Sang Chul, Jin, Norman, Moškon, Jože, Guan, Zixuan, Gent, William E., Hong, Jihyun, Yu, Young -Sang, Gaberšček, Miran, Islam, M. Saiful, Bazant, Martin Z., and Chueh, William C. Mon . "Fluid-enhanced surface diffusion controls intraparticle phase transformations". United States. doi:10.1038/s41563-018-0168-4. https://www.osti.gov/servlets/purl/1490653.
@article{osti_1490653,
title = {Fluid-enhanced surface diffusion controls intraparticle phase transformations},
author = {Li, Yiyang and Chen, Hungru and Lim, Kipil and Deng, Haitao D. and Lim, Jongwoo and Fraggedakis, Dimitrios and Attia, Peter M. and Lee, Sang Chul and Jin, Norman and Moškon, Jože and Guan, Zixuan and Gent, William E. and Hong, Jihyun and Yu, Young -Sang and Gaberšček, Miran and Islam, M. Saiful and Bazant, Martin Z. and Chueh, William C.},
abstractNote = {Phase transformations driven by compositional change require mass flux across a phase boundary. In some anisotropic solids, however, the phase boundary moves along a non-conductive crystallographic direction. One such material is LiXFePO4, an electrode for lithium-ion batteries. With poor bulk ionic transport along the direction of phase separation, it is unclear how lithium migrates during phase transformations. Here, we show that lithium migrates along the solid/liquid interface without leaving the particle, whereby charge carriers do not cross the double layer. X-ray diffraction and microscopy experiments as well as ab initio molecular dynamics simulations show that organic solvent and water molecules promote this surface ion diffusion, effectively rendering LiXFePO4 a three-dimensional lithium-ion conductor. Phase-field simulations capture the effects of surface diffusion on phase transformation. Lowering surface diffusivity is crucial towards supressing phase separation. In conclusion, this work establishes fluid-enhanced surface diffusion as a key dial for tuning phase transformation in anisotropic solids.},
doi = {10.1038/s41563-018-0168-4},
journal = {Nature Materials},
issn = {1476-1122},
number = 10,
volume = 17,
place = {United States},
year = {2018},
month = {9}
}

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