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Title: Lithium Transport in an Amorphous Li xSi Anode Investigated by Quasi-elastic Neutron Scattering

Here, we demonstrate the room temperature mechanochemical synthesis of highly defective Li xSi anode materials and characterization of the Li transport. We probed the Li + self-diffusion using quasi-elastic neutron scattering (QENS) to measure the Li self-diffusion in the alloy. Li diffusion was found to be significantly greater (3.0 × 10 –6 cm 2 s –1) than previously measured crystalline and electrochemically made Li–Si alloys; the energy of activation was determined to be 0.20 eV (19 kJ mol –1). Amorphous Li–Si structures are known to have superior Li diffusion to their crystalline counterparts; therefore, the isolation and stabilization of defective Li–Si structures may improve the utility of Si anodes for Li-ion batteries.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1] ; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 121; Journal Issue: 21; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1376409

Sacci, Robert L., Lehmann, Michelle L., Diallo, Souleymane O., Cheng, Yongqiang Q., Daemen, Luke L., Browning, James F., Doucet, Mathieu, Dudney, Nancy J., and Veith, Gabriel M.. Lithium Transport in an Amorphous LixSi Anode Investigated by Quasi-elastic Neutron Scattering. United States: N. p., Web. doi:10.1021/acs.jpcc.7b01133.
Sacci, Robert L., Lehmann, Michelle L., Diallo, Souleymane O., Cheng, Yongqiang Q., Daemen, Luke L., Browning, James F., Doucet, Mathieu, Dudney, Nancy J., & Veith, Gabriel M.. Lithium Transport in an Amorphous LixSi Anode Investigated by Quasi-elastic Neutron Scattering. United States. doi:10.1021/acs.jpcc.7b01133.
Sacci, Robert L., Lehmann, Michelle L., Diallo, Souleymane O., Cheng, Yongqiang Q., Daemen, Luke L., Browning, James F., Doucet, Mathieu, Dudney, Nancy J., and Veith, Gabriel M.. 2017. "Lithium Transport in an Amorphous LixSi Anode Investigated by Quasi-elastic Neutron Scattering". United States. doi:10.1021/acs.jpcc.7b01133. https://www.osti.gov/servlets/purl/1376409.
@article{osti_1376409,
title = {Lithium Transport in an Amorphous LixSi Anode Investigated by Quasi-elastic Neutron Scattering},
author = {Sacci, Robert L. and Lehmann, Michelle L. and Diallo, Souleymane O. and Cheng, Yongqiang Q. and Daemen, Luke L. and Browning, James F. and Doucet, Mathieu and Dudney, Nancy J. and Veith, Gabriel M.},
abstractNote = {Here, we demonstrate the room temperature mechanochemical synthesis of highly defective LixSi anode materials and characterization of the Li transport. We probed the Li+ self-diffusion using quasi-elastic neutron scattering (QENS) to measure the Li self-diffusion in the alloy. Li diffusion was found to be significantly greater (3.0 × 10–6 cm2 s–1) than previously measured crystalline and electrochemically made Li–Si alloys; the energy of activation was determined to be 0.20 eV (19 kJ mol–1). Amorphous Li–Si structures are known to have superior Li diffusion to their crystalline counterparts; therefore, the isolation and stabilization of defective Li–Si structures may improve the utility of Si anodes for Li-ion batteries.},
doi = {10.1021/acs.jpcc.7b01133},
journal = {Journal of Physical Chemistry. C},
number = 21,
volume = 121,
place = {United States},
year = {2017},
month = {4}
}