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Title: Stress evolution in silicon nanowires during electrochemical lithiation using in situ synchrotron X-ray microdiffraction

Silicon is a promising material for lithium-ion batteries. However, it expands by 300% on lithiation, leading to fracture. Nanostructuring of silicon is expected to be a promising method to improve the mechanical strength of the silicon electrodes. In the present work, a unique battery test cell was designed and fabricated to study the in situ stress evolution in the silicon nanowire (SiNW) electrode during electrochemical lithiation using synchrotron X-ray microdiffraction. The stress in the SiNWs at pristine state and during lithiation was evaluated using energy scans. The average stress in the pristine nanowires was found to be ~40 MPa tensile, which changed to ~325 MPa compressive on lithiation. Further, the deviatoric stress state in the SiNWs during lithiation was evaluated using Laue diffraction and the lithiated nanowires were found to be in triaxial stress state with high shear stresses. In conclusion, the technique and the findings provide new and more in-depth understanding of the stress evolution in the SiNWs during electrochemical lithiation.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1]
  1. Singapore Univ. of Technology and Design (SUTD) (Singapore)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Volume: 1; Journal Issue: 10; Journal ID: ISSN 0884-2914
Publisher:
Materials Research Society
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (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:
1503657

Tippabhotla, Sasi Kumar, Radchenko, Ihor, Stan, Camelia V., Tamura, Nobumichi, and Budiman, Arief Suriadi. Stress evolution in silicon nanowires during electrochemical lithiation using in situ synchrotron X-ray microdiffraction. United States: N. p., Web. doi:10.1557/jmr.2019.27.
Tippabhotla, Sasi Kumar, Radchenko, Ihor, Stan, Camelia V., Tamura, Nobumichi, & Budiman, Arief Suriadi. Stress evolution in silicon nanowires during electrochemical lithiation using in situ synchrotron X-ray microdiffraction. United States. doi:10.1557/jmr.2019.27.
Tippabhotla, Sasi Kumar, Radchenko, Ihor, Stan, Camelia V., Tamura, Nobumichi, and Budiman, Arief Suriadi. 2019. "Stress evolution in silicon nanowires during electrochemical lithiation using in situ synchrotron X-ray microdiffraction". United States. doi:10.1557/jmr.2019.27.
@article{osti_1503657,
title = {Stress evolution in silicon nanowires during electrochemical lithiation using in situ synchrotron X-ray microdiffraction},
author = {Tippabhotla, Sasi Kumar and Radchenko, Ihor and Stan, Camelia V. and Tamura, Nobumichi and Budiman, Arief Suriadi},
abstractNote = {Silicon is a promising material for lithium-ion batteries. However, it expands by 300% on lithiation, leading to fracture. Nanostructuring of silicon is expected to be a promising method to improve the mechanical strength of the silicon electrodes. In the present work, a unique battery test cell was designed and fabricated to study the in situ stress evolution in the silicon nanowire (SiNW) electrode during electrochemical lithiation using synchrotron X-ray microdiffraction. The stress in the SiNWs at pristine state and during lithiation was evaluated using energy scans. The average stress in the pristine nanowires was found to be ~40 MPa tensile, which changed to ~325 MPa compressive on lithiation. Further, the deviatoric stress state in the SiNWs during lithiation was evaluated using Laue diffraction and the lithiated nanowires were found to be in triaxial stress state with high shear stresses. In conclusion, the technique and the findings provide new and more in-depth understanding of the stress evolution in the SiNWs during electrochemical lithiation.},
doi = {10.1557/jmr.2019.27},
journal = {Journal of Materials Research},
number = 10,
volume = 1,
place = {United States},
year = {2019},
month = {3}
}

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