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Title: In situ tensile and creep testing of lithiated silicon nanowires

We present experimental results for uniaxial tensile and creep testing of fully lithiated silicon nanowires. A reduction in the elastic modulus is observed when silicon nanowires are alloyed with lithium and plastic deformation becomes possible when the wires are saturated with lithium. Creep testing was performed at fixed force levels above and below the tensile strength of the material. A linear dependence of the strain-rate on the applied stress was evident below the yield stress of the alloy, indicating viscous deformation behavior. The observed inverse exponential relationship between wire radius and strain rate below the yield stress indicates that material transport was controlled by diffusion. At stress levels approaching the yield strength of fully lithiated silicon, power-law creep appears to govern the strain-rate dependence on stress. These results have direct implications on the cycling conditions, rate-capabilities, and charge capacity of silicon and should prove useful for the design and construction of future silicon-based electrodes.
Authors:
;  [1] ;  [2] ;  [1] ;  [3]
  1. Institute for Applied Materials, KIT, 76344 Eggenstein-Leopoldshafen (Germany)
  2. Department of Materials Science and Engineering, MIT, Cambridge, Massachusetts 02139 (United States)
  3. (HIU), 89069 Ulm (Germany)
Publication Date:
OSTI Identifier:
22253218
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 26; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALLOYS; CREEP; LITHIUM; PLASTICITY; QUANTUM WIRES; SILICON; STRAIN RATE; STRESSES; TENSILE PROPERTIES; TESTING; YIELD STRENGTH