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Title: Lithium Ion Battery Performance of Silicon Nanowires With Carbon Skin

Silicon (Si) nanomaterials have emerged as a leading candidate for next generation lithium-ion battery anodes. However, the low electrical conductivity of Si requires the use of conductive additives in the anode film. Here we report a solution-based synthesis of Si nanowires with a conductive carbon skin. Without any conductive additive, the Si nanowire electrodes exhibited capacities of over 2000 mA h g-1 for 100 cycles when cycled at C/10 and over 1200 mA h g-1 when cycled more rapidly at 1C against Li metal.. In situ transmission electron microscopy (TEM) observation reveals that the carbon skin performs dual roles: it speeds lithiation of the Si nanowires significantly, while also constraining the final volume expansion. The present work sheds light on ways to optimize lithium battery performance by smartly tailoring the nanostructure of composition of materials based on silicon and carbon.
 [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [1]
  1. Univ. of Texas, Austin, TX (United States). Texas Materials Inst. (TMI)
  2. Univ. of Tokyo (Japan)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1530-6984; 48170; 47476
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nano Letters; Journal Volume: 8; Journal Issue: 1
American Chemical Society
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
Country of Publication:
United States
25 ENERGY STORAGE Silicon, Tin, Nanowires, Anode, Carbon coating, Lithium-ion battery, In situ TEM; Environmental Molecular Sciences Laboratory