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33 results

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  • Atomistic Reaction Kinetics and Chemistry Revealed using In Situ STEM

  • Jacob Smith, Xi Chen, Wenpei Gao
  • Journal:
    Microscopy and Microanalysis / Volume 28 / Issue S1 / August 2022
    Published online by Cambridge University Press:
    22 July 2022, pp. 1838-1839
    Print publication:
    August 2022
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  • Characterization and Growth of Quad Unit Cell Linear Defects in Potassium Tantalate

  • Tim B. Eldred, Kaveh Ahadi, Wenpei Gao
  • Journal:
    Microscopy and Microanalysis / Volume 28 / Issue S1 / August 2022
    Published online by Cambridge University Press:
    22 July 2022, pp. 1720-1721
    Print publication:
    August 2022
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  • Multiscale Electric Field Imaging of Vortices in PbTiO3-SrTiO3 Superlattice

  • Christopher Addiego, Wenpei Gao, Xiaoqing Pan
  • Journal:
    Microscopy and Microanalysis / Volume 26 / Issue S2 / August 2020
    Published online by Cambridge University Press:
    30 July 2020, pp. 466-468
    Print publication:
    August 2020
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  • In Situ Transformation of Two Dimensional MoS2 from Amorphous Precursor

  • Peter Tieu, Wenpei Gao, Xiaoqing Pan
  • Journal:
    Microscopy and Microanalysis / Volume 26 / Issue S2 / August 2020
    Published online by Cambridge University Press:
    30 July 2020, pp. 2332-2334
    Print publication:
    August 2020
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  • From ion to atom to dendrite: Formation and nanomechanical behavior of electrodeposited lithium

  • Michael A. Citrin, Heng Yang, Simon K. Nieh, Joel Berry, Wenpei Gao, Xiaoqing Pan, David J. Srolovitz, Julia R. Greer
  • Journal:
    MRS Bulletin / Volume 45 / Issue 11 / November 2020
    Published online by Cambridge University Press:
    09 July 2020, pp. 891-904
    Print publication:
    November 2020

  • Development of high energy density solid-state batteries with Li metal anodes has been limited by uncontrollable growth of Li dendrites in liquid and solid electrolytes (SEs). This, in part, may be caused by a dearth of information about mechanical properties of Li, especially at the nano- and microlength scales and microstructures relevant to Li batteries. We investigate Li electrodeposited in a commercial LiCoO2/LiPON/Cu solid-state thin-film cell, grown in situ in a scanning electron microscope equipped with nanomechanical capabilities. Experiments demonstrate that Li was preferentially deposited at the LiPON/Cu interface along the valleys that mimic the domain boundaries of underlying LiCoO2 (cathode). Cryogenic electron microscopy analysis of electrodeposited Li revealed a single-crystalline microstructure, and in situ nanocompression experiments on nano-pillars with 360–759 nm diameters revealed their average Young's modulus to be 6.76 ± 2.88 GPa with an average yield stress of 16.0 ± 6.82 MPa, ~24x higher than what has been reported for bulk polycrystalline Li. We discuss mechanical deformation mechanisms, stiffness, and strength of nano-sized electrodeposited Li in the framework of its microstructure and dislocation-governed nanoscale plasticity of crystals, and place it in the parameter space of existing knowledge on small-scale Li mechanics. The enhanced strength of Li at small scales may explain why it can penetrate and fracture through much stiffer and harder SEs than theoretically predicted.

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