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33 results

Page 1 of 2

  • In-Situ Environmental TEM Study of Solid-Gas Interfacial Process in Energy Materials

  • Lianfeng Zou, Chongmin Wang
  • Journal:
    / Volume 27 / Issue S1 / August 2021
    Published online by Cambridge University Press:
    30 July 2021, pp. 1970-1971
    Print publication:
    August 2021
    • Article
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  • In situ electrochemical scanning/transmission electron microscopy of electrode–electrolyte interfaces

  • Raymond R. Unocic, Katherine L. Jungjohann, B. Layla Mehdi, Nigel D. Browning, Chongmin Wang
  • Journal:
    MRS Bulletin / Volume 45 / Issue 9 / September 2020
    Published online by Cambridge University Press:
    10 September 2020, pp. 738-745
    Print publication:
    September 2020

  • Insights into the dynamics of electrochemical processes are critically needed to improve our fundamental understanding of electron, charge, and mass transfer mechanisms and reaction kinetics that influence a broad range of applications, from the functionality of electrical energy-storage and conversion devices (e.g., batteries, fuel cells, and supercapacitors), to materials degradation issues (e.g., corrosion and oxidation), and materials synthesis (e.g., electrodeposition). To unravel these processes, in situ electrochemical scanning/transmission electron microscopy (ec-S/TEM) was developed to permit detailed site-specific characterization of evolving electrochemical processes that occur at electrode–electrolyte interfaces in their native electrolyte environment, in real time and at high-spatial resolution. This approach utilizes “closed-form” microfabricated electrochemical cells that couple the capability for quantitative electrochemical measurements with high spatial and temporal resolution imaging, spectroscopy, and diffraction. In this article, we review the state-of-the-art instrumentation for in situ ec-S/TEM and how this approach has resulted in new observations of electrochemical processes.

  • Ultra-Microtome for the Preparation of TEM Specimens from Battery Cathodes

  • Hanlei Zhang, Chongmin Wang, Guangwen Zhou
  • Journal:
    / Volume 26 / Issue 5 / October 2020
    Published online by Cambridge University Press:
    01 September 2020, pp. 867-877
    Print publication:
    October 2020

  • With the wide application of ultra-microtome sectioning in the preparation of transmission electron microscopy (TEM) specimens with bio- and organic materials, here, we report an ultra-microtome-based method for the preparation of TEM specimens from cathodes of Li-ion batteries. The ultra-microtome sectioning reduces the sample thickness to tens of nanometers and yields atomic resolution from the core region of particles of hundreds of nanometers. Analysis indicates that the mechanical cross-sectioning introduces no observable microstructural artifacts or structural damage, such as microcracking and nanoporosity. These results demonstrate the high efficiency of the ultra-microtome approach in preparing well-thinned specimens of particulate materials that allow for atomic-scale TEM imaging of a large number of sectioned particles in one single TEM specimen, thereby providing statistically significant results of the TEM analysis.

  • In-situ TEM Coupled with AFM Cantilever for Direct Observation of Li Dendrite Nucleation and Growth Under Stress

  • Yang He, Wu Xu, Chongmin Wang
  • Journal:
    / Volume 26 / Issue S2 / August 2020
    Published online by Cambridge University Press:
    30 July 2020, pp. 3038-3039
    Print publication:
    August 2020
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  • In-situ S/TEM Probing of the Coupling among Electrochemical, Thermal, and Mechanical Effect in Rechargeable Batteries

  • Chongmin Wang
  • Journal:
    / Volume 25 / Issue S2 / August 2019
    Published online by Cambridge University Press:
    05 August 2019, pp. 2164-2165
    Print publication:
    August 2019
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  • Frontiers of solid-state batteries

  • Jagjit Nanda, Chongmin Wang, Ping Liu
  • Journal:
    MRS Bulletin / Volume 43 / Issue 10 / October 2018
    Published online by Cambridge University Press:
    10 October 2018, pp. 740-745
    Print publication:
    October 2018
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  • Solid-state batteries are considered the holy grail of next-generation battery technology, meeting the ever-increasing demand for energy storage that is affordable and safe, with high energy density and long cycle life. Materials and interfaces play a critical role for their eventual success and mass commercialization. This issue of MRS Bulletin focuses on the current state of the art of solid-state electrolytes and device architectures and provides a perspective into the various materials and interfacial challenges that limit its performance and stability.

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