Dr. Haimei Zheng, PI
Senior Scientist
MSD, LBNL
&
Adjunct professor
MSE, UC Berkeley
My research interests are centered on understanding how nanoscale heterogeneity and fluctuations at solid-liquid interfaces impact the physical and chemical processes of materials. My research group develops and applies advanced in situ transmission electron microscopy (TEM) techniques, such as the design and fabrication of liquid cells, TEM sample stages, and other in situ apparatus, and we integrate the cutting-edge in situ imaging and image analysis with theoretical calculation to develop deep understanding of the materials dynamic phenomena at atomic/molecular level. The current research topics include nucleation, growth and transformations of materials, solid-liquid (electrode-electrolyte), solid-liquid-gas interfaces, electrocatalysis, etc. Insights garnered from this research enable novel materials synthesis, and efficient applications of materials in catalysis, batteries and other functional devices.
Atomic Dynamics of Electrified Solid-Liquid Interfaces in liquid cell TEM published in Nature; featured in LBL News.
Here is the team of microscopists~
• Haimei has been elected a Fellow of the Microscopy Society of America (MSA), Class of 2023. Link
• Imaging, understanding and controlling of Li dendrite growth. Li nanogranular growth was achieved by coating the electrodes in a liquid cell with a cationic (PDDA) polymer film. Liquid cell TEM is remarkable in revealing the mechanisms of Li dendrite suppression. In situ EDS chemical analysis of solid electrolyte interphase (SEI) on an individual nanograin was achieved for the first time. EES 13, 1832 (2020).
• Haimei received 2019 MRS Medal Award. (Link)
• We discovered novel mechanisms of 2D materials growth in solution using liquid cell TEM, Nature Materials 18, 970 (2019). (Link)
A U.S. Department of Energy National Laboratory Managed by the University of California