Topic: High energy density lithium batteries and in situ characterization

Reporter: Prof. Zhang Yuegang, Department of Physics, Tsinghua University

Report time: 9:30-10:30 a.m, January 9th

Venue: Lecture Hall B4-215, Environment Building

Welcome all the teachers and students to attend!

Brief introduction of the speaker:

Zhang Yuegang is a professor at the Department of Physics, Tsinghua University, and a visiting researcher at the Suzhou Institute of Nanotechnology, Chinese Academy of Sciences. He graduated from the Department of Physics of Tsinghua University in 1986, received his master's degree from Tsinghua University in 1989, and received his doctor's degree from the University of Tokyo, Japan in 1996. He was a research fellow at NEC Basic Research Institute, Japan, a postdoctoral research fellow at Stanford University, a senior research fellow at Intel Corporation, chairman of the memory devices strategic research branch of the Semiconductor Technology Council, and a tenured research fellow at Berkeley National Laboratory, USA. His research interests include nanomaterials, nanometer electronic devices, lithium batteries and other electrochemical energy conversion and storage devices.

Abstract of report:

New efficient energy conversion/high-density energy storage is an essential key technology to realize the efficient utilization of renewable energy. Taking lithium-ion batteries, lithium-sulfur batteries, and magnesium-sulfur batteries as examples, this report demonstrates the key role of functionalized nanomaterials in improving the energy density and cycle stability of batteries. In order to study the structural and chemical changes of these materials in the process of battery charge and discharge, we independently developed an in-situ liquid electrochemical chip, which realized real-time electron microscope observation and synchrotron radiation X-ray energy spectrum measurement of electrode materials and their interfaces in the real electrochemical reaction process. This is beneficial for us to understand the mechanism of matter and energy transfer and its relationship with environmental factors such as electrolyte from a microscopic perspective, and provides a basis for the design of secondary batteries with higher energy density.