NEES Teleseminars

Event Information

NEES Teleseminar - Yifei Mo
Wednesday, October 19, 2016
4:00 p.m.-5:00 p.m.
2168 AV Williams
For More Information:
Elizabeth Lathrop
301 405 7801
lathrop5@umd.edu

Title:  "Computation-Guided Design of Solid Electrolyte Materials and Interfaces in All-Solid-State Li-ion Batteries"

Speaker: Yifei Mo, Materials Science & Eng., UMD

Abstract

All-solid-state Li-ion battery based on solid electrolyte materials is a promising next-generation Li-ion battery technology with intrinsic safety, high energy density, and enhanced cyclability. The key problem in enabling this new battery technology is the high interfacial resistance and interfacial degradation at the solid electrolyte-electrode interfaces. In this presentation, I will show how we use computational modeling to provide unique insights into the fundamental mechanisms at these buried interfaces, which are difficult to access in experiments. I will first demonstrate using first principles computation to predict various materials properties of the solid electrolyte materials with little experimental input. In addition, we systematically investigate and compare the electrochemical stability and chemical stability of the solid electrolyte-electrode interfaces, and study how these interfaces affect the interfacial resistance, low cyclability, and mechanical failure in all-solid-state Li-ion batteries. Our computation results suggest the formation of decomposition interphase layers in all-solid-state Li-ion batteries and the significant effects of the interphase layers on the electrochemical performance of the all-solid-state Li-ion batteries. Different interfaces between solid electrolyte and electrode materials may have different problems at the interfaces, which require different interfacial engineering strategies to resolve. The mechanisms of artificial layers to improve the interfacial properties are revealed by our computation. This computational study provides novel insights and general guidance for interfacial engineering in all-solid-state Li-ion batteries.

Prof. Yifei Mo is an Assistant Professor of Materials Science and Engineering at the University of Maryland, College Park, USA. Dr. Mo’s research aims to advance the understanding, design, and discovery of engineering materials through cutting-edge computational techniques. His current research projects target critical materials problems in energy storage and conversion technologies, with emphasis on all-solid-state batteries. Dr. Mo obtained his Ph.D. degree in Materials Science from the University of Wisconsin, Madison, USA (2005-2010), and performed his postdoctoral research at Massachusetts Institute of Technology (2010-2013). His research has been published in leading peer-reviewed journals including Nature, Nature Materials, Nature Communications, Energy and Environmental Science, Advanced Energy Materials, Nano Letter, Chemistry of Materials, Physical Review B, etc.

This Event is For: Graduate • Faculty • Post-Docs

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