Functional Defects in Electroceramic Materials: Session I: Defect Engineering in Ceramic Materials
Sponsored by: ACerS Electronics Division
Program Organizers: Hui Xiong, Boise State University; Hua Zhou, Argonne National Laboratory
Wednesday 10:00 AM
October 20, 2021
Room: B235
Location: Greater Columbus Convention Center
Session Chair: Vicky Doan-Nguyen, Ohio State University
10:00 AM Introductory Comments
10:05 AM Invited
Let Thermodynamics do Interfacial Engineering: Jian Luo1; 1University of California, San Diego
This talk will review and discuss the emerging opportunities to utilize the equilibrium formation of 2D interfacial phases to tailor batteries and solid electrolytes. In contrast to traditional kinetically-controlled atomic layer deposition and other interfacial engineering methods, these 2D interfacial phases form spontaneously at thermodynamic equilibria; they are also termed as “complexions” to differentiate them from thin layers of 3D bulk phases whose thicknesses are controlled by kinetic or processing parameters. In this talk, I will first introduce the basic concepts and related interfacial thermodynamics. Some of earlier studies on thermodynamics based interfacial engineering of battery cathodes and solid electrolytes [Energy Storage Materials 21: 50 (2019)] will be briefly reviewed. Recent ongoing work on nanostructured battery anode materials will be further presented. If time permits, a recent discovery of electrochemically induced grain boundary phase-like (complexion) transition [arXiv: 2012.15862] will also be discussed.
10:45 AM Invited
Accelerated Synthesis and In-situ X-ray Pair Distribution Functions of Substituted Vanadium Dioxide: Vicky Doan-Nguyen1; 1Ohio State University
In this talk, I will present rapid synthetic strategies using microwave assisted heating for vanadium dioxide, a thermochromic material possessing a metal-insulator transition temperature at 68℃. For smart windows applications, VO2 is attractive due to its semiconducting to metallic phase transition near room temperature. Below the transition temperature, it is transparent in the near-infrared, and above the transition temperature, it is translucent to near-infrared. I will include a comparison of slow furnace growth and phase-pure synthesis of VO2 and substituted VO2 via accelerated microwave-assisted heating. In-situ X-ray scattering through the phase transition reveal heating and inhomogeneities in substituted VO2 synthesized via microwave-assisted heating. The use of X-ray pair distribution functions allows us to track local structure changes due to defects that lower the metal-to-insulator transition temperature as a function of substitution concentration. I will also present challenges with cross-correlative, multi-modal characterization approaches between in-situ X-ray scattering and transmission electron microscopy.
11:15 AM Invited
Now On-Demand Only - Understanding Lithium Plating in Graphite and Silicon for Fast Charging Li-ion Battery: Tao Gao1; 1University of Utah
The ability to recharge in 10 minutes is a great challenge of Li-ion battery, but critical to the wide adoption of electric vehicles. The fundamental limitation is a side reaction, known as Li plating, that happens at the anode when charging the battery at high rate or under low temperature, because this reaction not only causes battery degradation but also increases the risk of internal shorts and safety hazards. Therefore, it is important to understand the mechanism of lithium plating, and what governs this phenomena. The graphite and silicon are the current and next-generation anode materials for Li-ion batteries. In this talk, we will share our findings on revealing the interplay of Li insertion and plating on these two materials, and discuss potential strategies to improve these materials by defect engineering to achieve fast charging.