The Li+ group at the Department of Materials Science and Engineering focuses on ion insertion electrochemistry for energy storage and information storage. Ion insertion electrochemistry uses electrical current and voltage to dynamically tune the chemical and redox state of a material, such as from LiCoO2 to Li0.5CoO2, from WO3 to H0.2WO3, and from Ta2O5 to Ta2O4. We exploit ability to add and remove atoms from the host structure to store a high density of energy for batteries and to store a high density of information for redox memory. It also allows for dynamic, analogue, and non-volatile tuning of material properties using electrical controls. Our interdisciplinary approach combines electrochemistry with microfabrication to develop structures that elucidate materials and electrochemical properties as well as engineer novel devices and architectures.

Our research follows hypothesis-based scientific inquiry: we observe unexplained phenomena, hypothesize possible explanations, and conduct experiments to verify such hypotheses and explain the phenomena. In utilizing the scientific method, we are heirs to a rich legacy of scientists and engineers.

There are 1-4 funded positions for new PhD students starting Fall 2022. PhD students admitted to or enrolled at a U-M department should reach out to Yiyang at the earliest convenience. Prospective postdoctoral scholars should email Yiyang directly at yiyangli@umich.edu. Additionally, we are always recruiting motivated master’s and undergraduate students. Please include your CV in all inquiries. Contact Yiyang for any questions, notes, or requests.

A list of equipment is written in this document. Photos coming soon.