Unravelling electron and ion transport in graphene-protected silicon anodes

Lithium-ion batteries with silicon anodes have garnered significant attention due to their exceptional theoretical specific capacity of approximately 3,590 mAh/g at room temperature—nearly ten times that of conventional graphite anodes (~372 mAh/g). However, the practical application of silicon anodes faces challenges such as significant volume expansion during lithiation, solid-electrolyte interphase (SEI) formation, and capacity fading over multiple cycles.
My project focuses on engineering a stable, high-silicon-content anode to enhance the energy density of Li-ion batteries. The work will begin with investigating SEI growth on protected silicon in both liquid and solid-state electrolytes. Additionally, I aim to understand the ion transport mechanisms between solid-state electrolytes and electrodes. This will be followed by designing suitable solid-state electrolytes for all-solid-state Li-ion batteries with high-silicon-content anodes. The insights gained will contribute to the development of improved Li-silicon batteries.

Faculty Supervisor:

Michael Pope

Student:

Partner:

Universität Duisburg-Essen

Discipline:

Engineering

Sector:

Green/Alternative Energy; Nanotechnology

University:

University of Waterloo

Program: