About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
Inductance and Piezoinductance Discovered in Exfoliated-Graphite-Based Flexible Graphite Used for Batteries, Supercapacitors and Fuel Cells |
| Author(s) |
Deborah D.L. Chung, Sumon Sarkar |
| On-Site Speaker (Planned) |
Deborah D.L. Chung |
| Abstract Scope |
Exfoliated-graphite-based flexible graphite is used as current collectors, electrodes and bipolar plates in batteries, supercapacitors and fuel cells. This work discovers inductance and piezoinductance in the plane of the flexible graphite sheet. The reactance is totally inductive. Both inductance and resistance increase with decreasing thickness and increasing inter-electrode distance. Piezoinductance refers to the effect of stress/strain on the inductance and is relevant to the abovementioned functions, inductance-based sensing (including device condition sensing) and mechanical energy harvesting. The inductance increases reversibly and the resistance decreases reversibly upon normal compression. This is attributed to the microstructural change involving the tightening of the exfoliated-graphite cellular structure and the consequent enhancement of the current path tortuosity and the number of parallel conduction paths. The piezoinductance is stronger than piezoresistivity by an order of magnitude. The transverse piezoinductance is stronger than previously reported longitudinal piezoinductance of a carbon fiber tow by four orders of magnitude. |