Abstract
A terahertz chemical microscope has been developed to visualize electric
potential distribution on lithium ion battery cathodes during battery
operation. A sensing plate comprising a Si film grown epitaxially on a
sapphire substrate was used as a terahertz emitter. The amplitude of
terahertz radiation from the sensing plate could be related to the
electric potential at the exact point where a femtosecond laser
illuminated. Here, the sensing plate was integrated into a conventional
can-type lithium ion battery and terahertz radiation from the sensing
plate was observed during battery operation between 2.7 and 4.2 V. By
scanning the laser, the distribution of terahertz amplitude radiated
from the sensing plate was observed, which could be related to the
electric potential distribution on the electrodes of the batteries.
Localized electric potential could be visualized as the amplitude of
terahertz radiation generated in the sensing plate, which was integrated
beneath the battery electrode.
| Original language | English |
|---|---|
| Pages (from-to) | 430-437 |
| Journal | Journal of Infrared, Millimeter, and Terahertz Waves |
| Volume | 41 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Nov 1 2019 |
| Externally published | Yes |
Keywords
- Lithium ion battery
- Terahertz
- Femtosecond laser
- Laser microscopy
ASJC Scopus subject areas
- Radiation
- Instrumentation
- Condensed Matter Physics
- Electrical and Electronic Engineering
