Electric Potential Distribution on Lithium Ion Battery Cathodes Measured Using Terahertz Chemical Microscopy

Toshihiko Kiwa, Yuki Akiwa, Hayato Fujita, Takashi Teranishi, Kenji Sakai, Hidetoshi Nose, Masaki Kobayashi, Keiji Tsukada

Research output: Contribution to journalArticle

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 languageEnglish
JournalJournal of Infrared, Millimeter, and Terahertz Waves, Online First
DOIs
Publication statusPublished - Nov 1 2019
Externally publishedYes

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electric batteries
lithium
cathodes
microscopy
electric potential
ions
radiation
electrodes
emitters
microscopes
lasers

Keywords

  • Lithium ion battery
  • Terahertz
  • Femtosecond laser
  • Laser microscopy

Cite this

Electric Potential Distribution on Lithium Ion Battery Cathodes Measured Using Terahertz Chemical Microscopy. / Kiwa, Toshihiko; Akiwa, Yuki; Fujita, Hayato; Teranishi, Takashi; Sakai, Kenji; Nose, Hidetoshi; Kobayashi, Masaki; Tsukada, Keiji.

In: Journal of Infrared, Millimeter, and Terahertz Waves, Online First, 01.11.2019.

Research output: Contribution to journalArticle

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AU - Sakai, Kenji

AU - Nose, Hidetoshi

AU - Kobayashi, Masaki

AU - Tsukada, Keiji

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