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
DOIs
Publication statusAccepted/In press - Jan 1 2019

Fingerprint

electric batteries
Microscopic examination
Cathodes
lithium
cathodes
microscopy
Electric potential
electric potential
Radiation
ions
Electrodes
radiation
Ultrashort pulses
Sapphire
Microscopes
electrodes
Scanning
lasers
Lithium-ion batteries
Lasers

Keywords

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

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Fujita, Hayato

AU - Teranishi, Takashi

AU - Sakai, Kenji

AU - Nose, Hidetoshi

AU - Kobayashi, Masaki

AU - Tsukada, Keiji

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AB - 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.

KW - Femtosecond laser

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