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Regeneration of Fully-discharged Graphite-Fluoride Lithium Primary Battery as Electrochemical Capacitor

Authors :
Soshi Shiraishi
Yoshikiyo Hatakeyama
Yasuyoshi Shiraishi
Noriaki Katagiri
Izuru Shimabukuro
Tsuyoshi Kawashima
Source :
Electrochemistry, Vol 89, Iss 2, Pp 87-93 (2021)
Publication Year :
2021
Publisher :
The Electrochemical Society of Japan, 2021.

Abstract

This paper reports that the fully-discharged graphite-fluoride Li primary battery (GF/Li battery) can be regenerated as a hybrid capacitor with a higher energy density than the electric double layer capacitor (EDLC) using an activated carbon electrode. The graphite-fluoride (GF) positive electrode of the GF/Li battery is electrochemically defluorinated during the fully-discharged process to be converted to a nanocomposite consisting of carbon and LiF particles. The nanocomposite as the discharge product behaves as a capacitor-like electrode, so the fully-discharged GF/Li battery can be stably charged/discharged as a hybrid capacitor with the capacitor-type electrode (defluorinated GF electrode) and the battery-type negative electrode (Li metal). This hybrid capacitor, i.e., “graphite-fluoride Li capacitor (GF/Li capacitor)”, exhibited the maximum volumetric energy density of 52 Wh L−1 (at the power density of 71 W L−1), which is higher than that of the EDLC and comparable to that of the Li-ion capacitor. In this paper, the improvement of the cyclability by using the graphite/Li bilayer negative electrode and the charge-discharge mechanism are also discussed for the GF/Li capacitor.

Details

Language :
English
ISSN :
21862451
Volume :
89
Issue :
2
Database :
OpenAIRE
Journal :
Electrochemistry
Accession number :
edsair.doi.dedup.....d2d801ec33f24553da9b15d9afe2ef4f