Thickness evolution of graphite-based cathodes in the dual ion batteries via in operando optical observation

Na Li, Yaoda Xin, Haosen Chen, Shuqiang Jiao, Hanqing Jiang, Wei Li Song, Daining Fang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Graphite has been currently considered as a promising cathode material in dual ion batteries (DIBs) due to its unique features of sp2 hybridized carbon and stacked two-dimensional layered structures. However, unexpected volume/thickness changes in the graphite cathodes, induced by the intercalation/deintercalation of anions with large molecular size have been known to be a critical problem in designing DIB cells. To understand the volume/thickness changes in the DIB electrodes, in operando optical observing apparatus has been employed to observe the cross-section view of a graphite-based cathode upon cycles in the present work. The observation suggests that the cathode initially presented a huge irreversible thickness change (60%), and such thickness variation was prone to reduce and remain <20% in the following cycles. The results from both in operando observation and electrochemical characterizations collectively indicate that the greater thickness variation at initial cycle should be attributed to both anion intercalation into graphite-based cathodes and irreversible decomposition of chemical components in the DIB system. The method here highlights a universal route for fundamentally understanding the electrodes of huge volume variation.

Original languageEnglish (US)
JournalJournal of Energy Chemistry
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

Graphite
Cathodes
Ions
Intercalation
Anions
Negative ions
Electrodes
Carbon
Decomposition

Keywords

  • Cathode
  • Dual ion batteries
  • Graphite
  • In operando optical observation
  • Thickness evolution

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Electrochemistry

Cite this

Thickness evolution of graphite-based cathodes in the dual ion batteries via in operando optical observation. / Li, Na; Xin, Yaoda; Chen, Haosen; Jiao, Shuqiang; Jiang, Hanqing; Song, Wei Li; Fang, Daining.

In: Journal of Energy Chemistry, 01.01.2018.

Research output: Contribution to journalArticle

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AU - Song, Wei Li

AU - Fang, Daining

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