Electrochemically tunable thermal conductivity of lithium cobalt oxide

Jiung Cho, Mark D. Losego, Hui Gang Zhang, Honggyu Kim, Jianmin Zuo, Ivan Petrov, David G. Cahill, Paul V. Braun

Research output: Contribution to journalArticle

Abstract

Using time-domain thermoreflectance, the thermal conductivity and elastic properties of a sputter deposited LiCoO2 film, a common lithium-ion cathode material, are measured as a function of the degree of lithiation. Here we report that via in situ measurements during cycling, the thermal conductivity of a LiCoO2 cathode reversibly decreases from ∼5.4 to 3.7Wm -1 K-1, and its elastic modulus decreases from 325 to 225 GPa, as it is delithiated from Li1.0CoO2 to Li 0.6CoO2. The dependence of the thermal conductivity on lithiation appears correlated with the lithiation-dependent phase behaviour. The oxidation-statedependent thermal conductivity of electrolytically active transition metal oxides provides opportunities for dynamic control of thermal conductivity and is important to understand for thermal management in electrochemical energy storage devices.

Original languageEnglish (US)
Article number4035
JournalNature communications
Volume5
DOIs
StatePublished - Jun 3 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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