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 () and Paul V. Braun ()
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Jiung Cho: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
Mark D. Losego: North Carolina State University
Hui Gang Zhang: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
Honggyu Kim: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
Jianmin Zuo: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
Ivan Petrov: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
David G. Cahill: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
Paul V. Braun: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: 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 3.7 W m−1 K−1, and its elastic modulus decreases from 325 to 225 GPa, as it is delithiated from Li1.0CoO2 to Li0.6CoO2. The dependence of the thermal conductivity on lithiation appears correlated with the lithiation-dependent phase behaviour. The oxidation-state-dependent 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.

Date: 2014
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DOI: 10.1038/ncomms5035

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