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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Cho J,Losego MD,Zhang HG,Kim H,Zuo J,Petrov I,Cahill DG,Braun PVdoi
10.1038/ncomms5035subject
Has Abstractpub_date
2014-06-03 00:00:00pages
4035issn
2041-1723pii
ncomms5035journal_volume
5pub_type
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