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Author

Jung, Yoon Seok
Electrochemical Solid-State Energy Storage Lab
Research Interests
  • Batteries, All-solid-state batteries, solid electrolytes, electrodes, atomic layer deposition,energy storage devices

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Extremely conductive RuO2-coated LiNi0.5Mn1.5O4 for lithium-ion batteries

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Title
Extremely conductive RuO2-coated LiNi0.5Mn1.5O4 for lithium-ion batteries
Author
Jung, Sung HoKim, Dong HyeonBrüner, PhilippLee, HyeyounHah, Hoe JinKim, Seok KooJung, Yoon Seok
Keywords
Battery;  Lithium;  Coating;  Conductivity;  Cathode;  Rate capability
Issue Date
201704
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.232, no., pp.236 - 243
Abstract
An unprecedentedly high electronic conductivity of 0.27 S cm−1 is achieved by depositing 0.56 wt% crystalline RuO2 on LNMO via a wet-chemical route. Systematic assessment of the electrochemical performance of bare and RuO2-coated LNMO electrodes unambiguously demonstrates that the high electronic conductivity of RuO2 enables significant enhancement in rate capability. These improvements are dramatic for the electrodes in which extremely low amounts of carbon additives are included and/or the loading amount is high. This finding highlights the importance of electronic conduction in composite electrodes, not only for high power but also for high energy density. The RuO2-coated LNMO electrode with 1 wt% carbon additives exhibits a high capacity of 100 mA h g−1 at 1C in the range 3.0–5.0 V (vs. Li/Li+). This result is in sharp contrast to the negligible capacity exhibited by the bare LNMO electrode. In addition, the chemical/electrochemical stability of the RuO2 coating under repeated cycling is confirmed, explaining the observed improvement in durability of the RuO2-coated LNMO over the bare LNMO.
URI
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DOI
http://dx.doi.org/10.1016/j.electacta.2017.02.109
ISSN
0013-4686
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