Increasing rigidness of carbon coating for improvement of electrochemical performances of Co3O4 in Li-ion batteries

Increasing rigidness of carbon coating for improvement of electrochemical performances of Co3O4... Carbon coating is an effective approach to enhance the electrochemical properties of transition metal oxide. Herein, we demonstrated that increasing rigidness of carbon coating by incorporating the analogue of Al oxide was able to improve the rate capability and cycling stability of Co3O4. Compared with carbon coating, a hybrid coating consisted of carbon and the analogue of Al oxide (COAl) showed increased rigidness and robustness, which can suppress the massive expansion of Co3O4 upon lithiation, and accordingly, a conductive linkage of carbon over the electrode surface could be well preserved by using a thin hybrid coating. In this way, good electrode integration was obtained together with fast electric conduction and short Li+ diffusion distance. AFM force curve, SEM observation and impedance measurement were carried out to demonstrate the feasibility of our strategy. During the tests of Li-ion batteries, C@Co3O4@COAl exhibited significantly improved rate capability (0.2–20 A g−1) and cycling stability (4000 cycles at 5 A g−1) as compared with C@Co3O4@C, thus manifesting the significant role by increasing the rigidness of carbon coating. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Carbon Elsevier

Increasing rigidness of carbon coating for improvement of electrochemical performances of Co3O4 in Li-ion batteries

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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
0008-6223
D.O.I.
10.1016/j.carbon.2016.03.027
Publisher site
See Article on Publisher Site

Abstract

Carbon coating is an effective approach to enhance the electrochemical properties of transition metal oxide. Herein, we demonstrated that increasing rigidness of carbon coating by incorporating the analogue of Al oxide was able to improve the rate capability and cycling stability of Co3O4. Compared with carbon coating, a hybrid coating consisted of carbon and the analogue of Al oxide (COAl) showed increased rigidness and robustness, which can suppress the massive expansion of Co3O4 upon lithiation, and accordingly, a conductive linkage of carbon over the electrode surface could be well preserved by using a thin hybrid coating. In this way, good electrode integration was obtained together with fast electric conduction and short Li+ diffusion distance. AFM force curve, SEM observation and impedance measurement were carried out to demonstrate the feasibility of our strategy. During the tests of Li-ion batteries, C@Co3O4@COAl exhibited significantly improved rate capability (0.2–20 A g−1) and cycling stability (4000 cycles at 5 A g−1) as compared with C@Co3O4@C, thus manifesting the significant role by increasing the rigidness of carbon coating.

Journal

CarbonElsevier

Published: Aug 1, 2016

References

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    Zhou, X.S.; Dai, Z.H.; Liu, S.H.; Bao, J.C.; Guo, Y.G.
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    Li, H.Q.; Zhou, H.S.
  • Electrochemical effects of ALD surface modification on combustion synthesized LiNi1/3Mn1/3Co1/3O2 as a layered-cathode material
    Riley, L.A.; Atta, S.V.; Cavanagh, A.S.; Yan, Y.; George, S.M.; Liu, P.
  • Ultrathin direct atomic layer deposition on composite electrodes for highly durable and safe Li-ion batteries
    Jung, Y.S.; Cavanagh, A.S.; Riley, L.A.; Kang, S.H.; Dillon, A.C.; Groner, M.D.
  • Reversible high-capacity Si nanocomposite anodes for lithium-ion batteries enabled by molecular layer deposition
    Piper, D.M.; Travis, J.J.; Young, M.; Son, S.B.; Kim, S.C.; Oh, K.H.
  • Pd(0) nanoparticle stabilized by tannin-grafted SiO2 beads and its application in liquid-hydrogenation of unsaturated organic compounds
    Huang, X.; Wang, Y.P.; Heng, Q.; Liao, X.P.; Shi, B.
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    Schofield, P.; Mbugua, D.M.; Pell, A.N.
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    Wang, Q.; Zhang, J.Y.; Chen, C.H.

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