In Situ Synthesis and Unprecedented Electrochemical Performance of Double Carbon Coated Cross-Linked Co <inf>3</inf> O <inf>4</inf>

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Journal Article
ACS Applied Materials and Interfaces, 2018, 10 (49), pp. 42372 - 42379
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© 2018 American Chemical Society. Improving the structural stability and the electron/ion diffusion rate across whole electrode particles is crucial for transition metal oxides as next-generation anodic materials in lithium-ion batteries. Herein, we report a novel structure of double carbon-coated Co 3 O 4 cross-linked composite, where the Co 3 O 4 nanoparticle is in situ covered by nitrogen-doped carbon and further connected by carbon nanotubes (Co 3 O 4 NP@NC@CNTs). This double carbon-coated Co 3 O 4 NP@NC@CNTs framework not only endows a porous structure that can effectively accommodate the volume changes of Co 3 O 4, but also provides multidimensional pathways for electronic/ionic diffusion in and among the Co 3 O 4 NPs. Electrochemical kinetics investigation reveals a decreased energy barrier for electron/ion transport in the Co 3 O 4 NP@NC@CNTs, compared with the single carbon-coated Co 3 O 4 NP@NC. As expected, the Co 3 O 4 NP@NC@CNT electrode exhibits unprecedented lithium storage performance, with a high reversible capacity of 1017 mA h g -1 after 500 cycles at 1 A g -1 , and a very good capacity retention of 75%, even after 5000 cycles at 15 A g -1 . The lithiation/delithiation process of Co 3 O 4 NP@NC@CNTs is dominated by the pseudocapacitive behavior, resulting in excellent rate performance and durable cycle stability.
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