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  • Title: "Electron-Sharing" Mechanism Promotes Co@Co3O4/CNTs Composite as the High-Capacity Anode Material of Lithium-Ion Battery.
    Author: Zhao Y, Dong W, Riaz MS, Ge H, Wang X, Liu Z, Huang F.
    Journal: ACS Appl Mater Interfaces; 2018 Dec 19; 10(50):43641-43649. PubMed ID: 30488690.
    Abstract:
    Hybridization of nanostructured cobalt oxides with carbon nanotubes (CNTs) is considered to be an operative approach to harvest high-performance anode material for lithium-ion batteries (LIBs). On the other hand, there are numerous related works, most of which adopted a "post-combination" strategy, which is not only complicated but also ecologically unpromising for using toxic acid for surface modification of CNTs. Herein, we productively fabricate Co@Co3O4/CNTs nanocomposite with excellent conductivity through arc discharge following low-temperature oxidation in air. As the anode material for LIBs, this nanocomposite shows an exceedingly high reversible capacity of 820 mA h g-1 at a current density of 0.2 A g-1 after 250 cycles, much higher than its theoretical capacity. The rate performance of the material is also outstanding, with a capacity of 760 mA h g-1 after 350 cycles at 1 A g-1 (103% of the initial capacity) and 529 mA h g-1 after 600 cycles at 2 A g-1. X-ray photoelectron spectroscopy tests are accomplished to disclose the true cause of extra capacity. And for the first time, we propose an "electron-sharing" storage mode, where extra electrons and Li+ can separate and be stored at the interface of cobalt metal/Li2O. This not only gives a reasonable revelation for this unusual capacity exceeding the theoretical value but also directs the capacitor-like electrochemical behavior extra capacity.
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