CoO@N‐Doped Carbon Composite Nanotubes as Excellent Anodes for Lithium‐Ion Batteries

Abstract

In this work, we report the successful fabrication a new type of CoO@N‐doped carbon matrix composite nanotubes (CoO@NC Ntm) using Co(CO3)0.5(OH)⋅0.11H2O needlelike nanorods as the self‐sacrifice templates and polypyrrole as carbon and nitrogen sources. The preparation process is facile and efficient. CoO nanoparticles are homogeneously embedded in the N‐doped carbon nanotube matrix. Combining the benefits of the N‐doped carbon matrix and the special architecture, CoO@NC Ntm delivers a superior long‐term cycling stability and high‐rate performance as the anode material for lithium‐ion batteries. Even when tested at a higher current density of 2000 mA g−1, a reversible capacity of 523.4 mAh g−1 can be retained after 1000 cycles, with capacity retention of almost 100 % from 2 to 1000 cycles. This work may shed light on the fabrication of other oxide materials @N‐doped carbon matrix composites for energy‐storage applications.

Supercritical CO2 Assisted Solvothermal Preparation of CoO/Graphene Nanocomposites for High Performance Lithium-Ion Batteries

“…The O 1s peak also can be split into three components at 530.0, 531.7 and 533.4 eV, which related to the Co-O bond in CoO, residual oxygen on graphene and Co-O-C bonds between CoO and graphene, respectively. The existence of the Co-O-C covalent bond indicates a strong interaction between CoO and graphene [ 42 , 43 , 44 ]. The content of Co-O-C bonds in CoO/G-sc can be calculated as 48.6%, which is much higher than that of CoO/G-a (39.5%).…”

The impacts of nitrogen doping on the electrochemical hydrogen storage in a carbon

“…In addition, the lone pair electrons of each N atom are able to offer negative charges for the delocalized π system of sp 2 hybrid carbon, thus enhancing the electronic transmission as well as improving the conductivity and chemical activities of the carbon materials. 19,39,40,44,45,[48][49][50][51][52][53][54] For the carbon materials, the electron rich property of N atoms is not only propitious to reduce the valence band, but also can strengthen the chemical stability. 55 Furthermore, the nitrogen doping can boost the Lewis and Bronsted basicity of the carbon materials, which can be attributed to the significant improvement of surface hydrophilicity.…”

“…55 Furthermore, the nitrogen doping can boost the Lewis and Bronsted basicity of the carbon materials, which can be attributed to the significant improvement of surface hydrophilicity. 39,48,49,51,52 Moreover, the higher electronegativity of N atoms than that of C atoms, leading to the lower electron density of C atoms near N atoms, which also makes H atoms with electrondonating property more favorable for adsorption on C atoms. Zhu et al 56 studied the interaction between H atom and N-doped carbon materials through the density function theory (DFT).…”

Insight into the Superior Lithium Storage Properties of Ultrafine CoO Nanoparticles Confined in a 3 D Bimodal Ordered Mesoporous Carbon CMK‐9 Anode

“…Although improvements in electrochemical performances have been made by designing various morphological nanostructures of CoO such as nanosheets, nanowires, hollow and porous structures, it is still a challenge to find a suitable electrode that can overcome the unfavorable volume expansion during Li + insertion and extraction. Efforts have been made to circumvent these problems by introducing graphite, carbon nanotube, carbon nanofiber, graphene, reduced graphene oxide, etc., along with CoO nanoparticles to make composite anodes and enhance their electrochemical performances. Recently, ordered mesoporous carbons (OMCs) with hexagonal or cubic mesopores have been employed as ideal supports to develop metal oxide nanoparticles embedded nanocomposite electrodes with improved performances .…”