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Microstructure of carbon derived from mangrove charcoal and its application in Li-ion batteries |
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| Authors: | Tao Liu Wenming Qiao Isao Mochida |
| Affiliation: | a School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100083, China b College of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China c Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga, Fukuoka 816-8580, Japan |
| Abstract: | In this study, the microstructure of mangrove-charcoal-derived carbon (MC) was studied using XRD, STM and TEM. MC was found to consist of aligned quasi-spherical structural units with diameters of around 5-20 nm. It shows typical hard carbon characteristics, including a strongly disoriented single graphene layer and BSU, formed by two or three graphene layers stacked nearly parallel. Some curved and faceted graphene layers, especially closed carbon nanoparticles with fullerene-like, were observed in the as-prepared samples. MC was also evaluated as an anodic material for Li-ion batteries. MC carbonized at 1000 °C possessed the highest available discharge capacity (below 0.5 V) of 335 mAh g−1, the high first-cycle coulombic efficiency of 73.7%, good rate and cyclic capability and PC-based electrolyte compatibility. 7Li nuclear magnetic resonance (NMR) spectra of fully lithiated mangrove charcoal-derived carbons indicated the co-existence of three Li species. |
| Keywords: | Biomass-derived carbon Charcoal Carbonization Nuclear magnetic resonance Electrochemical properties |
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