Enabling the ability of Li storage at high rate as anodes by utilizing natural rice husks-based hierarchically porous SiO2/N-doped carbon composites
Feng, Yi, Liu, Li, Liu, Xiaoyang, Teng, Yifei, Li, Yixin, Guo, Yutong, Zhu, Yanchao, Wang, Xiaofeng and Chao, Yimin (2020) Enabling the ability of Li storage at high rate as anodes by utilizing natural rice husks-based hierarchically porous SiO2/N-doped carbon composites. Electrochimica Acta, 359. ISSN 0013-4686
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Abstract
One of the greatest challenges in developing SiO 2/C composites as anode materials in lithium ion batteries (LIBs) is to improve the ability of Li storage at high rate over long-term cycles. Herein, biomass rice husks-based hierarchically porous SiO 2/N-doped carbon composites (BM-RH-SiO 2/NC) were prepared by ball mill and thermal treatment. BM-RH-SiO 2/NC can still retain a reversible capacity of 556 mAh g −1 over 1000 cycles at a high current of 1.0 A g −1. At 5.0 A g −1 the capacity is kept as high as 402 mAh g −1. This impressively long-term cyclic performance and high-rate capability of BM-RH-SiO 2/NC can be ascribed to the synergetic effect between the natural SiO 2 nanoparticles (< 50 nm) and the NC layer. The coating NC layer can not only effectively mitigate the volume strain during charge-discharge process to offer stably cyclic performance but also improve the electrical conductivity. Furthermore, the hierarchical porosity and better electrolyte wettability offer the rapid Li + diffusion and electron transfer, which enhance the pseudocapacitive behavior of whole electrode material and then guarantee fast electrochemical kinetics. Importantly, the unique Li-storage mechanism of active SiO 2 in BM-RH-SiO 2/NC composite was formed and found, which further validates the improved electrochemical capability.
Item Type: | Article |
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Uncontrolled Keywords: | electrochemical performance,hierarchical porosity,li-storage mechanism,rice husks,n-doped carbon,chemical engineering(all),electrochemistry ,/dk/atira/pure/subjectarea/asjc/1500 |
Faculty \ School: | Faculty of Science > School of Computing Sciences Faculty of Science > School of Chemistry |
Related URLs: | |
Depositing User: | LivePure Connector |
Date Deposited: | 25 Aug 2020 00:06 |
Last Modified: | 02 Apr 2021 01:33 |
URI: | https://ueaeprints.uea.ac.uk/id/eprint/76565 |
DOI: | 10.1016/j.electacta.2020.136933 |
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