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 ORCID: https://orcid.org/0000-0002-8488-2690 (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
Uncontrolled Keywords: electrochemical performance,hierarchical porosity,li-storage mechanism,rice husks,n-doped carbon,chemical engineering(all),electrochemistry,sdg 7 - affordable and clean energy ,/dk/atira/pure/subjectarea/asjc/1500
Faculty \ School: Faculty of Science > School of Computing Sciences
Faculty of Science > School of Chemistry
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Depositing User: LivePure Connector
Date Deposited: 25 Aug 2020 00:06
Last Modified: 22 Oct 2022 06:38
URI: https://ueaeprints.uea.ac.uk/id/eprint/76565
DOI: 10.1016/j.electacta.2020.136933

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