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
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
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Depositing User: LivePure Connector
Date Deposited: 25 Aug 2020 00:06
Last Modified: 01 Sep 2020 23:57
URI: https://ueaeprints.uea.ac.uk/id/eprint/76565
DOI: 10.1016/j.electacta.2020.136933

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