Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (9): 929-935.DOI: 10.15541/jim20200525

• RESEARCH ARTICLE • Previous Articles     Next Articles

Three-dimensional Porous Biogenic Si/C Composite for High Performance Lithium-ion Battery Anode Derived from Equisetum Fluviatile

LI Kunru1(), HU Xinghui1, ZHANG Zhengfu1, GUO Yuzhong1(), HUANG Ruian2()   

  1. 1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
    2. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China
  • Received:2020-09-08 Revised:2020-11-08 Published:2021-09-20 Online:2020-12-10
  • Contact: GUO Yuzhong, professor. E-mail: yzguocn62@sina.com; HUANG Ruian, associate professor. E-mail: hruian@siom.ac.cn
  • About author:LI Kunru(1996-), male, Master candidate. E-mail: likunru@stu.kust.edu.cn
  • Supported by:
    National Natural Science Foundation of China(51464025)

Abstract:

Silicon-based materials are one of the most promising anode materials for lithium-ion batteries (LIBs) because of their theoretical capacity which is ten times higher than that of conventional graphite. However, the complex fabrication process and the high cost of silicon-based nanomaterials limit their practical application. In this study, equisetum fluviatile was used as raw material to prepare a three-dimensional porous biogenic Si/C composite (3D-bio-Si/C) by deep reduction, mild oxidation and carbon coating processes. The three-dimensional porous structure not only allows rapid diffusion of Li+, but also provides enough voids to accommodate the volume change on Li+ insertion and extraction. Benefiting from the abundant internal porosity and the high-strength outer carbon film of the three-dimensional porous structure, the obtained 3D-bio-Si/C shows remarkable electrochemical performance. This 3D-bio-Si/C can deliver reversible specific capacity of 1243.2 mAh/g at a current density of 1 A/g, and maintain 933.4 mAh/g after 400 cycles. This low-cost, scalable, green and sustainable route to synthesize high-performance silicon-based anode material derived from equisetum fluviatile lays a foundation for the commercial preparation of Si based lithium-ion battery anode materials.

Key words: equisetum fluviatile, lithium-ion battery, porous silicon, silicon/carbon composite, anode material

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