Large-scale production of silicon nanoparticles@graphene embedded in nanotubes as ultra-robust battery anodes

Tao Wang, Jian Zhu, Yao Chen, Hongguan Yang, Yong Qin, Fang Li, Qifa Cheng, Xinzhi Yu, Zhi Xu, Bingan Lu

科研成果: 期刊稿件文章同行评审

67 引用 (Scopus)

摘要

The nanosized silicon for lithium-ion batteries (LIBs) is mainly limited by cracking and pulverization caused by the large volume change during deep cycles. Here, we demonstrated a commercial viability (scalable synthesis) of Si nanoparticles@graphene encapsulated in titanium dioxide nanotubes (Si@G@TiO2NTs) or carbon nanotubes (Si@G@CNTs) for the next generation of high-energy battery anodes. The nanotubes can not only provide strong protection and sufficient void space to buffer the huge volume expansion of Si nanoparticles during the charge/discharge process, but also enforce a most solid-electrolyte interphase to form on the outer surface of the nanotube instead of on individual Si nanoparticles, leading to ultrahigh coulombic efficiency and excellent cycling stability. The obtained Si@G@TiO2NT and Si@G@CNT electrodes showed a high reversible capacity of 1919.2 mA h g−1 (1.02 mA h cm−2) after 800 cycles and 2242.2 mA h g−1 (1.19 mA h cm−2) after 1000 cycles (>1 year) at the constant current density of 500 mA g−1, respectively. Furthermore, both Si@G@TiO2NT and Si@G@CNT electrodes presented superior average coulombic efficiency more than 99.9% during the whole cycling process.

源语言英语
页(从-至)4809-4817
页数9
期刊Journal of Materials Chemistry A
5
10
DOI
出版状态已出版 - 2017
已对外发布

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