Synthesis of Ultrathin Si Nanosheets from Natural Clays for Lithium-Ion Battery Anodes

ACS Nano
Jaegeon RyuSoojin Park

Abstract

Two-dimensional Si nanosheets have been studied as a promising candidate for lithium-ion battery anode materials. However, Si nanosheets reported so far showed poor cycling performances and required further improvements. In this work, we utilize inexpensive natural clays for preparing high quality Si nanosheets via a one-step simultaneous molten salt-induced exfoliation and chemical reduction process. This approach produces high purity mesoporous Si nanosheets in high yield. As a control experiment, two-step process (pre-exfoliated silicate sheets and subsequent chemical reduction) cannot sustain their original two-dimensional structure. In contrast, one-step method results in a production of 5 nm-thick highly porous Si nanosheets. Carbon-coated Si nanosheet anodes exhibit a high reversible capacity of 865 mAh g(-1) at 1.0 A g(-1) with an outstanding capacity retention of 92.3% after 500 cycles. It also delivers high rate capability, corresponding to a capacity of 60% at 20 A g(-1) compared to that of 2.0 A g(-1). Furthermore, the Si nanosheet electrodes show volume expansion of only 42% after 200 cycles.

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Citations

Mar 15, 2018·Nanotechnology·Fang ZhangXinguang Xu
Nov 22, 2016·Physical Chemistry Chemical Physics : PCCP·Fazel Shojaei, Hong Seok Kang
Oct 19, 2017·Chemical Society Reviews·Yuhai DouShi Xue Dou
May 3, 2019·Scientific Reports·Hongyi XieHuaming Yang
Dec 7, 2019·Beilstein Journal of Nanotechnology·Li-Li ChenXiang-Qian Shen
Jun 20, 2017·Advanced Materials·Jialiang LangHui Wu
Apr 1, 2018·Advanced Materials·Shaozhuan HuangHui Ying Yang
Aug 22, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Lin SunHong-Bin Du
Jun 10, 2021·Advanced Science·Ye LanIvan P Parkin
Oct 8, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Kamonnart Jaa ImwisetMakoto Ogawa
Aug 2, 2017·ACS Nano·Andrew C SerinoPaul S Weiss
Aug 5, 2017·ACS Applied Materials & Interfaces·Xianhuan ZhuangDengsong Zhang

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