A novel ultrathin single-crystalline Bi 2 O 3 nanosheet wrapped by reduced graphene oxide with improved electron transfe
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ORIGINAL PAPER
A novel ultrathin single-crystalline Bi2O3 nanosheet wrapped by reduced graphene oxide with improved electron transfer for Li storage Mingxi Jiang 1 & Yingyi Ding 1 & Haikuo Zhang 2 & Jiahao Ren 2 & Jinjin Li 2 & Chaofan Wan 1 & Yuwen Hong 1 & Mingqiang Qi 1 & Benxing Mei 1 & Lin Deng 1 & Yaohua Wu 3 & Tianli Han 1 & Huigang Zhang 4,5 & Jinyun Liu 1 Received: 13 May 2020 / Revised: 24 June 2020 / Accepted: 24 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Two-dimensional (2D) metal oxides have been of great interest owning to their particular properties such as rapid electron transfer capability. Herein, we present a novel ultrathin single-crystalline bismuth oxide (Bi2O3) nanosheet wrapped by reduce graphene oxide (rGO), which exhibits rapid electron and Li ion transfer in Li-ion battery anode. The 2D profile of both Bi2O3 and rGO sheets enables them to contact steadily, forming a sandwiched structure, which is beneficial for the transport of electrons and Li ions. The Bi2O3@rGO anodes exhibit a capacity of 218 mAh g−1 after 100 cycles at a rate of 0.5 C, which exceeds the bare Bi2O3 and some reports about Bi2O3 anodes. In addition, density of states (DOSs) and band gap structures of the Bi2O3 wrapped with rGO have been investigated through density functional theory (DFT) calculations, which show that the band gap is improved and the electron transfer is significantly enhanced. Keywords Nanosheets . Composite . Metal oxides . Electrochemical energy storage
Introduction Depending on the increase of global energy crisis, clean energy is urgently needed in daily life and industrial production [1–4]. Rechargeable batteries are one of the most important parts of clean energies. In recent years, Li-ion batteries have been widely used in mobile electronics, electric vehicles, and large-scale power storage stations. Emerging applications require Li-ion batteries to have better performance than currently available, such
as high capacity and energy density, and long cycle life [5–9]. However, the conventional graphite anode has a low theoretical capacity, and it is possible to catch fire and cause safety problems [10–12]. Seeking possible anode candidates with stable performance and good safety has become quite important. Several metal oxides have received broad attention as potential anode materials because of their good safety, high theoretical capacity, and stability. Among them, bismuth oxide (Bi2O3) is considered a competitive candidate
Mingxi Jiang and Yingyi Ding contributed equally to this work. * Jinjin Li [email protected]
2
Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano-electronics, Center for High-Performance Computing, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
3
Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
4
Key Laboratory of Advanced Energy Materials Chemistry of the Ministry of Education, Nankai Universi
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