A polymer-assisted strategy for hierarchical SnS@N-doped carbon microspheres with enhanced lithium storage performance
- PDF / 1,466,085 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 33 Downloads / 242 Views
ORIGINAL PAPER
A polymer-assisted strategy for hierarchical SnS@N-doped carbon microspheres with enhanced lithium storage performance Jing Ren 1 & Yun Li 1 & Chuan Cao 1 & Rui-Peng Ren 1 & Yong-Kang Lv 1 Received: 25 May 2020 / Revised: 9 June 2020 / Accepted: 11 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Two-dimensional metal dichalcogenides show a promising potential in energy storage due to their high specific capacity. Different from the bulk SnS prepared by conventional solvothermal method, our strategy to prepare the three-dimensional (3D) hierarchical SnS@N-doped carbon (SnS@NC) microspheres assembled from ultrathin nanosheets is realized by the polymer-assisted solvothermal method. The key factor of SnS@NC microspheres is the use of polyvinylpyrrolidone, which not only acts as surfactant to obtain the hierarchical spherical structure but also is used as heteroatom sources to realize the Ndoped carbon layer coating. Compared with the bulk SnS, the enhanced electrochemical performance of SnS@NC electrode can be attributed to its 3D hierarchical structure and composition advantages, including enhanced Li+ diffusion kinetics, faster charge transfer, enough void space to accommodate the volume variation, higher electronic conductivity, and more active sites. Keywords SnS . Hierarchical structure . Nitrogen-doping . Anode . Lithium-ion battery
Introduction Lithium-ion batteries (LIBs) have been extensively employed as reliable energy supply for portable electronic devices due to their high energy density and wide operating potential window [1–4]. The electrochemical performance of LIBs is mainly determined by the electrode materials [5]. As a promising alternative to commercial graphite anode, two-dimensional (2D) metal sulfides have recently drawn a lot of attention as anode materials due to their high specific capacity [6–18]. Specially, Tin(II) sulfide (SnS) nanosheets bonded by weak van der Waals forces facilities easy intercalation/extraction of lithium ions, and thus have also been widely investigated for LIBs [19–28]. However, the development of SnS-based anode materials has been hampered by poor electrical conductivity,
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03660-z) contains supplementary material, which is available to authorized users. * Rui-Peng Ren [email protected] 1
Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
few accessible active sites, and large volume variation during the lithium insertion/extraction process. To address the above issues, developing the nanostructured SnS materials to expose more accessible active sites (SnS nanobelts [29], SnS nanoplate [30], SnS nanoparticles [31], and 3D-hierarchical SnS nanostructures [32]), or integrating carbon materials with SnS [33–37] are both considered effective methods. Compared with the bulk SnS materials, these SnS materials al
Data Loading...
