Simple self-assembly of SnS₂ entrapped graphene aerogel and its enhanced lithium storage performance

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• 作者：Hongli Tang^a ; ^b ; Xiang Qi^a ; ^b ; ^{xqi@xtu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhen Zhang^a ; ^b ; Guanjie Ai^a ; ^b ; Yundan Liu^a ; ^b ; Zongyu Huang^a ; ^b ; Jianxin Zhong^a ; ^b
• 关键词：SnS2 ; Graphene ; Self-assembly ; Lithium storage
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 May 2016
• 年：2016
• 卷：42
• 期：6
• 页码：6572-6580
• 全文大小：2570 K

文摘

In this work, SnS₂ nanoplates entrapped graphene aerogel has been successfully prepared by simple self-assembly of reduced graphene oxide obtained through mild chemical reduction. Structural and morphological investigations demonstrated that SnS₂ nanoplates are highly dispersed in the three dimensional (3D) porous graphene matrix. When served as anode material for lithium-ion batteries, the electrochemical properties of SnS₂/graphene aerogel (SnS₂/GA) were evaluated by galvanostatic discharge–charge tests, cyclic voltammetry and impedance spectroscopy measurement. Compared with pristine SnS₂, the SnS₂/GA nanocomposite achieved a much higher initial reversible capacity (1186 mAh g⁻¹), superior cyclic stability (1004 mAh g⁻¹ after 60 cycles, corresponding to 84.7% of the initial reversible capacity), as well as better rate capability (650 mAh g⁻¹ at a current density of 1000 mA g⁻¹). This significantly improved lithium storage performance can be attributed to the good integration of SnS₂ nanoplates with 3D porous graphene network, which can not only provide much more active sites and easy access for Li ions intercalation, but also prevent the aggregation of SnS₂ nanoplates and facilitate fast transportation of Li ions and surface electrons during the electrochemical process.