Three-Dimensional Interconnected Spherical Graphene Framework/SnS Nanocomposite for Anode Material with Superior Lithium Storage Performance: Complete Reversibility of Li2S

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• 作者：Bing Zhao ; Zhixuan Wang ; Fang Chen ; Yaqing Yang ; Yang Gao ; Lu Chen ; Zheng Jiao ; Lingli Cheng‡span> ; Yong Jiang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 18, 2017
• 年：2017
• 卷：9
• 期：2
• 页码：1407-1415
• 全文大小：659K
• ISSN：1944-8252

文摘

Three-dimensional (3D) interconnected spherical graphene framework-decorated SnS nanoparticles (3D SnS@SG) is synthesized by self-assembly of graphene oxide nanosheets and positively charged polystyrene/SnO<sub>2sub> nanospheres, followed by a controllable in situ sulfidation reaction during calcination. The SnS nanoparticles with diameters of ∼10–30 nm are anchored to the surface of the spherical graphene wall tightly and uniformly. Benefiting from the 3D interconnected spherical graphene framework and subtle SnS nanoparticles, the generated Li<sub>2sub>S could keep in close contact with Sn to make possible the in situ conversion reaction SnS + 2Li<sup>+sup> + 2e<sup>–sup> ↔ Sn + Li<sub>2sub>S. As a result, the 3D SnS@SG as the anode material for lithium ion batteries shows a high initial Coulombic efficiency of 75.3%. Apart from the irreversible capacity loss of 3D spherical graphene, the initial Coulombic efficiency of SnS in the 3D SnS@SG composite is as high as 99.7%, demonstrating the almost complete reversibility of Li<sub>2sub>S in this system. Furthermore, it also exhibits an excellent reversible capacity (800 mAh g<sup>–1sup> after 100 cycles at 0.1 C and 527.1 mAh g<sup>–1sup> after 300 cycles at 1 °C) and outstanding rate capability (380 mAh g<sup>–1sup> at 5 °C).