博彩平台

Synergistic Ternary Composite (Carbon/Fe₃O₄@Graphene) with Hollow Microspherical and Robust Structure for Li-Ion Storage

Xingxing Li^a , Xueying Zheng^b, Jie Shao^{a *}（邵杰）, Tian Gao^a, Qiang Shi^a, Qunting Qu^{a *}（曲群婷）

^aCollege of Chemistry, Chemical Engineering and Material Science & College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, Jiangsu 215006 (P. R. China)

^bCollege of environment, Hohai University, Nanjing, Jiangsu 210098, China Institution (P. R. China)

Chem. Eur.J.,2016, 22,376 –381

The electrode materials with hollow structure and/or graphene coating are expected to exhibit outstanding electrochemical performances in energy-storage systems. 2D graphene-wrapped hollow C/Fe₃O₄ microspheres are rationally designed and fabricated by a novel facile and scalable strategy. The core@double-shell structure SPS@FeOOH@GO (SPS: sulfonated polystyrene, GO: graphene oxide) microspheres are first prepared through a simple one-pot approach and then transformed into C/Fe₃O₄@G (G: graphene) after calcination at 500 °C in Ar. During calcination, the Kirkendall effect resulting from the diffusion/reaction of SPS-derived carbon and FeOOH leads to the formation of hollow structure carbon with Fe₃O₄ nanoparticles embedded in it. In the rationally constructed architecture of C/Fe₃O₄@G, the strongly coupled C/Fe₃O₄ hollow microspheres are further anchored onto 2D graphene networks, achieving a strong synergetic effect between carbon, Fe₃O₄, and graphene. As an anode material of Li-ion batteries (LIBs), C/Fe₃O₄@G manifests a high reversible capacity, excellent rate behavior, and outstanding long-term cycling performance (1208 mAh g⁻¹ after 200 cycles at 100 mA g⁻¹).