Tan Qingke, Wang Chao, Cao Yangdi, Liu Xuehua, Cao Haijie, Wu Guanglei, Xu Binghui
Institute of Materials for Energy and Environment, State Key Laboratory of Bio-Fibers and Eco-Textiles, School of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
Institute of Materials for Energy and Environment, State Key Laboratory of Bio-Fibers and Eco-Textiles, School of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
J Colloid Interface Sci. 2020 Nov 1;579:723-732. doi: 10.1016/j.jcis.2020.07.004. Epub 2020 Jul 5.
Effectively immobilizing nano-sized electrochemical active materials with a 3D porous framework constituted by conductive graphene sheets brings in enhanced lithium ion storage properties. Herein, a reduced graphene oxide (RGO) supported zinc ferrite (ZnFeO) composite anode material (ZnFeO/RGO) is fabricated by a simple and effective method. Firstly, redox reaction takes place between the oxygen-containing functional groups on few-layered graphene oxide (GO) sheets and controlled quantity of metallic Zn atoms. ZnO nanoparticles are in-situ nucleated and directly grow on GO sheets. Secondly, the GO sheets are completely reduced by abundant Fe atoms, and corresponding γ-FeO nanoparticles are formed neighboring the ZnO nanoparticles. In this step, 3D porous RGO supporting framework are constructed with γ-FeO@ZnO nanoparticles effectively encapsulated between the RGO layers. Finally, the well-designed γ-FeO@ZnO/RGO intermediate product undergoes a thermal treatment to allow a solid-state reaction and obtains the ZnFeO/RGO composite. At a high current rate of 1.0 A·g, the ZnFeO/RGO composite exhibits an inspiring reversible capacity of 1022 mAh·g for 500 consecutive cycles as anode material for lithium ion batteries. And the insight into the attractive lithium storage performance has been studied in this work.
用由导电石墨烯片构成的三维多孔框架有效地固定纳米尺寸的电化学活性材料，可增强锂离子存储性能。在此，通过一种简单有效的方法制备了还原氧化石墨烯（RGO）负载的铁酸锌（ZnFeO）复合负极材料（ZnFeO/RGO）。首先，在少层氧化石墨烯（GO）片上的含氧官能团与定量的金属Zn原子之间发生氧化还原反应。ZnO纳米颗粒原位成核并直接生长在GO片上。其次，GO片被大量的Fe原子完全还原，并在ZnO纳米颗粒附近形成相应的γ-FeO纳米颗粒。在这一步中，构建了三维多孔RGO支撑框架，γ-FeO@ZnO纳米颗粒有效地封装在RGO层之间。最后，对精心设计的γ-FeO@ZnO/RGO中间产物进行热处理，使其发生固态反应，得到ZnFeO/RGO复合材料。作为锂离子电池的负极材料，在1.0 A·g的高电流密度下，ZnFeO/RGO复合材料在500次连续循环中表现出令人鼓舞的1022 mAh·g的可逆容量。并且在这项工作中对其引人注目的锂存储性能进行了研究。
