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Synthesis of a zinc ferrite effectively encapsulated by reduced graphene oxide composite anode material for high-rate lithium ion storage.
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2020-07-05 , DOI: 10.1016/j.jcis.2020.07.004
Qingke Tan 1 , Chao Wang 1 , Yangdi Cao 1 , Xuehua Liu 1 , Haijie Cao 1 , Guanglei Wu 1 , Binghui Xu 1
Affiliation  

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 (ZnFe2O4) composite anode material (ZnFe2O4/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-Fe2O3 nanoparticles are formed neighboring the ZnO nanoparticles. In this step, 3D porous RGO supporting framework are constructed with γ-Fe2O3@ZnO nanoparticles effectively encapsulated between the RGO layers. Finally, the well-designed γ-Fe2O3@ZnO/RGO intermediate product undergoes a thermal treatment to allow a solid-state reaction and obtains the ZnFe2O4/RGO composite. At a high current rate of 1.0 A·g−1, the ZnFe2O4/RGO composite exhibits an inspiring reversible capacity of 1022 mAh·g−1 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.



中文翻译:

还原型氧化石墨烯复合负极材料有效封装的铁氧体锌的合成,用于高速率锂离子存储。

通过由导电石墨烯片构成的3D多孔骨架有效地固定纳米级电化学活性材料,可增强锂离子存储性能。在此,通过简单有效的方法来制造还原型氧化石墨烯(RGO)担载的铁氧体锌(ZnFe 2 O 4)复合负极材料(ZnFe 2 O 4 / RGO)。首先,氧化还原反应发生在几层氧化石墨烯(GO)薄板上的含氧官能团和受控数量的金属Zn原子之间。ZnO纳米颗粒在原位成核并直接在GO片上生长。其次,GO片完全由丰富Fe原子减少,并且相应的γ-的Fe 2 ö在ZnO纳米颗粒附近形成3个纳米颗粒。在该步骤中,3D多孔RGO支撑框架被构造用了γ-Fe 2 ö 3有效地包封在RGO层之间@ZnO纳米颗粒。最后,精心设计了γ-Fe 2 ö 3 @的ZnO / RGO中间产物经历热处理,以允许固态反应,并且获得的ZnFe 2 ø 4 / RGO复合材料。在1.0 A·g -1的高电流速率下,ZnFe 2 O 4 / RGO复合材料的吸气可逆容量为1022 mAh·g -1连续500次循环作为锂离子电池的负极材料。并且在这项工作中研究了对有吸引力的锂存储性能的见解。

更新日期:2020-07-13
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