阳极
材料科学
纳米复合材料
电化学
法拉第效率
石墨烯
锂(药物)
氧化物
化学工程
碱金属
扩散
电极
纳米技术
化学
冶金
有机化学
物理化学
医学
热力学
物理
工程类
内分泌学
作者
Guotao Xiang,Jiangmei Yin,Xixi Zhang,Peiyu Hou,Xijin Xu
标识
DOI:10.1016/j.cclet.2020.12.018
摘要
Fe-based compounds with good environmental friendliness and high reversible capacity have attracted considerable attention as anode for lithium-ion batteries. But, similar to other transition metal oxides (TMOs), it is also affected by large volume changes and inferior kinetics during redox reactions, resulting in the destruction of the crystal structure and poor electrochemical performance. Here, Fe3O4/C nanospheres anchored on the two-dimensional graphene oxide as precursors are phosphated and sintered to build the multiphasic nanocomposite. XRD results confirmed the multiphasic nanocomposite composed of Fe2O3, Fe3O4 and Fe3PO7, which will facilitate the Li+ diffusion. And the carbonaceous matrix will buffer the volume changes and enhance electron conduction. Consequently, the multiphasic Fe-based anode delivers a large specific capacity of 1086 mAh/g with a high initial Coulombic efficiency of 87% at 0.1 C. It also has excellent cycling stability and rate property, maintaining a capacity retention of ∼87% after 300 cycles and a high reversible capacity of 632 mAh/g at 10 C. The proposed multiphasic structure offers a new insight into improving the electrochemical properties of TMO-based anodes for advanced alkali-ion batteries.
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