阳极
材料科学
化学工程
金属有机骨架
碳纤维
过渡金属
储能
纳米技术
金属
球体
电极
催化作用
化学
复合材料
有机化学
复合数
冶金
吸附
功率(物理)
物理
物理化学
量子力学
天文
工程类
作者
Liqin Wang,Bolin Liu,Youqi Zhu,Min Yang,Changliang Du,Zhanli Han,Xiuyun Yao,Xiaoqing Ma,Chen Cao
标识
DOI:10.1016/j.jcis.2021.12.157
摘要
Transition-metal compounds have attracted enormous attention as potential energy storage materials for their high theoretical capacity and energy density. However, the most present transition-metal compounds still suffer from severe capacity decay and limited rate capability due to the lack of robust architectures. Herein, a general metal-organic framework-derived route is reported to fabricate hierarchical carbon-encapsulated yolk-shell nickelic spheres as anode materials for sodium-ion batteries. The nickelic metal-organic framework (Ni-MOF) precursors can be in situ converted into hierarchical carbon-encapsulated Ni2P (Ni2P/C), NiS2 (NiS2/C) and NiSe2 (NiSe2/C) by phosphorization, sulfuration, and selenation reaction, respectively, and maintain their yolk-shell sphere-like morphology. The as-synthesized Ni2P/C sample can deliver much lower polarization and discharge platform, smaller voltage gap, and faster kinetics in comparison with that of the other two counterparts, and thus achieve higher initial specific capacity (3222.1/1979.3 mAh g-1) and reversible capacity of 765.4 mAh g-1 after 110 cycles. This work should provide new insights into the phase and structure engineering of carbon-encapsulated transition-metal compound electrodes via MOFs template for advanced battery systems.
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