阳极
材料科学
双金属片
化学工程
电化学
退火(玻璃)
兴奋剂
多孔性
纳米技术
微观结构
碳纤维
电极
复合材料
冶金
化学
光电子学
复合数
物理化学
金属
工程类
作者
Xin Liu,Liwen Yang,Guobao Xu,Juexian Cao
标识
DOI:10.1016/j.gee.2020.08.012
摘要
Design and preparation of dual-role anode materials with extraordinary performance for rechargeable Li/Na-ion batteries (LIBs/NIBs) remains highly challenging. Herein, three-dimensional (3D) pomegranate-like porous bimetallic NiCo2Se4 spheres with N-doped carbon (termed as [email protected]2Se4) is synthesized by solvothermal method and annealing. Microstructure investigations reveal that the [email protected]2Se4 spheres include nano-sized NiCo2Se4 particles as inner core and NiCo2Se4 with the modification of thin-walled N-doped carbon layer as inner/outer shell. The bimetallic [email protected]2Se4 spheres possess synergistic interaction of Ni/Co atoms to enhance intrinsic conductivity and electrochemical activity, unique pomegranate-like structure with an inner void space and robust shell to mitigation volume expansion, and intimate contact of N-doped carbon layer to improve interface effect and accelerate conversion kinetics. As anode materials, the [email protected]2Se4 exhibits superior lithium/sodium storage performances (1401.6 and 794.8 mA h g−1 at current density of 0.5 and 5 A g−1 after 500 cycles for LIBs as well as 433.9 mA h g−1 at 3 A g−1 after 1000 cycles and a high capability of 306.6 mA h g−1 at 20 A g−1 for NIBs). This work represents an impressive strategy for future research of bimetallic selenides as anode materials for advanced high-performance LIBs/NIBs.
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