材料科学
石墨烯
阴极
硒化物
电化学
镁
化学工程
电解质
溶解
铜
无机化学
电极
纳米技术
冶金
物理化学
化学
工程类
硒
作者
Changliang Du,Youqi Zhu,Yuexing Zhang,Hui Peng,Jiachen Tian,Tianyu Xia,Lei Yang,Xin Liu,Xiaoqing Ma,Chuanbao Cao
标识
DOI:10.1016/j.ensm.2023.102863
摘要
Copper selenides have been recognized as one of the most promising Mg2+ host materials due to their high electrical conductivity and unique ionic displacement mechanism, yet they suffer from low magnesium storage capacity and inferior cycling stability caused by insufficient Cu+ conversion and inevitable polyselenide dissolution. Herein, the graphene-supported CuSe (CuSe@G) with strong Se-C interaction is prepared as the high-performance cathode material for rechargeable magnesium batteries. The strong Se-C interaction between CuSe monomers and graphene substrate can not only immobilize the Se species but also boost the electrochemical replacement reaction between Cu2+ and Mg2+. The highly dispersed CuSe nanoparticles on graphene can also accelerate Mg2+ diffusion rate at the cathode-electrolyte interfaces and further regulate the electrochemical reaction kinetics. Such well-designed method can significantly improve the reversible capacity from 167 to 233.7 mAh g–1 at 0.1 A g–1 current density and cycling stability (63 mAh g–1 after 1000 cycles with 0.039% capacity decay per cycle) of copper selenide cathode materials. This work presents an in-depth insight into graphene bonding strategy for fabricating superior conversion-type selenide cathodes for rechargeable magnesium batteries.
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