材料科学
沸石咪唑盐骨架
阳极
氧化物
铜
化学工程
碳纳米管
纳米技术
金属有机骨架
锂(药物)
电极
化学
冶金
吸附
有机化学
医学
工程类
内分泌学
物理化学
作者
Jia Lin,Chenghui Zeng,Xiaoming Lin,R. Chenna Krishna Reddy,Ji-Liang Niu,Jincheng Liu,Yue‐Peng Cai
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2019-08-19
卷期号:7 (18): 15684-15695
被引量:25
标识
DOI:10.1021/acssuschemeng.9b03744
摘要
Transition metal oxides (TMOs), identified as a potential candidate for high-energy anode materials for state-of-the-art lithium-ion batteries (LIBs), suffer from the inherent defects of low electronic conductivity and dramatic volume variation, hindering their practical applications. It is still a great challenge to synthesize novel TMO anodes with satisfactory lithium storage performance. Herein, trimetallic Zn–Co–Cu-zeolitic imidazolate framework is designed with carbon nanotubes (CNTs) and copper foam (CF) serving as multifunctional bridges by postsynthetic metal-ion exchange and in situ solvothermal growth. After annealing, a novel trimetallic metal–organic framework (MOF)-derived polymetallic oxide, Cu0.39Zn0.14Co2.47O4–CuO@CNTs/CF hybrid, was successfully prepared. The introduction of conductive CNTs and a three-dimensional (3D) CF substrate effectively boosts the mechanical robustness and electronic conductivity of metal oxide composites, accelerates the lithium-ion diffusion, and reduces the impedance during the lithiation/delithiation process. When it is directly tested as a conductive-agent-free and binder-free electrode in LIBs, it presents distinguished long-cycling stability and high-rate capacity via the dominant mechanism of pseudocapacitive charge storage and the “electron-shared metal-Li+ double electric layer”. The as-prepared Cu0.39Zn0.14Co2.47O4–CuO@CNTs/CF electrode delivers a high specific capacity of 1649 mAh g–1 at 0.2 A g–1 together with 1282 mAh g–1 at 5 A g–1 over 1000 cycles. The novel 3D self-supported MOF-derived polymetallic oxide synthetic strategy proposed in this work sheds light on creation of potential anode materials for next-generation LIBs.
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