收稿日期: 2018-03-05
网络出版日期: 2020-03-22
基金资助
国家自然科学基金资助项目(11375111);国家自然科学基金资助项目(11428410);国家自然科学基金资助项目(2017M610244)
Preparation and electrochemical properties of MnO2@ZnO/C composite
Received date: 2018-03-05
Online published: 2020-03-22
金属有机骨架 (metal-organic frameworks, MOFs) 化合物是一类由金属离子和通过配位键连接在一起的有机配体组成的晶体材料. 作为一种具有立体空间结构的功能材料, 凭借其较大的比表面积、较高的孔隙率及品种的多样性, 引起了各领域研究者的广泛关注. 以 $\beta $-MnO2 纳米棒为模板制备出 MnO2@ZIF-8 杂化纳米结构, 在惰性气氛中分步煅烧处理, 得到 MnO2@ZnO/C 复合材料. ZIF-8 中的有机配体由于高温煅烧发生裂解而产生孔道, 进而为锂离子的嵌入和脱出提供更多离子传输路径. 同时, 由于高温裂解伴随着碳的产生, 因此当使用这种复合结构物质作为电极材料时, 可以提高材料的导电率. MnO2@ZnO/C 纳米复合材料的首次放电比容量为 1 873 mA$\cdot$h$\cdot$g-1, 在电流密度为 100 mA/g 的条件下完成 100 次充放电后比容量维持在658 mA$\cdot$h$\cdot$g-1, 展现出了优良的电化学储能特性.
罗志刚, 李琦, 陈大勇, 黄守双, 胡张军, 陈志文 . MnO2@ZnO/C 复合材料的制备及电化学性能[J]. 上海大学学报(自然科学版), 2020 , 26(1) : 132 -142 . DOI: 10.12066/j.issn.1007-2861.2012
Metal-organic frameworks (MOFs) compounds are compounds formed by bonding metal centers and organic ligands through coordination bonds. As a new type of porous material, it has drawn much attention of researchers in various fields due to its large specific surface area, high porosity and variety of species. In this study, MnO2@ZnO/C hybrids are rationally synthesized by using MnO2@ZIF-8 core-shell nanowires as templates. Owing to its structural and compositional characteristics, namely, the synergistic effects between components and the conductive carbon coating, the resultant MnO2@ZnO/C hybrids exhibit good electrochemical performance as an anode material in Li-ion batteries with a first discharge specific capacity of 1 873 mA$\cdot$h$\cdot$g-1 and a specific capacity of 658 mA$\cdot$h$\cdot $g-1 at a current density of 100 mA/g for 100 cycles.
Key words： metal-organic framework compounds; MnO2; ZnO/C; lithium ion batteries
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