期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 38, 页码 20428-20438出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta06180c
关键词
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资金
- CAS Interdisciplinary Innovation Team
- National Natural Science Foundation of China [21574043]
- National Key Basic Research Program of China [2013CB21801]
Rational fabrication and structure design of anode materials with high specific capacity and excellent cycling stability are of significant importance for the development of high-performance lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). In this paper, a zeolitic imidazolate framework-8 (ZIF-8) with a unique polyhedral morphology and large size (about 2 mm) was successfully synthesized through a facile co-precipitation method. After successive carbonization and sulfidation, ZnS nanoparticles decorated on nitrogen-doped porous carbon polyhedra (ZnS/NPC) were obtained. When applied as the anode material for LIBs, the ZnS/NPC hybrid displays the highest reversible specific capacity for ZnS-based electrodes reported so far (1067.4 mA h g(-1) at 0.1 A g(-1)z after 200 cycles), excellent rate capability (364.6 mA h g(-1) at 4 A g(-1)), and robust long-term cycling performance (856.8 mA h g(-1) at 1 A g(-1) after 1000 cycles). As for SIBs, the resultant ZnS/NPC also exhibits a desirable capacity of 370.6 mA h g(-1) after 100 cycles at 0.1 A g(-1) and 289.2 mA h g(-1) after 1000 cycles at 1 A g(-1.) Such superior lithium and sodium storage performances should be attributed to the distinctive structure advantages inherited from ZIF-8, where the Zn ions were in situ converted to ZnS with high reactivity upon electrochemical cycling and the organic linkers were pyrolyzed to nitrogen-doped porous carbon polyhedra to enhance the conductivity of the hybrid and keep the structure stability during cycling.
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