期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 5, 期 6, 页码 5039-5048出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b00430
关键词
Carbon-coated nanomaterial; Iron sulfide; Metal-organic framework; One-pot templated synthesis; Lithium-ion storage
资金
- Shandong Provincial Natural Science Foundation [ZR2013EMQ012]
- Shandong Provincial Science and Technology Major Project [2015ZDZX11008]
- 1000 Talent Plan program [31270086963030]
- Fundamental Research Funds of Shandong University [2016JC005]
- Danish Council for Independent Research Technology and Production Sciences [DEF-1335-00330]
- Danish Agency for Science, Technology and Innovation for the International Network Programme [4070-00131B]
- Danish Agency for Science, Technology and Innovation
- Danish Council for Independent Research DFF-FTP for a graphene-material based project [12-127447]
- Chinese Scholarship Council (Ph.D. scholarship) [201406170040]
We report the design and nanoengineering of carbon-film-coated iron sulfide nanorods (C@Fe7S8) as an advanced conversion-type lithium-ion storage material. The structural advantages of the iron-based metal-organic framework (MIL-88-Fe) as both a sacrificed template and a precursor are explored to prepare carbon-encapsulated ploy iron sulfide through solid-state chemical sulfurizing. The resulting core-shell nanorods consisting of approximately 13% carbon and 87% Fe7S8 have a hierarchically porous structure and a very high specific surface area of 277 m(2) g(-1). When tested for use in fabrication of a redox conversion-type lithium-ion battery, this composite material has demonstrated high lithium-ion storage capacity at 1148 mA h g(-1) under the current rate of 500 mA g(-1) for 170 cycles and an impressive rate-retention capability at 657 mA h g(-1) with a current density of 2000 mA On the basis of systematic structural analysis and microscopic mapping, we discuss the charge-discharge mechanisms and the crucial factors associated with the stability and structural changes upon charge-discharge cycling.
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