期刊
SMALL
卷 15, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201803572
关键词
high-areal capacity; high tap density; micrometer-sized Fe2N/C bulk; stable lithium storage
类别
资金
- National Key Research and Development Program of China [2016YFA0202603]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- National Natural Science Foundation of China [51521001]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- Yellow Crane Talent (Science AMP
- Technology) Program of Wuhan City
- Fundamental Research Funds for the Central Universities [WUT: 2017IVA100, 2017IVA096, 2017III009, 2017III040]
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing [WUT: 2018-KF-7, 2018-ZD-1]
High-capacity anodes of lithium-ion batteries generally suffer from poor electrical conductivity, large volume variation, and low tap density caused by prepared nanostructures, which make it an obstacle to achieve both high-areal capacity and stable cycling performance for practical applications. Herein, micrometer-sized porous Fe2N/C bulk is prepared to tackle the aforementioned issues, and thus realize both high-areal capacity and stable cycling performance at high mass loading. The porous structure in Fe2N/C bulk is beneficial to alleviate the volumetric change. In addition, the N-doped carbon conducting networks with high electrical conductivity provide a fast charge transfer pathway. Meanwhile, the micrometer-sized Fe2N/C bulk exhibits a higher tap density than that of commercial graphite powder (1.03 g cm(-3)), which facilitates the preparation of thinner electrode at high mass loadings. As a result, a high-areal capacity of above 4.2 mA h cm(-2) at 0.45 mA cm(-2) is obtained at a high mass loading of 7.0 mg cm(-2) for LIBs, which still maintains at 2.59 mA h cm(-2) after 200 cycles with a capacity retention of 98.8% at 0.89 mA cm(-2).
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