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Micrometer‐Sized Porous Fe 2 N/C Bulk for High‐Areal‐Capacity and Stable Lithium Storage
Author(s) -
Liu Dongna,
Xu Xiaoming,
Tan Jian,
Zhu Jiexin,
Li Qi,
Luo Yanzhu,
Wu Peijie,
Zhang Xiao,
Han Chunhua,
Mai Liqiang
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201803572
Subject(s) - materials science , micrometer , anode , porosity , graphite , lithium (medication) , conductivity , area density , chemical engineering , electrical resistivity and conductivity , electrode , doping , carbon fibers , nanotechnology , cathode , analytical chemistry (journal) , composite material , optoelectronics , chemistry , composite number , chromatography , medicine , physics , electrical engineering , engineering , optics , endocrinology
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 Fe 2 N/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 Fe 2 N/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 Fe 2 N/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 .