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Building Hierarchical Microcubes Composed of One‐Dimensional CoSe 2 @Nitrogen‐Doped Carbon for Superior Sodium Ion Batteries
Author(s) -
Liu Tiezhong,
Li Youpeng,
Hou Shuang,
Yang Chenghao,
Guo Yayun,
Tian Sheng,
Zhao Lingzhi
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202000072
Subject(s) - anode , carbon fibers , materials science , sodium , composite number , doping , prussian blue , nanotechnology , nitrogen , ion , chemical engineering , electrode , electrochemistry , chemistry , composite material , optoelectronics , metallurgy , organic chemistry , engineering
Designing and synthesizing highly stable anode materials with high capacity is critical for the practical application of sodium ion batteries (SIBs), however, to date, this remains an insurmountable barrier. The introduction of hierarchical architectures and carbon supports is proving an effective strategy for addressing these challenges. Thus, we have fabricated a hierarchical CoSe 2 @nitrogen‐doped carbon (CoSe 2 @NC) microcube composite using the Prussian blue analogue Co 3 [Co(CN) 6 ] 2 as template. The rational combination of the unique hierarchical construction from one to three dimensions and a nitrogen‐doped carbon skeleton facilitates sodium ion and electron transport as well as stabilizing the host structure during repeated discharge/charge processes, which contributes to its excellent sodium storage capability. As expected, the as‐prepared CoSe 2 @NC composite delivered remarkable reversible capacity and ultralong cycling lifespan even at a high rate of 2.0 A g −1 (384.3 mA h g −1 after1800 loops) when serving as the anode material for SIBs. This work shows the great potential of the CoSe 2 ‐based anode for practical application in SIBs, and the original strategy may be extended to other anode materials.