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CoS 2 Nanoparticles Embedded in Two‐Dimensional Sheet‐Shaped N‐Doped Carbon for Sodium Storage
Author(s) -
Zhang Chunyang,
Tan Pengfei,
Cheng Zhijie,
Song Jinbo,
Zhao Yuyuan,
Chen Lei,
Cai Xingwei,
Zhang Junhao,
Yuan Aihua
Publication year - 2021
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202100003
Subject(s) - anode , carbonization , chemistry , gravimetric analysis , nanoparticle , carbon fibers , electrochemistry , chemical engineering , nanotechnology , energy storage , doping , inorganic chemistry , electrode , materials science , organic chemistry , composite material , adsorption , optoelectronics , power (physics) , quantum mechanics , composite number , engineering , physics
Na‐ion batteries (NIBs) have attracted more and more attention due to the plentiful resources of sodium, excellent ion storage capacity and superior cycle life. However, the implementation of NIBs has been limited by the shortage of electrode materials with outstanding comprehensive properties. Among the discovered anode materials, transition metal sulfides (TMSs) have been widely considered as one of the most competitive and promising ones due to their high theoretical specific capacity. Herein, CoS 2 nanoparticles embedded in nitrogen‐doped carbon nanosheets (CoS 2 /NC) were designed and synthesized by using Co‐based Metal‐organic frame‐work (Co−MOF) as precursor of metal sulfurs, followed by a simple combined carbonization‐sulfurization process. The CoS 2 /NC compo‐sites were evaluated as binder‐free anode materials for NIBs, delivering a high reversible gravimetric capability of 332 mA h g −1 after 60 cycles as well as great rate capability of 326.6 mA h g −1 at 2000 mA g −1 . The improvement of electrochemical behavior is attributed to the synergistic interaction between CoS 2 nanoparticles with high electro‐chemical activity and the sheet‐shaped N‐doped carbon with high conductivity. This work provides a greatly attractive strategy for energy conversion and storage.