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3 D Porous CoS 2 Hexadecahedron Derived from MOC toward Ultrafast and Long‐Lifespan Lithium Storage
Author(s) -
Wang HanChi,
Cui Zheng,
Fan ChaoYing,
Liu SiYu,
Shi YanHong,
Wu XingLong,
Zhang JingPing
Publication year - 2018
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.201800217
Subject(s) - anode , materials science , electrolyte , electrode , current density , mesoporous material , lithium (medication) , porosity , chemical engineering , nanotechnology , composite material , chemistry , catalysis , organic chemistry , medicine , physics , quantum mechanics , engineering , endocrinology
A new hexadecahedron assembled by core–shell CoS 2 particles@N‐doped carbon (CoS 2 @NCH) is prepared successfully through the self‐templating method. The CoS 2 @NCH hybrid electrode delivers a high lithium‐storage capacity of 778 mA h g −1 after 1000 cycles at a high current density of 1 A g −1 , which is the longest cycle lifespan among the reported CoS 2 anode materials in lithium‐ion batteries. Furthermore, the CoS 2 @NCH hybrid electrode shows excellent rate capability with a discharge capacity of 220 mA h g −1 at an extremely high current density of 20 A g −1 , and a charge capacity of 649 mA h g −1 is restored upon returning the current density back to 2 A g −1 . The superior performance is attributed to the unique construction of CoS 2 @NCH. The N‐doped interconnected porous carbon shells form highly conductive skeletons for quick electron transfer and prevent the electrode from collapsing. Moreover, the porous characteristic of the materials plays a key role: as some effective channels, the mesopores on the porous carbon shells provide greater access for lithium, and the mesopores derived from the particle interspace enables the complete immersion of the electrodes in electrolyte, which alleviates the volume expansion and ensures the integrity of the electrode. In addition, the nanosized CoS 2 particles, which shorten the ion‐transport path and provide extra electroactive sites, also improve the reaction kinetics.