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Facile Synthesis of Ultrasmall CoS 2 Nanoparticles within Thin N‐Doped Porous Carbon Shell for High Performance Lithium‐Ion Batteries
Author(s) -
Wang Qingfei,
Zou Ruqiang,
Xia Wei,
Ma Jin,
Qiu Bin,
Mahmood Asif,
Zhao Ruo,
Yang Yangyuchen,
Xia Dingguo,
Xu Qiang
Publication year - 2015
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.201403579
Subject(s) - materials science , anode , nanoparticle , lithium (medication) , chemical engineering , electrolyte , polysulfide , cobalt sulfide , carbon fibers , current density , dissolution , porosity , nanotechnology , composite number , electrode , electrochemistry , composite material , chemistry , physics , quantum mechanics , endocrinology , engineering , medicine
Cobalt sulfide (CoS 2 ) is considered one of the most promising alternative anode materials for high‐performance lithium‐ion batteries (LIBs) by virtue of its remarkable electrical conductivity, high theoretical capacity, and low cost. However, it suffers from a poor cycling stability and low rate capability because of its volume expansion and dissolution of the polysulfide intermediates in the organic electrolytes during the battery charge/discharge process. In this study, a novel porous carbon/CoS 2 composite is prepared by using nano metal–organic framework (MOF) templates for high‐preformance LIBs. The as‐made ultrasmall CoS 2 (15 nm) nanoparticles in N‐rich carbon exhibit promising lithium storage properties with negligible loss of capacity at high charge/discharge rate. At a current density of 100 mA g −1 , a capacity of 560 mA h g −1 is maintained after 50 cycles. Even at a current density as high as 2500 mA g −1 , a reversible capacity of 410 mA h g −1 is obtained. The excellent and highly stable battery performance should be attributed to the synergism of the ultrasmall CoS 2 particles and the thin N‐rich porous carbon shells derieved from nanosized MOF precusors.