Facile Synthesis of Ultrasmall CoS2 Nanoparticles within Thin N‐Doped Porous Carbon Shell for High Performance Lithium‐Ion Batteries. Issue 21 (16th February 2015)

• Record Type: Journal Article
• Authors: Wang, Qingfei; Zou, Ruqiang; Xia, Wei; Ma, Jin; Qiu, Bin; Mahmood, Asif; Zhao, Ruo; Yang, Yangyuchen; Xia, Dingguo; Xu, Qiang
• Is Part Of: Small. Volume 11:Issue 21(2015)
• Page Start: 2511
• Page End: 2517
• Publication Date: 2015-02-16
• Subjects: Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201403579
• Languages: English
• ISSNs: 1613-6810

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Cobalt sulfide (CoS₂) 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/CoS₂ composite is prepared by using nano metal–organic framework (MOF) templates for high‐preformance LIBs. The as‐made ultrasmall CoS₂ (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 CoS₂ particles and the thin N‐rich porous carbon shells derieved from nanosized MOF precusors.</p> </abstract>