Journal
SMALL
Volume 11, Issue 21, Pages 2511-2517Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201403579
Keywords
cobalt sulfide; hybrid composites; lithium ion batteries; nanometal-organic frameworks; nanoparticles
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Funding
- National Natural Science Foundation of China [11175006, 51322205, 21371014]
- Ministry of Education Program for New Century Excellent Talents of China [NCET-11-0027]
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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.
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