title: Facile Synthesis of Ultrasmall CoS2 Nanoparticles within Thin N-Doped Porous Carbon Shell for High Performance Lithium-Ion Batteries.
abstract: 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.
authors: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors: Qingfei
authors: Q
authors: Wang
authors: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors: Ruqiang
authors: R
authors: Zou
authors: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors: Wei
authors: W
authors: Xia
authors: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors: Jin
authors: J
authors: Ma
authors: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors: Bin
authors: B
authors: Qiu
authors: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors: Asif
authors: A
authors: Mahmood
authors: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors: Ruo
authors: R
authors: Zhao
authors: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors: Yangyuchen
authors: Y
authors: Yang
authors: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors: Dingguo
authors: D
authors: Xia
authors: National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka, 563-8577, Japan.
authors: Qiang
authors: Q
authors: Xu
keywords: cobalt sulfide; hybrid composites; lithium ion batteries; nanometal-organic frameworks; nanoparticles