期刊
ACS APPLIED MATERIALS & INTERFACES
卷 4, 期 8, 页码 4246-4250出版社
AMER CHEMICAL SOC
DOI: 10.1021/am300951f
关键词
cobalt sulfides; solid-state assembly; polyhedrons; electrode materials; lithium ion batteries; cycling stability
资金
- National 973 and 863 Program of China [2009CB939903, 2011AA050505]
- National Science and Technology Major Project [2011ZX02707]
- NSF of China [21101164, 20901083, 91122034, 50821004, 51125006, 51102263]
- NSF of Shanghai [11ZR1441900]
- Science and Technology Commission of Shanghai [10520706700, 10JC1415800]
The polyhedral CoS2 with a narrow size distribution was synthesized by a facile solid-state assembly process in a sealed silica tube. The flux of potassium halide (KK; X = Cl, Br, I) plays a crucial role in the formation of polyhedrons and the size distribution. The S-2(2-) groups in CoS2 can be controllably withdrawn during heat treatment in air. The obtained phases and microstructures of CoS2, Co3S4, CoS, Co9S8, and CoO depended on heating temperature and time. These cobalt materials, successfully used as the electrodes of lithium ion batteries, possessed good cycling stability in lithium ion batteries. The discharge capacities of 929.1 and 835.2 mAh g(-1) were obtained for CoS2 and CoS respectively, and 76% and 71% of the capacities remained after 10 cycles. High capacities and good cycle performance make them promising candidates for lithium ion batteries. The approach combining solid-state assembly and heat treatment provides a simple and versatile way to prepare various metal chalcogeides for energy storage applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据