Mixed-Metal鈥揙rganic Framework with Effective Lewis Acidic Sites for Sulfur Confinement in High-Performance Lithium鈥揝ulfur Batteries

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• 作者：Ziqi Wang ; Buxue Wang ; Yu Yang ; Yuanjing Cui ; Zhiyu Wang ; Banglin Chen ; Guodong Qian
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 23, 2015
• 年：2015
• 卷：7
• 期：37
• 页码：20999-21004
• 全文大小：419K
• ISSN：1944-8252

文摘

The mixed-metal鈥搊rganic framework approach and a representative zirconium鈥搈etalloporphyrin framework (MOF-525) have been developed to create novel sulfur hosts and Li鈥揝 batteries. The different local environments at the centers of the porphyrin moieties in a series of MMOFs鈥擬OF-525(2H), MOF-525(FeCl), and MOF-525(Cu)鈥攈ave led to their different behaviors for the confinement of sulfur and thus Li鈥揝 batteries. The unique structure of MOF-525(Cu) has enabled each Cu²⁺ site to offer two Lewis acidic sites, featuring it as a very powerful MOF host for the inclusion of sulfur and polysulfides. The S@MOF-525(Cu) cathode has demonstrated the best performance among all reported sulfur/MOFs composite cathode materials, with a reversible capacity of about 700 mAh/g at 0.5 C after 200 cycles.