Selenium Embedded in Metal-Organic Framework Derived Hollow Hierarchical Porous Carbon Spheres for Advanced Lithium-Selenium Batteries

作者：Liu, Ting; Dai, Chunlong; Jia, Min; Liu, Dingyu; Bao, ShuJuan; Jiang, Jian; Xu, Maowen^*; Li, Chang Ming

来源：ACS Applied Materials & Interfaces, 2016, 8(25): 16063-16070.

DOI：10.1021/acsami.6b04060

• hierarchical porous structure
• carbonate-based electrolyte
• cathode material
• polyselenides
• Li-Se batteries

Metal-organic framework derived hollow hierarchical porous carbon spheres (MHPCS) have been fabricated via a facile hydrothermal method combined with a subsequent annealing treatment. Such MHPCS are composed of masses of small hollow carbon bubbles with a size of similar to 20 nm and shells of nm thickness interconnected to each other. MHPCS/Se composite is developed as a cathode for Li-Se cells and delivers an initial specific capacity up to 588.2 mA h g(-1) at a current density of 0.5 C, exhibiting an outstanding cycling stability over 500 cycles with a decay rate even down to 0.08% per cycle. This material is capable of retaining up to 200 mA h g(-1) even after 1000 cycles at a current density of 1 C. Such good electrochemical performance may be ascribed to the distinct hollow structure of the carbon spheres and a large amount of Se wrapped within small carbon bubbles, thus not only enhancing the electronic/ionic transport but also providing additional buffer space to adjust volume changes of Se during charge/discharge processes.

• 出版日期2016-6-29
• 单位西南大学