Selenium Embedded in Metal-Organic Framework Derived Hollow Hierarchical Porous Carbon Spheres for Advanced Lithium-Selenium 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 ∼20 nm and shells of ∼5 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.
Institute for Clean Energy & Advanced Materials, Southwest University , Chongqing 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Chongqing 400715, P.R. China.
Ting
T
Liu
Institute for Clean Energy & Advanced Materials, Southwest University , Chongqing 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Chongqing 400715, P.R. China.
Chunlong
C
Dai
Institute for Clean Energy & Advanced Materials, Southwest University , Chongqing 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Chongqing 400715, P.R. China.
Min
M
Jia
Institute for Clean Energy & Advanced Materials, Southwest University , Chongqing 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Chongqing 400715, P.R. China.
Dingyu
D
Liu
Institute for Clean Energy & Advanced Materials, Southwest University , Chongqing 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Chongqing 400715, P.R. China.
ShuJuan
S
Bao
Institute for Clean Energy & Advanced Materials, Southwest University , Chongqing 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Chongqing 400715, P.R. China.
Jian
J
Jiang
Institute for Clean Energy & Advanced Materials, Southwest University , Chongqing 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Chongqing 400715, P.R. China.
Maowen
M
Xu
Institute for Clean Energy & Advanced Materials, Southwest University , Chongqing 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Chongqing 400715, P.R. China.
Chang Ming
CM
Li
Li−Se batteries; carbonate-based electrolyte; cathode material; hierarchical porous structure; polyselenides