Journal
SCIENCE CHINA-MATERIALS
Volume 58, Issue 2, Pages 91-97Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-015-0030-9
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Funding
- National Natural Science Foundation of China [51002057, 21271078, 21273087]
- Program for Changjiang Scholars and Innovatige Research Team in University
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Selenium attracts increasing attention as cathode material for rechargeable lithium batteries due to its high conductivity and comparable volumetric capacity with sulfur. Microporous carbon spheres (MiPCS) are synthesized via a hydrothermal-annealing route followed by activation with KOH. The MiPCS are used as matrix for Se loading to form Se/MiPCS composite. Such composite delivers a high specific capacity close to the theoretical value of Se. In carbonate-based electrolyte, the capacity is as high as 733 mAh g(-1) at a current density of 50 mA g(-1), and 353 mAh g(-1) at 5000 mA g(-1). At 0.5 C, the capacity retains up to 515 mAh g(-1) even after 100 cycles. Such outstanding electrochemical performance of the composite cathode in the carbonate electrolyte can be ascribed to the robust structure of MiPCS and to the solid-solid electrode process.
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