Vacuum Calcination Induced Conversion of Selenium/Carbon Wires to Tubes for High-Performance Sodium–Selenium Batteries
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › Not applicable › peer-review
Author(s)
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Detail(s)
Original language | English |
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Article number | 1706609 |
Journal / Publication | Advanced Functional Materials |
Volume | 28 |
Issue number | 8 |
Online published | 10 Jan 2018 |
Publication status | Published - 21 Feb 2018 |
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Abstract
A vacuum calcination approach is developed to fabricate selenium/carbon composites, which does not require intensive mixing and durable heating such as in commonly used melt-infusion methods of loading selenium into carbon hosts. Starting from carbon-coated selenium wires prepared via a wet-chemical reaction, selenium/carbon tubes are fabricated by a straightforward calcination process. The calcination is conducted in a confined space to reduce the insulating carbon shell under vacuum, and selenium melts but remains a constituting part of the composite. Paired with sodium metal anode, the resultant selenium/carbon tubes deliver a high reversible capacity of 601 and 509 mA h g−1 at 0.2 and 2 C normalized by the mass of selenium, which corresponds to energy and power densities of 860 and 667 Wh kg−1 at 193 and 1770 W kg−1, respectively. Such capacity and rate performance surpasses most typical cathode materials for lithium or sodium (ion) batteries, according to the comparative literature analysis. Moreover, the robust tubular-like hollow structure of the selenium/carbon composites ensures for impressive capacity retention of more than 90% after 1000 cycles at 20 C.
Research Area(s)
- selenium/carbon composites, sodium–selenium batteries, vacuum calcination, wire-to-tube conversion
Citation Format(s)
Vacuum Calcination Induced Conversion of Selenium/Carbon Wires to Tubes for High-Performance Sodium–Selenium Batteries. / Yang, Xuming; Wang, Hongkang; Yu, Denis Y. W.; Rogach, Andrey L.
In: Advanced Functional Materials, Vol. 28, No. 8, 1706609, 21.02.2018.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › Not applicable › peer-review