A novel type of one-dimensional organic selenium-containing fiber with superior performance for lithium-selenium and sodium-selenium batteries
Date
2014
Authors
Wang, H.
Li, S.
Chen, Z.
Liu, H.K.
Guo, Z.
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RSC Advances: an international journal to further the chemical sciences, 2014; 4(106):61673-61678
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Hongqiang Wang, Sha Li, Zhixin Chen, Hua Kun Liua and Zaiping Guo
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Abstract
A novel type of organic selenide fiber composed of carbonized polyacrylonitrile/selenium (CPAN/Se) has been synthesized by heating polyacrylonitrile–selenium (PAN–Se) fibers via the electrospinning technique at 600 °C. The Se molecules are confined by N-containing carbon ring structures in the form of energy-storing selenium side chains in the carbonized PAN matrix. This unique stable chemical structure with a conductive carbon skeleton connected to the selenium side chains and excellent mechanical stability can allow CPAN/Se composite cathodes to be charged and discharged in a low-cost carbonate-based electrolyte with excellent long cycle stability and quite good rate performance. The superior electrochemical performance of CPAN/Se electrodes is demonstrated in both lithium-ion and sodium-ion batteries, where they have delivered a high capacity of nearly 600 mA h g−1 for 500 cycles in lithium–selenium (Li–Se) batteries and 410 mA h g−1 for 300 cycles in sodium–selenium (Na–Se) batteries at 0.3 C, respectively.
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This journal is © The Royal Society of Chemistry 2014