Pore-making ionic liquid drived carbon as polar mixture for carbon/sulfur composite cathodes.

Autor: Wang, Zhijin, JuanjuanCheng, Song, Hongjia, Zhong, Xiangli, Wang, Jinbin, Cong, Peitian, Zhang, Deyu, Guo, Hongxia
Zdroj: Ionics; Jun2020, Vol. 26 Issue 6, p2949-2957, 9p
Abstrakt: Although the lithium-sulfur battery has a high theoretical specific capacity (1675 mAh g−1), its actual capacity is low, and the cycle stability is poor, because the active material undergoes the polarity and the nonpolarity transformation in the battery discharge/charge reaction. There are obvious limitations of using single polar or nonpolar binding, and it is needed to effectively combine the polar materials to the nonpolar matrix/sulfur. Here, we mechanically mixed 1-ethyl-3-methylimidazolium dicyanamide (Emim-dca)-based pore-making polar carbon (P-ILC) with nonpolar cotton carbon activated by KOH/sulfur (CKOH/S) to study the influence of the polar mixture on specific capacity and cycle stability of the battery. Comparing with the nonpolar cathode, the nonpolar-polar cathode has better electrochemical performance. The CKOH/S cathode with polar mixture of P-ILC shows a higher specific capacity (500 mAh g−1 at 100th 1C) and cyclic stability (average attenuation 0.34%). It is because the P-ILC+CKOH/S effectively combines the nonpolar physical binding and polar chemical anchoring by using the method of zonal binding of active materials. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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