Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4766735 | Electrochimica Acta | 2017 | 8 Pages |
Abstract
Improving the reaction kinetics of cathode and preventing the dissolution of polysulfides are two of the key strategies of developing the high-performance lithium-sulfur (Li-S) batteries. Herein, we propose a multi-porous conductive architecture through bridging conductive TiN nanoparticle over the surface of CNT-S composite. The as-prepared TiN@CNT-S composite cathode delivers the superior initial specific capacity of 1269 mAh gâ1 at 0.05C and as high as 586 mAh gâ1 at 2C. The reversible capacity of the TiN@CNT-S composite cathode is about two times higher than the bare cathode without TiN conductive bridging at 1C over 400 cycles. A high areal capacity of 4.0 mAh cmâ2 was realized for the TiN@CNT-S composite cathode with a high areal sulfur loading of 5.4 mg cmâ2 at a current rate of 0.5C over 50 cycles. The enhancements in the electrochemical performances are mainly ascribed to the TiN bridged highly conductive structure; the formation of the strong chemical interaction of S-N-Ti bond for polysulfides trapping provided by the chemically polar TiN, which is verified by the ultraviolet visible (UV) spectra and X-ray photoelectron spectroscopy (XPS) analyses.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Jing Zhang, Caiyin You, Weihua Zhang, Jian Wang, Shaohua Guo, Rong Yang, Yunhua Xu,