| Affiliation: | 1. State Center for International Cooperation on Designer Low-carbon & Environmental Materials (CDLCEM), School of Materials Science and Engineering, 100 Kexue Avenue, Zhengzhou University, Zhengzhou, 450001 P. R. China
Zhengzhou Materials Genome Institute (ZMGI), Xingyang, Zhengzhou, 450100 P. R. China;2. State Center for International Cooperation on Designer Low-carbon & Environmental Materials (CDLCEM), School of Materials Science and Engineering, 100 Kexue Avenue, Zhengzhou University, Zhengzhou, 450001 P. R. China;3. State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan, 430070 P. R. China |
| Abstract: | The main obstacles for the commercial application of Lithium–Sulfur (Li–S) full batteries are the large volume change during charging/discharging process, the shuttle effect of lithium polysulfide (LiPS), sluggish redox kinetics, and the indisciplinable dendritic Li growth. Especially the overused of metal Li leads to the low utilization of active Li, which seriously drags down the actual energy density of Li–S batteries. Herein, an efficient design of dual-functional CoSe electrocatalyst encapsulated in carbon chain-mail (CoSe@CCM) is employed as the host both for the cathode and anode regulation simultaneously. The carbon chain-mail constituted by carbon encapsulated layer cross-linking with carbon nanofibers protects CoSe from the corrosion of chemical reaction environment, ensuring the high activity of CoSe during the long-term cycles. The Li–S full battery using this carbon chain-mail catalyst with a lower negative/positive electrode capacity ratio (N/P < 2) displays a high areal capacity of 9.68 mAh cm−2 over 150 cycles at a higher sulfur loading of 10.67 mg cm−2. Additionally, a pouch cell is stable for 80 cycles at a sulfur loading of 77.6 mg, showing the practicality feasibility of this design. |
