Optimizing Electrocatalysis and Domain Effects of Graphene on Li 2 S Cathodes for High-Efficient-Stable Li─S Batteries.

Autor: Zhang J; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.; Chongqing Innovation Center, Beijing Institute of Technology, Chongqing, 401120, China., Zhao B; School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China., Qian M; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.; Chongqing Innovation Center, Beijing Institute of Technology, Chongqing, 401120, China., Yu C; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.; Chongqing Innovation Center, Beijing Institute of Technology, Chongqing, 401120, China., Mao P; Analysis & Testing Center, Beijing Institute of Technology, Beijing, 100081, China., Xie J; School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China., Huang JQ; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.; Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081, China., Wu F; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.; Chongqing Innovation Center, Beijing Institute of Technology, Chongqing, 401120, China., Tan G; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.; Chongqing Innovation Center, Beijing Institute of Technology, Chongqing, 401120, China.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Dec 02, pp. e2409172. Date of Electronic Publication: 2024 Dec 02.
DOI: 10.1002/smll.202409172
Abstrakt: Reducing the initial activation barrier of Li 2 S is crucial for enhancing the coulomb efficiency and cycle life of Li─S batteries. Herein two Li 2 S-graphene cathode architectures are constructed and investigated the electrocatalytic and domain effects of two graphene on Li 2 S. Systematic studies reveal an unprecedented relevancy between Li 2 S activation and graphene electrocatalysis, as well as an intrinsic relationship between Li 2 S stability and the graphene domain. A dramatically reduced initial activation potential of 2.8 V is achieved via the S─C bonding electrocatalysis of Li 2 S-graphene structure, much lower than the initial activation potential of 3.68   V triggered by two-phase electrocatalysis of Li 2 S/graphene composite. Density functional theory calculations offer mechanism insights into the electrocatalytic effect of S─C bonding on reduced overpotential, and in situ NMR provides solid evidence for the confinement effect of core-shell structure on enhanced cyclability. Notably, a specially designed Li 2 S@graphene cathode with core-shell structure and S─C interactions exhibit both superior electrocatalytic activation and electrochemical reversibility, enabling Li─S battery promising electrochemical properties, including low charge-discharge overpotential, high specific capacity, and excellent cycling performance. More importantly, it demonstrates excellent chemical compatibility within various electrolytes. This study provides valuable theoretical insights for the development of high-performance Li 2 S-graphene cathode materials.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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