文献类型：期刊文献

英文题名：Built-In Catalysis in Confined Nanoreactors for High-Loading Li-S Batteries

作者：Wu, Qingping[1,3];Yao, Zhenguo[1,2];Zhou, Xuejun[1];Xu, Jun[3];Cao, Fahai[3];Li, Chilin[1,2]

机构：[1]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Peiformance Ceram & Superfine, Shanghai 201899, Peoples R China;[2]Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China;[3]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：14

期号：3

起止页码：3365

外文期刊名：ACS NANO

收录：;EI(收录号：20201508395298);WOS:【SCI-EXPANDED(收录号:WOS:000526301400069)】；

基金：This work was supported by National Key R&D Program of China (2016YFB0901600), National Natural Science Foundation of China (51772313, U1830113, 21975276, 51802334, and 51003028), Foundation for Youth Scholar of State Key Laboratory of High Performance Ceramics and Superfine Microstructures (SKL201805), Shanghai Science and Technology Committee (16DZ2270100), and PetroChina Innovation Foundation (2016D-5007-0211).

语种：英文

外文关键词：Li-S batteries; metal-organic frameworks; built-in catalysis; carbon hosts; confined nanoreactors

摘要：A cathode host with strong sulfur/polysulfide confinement and fast redox kinetics is a challenging demand for high-loading lithium-sulfur batteries. Recently, porous carbon hosts derived from metal-organic frameworks (MOFs) have attracted wide attention due to their unique spatial structure and customizable reaction sites. However, the loading and rate performance of Li-S cells are still restricted by the disordered pore distribution and surface catalysis in these hosts. Here, we propose a concept of built-in catalysis to accelerate lithium polysulfide (LiPSs) conversion in confined nanoreactors, i.e., laterally stacked ordered crevice pores encompassed by MoS2-decorated carbon thin layers. The functions of S-fixability and LiPS catalysis in these mesoporous cavity reactors benefit from the 2D interface contact between ultrathin catalytic MoS2 and conductive C pyrolyzed from AI-MOF. The integrated function of adsorption-catalysis-conversion endows the sulfur-infused c@mos(2) electrode with a high initial capacity of 1240 mAh g(-1) at 0.2 C, long life cycle stability of at least 1000 cycles at 2 C, and high rate endurance up to 20 C. This electrode also exhibits commercial potential in view of considerable capacity release and reversibility under high sulfur loading (6 mg cm(-2) and , similar to 80 wt %) and lean electrolyte (E/S ratio of 5 mu L mg(-1) ). This study provides a promising design solution of a catalysis-conduction 2D interface in a 3D skeleton for high-loading Li-S batteries.