氧化还原
电化学
分离器(采油)
纳米-
动力学
锂(药物)
硫黄
材料科学
化学
化学工程
无机化学
电极
冶金
物理化学
复合材料
医学
物理
量子力学
工程类
热力学
内分泌学
作者
Danhui Yi,Li Chang,Ben Zhou,Yitian Ma,Yuhao Wu,Peipei Wang,Zhaoqi Hou,Huiling Du,Hai Lu
标识
DOI:10.1002/cnma.202300633
摘要
The “shuttle effect” and sluggish conversion reaction kinetics of polysulfides seriously hinder the practical application of Li‐S batteries. In this study, nano‐sized LaMnO3 (N‐LMO) with typical perovskite structure combined with highly‐conductive carbon black (SP) was introduced on the commercial separator to fabricate a functional surface modification. It is found that the polar N‐LMO with abundant active sites offers strong chemisorption towards the soluble polysulfides meanwhile accelerates their redox conversion, and the conductive SP contributes to extra spots to reactivate the trapped sulfur species. Consequently, the synergistic effect of adsorption‐catalysis‐conduction built by the cooperative N‐LMO/SP modification greatly enhances the sulfur redox kinetics as well as suppresses the polysulfide shuttling not at the expense of weakening Li‐ion transport, which endows the Li‐S cell with a high initial discharge capacity of 1143.6 mAh g−1 at 0.2 C and a capacity decay rate of only 0.072% per cycle at 1 C over 500 cycles.
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