C. Jiang#, L. Li#, Q. Jia, M. Tang, K. Fan, Y. Chen, C. Zhang, M. Mao, J. Ma, W. Hu, C. Wang*, In-Situ Synthesis of Organopolysulfides Enabling Spatial and Kinetic Co-Mediation of Sulfur Chemistry. ACS Nano 2022, 10.1021/acsnano.2c01390.

Abstract: Li-S batteries have been regarded as one of the most promising alternatives of the next-generation Li batteries. However, the dissolution and shuttle of lithium polysulfides lead to low cycle stability and low coulombic efficiency, which intensively hinder the practical application of Li-S batteries. Herein, we propose a strategy to simultaneously promote the redox kinetics and inhibit the shuttle of lithium polysulfides, through in-situ synthesis of insoluble organopolysulfides by adding a special additive. Attractively, the formed insoluble organopolysulfides in the form of nanoparticle aggregates are also capable of adsorbing un-converted lithium polysulfides and hence effectively spatially suppress the shuttle effect. Furthermore, the organopolysulfides served as active redox mediators, showing faster redox kinetics of S chemistry than that of lithium polysulfides. As a result, the Li-S batteries showed impressive capacity, improved rate performance and long cycling stability even under lean electrolyte and high sulfur loading.

原文链接：https://doi.org/10.1021/acsnano.2c01390