浙江大学王琦团队报道了液态有机硫化物对锂金属电池阴极界面动力学的加速作用。相关研究成果于2022年10月13日发表在《德国应用化学》。

针对锂硫电池中的穿梭效应和动力学滞后问题，人们做了大量的研究，但对硫阴极反应路径的调整研究甚少。

该文中，研究人员报告了一种用液体有机硫化物代替无机硫的策略，并在阴极和电解质之间构建了一种新型的液-液界面，有效地抑制了穿梭效应，并将固液-固转化反应简化为仅液-固过程，从而大大改善了反应动力学。Li|PTS半电池在0.5℃下表现出良好的循环稳定性，750次循环后容量保持率为64.9%。3.1 g高PTS负载Li|PTS袋电池最大容量为997 mAh，在100 mA电流下50次循环后保持初始容量的82.1%。

该项工作丰富了Li-S电池的反应机理，并为阴极设计中的相间化学发展提供了新的见解。

附：英文原文

Title: Acceleration of Cathode Interfacial Kinetics by Liquid Organosulfides in Lithium Metal Batteries

Author: Xucheng Lv, Qilong Yang, Xie Zhang, Jiahan Song, Wei Guo, Qi Wang

Issue&Volume: 2022-10-13

Abstract: Great efforts have been made to tackle the issues of the shuttle effect and kinetics hysteresis in lithium-sulfur (Li-S) battery, but few on tuning the reaction path of sulfur cathode. Herein, we report a strategy to replace inorganic sulfur with liquid organosulfide and construct a novel liquid-liquid interface between cathode and electrolyte, which effectively inhibits the shuttle effect and simplifies the solid-liquid-solid conversion reaction to only liquid-solid process, thus greatly improving the reaction kinetics. The Li|PTS half-cell exhibits excellent cycling stability at 0.5 C, with a capacity retention of 64.9% after 750 cycles. The Li|PTS pouch cell with a high PTS loading of 3.1 g delivers a maximum capacity of 997 mAh and maintains 82.1% of initial capacity after 50 cycles at the current of 100 mA. This work enriches the reaction mechanism of Li-S batteries and provides new insights for the development of interphase chemistry in the design of cathodes.

DOI: 10.1002/anie.202213160

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202213160