Thiuram Vulcanization Accelerators as Polysulfide Scavengers To Suppress Shuttle Effects for High-Performance Lithium–Sulfur Batteries,ACS Applied Materials & Interfaces

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Thiuram Vulcanization Accelerators as Polysulfide Scavengers To Suppress Shuttle Effects for High-Performance Lithium–Sulfur Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-07-31 00:00:00 , DOI: 10.1021/acsami.9b09546
Qian Xiang ₁ , Chenyang Shi ₁ , Xueya Zhang ₁ , Lin Zhang ₁ , Liang He ₁ , Bo Hong ₁ , Yanqing Lai ₁

Affiliation

Lithium–sulfur (Li–S) batteries are considered to be one of the most promising alternatives for next-generation high energy-density storage systems. Nevertheless, the notorious “shuttle effect” and sluggish kinetic conversion in actual operation seriously hamper its practical application. Herein, inspired by the action mechanism of vulcanization accelerators, dipentamethylenethiuram tetrasulfide (DPTT) is employed as a novel electrolyte additive. Just like a scavenger, DPTT sweeps lithium polysulfide by a spontaneous instant chemical reaction between them, and the latter is quickly converted to Li₂S₂, along with the generation of elemental S, which will be reduced to polysulfide again. This is beneficial for relieving the accumulation and shuttling of polysulfide in the electrolyte. Therefore, Li–S batteries with DPTT-containing electrolyte exhibit enhanced capacity retention and improved rate performance. With 4 wt % DPTT additive and 3.03 mg cm^–2 S loading, the cell delivers a high initial capacity of 1227.6 mA h g^–1 and excellent capacity retention of 914.7 mA h g^–1 after 250 cycles at 0.5 C. This study provides a fresh insight into suppressing the shuttle effect and realizing high-performance Li–S batteries.

中文翻译：

秋兰姆硫化促进剂作为多硫化物清除剂，可抑制高性能锂硫电池的穿梭效应

锂硫（Li–S）电池被认为是下一代高能量密度存储系统的最有希望的替代品之一。然而，在实际操作中臭名昭著的“穿梭效应”和缓慢的动力学转化严重地阻碍了其实际应用。在此，受硫化促进剂的作用机理的启发，将二亚甲基秋兰姆四硫化物（DPTT）用作新型电解质添加剂。就像清除剂一样，DPTT通过它们之间的自发即时化学反应清除多硫化锂，然后后者迅速转化为Li ₂ S _2。，以及元素S的生成，元素S会再次还原为多硫化物。这对于减轻电解质中多硫化物的积累和穿梭是有利的。因此，含DPTT电解液的Li–S电池具有更高的容量保持率和更高的倍率性能。用4重量％的添加剂DPTT和3.03毫克厘米^-2 ■装载，电池提供1227.6毫安Hg的高初始容量^-1和914.7毫安汞柱的优异的容量保持^-1之后，在0.5 C. 250次循环本研究提供了一个新鲜的抑制穿梭效应并实现高性能Li–S电池的见识。

更新日期：2019-07-31

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