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首页> 外文期刊>ACS applied materials & interfaces >Thiuram Vulcanization Accelerators as Polysulfide Scavengers To Suppress Shuttle Effects for High-Performance Lithium-Sulfur Batteries
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Thiuram Vulcanization Accelerators as Polysulfide Scavengers To Suppress Shuttle Effects for High-Performance Lithium-Sulfur Batteries

机译：Thiuram硫化促进剂作为多硫化物清除剂，以抑制高性能锂硫电池的梭效果

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摘要

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.
机译：锂 - 硫（LI-S）电池被认为是下一代高能量密度存储系统最有前途的替代品之一。尽管如此，臭名昭着的“班效”和实际操作中的动力转换严重严重妨碍了其实际应用。这里，受硫化促进剂的作用机理的启发，二亚甲基硫脲四硫化物（DPTT）用作新型电解质添加剂。就像一种清除剂，DPTT通过它们之间的自发瞬发的化学反应扫过多硫化物，并且后者迅速转化为Li2S2，以及元素S的产生，这将再次降低到多硫化物。这有利于缓解电解质中多硫化物的积累和血液。因此，Li-S电池具有含有DPTT的电解质的增强容量保持和提高速率性能。含有4wt％dptt添加剂和3.03mg cm（-2）次加载，电池在0.5 c时250次循环后提供1227.6 mA hg（-1）的高初始容量，优异的914.7 mA hg（-1）的容量保留。本研究提供了新的洞察力，抑制了梭效果并实现了高性能LI-S电池。

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