An effective polysulfides bridgebuilder to enable long-life lithium-sulfur flow batteries
An effective polysulfides bridgebuilder to enable long-life lithium-sulfur flow batteries
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一种有效的多硫化物造桥剂，可实现长寿命的锂硫液流电池
DOI：
10.1016/j.nanoen.2018.06.044
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发表时间：
2018-09
期刊：
影响因子：
17.6
通讯作者：
Zhang Suojiang
中科院分区：
文献类型：
--
作者：
Xu Song;Cheng Yuanyuan;Zhang Lan;Zhang Kaihang;Huo Feng;Zhang Xiangping;Zhang Suojiang
多硫化物穿梭虽然不是唯一的问题，但绝对是阻碍锂硫电池商业化的最突出问题。在此，采用功能设计的SiO2束缚的1-甲基-1-丙基哌啶氯化物(SiO2-PCl)离子液体纳米粒子作为碳载体和多硫化锂(LPS)之间的架桥剂来调节穿梭问题。 SiO2-PPCl通过其特殊的官能团对极性LPS和非极性碳载体材料发挥有效的粘附作用，使其充当它们之间的桥梁，因此，有效地阻止溶解的LPS迁移到锂负极，并且通过简单地调节SiO2-PPCl与硫的比例来控制相应的LPS穿梭。该策略在锂硫悬浮液流电池中得到验证，由于采用大量电解液，穿梭效应更加严重，可实现超过1000次循环，库仑效率高达99%。经实验室流动电池设备验证，利用多硫化物架桥剂控制LPS穿梭的方法证明了其可行性，为锂硫电池的发展提供了新的方向。
Polysulfides shuttle, although is not the only one, but definitely the most prominent problem which hinders the commercialization of lithium-sulfur cells. Herein, a functionally designed SiO2tethered 1-methyl-1-propylpiperidinium chloride (SiO2-PPCl) ionic liquid nanoparticle is adopted as a bridgebuilder between the carbon carrier and lithium polysulfides (LPS) to modulate shuttle issues. The SiO2-PPCl exerts effective adhesion to both polar LPS and nonpolar carbon carrier material by its special function groups, which make it act as a bridge between them, therefore, the dissolved LPS are prevented from migrating to lithium anode effectively, and the corresponding LPS shuttle is controllable by simply tuning the ratio of SiO2-PPCl to sulfur. This strategy is demonstrated in a lithium sulfur suspension flow cell in which the shuttle effect is more serious because large quantity of electrolyte is adopted, and over 1000 cycles is achieved with high coulombic efficiency of 99%. Verified in a laboratory flow cell equipment, the approach of exploiting polysulfides bridgebuilder to control LPS shuttle manifests its feasibility and offers a new direction to develop lithium-sulfur batteries.
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DOI：
10.1039/c7ta02110k
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期刊：
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