Polycation Binders: An Effective Approach toward Lithium Polysulfide Sequestration in Li–S Batteries,ACS Energy Letters

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Polycation Binders: An Effective Approach toward Lithium Polysulfide Sequestration in Li–S Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-10-20 00:00:00 , DOI: 10.1021/acsenergylett.7b00779
Haiping Su _{1,

2} , Chengyin Fu ₂ , Yifan Zhao ₃ , Donghui Long ₁ , Licheng Ling ₁ , Bryan M. Wong _{2,

3} , Jun Lu ₄ , Juchen Guo _{2,

3}

Affiliation

Lithium polysulfide sequestration by polymeric binders in lithium–sulfur battery cathodes is investigated in this study. We prove polycations can effectively adsorb lithium polysulfides via Coulombic attraction between the positively charged backbone and the polysulfide anions. For the first time, we measure the simultaneous mass change of the sulfur cathodes with poly(diallyldimethylammonium triflate) (PDAT) and polyvinylpyrrolidone (PVP) binders during lithiation–delithiation using electrochemical quartz crystal microbalance (EQCM). The EQCM results demonstrate significantly higher mass gain with PDAT binder under identical conditions, providing direct evidence that PDAT is a superior binder. The advantage of polycation binders is also proved by charge–discharge cycling combined with ultraviolet–visible spectroscopy and X-ray photoelectron spectroscopy. With the PDAT binder and minimized electrolyte/sulfur weight ratio, we further demonstrate electrodes with high sulfur loading achieving 4.2 mAh cm^–2 areal capacity.

中文翻译：

聚阳离子粘合剂：锂硫电池中多硫化锂螯合的有效方法

在这项研究中，研究了聚合物粘合剂在锂硫电池正极中的多硫化锂螯合。我们证明，聚阳离子可以通过带正电的主链与多硫化物阴离子之间的库伦吸引作用有效地吸附多硫化锂。首次，我们使用电化学石英晶体微量天平（EQCM）在锂化-脱锂过程中测量了聚三氟甲磺酸二烯丙基二甲基铵（PDAT）和聚乙烯吡咯烷酮（PVP）粘合剂同时硫阴极的质量变化。EQCM结果表明，在相同条件下使用PDAT粘合剂可显着提高质量，这直接证明PDAT是一种优异的粘合剂。聚阳离子粘合剂的优势还通过充放电循环与紫外可见光谱和X射线光电子能谱相结合得到证明。使用PDAT粘合剂和最小化的电解质/硫的重量比，我们进一步证明了高硫负载的电极达到4.2 mAh cm^–2区域容量。

更新日期：2017-10-20

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