Polyamidoamine dendrimer-based binders for high-loading lithium-sulfur battery cathodes
Polyamidoamine dendrimer-based binders for high-loading lithium-sulfur battery cathodes
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DOI：
10.1016/j.nanoen.2015.11.012
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发表时间：
2016-01-01
期刊：
影响因子：
17.6
通讯作者：
Xiao, Jie
中科院分区：
文献类型：
--
作者：
Bhattacharya, Priyanka;Nandasiri, Manjula I.;Xiao, Jie
锂硫电池（li -硫电池）被认为是下一代储能最有前途的候选者之一。然而，要实现它们的实际应用，高S活性材料负载是必不可少的。因此，用于阴极的粘结材料至关重要，因为这是活性材料(S)和电子导电支架(C)之间键合相互作用的关键决定因素，也是电极材料和集流器之间保持密切接触的关键决定因素。本文研究了聚酰胺胺（PAMAM）树状大分子作为功能粘结剂在锂硫电池中的应用。利用PAMAM树状大分子的高表面功能，内部孔隙率和极性，证明了使用简单的加工方法可以很容易地实现高S负载（>4 mg cm(-2)）。与传统的线性聚合物粘合剂（如羧甲基纤维素（CMC）和丁苯橡胶（SBR））相比，阴极具有优异的电化学循环性能，这归功于树状大分子与C/S复合材料之间更好的界面相互作用，以及由于树状大分子球形、多孔结构而具有更好的电解质润湿性。此外，树突基粘合剂还可以物理和化学捕获极性多硫化物，从而证明了这种新型纳米粘合剂结构的重要实用性。(C) 2015 Elsevier Ltd.版权所有。
Lithium-sulfur (Li-S) batteries are regarded as one of the most promising candidates for next generation energy storage. To realize their practical application, however, a high S active material loading is essential. The binder material used for the cathode is therefore crucial as this is a key determinant of the bonding interactions between the active material (S) and electronic conducting support (C), as well as the maintenance of intimate contact between the electrode materials and current collector.Here, we investigated the application of polyamidoamine (PAMAM) dendrimers as functional binders in Li-S batteries. Utilizing the high degree of surface functionalities, interior porosities, and polarity of the PAMAM dendrimers, it is demonstrated that high S loadings (>4 mg cm(-2)) can be easily achieved using simple processing methods. An exceptional electrochemical cycling performance was obtained as compared to cathodes with conventional linear polymeric binders such as carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR), which was attributed to better interfacial interactions between the dendrimers and the C/S composite materials, as well as better electrolyte wetting due to the dendrimer spherical molecular, porous architectures. Furthermore, the dendrimer-based binders also physically and chemically trapped the polar polysulfides, thus demonstrating the significant utility of this new nanosized binder architecture. (C) 2015 Elsevier Ltd. All rights reserved.