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Natural Polymers as Green Binders for High-Loading Supercapacitor Electrodes.
ChemSusChem ( IF 8.4 ) Pub Date : 2020-01-21 , DOI: 10.1002/cssc.201902863
Peter Ruschhaupt 1, 2 , Alberto Varzi 1, 2 , Stefano Passerini 1, 2
Affiliation  

The state-of-the-art aqueous binder for supercapacitors is carboxymethyl cellulose (CMC). However, it limits the mass loading of the coatings owing to shrinkage upon drying. In this work, natural polymers, that is, guar gum (GG), wheat starch (WS), and potato starch (PS), were studied as alternatives. The flexibility and adhesion of the resulting coatings and electrochemical performance was tested. The combination of 75:25 (w/w) ratio PS/GG showed a promising performance. Electrodes were characterized by SEM, thermal, adhesion, and bending tests. Their electrochemical properties were determined by cyclic voltammetry, electrochemical impedance spectroscopy, and cycling experiments. The PS/GG mixture conformed well to criteria for industrial production, enabling mass loadings higher than CMC (7.0 mg cm-2 ) while granting the same specific capacitance (26 F g-1 ) and power performance (20 F g-1 at 10 A g-1 ). Including the mass of the current collector, this represents a +45 % increase in specific energy at the electrode level.

中文翻译:

天然聚合物作为高负荷超级电容器电极的绿色粘合剂。

超级电容器的最新水性粘合剂是羧甲基纤维素(CMC)。然而,由于干燥时的收缩,它限制了涂层的质量负载。在这项工作中,研究了天然聚合物,即瓜尔豆胶(GG),小麦淀粉(WS)和马铃薯淀粉(PS)作为替代品。测试了所得涂层的柔韧性和粘合性以及电化学性能。PS / GG比例为75:25(w / w)的组合显示出令人鼓舞的性能。通过SEM,热,粘合和弯曲测试对电极进行表征。通过循环伏安法,电化学阻抗谱和循环实验确定它们的电化学性质。PS / GG混合物非常符合工业生产标准,因此可实现比CMC更高的质量负载(7。0 mg cm-2),同时具有相同的比电容(26 F g-1)和功率性能(10 A g-1时为20 F g-1)。包括集电器的质量,这表示电极级的比能增加了+ 45%。
更新日期:2020-01-23
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