Electrochemical double-layer capacitors with lithium-ion electrolyte and electrode coatings with PEDOT:PSS binder
Electrochemical double-layer capacitors with lithium-ion electrolyte and electrode coatings with PEDOT:PSS binder
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DOI：
10.1007/s10800-020-01497-y
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发表时间：
2020-11-15
影响因子：
2.9
通讯作者：
Lekakou, Constantina
中科院分区：
文献类型：
--
作者：
Markoulidis, Foivos;Dawe, Adam;Lekakou, Constantina
尽管典型的电化学双层电容器（EDLC）使用针对活性炭电极优化的水性或无锂有机电解质操作，但人们对具有锂离子电解质的EDLC用于锂离子电容器和混合电池-超级电容器装置的应用感兴趣。我们提出了对称EDLC的实验研究，其具有在EC：EMC 50：50 v/v中的电解质IM LiPF 6和具有5重量% SBR或5或10重量%浓度的PEDOT：PSS粘合剂的电极涂层，其中对于含有PEDOT：PSS的电极，在锂离子电解质中研究了赝电容效应。探索了两种不同的电极涂层制备方法，刮刀涂布和喷涂。发现具有含任一粘合剂的电极的EDLC在锂离子电解质中具有0-2 V的稳定窗口。具有含10wt%PEDOT：PSS粘合剂的电极的EDLC产生具有赝电容特征的循环伏安图，该特征表明刮刀涂布的电极中的表面氧化还原赝电容，以及喷涂电极的嵌入和氧化还原现象。具有刮刀涂覆的电极和10重量% PEDOT：PSS粘合剂的EDLC在放电中表现出最高的能量密度，其将良好的电容特征与表面氧化还原赝电容相结合。通常，具有喷涂电极的EDLC比刮刀涂覆的电极达到更高的功率密度。
Although typical electrochemical double-layer capacitors (EDLCs) operate with aqueous or lithium-free organic electrolytes optimized for activated carbon electrodes, there is interest in EDLCs with lithium-ion electrolyte for applications of lithium ion capacitors and hybridized battery-supercapacitor devices. We present an experimental study of symmetric EDLCs with electrolyte 1 M LiPF6 in EC:EMC 50:50 v/v and electrode coatings with 5 wt% SBR or PEDOT:PSS binder at 5 or 10 wt% concentration, where for the PEDOT:PSS containing electrodes pseudocapacitance effects were investigated in the lithium-ion electrolyte. Two different electrode coating fabrication methods were explored, doctor blade coating and spraying. It was found that EDLCs with electrodes with either binder had a stability window of 0-2 V in the lithium-ion electrolyte. EDLCs with electrodes with 10 wt% PEDOT:PSS binder yielded cyclic voltammograms with pseudocapacitance features indicating surface redox pseudocapacitance in the doctor blade coated electrodes, and intercalation and redox phenomena for the sprayed electrodes. The highest energy density in discharge was exhibited by the EDLC with doctor blade-coated electrodes and 10 wt% PEDOT:PSS binder, which combined good capacitive features with surface redox pseudocapacitance. In general, EDLCs with sprayed electrodes reached higher power density than doctor blade coated electrodes.