Reconfigurable solid-state electrolytes for high performance flexible supercapacitor
Reconfigurable solid-state electrolytes for high performance flexible supercapacitor
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DOI：
10.1016/j.jpowsour.2019.05.065
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发表时间：
2019-08-31
影响因子：
9.2
通讯作者：
Jung, Yung Joon
中科院分区：
文献类型：
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作者：
Hong, Sanghyun;Kim, Hyehee;Jung, Yung Joon
为了实现高性能和柔性的超级电容器，有必要解决基本问题，包括固体电解质的低离子电导率和电极/电解质对的高界面电阻。在这里，我们提出了独特的固态电解质，通过集成高度工程化的纳米多孔聚乙烯醇（PVA）与超平垂直排列的单壁碳纳米管（VA-SWNT）。高度工程化的PVA纳米多孔膜是通过通用的冻融过程，然后通过水混溶性溶剂处理来制造的，以便在PVA内部产生高度受控的纳米/微米级孔。这种高度多孔的PVA膜充当可重构的电解质模板和隔膜，其中H3 PO 4水溶液或离子液体可以选择性地插入以用于柔性电子应用中的各种功率要求。我们开发的成孔工艺适用于直接集成高性能VA-SWNTs电极，因为它允许聚合物电解质有效渗透到纳米级管间空间中，从而使离子易于进入和更快地传输，以获得更高的功率容量。这种可重构电解质和纳米结构电极的独特实体在10，000次充电/放电循环后表现出高功率和能量密度以及出色的稳定性。
To realize high performance and a flexible supercapacitor, it is necessary to address the fundamental issues including low ionic conductivity of solid electrolytes and high interfacial resistance of electrode/electrolyte pairs. Here we present unique solid-state electrolytes by integrating highly engineered nano-porous polyvinyl alcohol (PVA) with super-flat vertically aligned single-walled carbon nanotubes (VA-SWNTs). Highly engineered PVA nano-porous films are fabricated by a generic freeze-thaw process followed by water-miscible solvent treatment in order to create highly controlled nano/microscale pores inside of PVA. Such highly porous PVA films act as both reconfigurable electrolyte template and separator where H3PO4 aqueous solution or ionic liquids can be selectively inserted for a variety of power requirements in flexible electronic applications. Our developed pore formation process is suitable for directly integrating high performance VA-SWNTs electrode as it allows the effective permeation of the polymer electrolyte into nanoscale inter-tube space enabling the easy access and faster transport of ions for higher power capability. This unique entity of reconfigurable electrolyte and nanostructured electrode demonstrates high power and energy densities and remarkable stability after 10,000 charge/discharge cycles.