In-situ temperature regulation of flexible supercapacitors by designing intelligent electrode with microencapsulated phase change materials
In-situ temperature regulation of flexible supercapacitors by designing intelligent electrode with microencapsulated phase change materials
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微胶囊相变材料智能电极设计对柔性超级电容器的原位温度调控
DOI：
10.1016/j.electacta.2019.135551
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发表时间：
2020-02
影响因子：
6.6
通讯作者：
Dazhu Chen
中科院分区：
文献类型：
--
作者：
Xiao-ying Xu;Jia-hua Liu;Xing Ouyang;Lifeng Cui;Jiao-ling Hong;Xiao Meng;Siyin Qin;Chen Liu;Jiaoning Tang;Dazhu Chen
摘要受益于可穿戴电子设备的不断更新，柔性超级电容器在储能设备中引起了广泛的关注。然而，在高操作温度下实现高电化学性能和循环稳定性方面仍然存在挑战。采用电化学共沉积法，将微胶囊相变材料合理植入碳纳米管（CNF）表面的三维多孔还原氧化石墨烯/聚苯胺（GP）骨架中，形成柔性全固态超级电容器的原位热管理体系。以CNF/GP/MPCMs为电极材料，PVA-H2SO 4为凝胶电解质，成功组装了柔性的全固态超级电容器。MPCM的加入有效地抑制了超级电容器的温度波动，提高了其在高温下的工作稳定性。与不含MPCM的对应物相比，含有MPCM的超级电容器显示出上级长期循环稳定性。此外，所制备的超级电容器能够承受各种角度的变形，并且在500次弯曲循环后保持94.1%的初始电容，表现出优异的机械性能。该研究为柔性高性能超级电容器搭建基于MPCM的温度调节机制提供了一条可行的途径。
Abstract Benefiting from the on-going update of wearable electrical devices, flexible supercapacitors have attracted extensive attention in energy storage devices. However, the challenge still exists in achieving high electrochemical performance and cycling stability at high operating temperatures. Herein, an innovative in-situ thermal management system by rationally implanting microencapsulated phase change materials (MPCMs) into three-dimensional porous reduced graphene oxide/polyaniline (GP) frameworks on the surface of carbon nanotube film (CNF) was developed for flexible all-solid-state supercapacitors via facile one-pot electrochemical co-deposition method. The flexible sandwich-shaped all-solid-state supercapacitors using hybrid CNF/GP/MPCMs as electrodes and PVA-H2SO4 as the gel electrolyte were successfully assembled. The incorporation of MPCMs effectively suppressed the temperature fluctuation of the supercapacitor and promoted its operation stability at high temperatures. The supercapacitor containing MPCMs showed superior long-term cyclic stability in comparison with the counterpart without MPCMs. Moreover, the as-prepared supercapacitor was capable of enduring deformations of various angles and maintained 94.1% of the initial capacitance after 500 bending cycles, manifesting excellent mechanical performance. The study paves a feasible way of facilely constructing temperature regulation mechanism based on MPCMs for flexible high-performance supercapacitors.
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影响因子：
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