纳米二氧化硅改性PVAPB水凝胶电解质及其在超级电容器中的应用

doi:10.19799/j.cnki.2095-4239.2020.0173

储能科学与技术 ›› 2020, Vol. 9 ›› Issue (6): 1651-1656.doi: 10.19799/j.cnki.2095-4239.2020.0173

纳米二氧化硅改性PVAPB水凝胶电解质及其在超级电容器中的应用

杨　晨(), 齐世凯, 姜猛进()

四川大学高分子科学与工程学院，四川成都 610065

收稿日期:2020-05-12 修回日期:2020-06-18 出版日期:2020-11-05 发布日期:2020-10-28
通讯作者: 姜猛进 E-mail:yangchen629@qq.com;memoggy@126.com
作者简介:杨晨（1995—），男，硕士研究生，主要研究方向为高性能水系超级电容器，E-mail：yangchen629@qq.com；
基金资助:
四川省重点研发项目(2020YFG0127)

Nano-silica modified polyvinyl alcohol potassium borate hydrogel electrolyte and its application in supercapacitors

Chen YANG(), Shikai QI, Mengjin JIANG()

College of Polymer Science & Engineering, Sichuan University, Chengdu 610065, Sichuan, China

Received:2020-05-12 Revised:2020-06-18 Online:2020-11-05 Published:2020-10-28
Contact: Mengjin JIANG E-mail:yangchen629@qq.com;memoggy@126.com

摘要/Abstract

摘要：

采用纳米二氧化硅(SiO₂)对原位电沉积所制备的聚乙烯醇硼酸钾(PVAPB)水凝胶电解质(HPE)进行掺杂改性，并对掺杂前后的电解质进行结构、形貌、热性能以及电导率进行分析。结果显示掺杂前后电解质都具有稳定的化学结构，SiO₂的加入会增加HPE的盐含量，促进离子的解离和运动。改性后的PVAPB HPE离子电导率达到了1.59 mS/cm。由SiO₂改性PVAPB HPE组装的超级电容器在1.0 A/g的电流密度下具有75.6 F/g的比容量，且时间常数为33.3 s。相比于未改性的超级电容器的容量提高了13.5%，时间常数缩短了一半。同时，使用SiO₂掺杂改性HPE的超级电容器也体现出优异的倍率性能。

关键词: 纳米二氧化硅, 聚乙烯醇硼酸钾, 电沉积, 水凝胶电解质, 超级电容器

Abstract:

In this study, nanoscale silicon dioxide (SiO₂) is used to modify the polyvinyl alcohol potassium borate (PVAPB) hydrogel polymer electrolyte (HPE) prepared by electrodeposition. The structure, morphology, thermal properties, and conductivity of the PVAPB HPE with or without SiO₂ are analyzed. Consequently, the results demonstrate that the two kinds of electrolytes both have a stable chemical structure. Moreover, adding SiO₂ increases the salt content of the electrolyte and promotes ion dissociation and movement. The ionic conductivity of the SiO₂-modified electrolyte reaches 1.59 mS/cm. The supercapacitor (SC) assembled by the PVAPB HPE modified with SiO₂ has 75.6 F/g capacitance at 1.0 A/g current density and 33.3 s time constant. Compared with the unmodified SC, the capacitance of the SC with SiO₂ increases by 13.5%, and the time constant shortens by half. On the contrary, the SC modified with SiO₂ exhibits an excellent performance rate.

Key words: nano-silica, polyvinyl alcohol potassium borate, electrodeposition, hydrogel electrolyte, supercapacitor

中图分类号:

TM 53

杨　晨, 齐世凯, 姜猛进. 纳米二氧化硅改性PVAPB水凝胶电解质及其在超级电容器中的应用[J]. 储能科学与技术, 2020, 9(6): 1651-1656.

Chen YANG, Shikai QI, Mengjin JIANG. Nano-silica modified polyvinyl alcohol potassium borate hydrogel electrolyte and its application in supercapacitors[J]. Energy Storage Science and Technology, 2020, 9(6): 1651-1656.

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参考文献 15

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SiO₂掺杂比例/%	本体电阻R_b/Ω	界面转移电阻R_ct/Ω	离子电导率σ/mS·cm^-1
0	1.51	0.35	1.34
0.5	1.48	0.60	1.37
1.0	1.28	0.20	1.59
1.5	1.57	0.22	1.29
2.0	1.98	0.56	1.03

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纳米二氧化硅改性PVAPB水凝胶电解质及其在超级电容器中的应用

Nano-silica modified polyvinyl alcohol potassium borate hydrogel electrolyte and its application in supercapacitors

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