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

doi:10.19799/j.cnki.2095-4239.2020.0173

Abstract

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

CLC Number:

TM 53

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.

Figures/Tables 9

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Table 1

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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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