In this study,carboxymethyl cellulose(CMC)was used as the second network,which was cross-linked with polyvinyl alcohol(PVA)to successfully obtain a composite gel material with a PVA/CMC double network structure.The effects of CMC on the functional groups of PVA such as hydroxyl and vinyl were analyzed by using Fourier transform infrared spectroscopy,thermogravimetric analysis,electrochemical impedance spectroscopy and conductivity testing methods,confirming the formation of the cross-linked structures between CMC and PVA.The results show that the PVA/CMC composite material has a certain water content and stable thermal decomposition behavior,indicating that the introduction of CMC enhances the thermal stability of the composite material.In addition,the electrochemical impedance test shows that the introduction of CMC not only forms more ion transmission channels,but also reduces the barrier of ion migration,so that the ionic conductivity of the PVA/CMC composite material is increased from 0.53 S/m to 1.25 S/m,which is of great significance for improving the ionic conductivity of the electrolyte.These results show that PVA/CMC composite materials have potential superior performances in flexible electrolytes and provide useful inspirations for the developments of flexible energy storage devices.
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