Development Of All-solid-state Flexible Supercapacitor Based On Three-dimensional Micro-nano Structure Polypyrrole

The wearable electric devices are widely applied in various fields,which has rapidly promoted the rapid development of high-performance flexible energy storage devices.Compared with the traditional electrostatic capacitors,supercapacitors as the new energy storage devices have higher energy density and power density.But compared with the traditional energy storage devices,the rate performance of the flexible energy storage devices is still need to be improved.In order to optimize the comprehensive performance of flexible supercapacitors,a all-solid-state flexible supercapacitor based on 3D cross-linked micro-nano polypyrrole electrode and porous polyvinyl alcohol(PVA)solid electrolyte was designed and developed.The research content mainly includes the following aspects:Design electrode materials in 3D micro-nano structure.At present,the stability of most electrode materials is not high.This is mainly because the structure of the electrode material is in an aggregated granular structure.The electrolyte ions will continuously enter and exit the electrode material during the charging and discharging process,resulting in the continuous expansion and shrinkage of the conductive polymer,which destroys the stability to a certain extent.The electrode material in 3D micro-nano structure developed in this paper forms a more stable structural support,avoids the destruction of the structure,and improves the stability and conductivity of the material.Development PVA-H2SO4 porous solid electrolyte.Flexible supercapacitors require the use of all-solid or semi-solid electrolytes,however,generally,the ionic conductivity of solid electrolytes is much lower than that of aqueous electrolytes,which leads to a significant decrease in rate performance.In this paper,through the design of porous electrolyte,fastion/electron conduction channel is provided,and thereby improve electrical conductivity.Assemble supercapacitors by using 3D micro-nano-structured electrodes and porous solid electrolytes.The advantage of this structural is that it can provide a fast electron/ion transmission path to accelerate the dynamic characteristics of the interf-ace pseudocapacitance reaction,and the conductivity and rate performance are improved while showing excellent flexibility.