Preparation And Properties Of Flexible And High Conductive Cellulose Hybrid Paper For Supercapacitor

In recent years,because of its flexible supercapacitor energy storage efficiency,long cycle life,environmental-friendly,and the advantages of good implantation,more and more intense attention is paid and widely studied by researchers internally and internationally.But its energy storage performance is mainly influenced by electrode materials,and it is rich in cellulose from natural reserves;its prospect in the application of energy storage equipment is very attractive.So this thesis embarks from the preparation of flexible high conductive cellulose composite paper,and explores its performance when it is used as flexible super capacitor electrode materials,which are primarily investigated and applied to the feasibility of flexible equipment.At the same time,this thesis systematically studied the influence of different reaction conditions on the electrochemical performance of composite paper.The research content of this thesis mainly includes the following three parts:（1）In the composite membrane system of suction filter of PANI/CNF/GNP,CNF can not only enhance CNF/GNP composite membrane mechanical strength and flexibility,but also reduce the diameter of the PANI worm-like nanorods,and it improves the doping level of the PANI chain in-situ polymerization,thus improving the specific capacity of super capacitor.A maximum specific capacitance of 421.5 F/g is achieved for hybrid PANI films based on composite substrates with 20 wt% CNF loading at a current density of 1 A/g.Moreover,good rate capability and energy/power density balance are exhibited by the hybrid PANI films.All-solid-state supercapacitors assembled from the hybrid PANI films shows excellent electrochemical performance and capacitance retention under repeated bending over1000 cycles,due to mechanical flexibility of composite substrates with CNF as binders.（2）In PANI/GCP composite membrane system by spraying,the CP as a skeleton base,it provides PANI/GCP composite membrane with high mechanical strength and good flexibility.Secondly,by changing the metal spraying processing time,it controls the formation of PANI worm-like nanorods,and provides the higher conductivity of the basement,composite membrane on the ratio of charge and discharge performance.Again,through comparing the different acid doping,it changes the microstructure of PANI chain in-situ polymerization and doping level,indicating the composite membrane resistance and the performance of the ratio is an inverse relationship.In a result,the gold spraying treatment for 15 mins,hydrochloric acid doped PANI/GCP composite film shows excellent pseudocapacitance characteristics,high specific capacity（A maximum specific capacitance of 446.25 F/g at a current density of 1A/g）;good rate performance and cyclic performance（the capacitance rentention of69.8% after GCD 1000 cycles）.（3）In MnO₂/M-NCF/GCP composite membrane system by coating,the CP as a skeleton,base for MnO₂/M-NCF/GCP composite membrane provides a high mechanical strength and good flexible bending.Secondly,by changing the solution of the solute（sodium sulfate and sulfuric acid）,it regulates the MnO₂ on M-NCF/GCP composite membrane in-situ growth of microscopic morphology and crystal structure.In a result,the Sulfuric acid system of MnO₂/M-NCF/GCP composite film showed relatively higher specific capacity（A maximum specific capacitance of 667.5 F/g at a current density of 1 A/g）,and MnO₂/M-NCF/GCP composite membrane by sodium sulfate has relatively better performance and cycle stability（more capacitance rentention of 10% after GCD 1000 cycles）.