Preparation And Electrochemical Properties Of Nanoscale Based Flexible Zinc Battery

Cellulose nanofibers,which are isolated from natural plants,have broad application prospects in energy storage devices.Water system batteries are widely concerned by researchers at home and abroad because of their simple preparation,environmental friendliness and good biocompatibility.Therefore,using cellulose nanofibers as the starting point,flexible composite paper and hydrogels were prepared,and the performance of the flexible battery electrode materials was explored,and the application capacity of their assembled cells was investigated.The research contents of this thesis include the following three parts.(1)In order to guarantee the flexible battery,the deposition zinc is selected as the battery electrode and the YISHION nanoscale membrane is used as diaphragm.In the different water system electrolyte,the deposition of zinc shows different electrochemical properties.In the mixed solution of ammonium chloride,zinc chloride and zinc sulfate,the deposition of zinc shows a good electrochemical cycle.Under the current density of 4A/g,the charge can be discharged for 1000 times,and the volume retention rate reaches 83.1%.(2)Electrodeposition of PANI on the prepared GNP/CNF composite film,the addition of CNF is not only good mixed with GNP,showing better mechanical strength,at the same time,it can induce a more rapid deposition and polymerization of PANI on the composite membrane,and make the composite membrane have better electrochemical properties,and select the CNF composite membrane of 50w% content,which can ensure that the composite membrane is sufficient.Electrical conductivity,electrodeposition of 15 min,that is,the capacity of 153mAh/g flexible zinc battery cathode.(3)Swelling of cellulose nanofibers provides abundant pore size in mixed hydrogels and enhances ionic diffusion of electrolytes into active materials.The optimum composition of cellulose cellulose nanofibers in mixed hydrogels is 50w% because of the balance between ion diffusion and electron transport by conductive graphite nanoscale.The aqueous zinc ion battery assembled from the optimized mixed hydrogel has a high specific capacity of 149.4mAh/g and an energy density of 113.2mW/g.In addition,the mixed hydrogel also ensures the high flexibility of the water based zinc ion battery.Under mechanical bending,the electrochemical performance is only a little attenuated.After the charging is completed,the LED bulb can be lit to show that the battery is practical.